diff --git a/.github/workflows/studio-build.yml b/.github/workflows/studio-build.yml
index 150ed957d..2b241150f 100644
--- a/.github/workflows/studio-build.yml
+++ b/.github/workflows/studio-build.yml
@@ -110,7 +110,7 @@ jobs:
         with:
           deno-version: v2.x
 
-      - name: Setup Node.js (playground vite build)
+      - name: Setup Node.js (studio-ui vite build)
         uses: actions/setup-node@v6
         with:
           node-version: '24'
@@ -139,15 +139,15 @@ jobs:
         # `npm install` runs `prepare: svelte-kit sync` for each SvelteKit
         # package and generates `.svelte-kit/tsconfig.json`, which is what
         # `packages/ui/tsconfig.json` extends. `deno install` skips lifecycle
-        # scripts, so without an explicit sync step the playground vite build
+        # scripts, so without an explicit sync step the studio-ui vite build
         # fails with `failed to resolve "extends":"./.svelte-kit/tsconfig.json"`.
         shell: bash
         run: |
           cd packages/ui && npx svelte-kit sync
-          cd ../../tools/agent-playground && npx svelte-kit sync
+          cd ../../apps/studio-ui && npx svelte-kit sync
 
-      - name: Build playground static UI
-        working-directory: tools/agent-playground
+      - name: Build studio-ui static UI
+        working-directory: apps/studio-ui
         run: npm run build
 
       - name: Import Apple Developer ID certificate (macOS)
@@ -181,7 +181,7 @@ jobs:
           set -euo pipefail
           STAGING="dist/${{ matrix.target }}/staging"
           # Sign every Mach-O binary in staging with Hardened Runtime so
-          # notarization passes. atlas/link/playground/webhook-tunnel run JIT
+          # notarization passes. atlas/link/studio-ui/webhook-tunnel run JIT
           # (V8) so they need entitlements for unsigned-executable-memory.
           ENTITLEMENTS="$(mktemp -t entitlements.plist).plist"
           cat > "$ENTITLEMENTS" <<'PLIST'
@@ -211,7 +211,7 @@ jobs:
           for f in \
               "bin/friday" \
               "bin/link" \
-              "bin/playground" \
+              "bin/studio-ui" \
               "bin/webhook-tunnel" \
               "friday-launcher" \
               "bin/gh" \
diff --git a/.vscode/settings.json b/.vscode/settings.json
index b3d14b645..2458c2d67 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -5,8 +5,6 @@
   "[json]": { "editor.defaultFormatter": "biomejs.biome" },
   "[markdown]": { "editor.defaultFormatter": "denoland.vscode-deno" },
   "editor.codeActionsOnSave": { "source.organizeImports.biome": "explicit" },
-  "eslint.workingDirectories": [
-    { "directory": "tools/agent-playground", "changeProcessCWD": true }
-  ],
+  "eslint.workingDirectories": [{ "directory": "apps/studio-ui", "changeProcessCWD": true }],
   "eslint.validate": ["javascript", "typescript", "svelte"]
 }
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 65aa5c314..96b310189 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -21,7 +21,7 @@ version:
 
 ```bash
 # Deno + TypeScript (core platform)
-deno task dev:playground  # Daemon (auto-restart) + web playground + link + tunnel
+deno task dev:studio-ui   # Daemon (auto-restart) + Studio UI + link + tunnel
 deno task start           # Daemon only, no auto-restart
 deno task typecheck       # Type check (deno check + svelte-check)
 deno task lint            # Lint
diff --git a/Dockerfile b/Dockerfile
index 90e64e58b..565563154 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-# Friday Platform image: atlasd + link + agent-playground + webhook-tunnel
+# Friday Platform image: atlasd + link + studio-ui + webhook-tunnel
 #
 # Build:
 #   docker build -t friday-platform .
@@ -9,17 +9,17 @@
 # Ports:
 #   18080  atlasd (daemon API) - mapped to container port 8080
 #   13100  link (credential/auth service) - mapped to container port 3100
-#   15200  agent-playground (web UI) - mapped to container port 5200
+#   15200  studio-ui (web UI) - mapped to container port 5200
 #   19090  webhook-tunnel - mapped to container port 9090
 
 # ============================================================================
-# Stage 1: Deno builder — compile atlas/link binaries & prepare playground
+# Stage 1: Deno builder — compile atlas/link binaries & prepare studio-ui
 # ============================================================================
 FROM denoland/deno:debian-2.7.4 AS deno-builder
 
 WORKDIR /app
 
-# Need Node.js/npm for building @atlas/ui (svelte-package) and the playground.
+# Need Node.js/npm for building @atlas/ui (svelte-package) and studio-ui.
 RUN apt-get update && apt-get install -y --no-install-recommends \
     nodejs npm && \
     rm -rf /var/lib/apt/lists/*
@@ -30,7 +30,7 @@ COPY deno.json deno.lock package.json ./
 COPY apps/atlasd/deno.json apps/atlasd/package.json* ./apps/atlasd/
 COPY apps/atlas-cli/deno.json apps/atlas-cli/package.json* ./apps/atlas-cli/
 COPY apps/link/deno.json apps/link/package.json* ./apps/link/
-COPY tools/agent-playground/deno.json tools/agent-playground/package.json ./tools/agent-playground/
+COPY apps/studio-ui/deno.json apps/studio-ui/package.json ./apps/studio-ui/
 COPY tools/evals/deno.json tools/evals/package.json ./tools/evals/
 COPY packages/ ./packages/
 
@@ -40,12 +40,12 @@ RUN deno install
 # Copy full source (changes frequently but doesn't bust the install cache)
 COPY . .
 
-# Build @atlas/ui — the playground imports from dist/ which needs svelte-package
+# Build @atlas/ui — studio-ui imports from dist/ which needs svelte-package
 WORKDIR /app/packages/ui
 RUN npx svelte-kit sync && npx svelte-package -o dist
 
-# Generate .svelte-kit/tsconfig.json for the playground so vite doesn't warn
-WORKDIR /app/tools/agent-playground
+# Generate .svelte-kit/tsconfig.json for studio-ui so vite doesn't warn
+WORKDIR /app/apps/studio-ui
 RUN npx svelte-kit sync
 
 WORKDIR /app
@@ -178,9 +178,9 @@ COPY --from=go-builder   /out/webhook-tunnel    /usr/local/bin/webhook-tunnel
 WORKDIR /app
 
 # ── Copy runtime source for services that can't be compiled ──────────────────
-# agent-playground: Vite dev server needs source + node_modules
+# studio-ui: Vite dev server needs source + node_modules
 
-# Workspace config (Deno needs these to resolve imports for the playground)
+# Workspace config (Deno needs these to resolve imports for studio-ui)
 COPY --chown=atlas:atlas --from=deno-builder /app/deno.json /app/deno.lock /app/package.json /app/tsconfig.json /app/reset.d.ts /app/
 COPY --chown=atlas:atlas --from=deno-builder /app/types /app/types
 
@@ -190,7 +190,7 @@ COPY --chown=atlas:atlas --from=deno-builder /app/types /app/types
 RUN node -e " \
   const ws = [ \
     './packages/*', \
-    './tools/agent-playground' \
+    './apps/studio-ui' \
   ]; \
   for (const f of ['/app/deno.json', '/app/package.json']) { \
     const c = JSON.parse(require('fs').readFileSync(f, 'utf8')); \
@@ -199,19 +199,19 @@ RUN node -e " \
     require('fs').writeFileSync(f, JSON.stringify(c, null, 2) + '\n'); \
   }" && chown atlas:atlas /app/deno.json /app/package.json /app/deno.lock
 
-# Runtime tools (playground needs source + svelte-kit)
-COPY --chown=atlas:atlas --from=deno-builder /app/tools/agent-playground /app/tools/agent-playground
+# Runtime app source (studio-ui needs source + svelte-kit)
+COPY --chown=atlas:atlas --from=deno-builder /app/apps/studio-ui /app/apps/studio-ui
 
-# Shared packages (playground imports @atlas/ui etc.)
+# Shared packages (studio-ui imports @atlas/ui etc.)
 COPY --chown=atlas:atlas --from=deno-builder /app/packages /app/packages
 
 # Agent definitions
 COPY --chown=atlas:atlas --from=deno-builder /app/.agents /app/.agents
 
-# node_modules — only needed for the playground (vite, svelte)
+# node_modules — only needed for studio-ui (vite, svelte)
 COPY --chown=atlas:atlas --from=deno-builder /app/node_modules /app/node_modules
 
-# Deno cache — only what the playground needs at runtime.
+# Deno cache — only what studio-ui needs at runtime.
 # The compiled binaries (atlas, link, webhook-tunnel) are self-contained.
 COPY --chown=atlas:atlas --from=deno-builder /deno-dir /deno-dir
 # Fix /deno-dir top-level dir ownership (base image creates it as deno:deno,
diff --git a/NOTICE b/NOTICE
index 1436ce7b1..1e9a3b551 100644
--- a/NOTICE
+++ b/NOTICE
@@ -6,7 +6,7 @@ This product includes software developed by third parties.
 Friday Studio ships several artifacts, each of which bundles a different set of
 upstream dependencies:
 
-  - Atlas daemon, CLI, and web playground (Deno + npm + JSR packages)
+  - Atlas daemon, CLI, and Studio UI (Deno + npm + JSR packages)
   - Friday Launcher, pty-server, webhook-tunnel (Go modules)
   - Studio Installer (Rust crates via Cargo / Tauri)
 
diff --git a/README.md b/README.md
index 08b328c20..40463cbd6 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ their machine.
 
 Two surfaces, one runtime:
 
-- **Chat in the playground.** Friday picks up your installed skills, MCP
+- **Chat in Studio UI.** Friday picks up your installed skills, MCP
   servers, memory, and OAuth credentials, and actually drives your tools
   instead of describing what it would do.
 - **Run autonomously.** Capture the pattern in a `workspace.yml`, bind it
@@ -32,7 +32,7 @@ without wiring queues, secret stores, schedulers, MCP plumbing, and
 provider clients from scratch every time.
 
 > **Prefer the packaged version?** **[hellofriday.ai](https://hellofriday.ai)**
-> ships the same daemon and playground as a one-click installer for macOS
+> ships the same daemon and Studio UI as a one-click installer for macOS
 > with the launcher, dependencies, and tray UI bundled. The
 > rest of this README is for working in-tree.
 
@@ -41,10 +41,10 @@ provider clients from scratch every time.
 | | What it is | When you use it |
 | --- | --- | --- |
 | **`atlasd` (daemon)** | Headless runtime — HTTP API on `:8080`, workspace lifecycle, signal router, session state, JetStream message bus. | Production. CI. Anything you'd `systemd`-ify. |
-| **Agent Playground** | SvelteKit web UI on `:5200` — chat with Friday, author and run agents, inspect every session step-by-step, manage skills/MCP servers/schedules/memory/credentials, browse the workspace marketplace. | Day-to-day. The playground is what you actually look at. |
+| **Studio UI** | SvelteKit web UI on `:5200` — chat with Friday, author and run agents, inspect every session step-by-step, manage skills/MCP servers/schedules/memory/credentials, browse the workspace marketplace. | Day-to-day. Studio UI is what you actually look at. |
 
 The desktop installer ships both behind a tray icon. In-tree, `deno task
-dev:playground` runs both side by side with hot reload.
+dev:studio-ui` runs both side by side with hot reload.
 
 ## Quickstart
 
@@ -59,7 +59,7 @@ handles the rest.
 
 | Tool | Min | Why |
 | --- | --- | --- |
-| [Node.js](https://nodejs.org/) | `24+` | Playground runs under Vite via `npx`; `@atlas/ui` builds with `svelte-package`. Manage via fnm/volta/nvm — auto-installing system Node clobbers project pins. |
+| [Node.js](https://nodejs.org/) | `24+` | Studio UI runs under Vite via `npx`; `@atlas/ui` builds with `svelte-package`. Manage via fnm/volta/nvm — auto-installing system Node clobbers project pins. |
 | [git](https://git-scm.com/) | any recent | — |
 
 **`setup-dev-env.sh` handles these — installs if missing or below min, otherwise keeps yours:**
@@ -111,13 +111,13 @@ The example file documents every variable the daemon reads — provider keys,
 proxies, OAuth/GitHub App credentials, integration tokens. The minimum to
 run a real agent is one LLM provider key.
 
-### 3. Run the playground (recommended)
+### 3. Run Studio UI (recommended)
 
-One command, four processes — daemon, link, playground, and webhook tunnel —
+One command, four processes — daemon, link, Studio UI, and webhook tunnel —
 all with hot reload:
 
 ```bash
-deno task dev:playground
+deno task dev:studio-ui
 ```
 
 Open <http://localhost:5200> and the sidebar gives you everything: bundled
@@ -138,7 +138,7 @@ deno task atlas daemon stop
 
 ### Just chat with it
 
-Open the playground at <http://localhost:5200>. Type:
+Open Studio UI at <http://localhost:5200>. Type:
 
 > *Find every unread email from my team that's waiting on a reply, summarize what each is asking, and draft responses.*
 
@@ -218,9 +218,9 @@ Browse [`friday-studio-examples`](https://github.com/friday-platform/friday-stud
 for `github-digest`, `competitive-monitor`, `daily-operating-memo`,
 `jira-bugfix-bitbucket`, and others.
 
-## Agent Playground
+## Studio UI
 
-`deno task dev:playground` opens the playground at <http://localhost:5200>.
+`deno task dev:studio-ui` opens Studio UI at <http://localhost:5200>.
 It's the same Svelte app the desktop installer ships — production UI, not
 a debug widget.
 
@@ -253,8 +253,8 @@ deno task sim "..." --stop-at=fsm        # blueprint + FSM compile
 deno task sim "..." --real               # execute with real MCP agents
 ```
 
-Artifacts land in `runs/workspaces/<timestamp>-<slug>/` — replay them in the
-playground's **Workspaces / History** tab.
+Artifacts land in `runs/workspaces/<timestamp>-<slug>/` — replay them in
+Studio UI's **Workspaces / History** tab.
 
 ## Common commands
 
@@ -285,7 +285,7 @@ Want it all in containers?
 docker compose up
 ```
 
-Brings up the daemon, playground, link credential service, PTY server, and
+Brings up the daemon, Studio UI, link credential service, PTY server, and
 webhook tunnel. Ports default to `1xxxx` to avoid host collisions — see
 [`docker-compose.yml`](docker-compose.yml).
 
@@ -299,11 +299,11 @@ apps/
   ledger/             # Resource & activity storage service
   studio-installer/   # Tauri desktop app — tray, daemon supervisor,
                       # autostart. The hellofriday.ai download.
+  studio-ui/          # SvelteKit web UI — Studio UI (production frontend)
 packages/             # @atlas/* libraries — core, agent-sdk, config,
                       # fsm-engine, llm, logger, mcp, memory, skills,
                       # storage, workspace, signals, jetstream, …
 tools/
-  agent-playground/   # Web client (SvelteKit) — production UI
   evals/              # Agent eval harness
   friday-launcher/    # System tray launcher + daemon supervisor (Go)
   pty-server/         # WebSocket → PTY shell bridge (Go)
diff --git a/THIRD_PARTY_LICENSES.md b/THIRD_PARTY_LICENSES.md
index bd6654156..95c702e11 100644
--- a/THIRD_PARTY_LICENSES.md
+++ b/THIRD_PARTY_LICENSES.md
@@ -1,7 +1,7 @@
 # Third-Party Licenses
 
 This file lists every third-party dependency bundled into a shipped Friday
-Studio artifact (the daemon, CLI, web playground, Friday Launcher,
+Studio artifact (the daemon, CLI, Studio UI, Friday Launcher,
 webhook tunnel, and Studio Installer). It is generated automatically by
 [`scripts/generate-third-party-licenses.sh`](scripts/generate-third-party-licenses.sh).
 
@@ -834,7 +834,7 @@ Bundled into: `apps/studio-installer` (Tauri installer binary).
 
 ## npm / JSR packages
 
-Bundled into: the Atlas daemon, CLI, web playground, and any compiled
+Bundled into: the Atlas daemon, CLI, Studio UI, and any compiled
 Deno binaries. Inventory is taken from `deno.lock`.
 
 | Package | Version | Source |
diff --git a/apps/atlas-cli/src/cli/commands/agent/exec.ts b/apps/atlas-cli/src/cli/commands/agent/exec.ts
index f644e0694..58eb0ac68 100644
--- a/apps/atlas-cli/src/cli/commands/agent/exec.ts
+++ b/apps/atlas-cli/src/cli/commands/agent/exec.ts
@@ -3,7 +3,7 @@ import { parseSSEStream } from "@atlas/utils/sse";
 import { define } from "gunshi";
 import { errorOutput } from "../../../utils/output.ts";
 
-const DEFAULT_PLAYGROUND_URL = "http://localhost:5200";
+const DEFAULT_STUDIO_UI_URL = "http://localhost:5200";
 
 /**
  * Renders a single SSE event to stdout in human-readable format.
@@ -94,7 +94,7 @@ function parseEnvArgs(envArgs: string | undefined): Record<string, string> | und
 
 export const execCommand = define({
   name: "exec",
-  description: "Execute an agent via the playground and stream results",
+  description: "Execute an agent via Studio UI and stream results",
   args: {
     agent: { type: "positional", description: "Agent ID to execute", required: true },
     input: {
@@ -104,7 +104,7 @@ export const execCommand = define({
       required: true,
     },
     json: { type: "boolean", description: "Output raw SSE events as NDJSON", default: false },
-    url: { type: "string", description: `Playground URL (default: ${DEFAULT_PLAYGROUND_URL})` },
+    url: { type: "string", description: `Studio UI URL (default: ${DEFAULT_STUDIO_UI_URL})` },
     env: {
       type: "string",
       short: "e",
@@ -125,7 +125,7 @@ export const execCommand = define({
       process.exit(1);
     }
 
-    const playgroundUrl = ctx.values.url ?? DEFAULT_PLAYGROUND_URL;
+    const studioUIUrl = ctx.values.url ?? DEFAULT_STUDIO_UI_URL;
     const env = parseEnvArgs(ctx.values.env);
     const jsonMode = ctx.values.json;
 
@@ -133,26 +133,26 @@ export const execCommand = define({
 
     let response: Response;
     try {
-      response = await fetch(`${playgroundUrl}/api/execute`, {
+      response = await fetch(`${studioUIUrl}/api/execute`, {
         method: "POST",
         headers: { "Content-Type": "application/json" },
         body,
       });
     } catch {
       errorOutput(
-        `Could not connect to playground at ${playgroundUrl}. Is it running? (deno task playground)`,
+        `Could not connect to Studio UI at ${studioUIUrl}. Is it running? (deno task studio-ui)`,
       );
       process.exit(1);
     }
 
     if (!response.ok) {
       const text = await response.text();
-      errorOutput(`Playground returned ${response.status}: ${text}`);
+      errorOutput(`Studio UI returned ${response.status}: ${text}`);
       process.exit(1);
     }
 
     if (!response.body) {
-      errorOutput("No response body from playground");
+      errorOutput("No response body from Studio UI");
       process.exit(1);
     }
 
diff --git a/apps/atlas-cli/src/cli/commands/agent/index.ts b/apps/atlas-cli/src/cli/commands/agent/index.ts
index 6bce21be6..7dba39a56 100644
--- a/apps/atlas-cli/src/cli/commands/agent/index.ts
+++ b/apps/atlas-cli/src/cli/commands/agent/index.ts
@@ -27,6 +27,6 @@ export const agentCommand = define({
     console.log("  list, ls              List agents");
     console.log("  describe, show, get   View agent details");
     console.log("  register, r           Register an SDK agent");
-    console.log("  exec, x              Execute an agent via playground");
+    console.log("  exec, x              Execute an agent via Studio UI");
   },
 });
diff --git a/apps/atlasd/src/migrations/index.ts b/apps/atlasd/src/migrations/index.ts
index 9589b1650..6c1798683 100644
--- a/apps/atlasd/src/migrations/index.ts
+++ b/apps/atlasd/src/migrations/index.ts
@@ -55,6 +55,7 @@ import { migration as m_20260505_120000_elicitations_bootstrap } from "./m_20260
 import { migration as m_20260507_120000_drop_scratchpad_kv } from "./m_20260507_120000_drop_scratchpad_kv.ts";
 import { migration as m_20260511_110800_provision_workspace_members } from "./m_20260511_110800_provision_workspace_members.ts";
 import { migration as m_20260511_120000_cleanup_userid_as_name } from "./m_20260511_120000_cleanup_userid_as_name.ts";
+import { migration as m_20260513_013700_rename_playground_env_vars } from "./m_20260513_013700_rename_playground_env_vars.ts";
 
 /**
  * Static manifest. Ordered by id ascending — keep new entries in
@@ -88,6 +89,7 @@ const MIGRATIONS: readonly Migration[] = [
   m_20260507_120000_drop_scratchpad_kv,
   m_20260511_110800_provision_workspace_members,
   m_20260511_120000_cleanup_userid_as_name,
+  m_20260513_013700_rename_playground_env_vars,
 ];
 
 /**
diff --git a/apps/atlasd/src/migrations/m_20260513_013700_rename_playground_env_vars.test.ts b/apps/atlasd/src/migrations/m_20260513_013700_rename_playground_env_vars.test.ts
new file mode 100644
index 000000000..ef11a5c6c
--- /dev/null
+++ b/apps/atlasd/src/migrations/m_20260513_013700_rename_playground_env_vars.test.ts
@@ -0,0 +1,152 @@
+import { describe, expect, test } from "vitest";
+import { rewriteEnv } from "./m_20260513_013700_rename_playground_env_vars.ts";
+
+describe("rewriteEnv (playground → studio-ui env var migration)", () => {
+  describe("FRIDAY_PORT_PLAYGROUND → FRIDAY_PORT_STUDIO_UI", () => {
+    test("rewrites the legacy key, preserves the value", () => {
+      const input = "FRIDAY_PORT_PLAYGROUND=15200\n";
+      expect(rewriteEnv(input)).toBe("FRIDAY_PORT_STUDIO_UI=15200\n");
+    });
+
+    test("preserves custom user value (not just the installer default)", () => {
+      const input = "FRIDAY_PORT_PLAYGROUND=25200\n";
+      expect(rewriteEnv(input)).toBe("FRIDAY_PORT_STUDIO_UI=25200\n");
+    });
+
+    test("no-op when only the new key is present", () => {
+      const input = "FRIDAY_PORT_STUDIO_UI=15200\n";
+      expect(rewriteEnv(input)).toBe(input);
+    });
+
+    test("legacy value wins when both keys are present", () => {
+      // This is the post-installer state: ensure_platform_env_vars
+      // seeded FRIDAY_PORT_STUDIO_UI=15200 (default) before migration,
+      // but the user's customised legacy value should survive.
+      const input = "FRIDAY_PORT_STUDIO_UI=15200\nFRIDAY_PORT_PLAYGROUND=25200\n";
+      expect(rewriteEnv(input)).toBe("FRIDAY_PORT_STUDIO_UI=25200\n");
+    });
+
+    test("legacy line position is preserved when new-key line is dropped", () => {
+      // Legacy appears AFTER the new key in the file — the rewritten
+      // line stays at the legacy's original position; the new-key line
+      // is removed from where it was.
+      const input = [
+        "FRIDAY_ENV=dev",
+        "FRIDAY_PORT_STUDIO_UI=15200",
+        "FRIDAY_PORT_FRIDAY=18080",
+        "FRIDAY_PORT_PLAYGROUND=25200",
+        "",
+      ].join("\n");
+      expect(rewriteEnv(input)).toBe(
+        ["FRIDAY_ENV=dev", "FRIDAY_PORT_FRIDAY=18080", "FRIDAY_PORT_STUDIO_UI=25200", ""].join(
+          "\n",
+        ),
+      );
+    });
+  });
+
+  describe("PLAYGROUND_PORT → STUDIO_UI_PORT", () => {
+    test("rewrites the legacy key, preserves the value", () => {
+      const input = "PLAYGROUND_PORT=5200\n";
+      expect(rewriteEnv(input)).toBe("STUDIO_UI_PORT=5200\n");
+    });
+
+    test("legacy value wins when both are present", () => {
+      const input = "STUDIO_UI_PORT=5200\nPLAYGROUND_PORT=6300\n";
+      expect(rewriteEnv(input)).toBe("STUDIO_UI_PORT=6300\n");
+    });
+  });
+
+  describe("PLAYGROUND_HOST → STUDIO_UI_HOST", () => {
+    test("rewrites the legacy key, preserves the value", () => {
+      const input = "PLAYGROUND_HOST=0.0.0.0\n";
+      expect(rewriteEnv(input)).toBe("STUDIO_UI_HOST=0.0.0.0\n");
+    });
+
+    test("legacy value wins when both are present", () => {
+      const input = "STUDIO_UI_HOST=127.0.0.1\nPLAYGROUND_HOST=0.0.0.0\n";
+      expect(rewriteEnv(input)).toBe("STUDIO_UI_HOST=0.0.0.0\n");
+    });
+  });
+
+  describe("multiple legacy keys in one file", () => {
+    test("rewrites all three pairs independently", () => {
+      const input = [
+        "FRIDAY_PORT_PLAYGROUND=15200",
+        "PLAYGROUND_PORT=5200",
+        "PLAYGROUND_HOST=0.0.0.0",
+        "",
+      ].join("\n");
+      expect(rewriteEnv(input)).toBe(
+        ["FRIDAY_PORT_STUDIO_UI=15200", "STUDIO_UI_PORT=5200", "STUDIO_UI_HOST=0.0.0.0", ""].join(
+          "\n",
+        ),
+      );
+    });
+
+    test("rewrites only the pairs whose legacy key is set", () => {
+      // FRIDAY_PORT_PLAYGROUND set, PLAYGROUND_PORT not set, PLAYGROUND_HOST set
+      const input = ["FRIDAY_PORT_PLAYGROUND=15200", "PLAYGROUND_HOST=0.0.0.0", ""].join("\n");
+      expect(rewriteEnv(input)).toBe(
+        ["FRIDAY_PORT_STUDIO_UI=15200", "STUDIO_UI_HOST=0.0.0.0", ""].join("\n"),
+      );
+    });
+  });
+
+  describe("formatting + edge cases", () => {
+    test("preserves surrounding lines, comments, and blank lines", () => {
+      const input = [
+        "# Friday Studio installer-written defaults",
+        "",
+        "FRIDAY_ENV=dev",
+        "FRIDAY_PORT_FRIDAY=18080",
+        "FRIDAY_PORT_PLAYGROUND=15200",
+        "FRIDAY_PORT_WEBHOOK_TUNNEL=19090",
+        "",
+        "# user override below",
+        'ANTHROPIC_API_KEY="sk-ant-xxxxx"',
+        "",
+      ].join("\n");
+      expect(rewriteEnv(input)).toBe(
+        [
+          "# Friday Studio installer-written defaults",
+          "",
+          "FRIDAY_ENV=dev",
+          "FRIDAY_PORT_FRIDAY=18080",
+          "FRIDAY_PORT_STUDIO_UI=15200",
+          "FRIDAY_PORT_WEBHOOK_TUNNEL=19090",
+          "",
+          "# user override below",
+          'ANTHROPIC_API_KEY="sk-ant-xxxxx"',
+          "",
+        ].join("\n"),
+      );
+    });
+
+    test("no-op when no legacy keys are present", () => {
+      const input = "FRIDAY_ENV=dev\nFRIDAY_PORT_FRIDAY=18080\n";
+      expect(rewriteEnv(input)).toBe(input);
+    });
+
+    test("no-op on empty file", () => {
+      expect(rewriteEnv("")).toBe("");
+    });
+
+    test("ignores commented-out legacy keys", () => {
+      const input = "# FRIDAY_PORT_PLAYGROUND=15200\nFRIDAY_PORT_STUDIO_UI=25200\n";
+      expect(rewriteEnv(input)).toBe(input);
+    });
+
+    test("idempotent: second pass leaves output unchanged", () => {
+      const once = rewriteEnv(
+        "FRIDAY_PORT_PLAYGROUND=15200\nPLAYGROUND_PORT=5200\nPLAYGROUND_HOST=0.0.0.0\n",
+      );
+      expect(rewriteEnv(once)).toBe(once);
+    });
+
+    test("preserves quoted values", () => {
+      const input = 'FRIDAY_PORT_PLAYGROUND="15200"\n';
+      expect(rewriteEnv(input)).toBe('FRIDAY_PORT_STUDIO_UI="15200"\n');
+    });
+  });
+});
diff --git a/apps/atlasd/src/migrations/m_20260513_013700_rename_playground_env_vars.ts b/apps/atlasd/src/migrations/m_20260513_013700_rename_playground_env_vars.ts
new file mode 100644
index 000000000..b49d25afe
--- /dev/null
+++ b/apps/atlasd/src/migrations/m_20260513_013700_rename_playground_env_vars.ts
@@ -0,0 +1,137 @@
+/**
+ * Migration: rename legacy `*PLAYGROUND*` env var keys in
+ * `<friday_home>/.env` to their `*STUDIO_UI*` equivalents.
+ *
+ * The studio-ui binary used to be named `playground`. Three env var
+ * names changed in the rename:
+ *
+ *   FRIDAY_PORT_PLAYGROUND  → FRIDAY_PORT_STUDIO_UI   (launcher port override)
+ *   PLAYGROUND_PORT         → STUDIO_UI_PORT          (binary bind port)
+ *   PLAYGROUND_HOST         → STUDIO_UI_HOST          (binary bind host)
+ *
+ * `FRIDAY_PORT_PLAYGROUND` is the only one the installer wrote by default;
+ * the other two are normally injected by the launcher at boot and never
+ * persisted. We still migrate them defensively in case a user added them
+ * to `.env` by hand for debugging or custom setups.
+ *
+ * Behaviour for each pair:
+ *   - .env missing → no-op (whole migration).
+ *   - Only legacy present → rewrite the key, keep the value.
+ *   - Only new present → no-op for that pair (already migrated).
+ *   - Both present → **legacy value wins**: drop the new-key line and
+ *     rewrite the legacy line. This is critical for FRIDAY_PORT_STUDIO_UI
+ *     because the installer's `ensure_platform_env_vars` runs BEFORE
+ *     `friday migrate` and seeds the new key at the installer default —
+ *     so on every upgrade, both keys are temporarily present, and a
+ *     user who customised the legacy key would otherwise silently lose
+ *     their value to the default.
+ *
+ * Idempotent: re-running after success is a no-op. Line-by-line rewrite
+ * preserves formatting, comments, and unrelated variables.
+ */
+
+import { join } from "node:path";
+import { getFridayHome } from "@atlas/utils/paths.server";
+import type { Migration } from "jetstream";
+
+const RENAMES: ReadonlyArray<readonly [string, string]> = [
+  ["FRIDAY_PORT_PLAYGROUND", "FRIDAY_PORT_STUDIO_UI"],
+  ["PLAYGROUND_PORT", "STUDIO_UI_PORT"],
+  ["PLAYGROUND_HOST", "STUDIO_UI_HOST"],
+];
+
+export const migration: Migration = {
+  id: "20260513_013700_rename_playground_env_vars",
+  name: "rename legacy PLAYGROUND env var keys → STUDIO_UI",
+  description:
+    "Rewrites legacy *PLAYGROUND* keys (FRIDAY_PORT_PLAYGROUND, PLAYGROUND_PORT, " +
+    "PLAYGROUND_HOST) in ~/.friday/local/.env to their *STUDIO_UI* equivalents " +
+    "after the agent-playground → studio-ui rename. No-op if the file or any " +
+    "particular legacy key is absent.",
+  async run({ logger }) {
+    const path = join(getFridayHome(), ".env");
+
+    let raw: string;
+    try {
+      raw = await Deno.readTextFile(path);
+    } catch (err) {
+      if (err instanceof Deno.errors.NotFound) {
+        logger.debug(".env not present — nothing to migrate", { path });
+        return;
+      }
+      throw err;
+    }
+
+    const rewritten = rewriteEnv(raw);
+    if (rewritten === raw) {
+      logger.debug("no legacy playground env vars found — nothing to migrate", { path });
+      return;
+    }
+
+    await Deno.writeTextFile(path, rewritten);
+    logger.info("rewrote legacy playground env vars", { path, renames: RENAMES.length });
+  },
+};
+
+/**
+ * Exported for testing. Pure function — given .env text, returns the
+ * rewritten text (or the input unchanged if no migration is needed).
+ *
+ * Each rename pair is applied independently: if `FRIDAY_PORT_PLAYGROUND`
+ * is present but `PLAYGROUND_PORT` isn't, only the first is rewritten.
+ */
+export function rewriteEnv(raw: string): string {
+  let result = raw;
+  for (const [legacy, replacement] of RENAMES) {
+    result = rewriteKey(result, legacy, replacement);
+  }
+  return result;
+}
+
+/**
+ * Apply one (legacy → new) rename to env text.
+ *
+ * - If only the legacy key is present, rewrite its key prefix in place.
+ * - If only the new key is present, leave the file unchanged.
+ * - If both are present, the legacy line wins: drop the new-key line
+ *   and rewrite the legacy line. This preserves user customisations
+ *   against the installer's add-if-missing default which runs before
+ *   this migration on upgrade.
+ *
+ * The value is always preserved verbatim — quoting, whitespace after
+ * the `=`, comments on the line are all left intact.
+ */
+function rewriteKey(raw: string, legacy: string, replacement: string): string {
+  const lines = raw.split("\n");
+  const legacyPresent = lines.some((line) => keyOf(line) === legacy);
+  if (!legacyPresent) return raw;
+
+  // Legacy is present, so we're definitely rewriting. If the new key
+  // is also present, drop its line (legacy value wins per docstring).
+  const out: string[] = [];
+  for (const line of lines) {
+    const key = keyOf(line);
+    if (key === replacement) continue;
+    if (key !== legacy) {
+      out.push(line);
+      continue;
+    }
+    // Rewrite the legacy key prefix, preserve everything after the `=`.
+    const eq = line.indexOf("=");
+    out.push(replacement + line.slice(eq));
+  }
+  return out.join("\n");
+}
+
+/**
+ * Return the key of a `KEY=VALUE` line, or null for comments / blank
+ * lines / malformed lines. Tolerates surrounding whitespace before the
+ * key (rare but valid in some dotenv implementations).
+ */
+function keyOf(line: string): string | null {
+  const trimmed = line.trimStart();
+  if (trimmed === "" || trimmed.startsWith("#")) return null;
+  const eq = trimmed.indexOf("=");
+  if (eq <= 0) return null;
+  return trimmed.slice(0, eq).trim();
+}
diff --git a/apps/studio-installer/src-tauri/src/commands/ensure_agent_browser_chrome.rs b/apps/studio-installer/src-tauri/src/commands/ensure_agent_browser_chrome.rs
index 4066f9c22..01b6d9d5d 100644
--- a/apps/studio-installer/src-tauri/src/commands/ensure_agent_browser_chrome.rs
+++ b/apps/studio-installer/src-tauri/src/commands/ensure_agent_browser_chrome.rs
@@ -39,7 +39,7 @@ pub async fn ensure_agent_browser_chrome() -> Result<(), String> {
     };
     // Stack 3 split-destination layout: supervised binaries live under
     // <install_dir>/bin/, alongside the rest of the launcher-spawned
-    // tools (friday, link, webhook-tunnel, playground, …). install_dir
+    // tools (friday, link, webhook-tunnel, studio-ui, …). install_dir
     // itself holds user-data + the .app's friday-launcher entry point
     // only. Pre-Stack-3 builds put everything flat under install_dir,
     // which collided with user-data dir names — the link binary at
diff --git a/apps/studio-installer/src-tauri/src/commands/env_file.rs b/apps/studio-installer/src-tauri/src/commands/env_file.rs
index e0e86f8f1..09f0ec207 100644
--- a/apps/studio-installer/src-tauri/src/commands/env_file.rs
+++ b/apps/studio-installer/src-tauri/src/commands/env_file.rs
@@ -195,12 +195,12 @@ fn apply_platform_vars(
     //   FRIDAY_PORT_FRIDAY            18080  ← daemon (was 8080)
     //   FRIDAY_PORT_LINK              13100  ← link (was 3100)
     //   FRIDAY_PORT_WEBHOOK_TUNNEL    19090  ← tunnel (was 9090)
-    //   FRIDAY_PORT_PLAYGROUND        15200  ← studio UI (was 5200)
+    //   FRIDAY_PORT_STUDIO_UI        15200  ← studio UI (was 5200)
     //
     // The launcher imports ~/.friday/local/.env into its own process
     // env (tools/friday-launcher/main.go's importDotEnvIntoProcessEnv).
     // The matching EXTERNAL_*_URL / FRIDAYD_URL values ensure the
-    // playground UI's window.__FRIDAY_CONFIG__ points at the moved
+    // studio-ui's window.__FRIDAY_CONFIG__ points at the moved
     // daemon + tunnel — auto-derive isn't possible because the URLs
     // may also include user-controlled hostnames or schemes.
     let platform_vars: Vec<(&str, String)> = vec![
@@ -209,7 +209,7 @@ fn apply_platform_vars(
         ("FRIDAY_PORT_FRIDAY", "18080".to_string()),
         ("FRIDAY_PORT_LINK", "13100".to_string()),
         ("FRIDAY_PORT_WEBHOOK_TUNNEL", "19090".to_string()),
-        ("FRIDAY_PORT_PLAYGROUND", "15200".to_string()),
+        ("FRIDAY_PORT_STUDIO_UI", "15200".to_string()),
         ("FRIDAYD_URL", "http://localhost:18080".to_string()),
         ("EXTERNAL_DAEMON_URL", "http://localhost:18080".to_string()),
         ("EXTERNAL_TUNNEL_URL", "http://localhost:19090".to_string()),
@@ -263,20 +263,20 @@ pub fn ensure_platform_env_vars() -> Result<String, String> {
 }
 
 /// Returns the URL the wizard should open in the user's browser to
-/// land on the local playground. Reads FRIDAY_PORT_PLAYGROUND from
+/// land on the local studio-ui. Reads FRIDAY_PORT_STUDIO_UI from
 /// ~/.friday/local/.env (which the wizard itself writes during the
 /// API Keys step) and falls back to 15200 if the file is missing or
 /// the key is unset. Centralised so every "open studio" entry point
-/// (Welcome, launchByOpening, openPlaygroundAndExit) lands on the
+/// (Welcome, launchByOpening, openStudioUIAndExit) lands on the
 /// same URL — pre-fix, all three hardcoded :5200 and broke any
 /// install with a port override.
 #[tauri::command]
-pub fn playground_url() -> Result<String, String> {
+pub fn studio_ui_url() -> Result<String, String> {
     let port = match fs::read_to_string(env_file_path()?) {
         Ok(content) => parse_env_lines(&content)
             .into_iter()
             .find_map(|(k, v)| match k {
-                Some(key) if key == "FRIDAY_PORT_PLAYGROUND" => Some(v.trim().to_string()),
+                Some(key) if key == "FRIDAY_PORT_STUDIO_UI" => Some(v.trim().to_string()),
                 _ => None,
             })
             .filter(|s| !s.is_empty())
diff --git a/apps/studio-installer/src-tauri/src/commands/wait_health.rs b/apps/studio-installer/src-tauri/src/commands/wait_health.rs
index 8769ee828..62b6fe0c4 100644
--- a/apps/studio-installer/src-tauri/src/commands/wait_health.rs
+++ b/apps/studio-installer/src-tauri/src/commands/wait_health.rs
@@ -57,7 +57,7 @@ const SSE_BACKOFF_MAX_MS: u64 = 2000;
 ///
 /// Sized for the 95th percentile of cold first boots: friday
 /// daemon needs ~30-60s on a fresh machine (workspace scan + skill
-/// bundle hashing + cron registration), then playground tacks on
+/// bundle hashing + cron registration), then studio-ui tacks on
 /// 10-30s for the first SvelteKit render. 90s soft → user sees
 /// "Still starting up…" past most slow boots without crying wolf
 /// on the median ~25s case.
@@ -71,7 +71,7 @@ const SOFT_DEADLINE_SECS: u64 = 90;
 ///
 /// Bumped from 90s → 180s after observing cold first boots on
 /// fresh macOS systems push past the 90s mark with friday and
-/// playground still in pending. Total budget with 3 extensions
+/// studio-ui still in pending. Total budget with 3 extensions
 /// of 60s = 180 + 180 = 360s (6 min) which is enough for the
 /// slowest boots we've seen.
 const HARD_DEADLINE_SECS: u64 = 180;
@@ -125,11 +125,11 @@ pub enum HealthEvent {
     /// Soft deadline (60s) elapsed. UI swaps to long-wait copy.
     SoftDeadline,
     /// Hard deadline elapsed. Carries the names of services NOT
-    /// healthy + a flag indicating whether playground is among the
+    /// healthy + a flag indicating whether studio-ui is among the
     /// healthy ones (used by the partial-success "Open anyway" rule).
     Timeout {
         stuck: Vec<String>,
-        playground_healthy: bool,
+        studio_ui_healthy: bool,
     },
     /// SSE-connect retry budget exhausted, stream closed
     /// unexpectedly, or stream errored mid-flight. Frontend shows
@@ -149,7 +149,7 @@ pub enum HealthEvent {
 /// Service name we treat as the user-facing surface for the
 /// partial-success "Open anyway" rule. Centralised here so the
 /// timeout-event builder and the frontend gate agree.
-const PLAYGROUND_SERVICE_NAME: &str = "playground";
+const STUDIO_UI_SERVICE_NAME: &str = "studio-ui";
 
 /// Mutable state shared between `wait_for_services` and
 /// `extend_wait_deadline`. The deadline is stored as nanos-from-
@@ -332,16 +332,16 @@ fn parse_sse_chunks(buf: &str) -> (usize, Vec<String>) {
 
 /// Build a `Timeout` event from the most-recent observed snapshot.
 /// `stuck` is every service whose status isn't "healthy";
-/// `playground_healthy` drives the partial-success rule. If we
+/// `studio_ui_healthy` drives the partial-success rule. If we
 /// never observed a snapshot (no SSE events arrived in the wait
 /// window — extreme), the timeout event is empty + non-healthy
-/// playground, which makes the frontend hide "Open anyway" and
+/// studio-ui, which makes the frontend hide "Open anyway" and
 /// just show View logs / Wait again.
 fn timeout_event_from_snapshot(latest: Option<&HealthSnapshot>) -> HealthEvent {
     let Some(snap) = latest else {
         return HealthEvent::Timeout {
             stuck: Vec::new(),
-            playground_healthy: false,
+            studio_ui_healthy: false,
         };
     };
     let stuck: Vec<String> = snap
@@ -350,13 +350,13 @@ fn timeout_event_from_snapshot(latest: Option<&HealthSnapshot>) -> HealthEvent {
         .filter(|s| s.status != "healthy")
         .map(|s| s.name.clone())
         .collect();
-    let playground_healthy = snap
+    let studio_ui_healthy = snap
         .services
         .iter()
-        .any(|s| s.name == PLAYGROUND_SERVICE_NAME && s.status == "healthy");
+        .any(|s| s.name == STUDIO_UI_SERVICE_NAME && s.status == "healthy");
     HealthEvent::Timeout {
         stuck,
-        playground_healthy,
+        studio_ui_healthy,
     }
 }
 
@@ -405,7 +405,7 @@ pub async fn wait_for_services(
     let mut soft_fired = false;
     let mut timeout_fired = false;
     // Track the most-recent snapshot so the timeout event can
-    // populate `stuck` + `playground_healthy` honestly.
+    // populate `stuck` + `studio_ui_healthy` honestly.
     let mut latest_snapshot: Option<HealthSnapshot> = None;
 
     let mut stream = resp.bytes_stream();
@@ -429,7 +429,7 @@ pub async fn wait_for_services(
         if remaining_nanos <= 0 {
             // Hard deadline elapsed.
             //   - First time: emit Timeout (with the real stuck
-            //     list and playground status) and park on the
+            //     list and studio-ui status) and park on the
             //     extend_notify; resuming on extension or supersede.
             //   - If the cap is reached and no further extension
             //     can come: the frontend stops calling extend, the
@@ -722,47 +722,47 @@ mod tests {
         let s = snap(vec![
             svc("nats-server", "healthy"),
             svc("friday", "starting"),
-            svc("playground", "starting"),
+            svc("studio-ui", "starting"),
         ]);
         let HealthEvent::Timeout {
             stuck,
-            playground_healthy,
+            studio_ui_healthy,
         } = timeout_event_from_snapshot(Some(&s))
         else {
             panic!("expected Timeout variant");
         };
-        assert_eq!(stuck, vec!["friday".to_string(), "playground".to_string()]);
-        assert!(!playground_healthy);
+        assert_eq!(stuck, vec!["friday".to_string(), "studio-ui".to_string()]);
+        assert!(!studio_ui_healthy);
     }
 
     #[test]
-    fn timeout_event_sets_playground_healthy_when_playground_green() {
+    fn timeout_event_sets_studio_ui_healthy_when_studio_ui_green() {
         let s = snap(vec![
-            svc("playground", "healthy"),
+            svc("studio-ui", "healthy"),
             svc("webhook-tunnel", "starting"),
         ]);
         let HealthEvent::Timeout {
             stuck,
-            playground_healthy,
+            studio_ui_healthy,
         } = timeout_event_from_snapshot(Some(&s))
         else {
             panic!("expected Timeout variant");
         };
         assert_eq!(stuck, vec!["webhook-tunnel".to_string()]);
-        assert!(playground_healthy);
+        assert!(studio_ui_healthy);
     }
 
     #[test]
     fn timeout_event_no_snapshot_yields_empty_payload() {
         let HealthEvent::Timeout {
             stuck,
-            playground_healthy,
+            studio_ui_healthy,
         } = timeout_event_from_snapshot(None)
         else {
             panic!("expected Timeout variant");
         };
         assert!(stuck.is_empty());
-        assert!(!playground_healthy);
+        assert!(!studio_ui_healthy);
     }
 
     // ── WaitDeadlineState extension cap ────────────────────────
diff --git a/apps/studio-installer/src-tauri/src/lib.rs b/apps/studio-installer/src-tauri/src/lib.rs
index 8a630939a..a7272df2d 100644
--- a/apps/studio-installer/src-tauri/src/lib.rs
+++ b/apps/studio-installer/src-tauri/src/lib.rs
@@ -13,7 +13,7 @@ use commands::{
     ensure_claude_code::ensure_claude_code,
     download_checkpoint::{check_download_complete, mark_download_complete},
     env_file::{
-        ensure_platform_env_vars, env_file_has_provider_key, env_file_location, playground_url,
+        ensure_platform_env_vars, env_file_has_provider_key, env_file_location, studio_ui_url,
         write_env_file,
     },
     exit_installer::exit_installer,
@@ -58,7 +58,7 @@ pub fn run() {
             ensure_platform_env_vars,
             env_file_has_provider_key,
             env_file_location,
-            playground_url,
+            studio_ui_url,
             exit_installer,
             stop_running_launcher,
             launch_studio,
diff --git a/apps/studio-installer/src-tauri/tests/launcher_handoff.rs b/apps/studio-installer/src-tauri/tests/launcher_handoff.rs
index 63d18a911..be62ce1b6 100644
--- a/apps/studio-installer/src-tauri/tests/launcher_handoff.rs
+++ b/apps/studio-installer/src-tauri/tests/launcher_handoff.rs
@@ -152,7 +152,7 @@ fn override_home(test_home: &PathBuf) {
     env::set_var("FRIDAY_PORT_friday", "28080");
     env::set_var("FRIDAY_PORT_link", "23100");
     env::set_var("FRIDAY_PORT_webhook_tunnel", "29090");
-    env::set_var("FRIDAY_PORT_playground", "25200");
+    env::set_var("FRIDAY_PORT_studio_ui", "25200");
 }
 
 fn pidfile_path() -> PathBuf {
@@ -214,7 +214,7 @@ fn installer_launcher_handoff_and_clean_shutdown() {
     write_wrapper(&install_dir, &stub, "friday", "28080", "/health");
     write_wrapper(&install_dir, &stub, "link", "23100", "/health");
     write_wrapper(&install_dir, &stub, "webhook-tunnel", "29090", "/health");
-    write_wrapper(&install_dir, &stub, "playground", "25200", "/");
+    write_wrapper(&install_dir, &stub, "studio-ui", "25200", "/");
 
     // 2. Override HOME + FRIDAY_LAUNCHER_HOME + FRIDAY_PORT_* so our
     //    test doesn't touch real ~/.friday.
diff --git a/apps/studio-installer/src/App.svelte b/apps/studio-installer/src/App.svelte
index 50e4ce11d..0d7b2498c 100644
--- a/apps/studio-installer/src/App.svelte
+++ b/apps/studio-installer/src/App.svelte
@@ -80,7 +80,7 @@ onMount(async () => {
 
     /*
       Color tokens — mirror @atlas/ui/tokens.css so the installer
-      shares the same palette as the agent-playground (and any other
+      shares the same palette as studio-ui (and any other
       surface in the monorepo that consumes those tokens). Same
       light-dark() pattern, same semantic naming. Inlined here
       rather than imported because the installer is a leaf Tauri
diff --git a/apps/studio-installer/src/lib/installer.ts b/apps/studio-installer/src/lib/installer.ts
index b3924c8f9..d586f7828 100644
--- a/apps/studio-installer/src/lib/installer.ts
+++ b/apps/studio-installer/src/lib/installer.ts
@@ -191,7 +191,7 @@ async function launchByOpening(): Promise<void> {
   try {
     // Tauri 2 plugin-opener exports openUrl, not a default `open()`.
     const { openUrl } = await import("@tauri-apps/plugin-opener");
-    await openUrl(await resolvePlaygroundUrl());
+    await openUrl(await resolveStudioUIUrl());
   } catch {
     // ignore — browser might already be open
   }
@@ -199,14 +199,14 @@ async function launchByOpening(): Promise<void> {
 
 /**
  * Returns the URL the wizard should open to land on the local
- * playground, honoring FRIDAY_PORT_PLAYGROUND from ~/.friday/local/.env.
+ * studio-ui, honoring FRIDAY_PORT_STUDIO_UI from ~/.friday/local/.env.
  * Centralises the lookup so every "open studio" entry point lands on
  * the same URL — pre-fix, three call sites hardcoded :5200 and broke
  * any install with a port override.
  */
-async function resolvePlaygroundUrl(): Promise<string> {
+async function resolveStudioUIUrl(): Promise<string> {
   try {
-    return await invoke<string>("playground_url");
+    return await invoke<string>("studio_ui_url");
   } catch {
     // Tauri command unavailable (test env etc.) — fall back to the
     // installer's default port.
@@ -430,15 +430,15 @@ export type HealthEvent =
       shutting_down: boolean;
     }
   | { kind: "soft-deadline" }
-  | { kind: "timeout"; stuck: string[]; playground_healthy: boolean }
+  | { kind: "timeout"; stuck: string[]; studio_ui_healthy: boolean }
   | { kind: "unreachable"; reason: string }
   | { kind: "shutting-down" };
 
-// `playground` is the user-facing surface that the browser actually
+// `studio-ui` is the user-facing surface that the browser actually
 // loads; if it's healthy at hard-deadline we still let the user
 // proceed via "Open anyway". Centralizing the name here avoids
 // stringly-typed checks scattered across the UI.
-const PLAYGROUND_SERVICE_NAME = "playground";
+const STUDIO_UI_SERVICE_NAME = "studio-ui";
 
 /**
  * Subscribe to the launcher's health stream and update the store as
@@ -459,7 +459,7 @@ export async function waitForServices(): Promise<void> {
   store.waitElapsedSecs = 0;
   store.waitDeadlineExtensions = 0;
   store.stuckServices = [];
-  store.playgroundHealthyAtTimeout = false;
+  store.studioUIHealthyAtTimeout = false;
   store.launchUnreachableReason = null;
 
   const channel = new Channel<HealthEvent>();
@@ -489,7 +489,7 @@ export async function waitForServices(): Promise<void> {
         break;
       case "timeout":
         store.stuckServices = event.stuck;
-        store.playgroundHealthyAtTimeout = event.playground_healthy;
+        store.studioUIHealthyAtTimeout = event.studio_ui_healthy;
         store.launchStage = "timeout";
         break;
       case "unreachable":
@@ -525,12 +525,12 @@ export async function extendWaitDeadline(): Promise<number | null> {
 }
 
 /**
- * Returns the playground row from the current snapshot, or undefined
+ * Returns the studio-ui row from the current snapshot, or undefined
  * if it hasn't been observed yet. Used by Launch.svelte to decide
  * whether to expose "Open anyway" alongside the timeout treatment.
  */
-export function getPlaygroundService(): ServiceStatus | undefined {
-  return store.services.find((s) => s.name === PLAYGROUND_SERVICE_NAME);
+export function getStudioUIService(): ServiceStatus | undefined {
+  return store.services.find((s) => s.name === STUDIO_UI_SERVICE_NAME);
 }
 
 /**
@@ -575,7 +575,7 @@ export async function createAppBundleIfDarwin(installDir: string, version: strin
 }
 
 /**
- * Open the playground in the user's browser and exit the wizard.
+ * Open studio-ui in the user's browser and exit the wizard.
  * The launcher is detached from the wizard at spawn time, so exiting
  * the wizard does NOT kill the platform — the launcher keeps
  * supervising its services. Same exit logic for "Open anyway".
@@ -587,10 +587,10 @@ export async function createAppBundleIfDarwin(installDir: string, version: strin
  * window up after openUrl resolves). `app.exit(0)` from Rust
  * bypasses every JS-level prevention path.
  */
-export async function openPlaygroundAndExit(): Promise<void> {
+export async function openStudioUIAndExit(): Promise<void> {
   try {
     const { openUrl } = await import("@tauri-apps/plugin-opener");
-    await openUrl(await resolvePlaygroundUrl());
+    await openUrl(await resolveStudioUIUrl());
   } catch {
     // ignore — browser might already be open or plugin unavailable
   }
diff --git a/apps/studio-installer/src/lib/store.svelte.ts b/apps/studio-installer/src/lib/store.svelte.ts
index fc97ca6c2..7e45087c9 100644
--- a/apps/studio-installer/src/lib/store.svelte.ts
+++ b/apps/studio-installer/src/lib/store.svelte.ts
@@ -115,9 +115,9 @@ function createStore() {
   // The names of services that were NOT healthy when the hard
   // deadline fired. Drives the timeout-state messaging.
   let stuckServices = $state<string[]>([]);
-  // Whether playground was healthy at the timeout — the
+  // Whether studio-ui was healthy at the timeout — the
   // partial-success rule allows "Open anyway" iff this is true.
-  let playgroundHealthyAtTimeout = $state(false);
+  let studioUIHealthyAtTimeout = $state(false);
   // Free-form reason from a HealthEvent::Unreachable. Surfaced in
   // the unreachable-stage UI alongside View logs.
   let launchUnreachableReason = $state<string | null>(null);
@@ -350,11 +350,11 @@ function createStore() {
     set stuckServices(v: string[]) {
       stuckServices = v;
     },
-    get playgroundHealthyAtTimeout(): boolean {
-      return playgroundHealthyAtTimeout;
+    get studioUIHealthyAtTimeout(): boolean {
+      return studioUIHealthyAtTimeout;
     },
-    set playgroundHealthyAtTimeout(v: boolean) {
-      playgroundHealthyAtTimeout = v;
+    set studioUIHealthyAtTimeout(v: boolean) {
+      studioUIHealthyAtTimeout = v;
     },
     get launchUnreachableReason(): string | null {
       return launchUnreachableReason;
diff --git a/apps/studio-installer/src/steps/Launch.svelte b/apps/studio-installer/src/steps/Launch.svelte
index a0fb44f38..94c4f68ef 100644
--- a/apps/studio-installer/src/steps/Launch.svelte
+++ b/apps/studio-installer/src/steps/Launch.svelte
@@ -3,9 +3,9 @@ import { invoke } from "@tauri-apps/api/core";
 import { onMount } from "svelte";
 import {
   extendWaitDeadline,
-  getPlaygroundService,
+  getStudioUIService,
   installDir,
-  openPlaygroundAndExit,
+  openStudioUIAndExit,
   runLaunch,
   waitForServices,
 } from "../lib/installer.ts";
@@ -82,8 +82,8 @@ async function onOpenLogs(): Promise<void> {
   }
 }
 
-// "Open anyway" gate: only show when playground is healthy at the
-// timeout AND nothing's outright failed. If the user's playground
+// "Open anyway" gate: only show when studio-ui is healthy at the
+// timeout AND nothing's outright failed. If the user's studio-ui
 // is stuck or another service is in failed state the browser would
 // hit a daemon that isn't going to recover, so we'd be sending the
 // user into a broken UI. Bail-out belongs to Exit instead.
@@ -91,8 +91,8 @@ let hasFailedService = $derived.by(() => store.services.some((s) => s.status ===
 let canOpenAnyway = $derived.by(() => {
   if (store.launchStage !== "timeout") return false;
   if (hasFailedService) return false;
-  const playground = getPlaygroundService();
-  return playground?.status === "healthy";
+  const studioUI = getStudioUIService();
+  return studioUI?.status === "healthy";
 });
 
 // "Wait again" gate: hide once the cap of 2 extensions is reached.
@@ -145,7 +145,7 @@ function prettyName(name: string): string {
       return "Authentication";
     case "webhook-tunnel":
       return "Webhook tunnel";
-    case "playground":
+    case "studio-ui":
       return "Studio UI";
     default:
       return name;
@@ -196,7 +196,7 @@ function prettyName(name: string): string {
             <span class="row-name">{prettyName(svc.name)}</span>
           </div>
         {/each}
-        <button class="primary" onclick={openPlaygroundAndExit}
+        <button class="primary" onclick={openStudioUIAndExit}
           >Open in Browser</button
         >
       </div>
@@ -247,7 +247,7 @@ function prettyName(name: string): string {
             <!--
               At least one supervised process is in a failed state
               (a real "✗", not just "starting…"). Opening the
-              playground would hit a daemon that isn't going to
+              studio-ui would hit a daemon that isn't going to
               recover; offering "Open anyway" would just send the
               user into a broken UI. Show Exit instead so they can
               close the wizard, fix the underlying error (usually
@@ -255,7 +255,7 @@ function prettyName(name: string): string {
             -->
             <button class="primary" onclick={onExitInstaller}>Exit</button>
           {:else if canOpenAnyway}
-            <button class="primary" onclick={openPlaygroundAndExit}
+            <button class="primary" onclick={openStudioUIAndExit}
               >Open anyway</button
             >
           {/if}
diff --git a/apps/studio-installer/src/steps/Welcome.svelte b/apps/studio-installer/src/steps/Welcome.svelte
index ed1566a6f..9a4f0ac2f 100644
--- a/apps/studio-installer/src/steps/Welcome.svelte
+++ b/apps/studio-installer/src/steps/Welcome.svelte
@@ -110,11 +110,11 @@ function cancelDevPanel(): void {
 async function openStudio(): Promise<void> {
   // Tauri 2 plugin-opener exports openUrl, not a default `open()`.
   const { openUrl } = await import("@tauri-apps/plugin-opener");
-  // playground_url() resolves FRIDAY_PORT_PLAYGROUND from ~/.friday/local/.env
+  // studio_ui_url() resolves FRIDAY_PORT_STUDIO_UI from ~/.friday/local/.env
   // — installs with a port override land on the right URL.
   let url = "http://localhost:15200";
   try {
-    url = await invoke<string>("playground_url");
+    url = await invoke<string>("studio_ui_url");
   } catch {
     // Fall back to the installer's default port.
   }
diff --git a/tools/agent-playground/.gitignore b/apps/studio-ui/.gitignore
similarity index 100%
rename from tools/agent-playground/.gitignore
rename to apps/studio-ui/.gitignore
diff --git a/tools/agent-playground/.prettierignore b/apps/studio-ui/.prettierignore
similarity index 100%
rename from tools/agent-playground/.prettierignore
rename to apps/studio-ui/.prettierignore
diff --git a/tools/agent-playground/CLAUDE.md b/apps/studio-ui/CLAUDE.md
similarity index 91%
rename from tools/agent-playground/CLAUDE.md
rename to apps/studio-ui/CLAUDE.md
index c2239de44..dc00379b0 100644
--- a/tools/agent-playground/CLAUDE.md
+++ b/apps/studio-ui/CLAUDE.md
@@ -1,4 +1,4 @@
-# @atlas/agent-playground
+# @atlas/studio-ui
 
 Unified dev tool for agents and workspaces. SvelteKit + Hono with sidebar
 navigation, route-based pages, and full RPC type safety.
@@ -6,12 +6,12 @@ navigation, route-based pages, and full RPC type safety.
 ## Running
 
 ```bash
-deno task playground    # from monorepo root (http://localhost:5200)
+deno task studio-ui    # from monorepo root (http://localhost:5200)
 ```
 
-The playground also ships as a compiled binary in Friday Studio — the static
+studio-ui also ships as a compiled binary in Friday Studio — the static
 SvelteKit build is served alongside the Hono `/api/*` router from a single
-Deno entry point that gets `deno compile`'d into a `playground` binary.
+Deno entry point that gets `deno compile`'d into a `studio-ui` binary.
 
 ## Architecture
 
diff --git a/tools/agent-playground/README.md b/apps/studio-ui/README.md
similarity index 96%
rename from tools/agent-playground/README.md
rename to apps/studio-ui/README.md
index 37623bd20..2837e62ff 100644
--- a/tools/agent-playground/README.md
+++ b/apps/studio-ui/README.md
@@ -1,4 +1,4 @@
-# Agent Playground
+# Studio UI
 
 Local dev tool for executing and debugging Friday agents and workspaces. Runs as
 a SvelteKit app with a Hono API backend. No daemon, no database, no external
@@ -7,7 +7,7 @@ services — agents execute in hermetic isolation.
 ## Getting Started
 
 ```bash
-deno task playground     # from monorepo root — starts on http://localhost:5200
+deno task studio-ui     # from monorepo root — starts on http://localhost:5200
 ```
 
 Open `http://localhost:5200` in a browser. The sidebar has four sections:
@@ -125,7 +125,7 @@ Workspace execute also emits:
 ## File Structure
 
 ```
-tools/agent-playground/
+apps/studio-ui/
 ├── cli.ts                                 # Headless pipeline CLI
 ├── runs/workspaces/                       # Pipeline run artifacts
 ├── src/
@@ -234,8 +234,8 @@ const { agents } = await res.json(); // fully typed
 ## Tests
 
 ```bash
-deno task test tools/agent-playground/src/lib/server/    # all server tests
-deno task test tools/agent-playground/src/lib/server/lib/workspace/  # workspace harness
+deno task test apps/studio-ui/src/lib/server/    # all server tests
+deno task test apps/studio-ui/src/lib/server/lib/workspace/  # workspace harness
 ```
 
 ## Conventions
diff --git a/tools/agent-playground/deno.json b/apps/studio-ui/deno.json
similarity index 91%
rename from tools/agent-playground/deno.json
rename to apps/studio-ui/deno.json
index 2ab5603d2..8b81b9827 100644
--- a/tools/agent-playground/deno.json
+++ b/apps/studio-ui/deno.json
@@ -1,6 +1,6 @@
 {
   "$schema": "https://raw.githubusercontent.com/denoland/deno/main/cli/schemas/config-file.v1.json",
-  "name": "@atlas/agent-playground",
+  "name": "@atlas/studio-ui",
   "exports": "./mod.ts",
   "version": "0.1.0",
   "imports": { "hono/client": "npm:hono@4.12.18/client" },
diff --git a/tools/agent-playground/docs/tool-call-redesign-proposal.md b/apps/studio-ui/docs/tool-call-redesign-proposal.md
similarity index 100%
rename from tools/agent-playground/docs/tool-call-redesign-proposal.md
rename to apps/studio-ui/docs/tool-call-redesign-proposal.md
diff --git a/tools/agent-playground/eslint.config.js b/apps/studio-ui/eslint.config.js
similarity index 100%
rename from tools/agent-playground/eslint.config.js
rename to apps/studio-ui/eslint.config.js
diff --git a/apps/studio-ui/mod.ts b/apps/studio-ui/mod.ts
new file mode 100644
index 000000000..9213ccb96
--- /dev/null
+++ b/apps/studio-ui/mod.ts
@@ -0,0 +1,2 @@
+// @atlas/studio-ui — dev tool, no public exports
+export {};
diff --git a/tools/agent-playground/package.json b/apps/studio-ui/package.json
similarity index 98%
rename from tools/agent-playground/package.json
rename to apps/studio-ui/package.json
index a1e6a894e..7ee32bedf 100644
--- a/tools/agent-playground/package.json
+++ b/apps/studio-ui/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "@atlas/agent-playground",
+  "name": "@atlas/studio-ui",
   "version": "0.1.0",
   "private": true,
   "type": "module",
diff --git a/tools/agent-playground/prettier.config.js b/apps/studio-ui/prettier.config.js
similarity index 100%
rename from tools/agent-playground/prettier.config.js
rename to apps/studio-ui/prettier.config.js
diff --git a/tools/agent-playground/src/app.css b/apps/studio-ui/src/app.css
similarity index 100%
rename from tools/agent-playground/src/app.css
rename to apps/studio-ui/src/app.css
diff --git a/tools/agent-playground/src/app.d.ts b/apps/studio-ui/src/app.d.ts
similarity index 100%
rename from tools/agent-playground/src/app.d.ts
rename to apps/studio-ui/src/app.d.ts
diff --git a/tools/agent-playground/src/app.html b/apps/studio-ui/src/app.html
similarity index 100%
rename from tools/agent-playground/src/app.html
rename to apps/studio-ui/src/app.html
diff --git a/tools/agent-playground/src/hooks.server.ts b/apps/studio-ui/src/hooks.server.ts
similarity index 100%
rename from tools/agent-playground/src/hooks.server.ts
rename to apps/studio-ui/src/hooks.server.ts
diff --git a/tools/agent-playground/src/lib/__test-stubs__/app-environment.ts b/apps/studio-ui/src/lib/__test-stubs__/app-environment.ts
similarity index 100%
rename from tools/agent-playground/src/lib/__test-stubs__/app-environment.ts
rename to apps/studio-ui/src/lib/__test-stubs__/app-environment.ts
diff --git a/tools/agent-playground/src/lib/api/me.ts b/apps/studio-ui/src/lib/api/me.ts
similarity index 100%
rename from tools/agent-playground/src/lib/api/me.ts
rename to apps/studio-ui/src/lib/api/me.ts
diff --git a/tools/agent-playground/src/lib/api/memory.ts b/apps/studio-ui/src/lib/api/memory.ts
similarity index 100%
rename from tools/agent-playground/src/lib/api/memory.ts
rename to apps/studio-ui/src/lib/api/memory.ts
diff --git a/tools/agent-playground/src/lib/artifact-hints.ts b/apps/studio-ui/src/lib/artifact-hints.ts
similarity index 100%
rename from tools/agent-playground/src/lib/artifact-hints.ts
rename to apps/studio-ui/src/lib/artifact-hints.ts
diff --git a/tools/agent-playground/src/lib/assets/favicon.png b/apps/studio-ui/src/lib/assets/favicon.png
similarity index 100%
rename from tools/agent-playground/src/lib/assets/favicon.png
rename to apps/studio-ui/src/lib/assets/favicon.png
diff --git a/tools/agent-playground/src/lib/client.ts b/apps/studio-ui/src/lib/client.ts
similarity index 100%
rename from tools/agent-playground/src/lib/client.ts
rename to apps/studio-ui/src/lib/client.ts
diff --git a/tools/agent-playground/src/lib/collapsible-state.test.ts b/apps/studio-ui/src/lib/collapsible-state.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/collapsible-state.test.ts
rename to apps/studio-ui/src/lib/collapsible-state.test.ts
diff --git a/tools/agent-playground/src/lib/collapsible-state.ts b/apps/studio-ui/src/lib/collapsible-state.ts
similarity index 100%
rename from tools/agent-playground/src/lib/collapsible-state.ts
rename to apps/studio-ui/src/lib/collapsible-state.ts
diff --git a/tools/agent-playground/src/lib/components/MemoryEntryTable.svelte b/apps/studio-ui/src/lib/components/MemoryEntryTable.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/MemoryEntryTable.svelte
rename to apps/studio-ui/src/lib/components/MemoryEntryTable.svelte
diff --git a/tools/agent-playground/src/lib/components/agents/agent-catalog.svelte b/apps/studio-ui/src/lib/components/agents/agent-catalog.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/agents/agent-catalog.svelte
rename to apps/studio-ui/src/lib/components/agents/agent-catalog.svelte
diff --git a/tools/agent-playground/src/lib/components/agents/agent-editor-sidebar.svelte b/apps/studio-ui/src/lib/components/agents/agent-editor-sidebar.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/agents/agent-editor-sidebar.svelte
rename to apps/studio-ui/src/lib/components/agents/agent-editor-sidebar.svelte
diff --git a/tools/agent-playground/src/lib/components/agents/agent-index-sidebar.svelte b/apps/studio-ui/src/lib/components/agents/agent-index-sidebar.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/agents/agent-index-sidebar.svelte
rename to apps/studio-ui/src/lib/components/agents/agent-index-sidebar.svelte
diff --git a/tools/agent-playground/src/lib/components/agents/agent-io-schemas.svelte b/apps/studio-ui/src/lib/components/agents/agent-io-schemas.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/agents/agent-io-schemas.svelte
rename to apps/studio-ui/src/lib/components/agents/agent-io-schemas.svelte
diff --git a/tools/agent-playground/src/lib/components/agents/agent-reference-panel.svelte b/apps/studio-ui/src/lib/components/agents/agent-reference-panel.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/agents/agent-reference-panel.svelte
rename to apps/studio-ui/src/lib/components/agents/agent-reference-panel.svelte
diff --git a/tools/agent-playground/src/lib/components/agents/agent-workbench.svelte b/apps/studio-ui/src/lib/components/agents/agent-workbench.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/agents/agent-workbench.svelte
rename to apps/studio-ui/src/lib/components/agents/agent-workbench.svelte
diff --git a/tools/agent-playground/src/lib/components/agents/agents-card.svelte b/apps/studio-ui/src/lib/components/agents/agents-card.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/agents/agents-card.svelte
rename to apps/studio-ui/src/lib/components/agents/agents-card.svelte
diff --git a/tools/agent-playground/src/lib/components/agents/agents-strip.svelte b/apps/studio-ui/src/lib/components/agents/agents-strip.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/agents/agents-strip.svelte
rename to apps/studio-ui/src/lib/components/agents/agents-strip.svelte
diff --git a/tools/agent-playground/src/lib/components/agents/catalog-row.svelte b/apps/studio-ui/src/lib/components/agents/catalog-row.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/agents/catalog-row.svelte
rename to apps/studio-ui/src/lib/components/agents/catalog-row.svelte
diff --git a/tools/agent-playground/src/lib/components/agents/credential-panel.svelte b/apps/studio-ui/src/lib/components/agents/credential-panel.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/agents/credential-panel.svelte
rename to apps/studio-ui/src/lib/components/agents/credential-panel.svelte
diff --git a/tools/agent-playground/src/lib/components/agents/data-contracts-panel.svelte b/apps/studio-ui/src/lib/components/agents/data-contracts-panel.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/agents/data-contracts-panel.svelte
rename to apps/studio-ui/src/lib/components/agents/data-contracts-panel.svelte
diff --git a/tools/agent-playground/src/lib/components/agents/workspace-agent-sidebar.svelte b/apps/studio-ui/src/lib/components/agents/workspace-agent-sidebar.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/agents/workspace-agent-sidebar.svelte
rename to apps/studio-ui/src/lib/components/agents/workspace-agent-sidebar.svelte
diff --git a/apps/studio-ui/src/lib/components/chat/__snapshots__/validation-pill-row.test.ts.snap b/apps/studio-ui/src/lib/components/chat/__snapshots__/validation-pill-row.test.ts.snap
new file mode 100644
index 000000000..1dc45e574
--- /dev/null
+++ b/apps/studio-ui/src/lib/components/chat/__snapshots__/validation-pill-row.test.ts.snap
@@ -0,0 +1,11 @@
+// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
+
+exports[`ValidationPillRow > failed-retrying: snapshot 1`] = `"<!--[--><div class="validation-pill svelte-1syb52q tone-red expanded" data-lifecycle="failed-retrying"><!--[0--><button type="button" class="pill-header svelte-1syb52q" aria-expanded="true"><span class="status-icon svelte-1syb52q" aria-hidden="true"><!--[-1--><!--[--><svg></svg><!--]--><!--]--></span> <span class="pill-headline svelte-1syb52q">Validation failed — retrying</span> <span class="attempt-tag svelte-1syb52q">attempt 1</span> <!--[-1--><!--]--> <span class="pill-spacer svelte-1syb52q"></span> <!--[0--><span class="pill-chevron svelte-1syb52q" aria-hidden="true"><!--[0--><!--[--><svg></svg><!--]--><!--]--></span><!--]--><!----></button><!--]--> <!--[0--><div class="pill-body svelte-1syb52q"><!--[-1--><!--]--> <!--[0--><ul class="issue-list svelte-1syb52q"><!--[--><li class="issue-row svelte-1syb52q sev-red"><div class="issue-head svelte-1syb52q"><span class="category-badge svelte-1syb52q">sourcing</span> <span class="severity-badge svelte-1syb52q">error</span></div> <!--[0--><div class="issue-field svelte-1syb52q"><span class="body-label svelte-1syb52q">Claim</span> <p class="body-text svelte-1syb52q">Pricing for the Acme Pro plan is $29/mo</p></div><!--]--> <!--[0--><div class="issue-field svelte-1syb52q"><span class="body-label svelte-1syb52q">Reasoning</span> <p class="body-text svelte-1syb52q">No tool result contains pricing for Acme Pro.</p></div><!--]--> <div class="issue-field svelte-1syb52q"><span class="body-label svelte-1syb52q">Citation</span> <p class="body-text citation svelte-1syb52q">Plans: Free, Team. Contact sales for enterprise.</p></div></li><li class="issue-row svelte-1syb52q sev-yellow"><div class="issue-head svelte-1syb52q"><span class="category-badge svelte-1syb52q">no-tools-called</span> <span class="severity-badge svelte-1syb52q">warn</span></div> <!--[0--><div class="issue-field svelte-1syb52q"><span class="body-label svelte-1syb52q">Claim</span> <p class="body-text svelte-1syb52q">User has 12 unread emails</p></div><!--]--> <!--[0--><div class="issue-field svelte-1syb52q"><span class="body-label svelte-1syb52q">Reasoning</span> <p class="body-text svelte-1syb52q">Agent did not call any inbox tool before claiming this.</p></div><!--]--> <div class="issue-field svelte-1syb52q"><span class="body-label svelte-1syb52q">Citation</span> <p class="body-text citation svelte-1syb52q citation-empty">(no supporting tool call)</p></div></li><!--]--></ul><!--]--></div><!--]--></div><!--]-->"`;
+
+exports[`ValidationPillRow > failed-terminal: snapshot 1`] = `"<!--[--><div class="validation-pill svelte-1syb52q tone-red expanded" data-lifecycle="failed-terminal"><!--[0--><button type="button" class="pill-header svelte-1syb52q" aria-expanded="true"><span class="status-icon svelte-1syb52q" aria-hidden="true"><!--[-1--><!--[--><svg></svg><!--]--><!--]--></span> <span class="pill-headline svelte-1syb52q">Validation failed</span> <span class="attempt-tag svelte-1syb52q">attempt 2</span> <!--[-1--><!--]--> <span class="pill-spacer svelte-1syb52q"></span> <!--[0--><span class="pill-chevron svelte-1syb52q" aria-hidden="true"><!--[0--><!--[--><svg></svg><!--]--><!--]--></span><!--]--><!----></button><!--]--> <!--[0--><div class="pill-body svelte-1syb52q"><!--[-1--><!--]--> <!--[0--><ul class="issue-list svelte-1syb52q"><!--[--><li class="issue-row svelte-1syb52q sev-red"><div class="issue-head svelte-1syb52q"><span class="category-badge svelte-1syb52q">sourcing</span> <span class="severity-badge svelte-1syb52q">error</span></div> <!--[0--><div class="issue-field svelte-1syb52q"><span class="body-label svelte-1syb52q">Claim</span> <p class="body-text svelte-1syb52q">Pricing for the Acme Pro plan is $29/mo</p></div><!--]--> <!--[0--><div class="issue-field svelte-1syb52q"><span class="body-label svelte-1syb52q">Reasoning</span> <p class="body-text svelte-1syb52q">No tool result contains pricing for Acme Pro.</p></div><!--]--> <div class="issue-field svelte-1syb52q"><span class="body-label svelte-1syb52q">Citation</span> <p class="body-text citation svelte-1syb52q">Plans: Free, Team. Contact sales for enterprise.</p></div></li><li class="issue-row svelte-1syb52q sev-yellow"><div class="issue-head svelte-1syb52q"><span class="category-badge svelte-1syb52q">no-tools-called</span> <span class="severity-badge svelte-1syb52q">warn</span></div> <!--[0--><div class="issue-field svelte-1syb52q"><span class="body-label svelte-1syb52q">Claim</span> <p class="body-text svelte-1syb52q">User has 12 unread emails</p></div><!--]--> <!--[0--><div class="issue-field svelte-1syb52q"><span class="body-label svelte-1syb52q">Reasoning</span> <p class="body-text svelte-1syb52q">Agent did not call any inbox tool before claiming this.</p></div><!--]--> <div class="issue-field svelte-1syb52q"><span class="body-label svelte-1syb52q">Citation</span> <p class="body-text citation svelte-1syb52q citation-empty">(no supporting tool call)</p></div></li><!--]--></ul><!--]--></div><!--]--></div><!--]-->"`;
+
+exports[`ValidationPillRow > passed-from-pass: snapshot 1`] = `"<!--[--><div class="validation-pill svelte-1syb52q tone-green" data-lifecycle="passed-from-pass"><!--[0--><button type="button" class="pill-header svelte-1syb52q" aria-expanded="false"><span class="status-icon svelte-1syb52q" aria-hidden="true"><!--[1--><!--[--><svg></svg><!--]--><!--]--></span> <span class="pill-headline svelte-1syb52q">Validation passed</span> <span class="attempt-tag svelte-1syb52q">attempt 1</span> <!--[-1--><!--]--> <span class="pill-spacer svelte-1syb52q"></span> <!--[0--><span class="pill-chevron svelte-1syb52q" aria-hidden="true"><!--[-1--><!--[--><svg></svg><!--]--><!--]--></span><!--]--><!----></button><!--]--> <!--[-1--><!--]--></div><!--]-->"`;
+
+exports[`ValidationPillRow > passed-from-uncertain: snapshot 1`] = `"<!--[--><div class="validation-pill svelte-1syb52q tone-yellow" data-lifecycle="passed-from-uncertain"><!--[0--><button type="button" class="pill-header svelte-1syb52q" aria-expanded="false"><span class="status-icon svelte-1syb52q" aria-hidden="true"><!--[2--><!--[--><svg></svg><!--]--><!--]--></span> <span class="pill-headline svelte-1syb52q">Validation uncertain</span> <span class="attempt-tag svelte-1syb52q">attempt 1</span> <!--[-1--><!--]--> <span class="pill-spacer svelte-1syb52q"></span> <!--[0--><span class="pill-chevron svelte-1syb52q" aria-hidden="true"><!--[-1--><!--[--><svg></svg><!--]--><!--]--></span><!--]--><!----></button><!--]--> <!--[-1--><!--]--></div><!--]-->"`;
+
+exports[`ValidationPillRow > running: snapshot 1`] = `"<!--[--><div class="validation-pill svelte-1syb52q tone-blue" data-lifecycle="running"><!--[-1--><div class="pill-header non-interactive svelte-1syb52q"><span class="status-icon svelte-1syb52q" aria-hidden="true"><!--[0--><span class="spinner-dot svelte-1syb52q"></span><!--]--></span> <span class="pill-headline svelte-1syb52q">Validating output</span> <span class="attempt-tag svelte-1syb52q">attempt 1</span> <!--[-1--><!--]--> <span class="pill-spacer svelte-1syb52q"></span> <!--[-1--><!--]--><!----></div><!--]--> <!--[-1--><!--]--></div><!--]-->"`;
diff --git a/tools/agent-playground/src/lib/components/chat/__test-stubs__/artifact-card-export-parent.svelte b/apps/studio-ui/src/lib/components/chat/__test-stubs__/artifact-card-export-parent.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/__test-stubs__/artifact-card-export-parent.svelte
rename to apps/studio-ui/src/lib/components/chat/__test-stubs__/artifact-card-export-parent.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/__test-stubs__/icon-stub.svelte b/apps/studio-ui/src/lib/components/chat/__test-stubs__/icon-stub.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/__test-stubs__/icon-stub.svelte
rename to apps/studio-ui/src/lib/components/chat/__test-stubs__/icon-stub.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/__test-stubs__/tool-call-card-export-parent.svelte b/apps/studio-ui/src/lib/components/chat/__test-stubs__/tool-call-card-export-parent.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/__test-stubs__/tool-call-card-export-parent.svelte
rename to apps/studio-ui/src/lib/components/chat/__test-stubs__/tool-call-card-export-parent.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/artifact-card.svelte b/apps/studio-ui/src/lib/components/chat/artifact-card.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/artifact-card.svelte
rename to apps/studio-ui/src/lib/components/chat/artifact-card.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/artifact-card.test.ts b/apps/studio-ui/src/lib/components/chat/artifact-card.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/artifact-card.test.ts
rename to apps/studio-ui/src/lib/components/chat/artifact-card.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/byte-stability.test.ts b/apps/studio-ui/src/lib/components/chat/byte-stability.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/byte-stability.test.ts
rename to apps/studio-ui/src/lib/components/chat/byte-stability.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/byte-stability.ts b/apps/studio-ui/src/lib/components/chat/byte-stability.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/byte-stability.ts
rename to apps/studio-ui/src/lib/components/chat/byte-stability.ts
diff --git a/tools/agent-playground/src/lib/components/chat/chat-input.svelte b/apps/studio-ui/src/lib/components/chat/chat-input.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/chat-input.svelte
rename to apps/studio-ui/src/lib/components/chat/chat-input.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/chat-inspector.svelte b/apps/studio-ui/src/lib/components/chat/chat-inspector.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/chat-inspector.svelte
rename to apps/studio-ui/src/lib/components/chat/chat-inspector.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/chat-list-panel.svelte b/apps/studio-ui/src/lib/components/chat/chat-list-panel.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/chat-list-panel.svelte
rename to apps/studio-ui/src/lib/components/chat/chat-list-panel.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/chat-message-list.svelte b/apps/studio-ui/src/lib/components/chat/chat-message-list.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/chat-message-list.svelte
rename to apps/studio-ui/src/lib/components/chat/chat-message-list.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/chat-queue.test.ts b/apps/studio-ui/src/lib/components/chat/chat-queue.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/chat-queue.test.ts
rename to apps/studio-ui/src/lib/components/chat/chat-queue.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/chat-queue.ts b/apps/studio-ui/src/lib/components/chat/chat-queue.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/chat-queue.ts
rename to apps/studio-ui/src/lib/components/chat/chat-queue.ts
diff --git a/tools/agent-playground/src/lib/components/chat/chat-session-usage.svelte b/apps/studio-ui/src/lib/components/chat/chat-session-usage.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/chat-session-usage.svelte
rename to apps/studio-ui/src/lib/components/chat/chat-session-usage.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/chat-tts.test.ts b/apps/studio-ui/src/lib/components/chat/chat-tts.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/chat-tts.test.ts
rename to apps/studio-ui/src/lib/components/chat/chat-tts.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/chat-tts.ts b/apps/studio-ui/src/lib/components/chat/chat-tts.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/chat-tts.ts
rename to apps/studio-ui/src/lib/components/chat/chat-tts.ts
diff --git a/tools/agent-playground/src/lib/components/chat/connect-communicator.svelte b/apps/studio-ui/src/lib/components/chat/connect-communicator.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/connect-communicator.svelte
rename to apps/studio-ui/src/lib/components/chat/connect-communicator.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/connect-service.svelte b/apps/studio-ui/src/lib/components/chat/connect-service.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/connect-service.svelte
rename to apps/studio-ui/src/lib/components/chat/connect-service.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/copy-buttons-export.test.ts b/apps/studio-ui/src/lib/components/chat/copy-buttons-export.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/copy-buttons-export.test.ts
rename to apps/studio-ui/src/lib/components/chat/copy-buttons-export.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/cursor-tracking-fetch.test.ts b/apps/studio-ui/src/lib/components/chat/cursor-tracking-fetch.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/cursor-tracking-fetch.test.ts
rename to apps/studio-ui/src/lib/components/chat/cursor-tracking-fetch.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/cursor-tracking-fetch.ts b/apps/studio-ui/src/lib/components/chat/cursor-tracking-fetch.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/cursor-tracking-fetch.ts
rename to apps/studio-ui/src/lib/components/chat/cursor-tracking-fetch.ts
diff --git a/tools/agent-playground/src/lib/components/chat/delegate-tool-card.svelte b/apps/studio-ui/src/lib/components/chat/delegate-tool-card.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/delegate-tool-card.svelte
rename to apps/studio-ui/src/lib/components/chat/delegate-tool-card.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/export-context.ts b/apps/studio-ui/src/lib/components/chat/export-context.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/export-context.ts
rename to apps/studio-ui/src/lib/components/chat/export-context.ts
diff --git a/tools/agent-playground/src/lib/components/chat/human-input-matcher.test.ts b/apps/studio-ui/src/lib/components/chat/human-input-matcher.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/human-input-matcher.test.ts
rename to apps/studio-ui/src/lib/components/chat/human-input-matcher.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/human-input-matcher.ts b/apps/studio-ui/src/lib/components/chat/human-input-matcher.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/human-input-matcher.ts
rename to apps/studio-ui/src/lib/components/chat/human-input-matcher.ts
diff --git a/tools/agent-playground/src/lib/components/chat/human-input-tool-card.svelte b/apps/studio-ui/src/lib/components/chat/human-input-tool-card.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/human-input-tool-card.svelte
rename to apps/studio-ui/src/lib/components/chat/human-input-tool-card.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/json-highlighter.ts b/apps/studio-ui/src/lib/components/chat/json-highlighter.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/json-highlighter.ts
rename to apps/studio-ui/src/lib/components/chat/json-highlighter.ts
diff --git a/tools/agent-playground/src/lib/components/chat/lifted-markers.test.ts b/apps/studio-ui/src/lib/components/chat/lifted-markers.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/lifted-markers.test.ts
rename to apps/studio-ui/src/lib/components/chat/lifted-markers.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/lifted-markers.ts b/apps/studio-ui/src/lib/components/chat/lifted-markers.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/lifted-markers.ts
rename to apps/studio-ui/src/lib/components/chat/lifted-markers.ts
diff --git a/tools/agent-playground/src/lib/components/chat/markdown-body.svelte b/apps/studio-ui/src/lib/components/chat/markdown-body.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/markdown-body.svelte
rename to apps/studio-ui/src/lib/components/chat/markdown-body.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/message-error.test.ts b/apps/studio-ui/src/lib/components/chat/message-error.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/message-error.test.ts
rename to apps/studio-ui/src/lib/components/chat/message-error.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/message-error.ts b/apps/studio-ui/src/lib/components/chat/message-error.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/message-error.ts
rename to apps/studio-ui/src/lib/components/chat/message-error.ts
diff --git a/tools/agent-playground/src/lib/components/chat/resume-budget.test.ts b/apps/studio-ui/src/lib/components/chat/resume-budget.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/resume-budget.test.ts
rename to apps/studio-ui/src/lib/components/chat/resume-budget.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/resume-budget.ts b/apps/studio-ui/src/lib/components/chat/resume-budget.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/resume-budget.ts
rename to apps/studio-ui/src/lib/components/chat/resume-budget.ts
diff --git a/tools/agent-playground/src/lib/components/chat/snapshot-table.test.ts b/apps/studio-ui/src/lib/components/chat/snapshot-table.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/snapshot-table.test.ts
rename to apps/studio-ui/src/lib/components/chat/snapshot-table.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/snapshot-table.ts b/apps/studio-ui/src/lib/components/chat/snapshot-table.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/snapshot-table.ts
rename to apps/studio-ui/src/lib/components/chat/snapshot-table.ts
diff --git a/tools/agent-playground/src/lib/components/chat/speech-recognition.d.ts b/apps/studio-ui/src/lib/components/chat/speech-recognition.d.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/speech-recognition.d.ts
rename to apps/studio-ui/src/lib/components/chat/speech-recognition.d.ts
diff --git a/tools/agent-playground/src/lib/components/chat/table-action-helpers.ts b/apps/studio-ui/src/lib/components/chat/table-action-helpers.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/table-action-helpers.ts
rename to apps/studio-ui/src/lib/components/chat/table-action-helpers.ts
diff --git a/tools/agent-playground/src/lib/components/chat/table-actions-bar.svelte b/apps/studio-ui/src/lib/components/chat/table-actions-bar.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/table-actions-bar.svelte
rename to apps/studio-ui/src/lib/components/chat/table-actions-bar.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/table-parsers.test.ts b/apps/studio-ui/src/lib/components/chat/table-parsers.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/table-parsers.test.ts
rename to apps/studio-ui/src/lib/components/chat/table-parsers.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/table-parsers.ts b/apps/studio-ui/src/lib/components/chat/table-parsers.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/table-parsers.ts
rename to apps/studio-ui/src/lib/components/chat/table-parsers.ts
diff --git a/tools/agent-playground/src/lib/components/chat/table-to-csv.test.ts b/apps/studio-ui/src/lib/components/chat/table-to-csv.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/table-to-csv.test.ts
rename to apps/studio-ui/src/lib/components/chat/table-to-csv.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/table-to-csv.ts b/apps/studio-ui/src/lib/components/chat/table-to-csv.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/table-to-csv.ts
rename to apps/studio-ui/src/lib/components/chat/table-to-csv.ts
diff --git a/tools/agent-playground/src/lib/components/chat/table-to-html.test.ts b/apps/studio-ui/src/lib/components/chat/table-to-html.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/table-to-html.test.ts
rename to apps/studio-ui/src/lib/components/chat/table-to-html.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/table-to-html.ts b/apps/studio-ui/src/lib/components/chat/table-to-html.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/table-to-html.ts
rename to apps/studio-ui/src/lib/components/chat/table-to-html.ts
diff --git a/tools/agent-playground/src/lib/components/chat/table-to-markdown.test.ts b/apps/studio-ui/src/lib/components/chat/table-to-markdown.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/table-to-markdown.test.ts
rename to apps/studio-ui/src/lib/components/chat/table-to-markdown.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/table-to-markdown.ts b/apps/studio-ui/src/lib/components/chat/table-to-markdown.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/table-to-markdown.ts
rename to apps/studio-ui/src/lib/components/chat/table-to-markdown.ts
diff --git a/tools/agent-playground/src/lib/components/chat/table-view.svelte b/apps/studio-ui/src/lib/components/chat/table-view.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/table-view.svelte
rename to apps/studio-ui/src/lib/components/chat/table-view.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/tool-burst.svelte b/apps/studio-ui/src/lib/components/chat/tool-burst.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/tool-burst.svelte
rename to apps/studio-ui/src/lib/components/chat/tool-burst.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/tool-call-card.svelte b/apps/studio-ui/src/lib/components/chat/tool-call-card.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/tool-call-card.svelte
rename to apps/studio-ui/src/lib/components/chat/tool-call-card.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/tool-call-utils.test.ts b/apps/studio-ui/src/lib/components/chat/tool-call-utils.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/tool-call-utils.test.ts
rename to apps/studio-ui/src/lib/components/chat/tool-call-utils.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/tool-call-utils.ts b/apps/studio-ui/src/lib/components/chat/tool-call-utils.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/tool-call-utils.ts
rename to apps/studio-ui/src/lib/components/chat/tool-call-utils.ts
diff --git a/tools/agent-playground/src/lib/components/chat/types.ts b/apps/studio-ui/src/lib/components/chat/types.ts
similarity index 98%
rename from tools/agent-playground/src/lib/components/chat/types.ts
rename to apps/studio-ui/src/lib/components/chat/types.ts
index ad319d51b..4a3c039d5 100644
--- a/tools/agent-playground/src/lib/components/chat/types.ts
+++ b/apps/studio-ui/src/lib/components/chat/types.ts
@@ -19,7 +19,7 @@ import { z } from "zod";
 /**
  * Render-shape types live in `@atlas/core/chat/export/render` so the chat
  * export route in `apps/atlasd` can reuse them. Re-exported here so existing
- * agent-playground imports continue to resolve.
+ * studio-ui imports continue to resolve.
  */
 import type {
   ImageDisplay,
diff --git a/tools/agent-playground/src/lib/components/chat/usage-badge.svelte b/apps/studio-ui/src/lib/components/chat/usage-badge.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/usage-badge.svelte
rename to apps/studio-ui/src/lib/components/chat/usage-badge.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/user-chat.svelte b/apps/studio-ui/src/lib/components/chat/user-chat.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/user-chat.svelte
rename to apps/studio-ui/src/lib/components/chat/user-chat.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/validation-accumulator.test.ts b/apps/studio-ui/src/lib/components/chat/validation-accumulator.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/validation-accumulator.test.ts
rename to apps/studio-ui/src/lib/components/chat/validation-accumulator.test.ts
diff --git a/tools/agent-playground/src/lib/components/chat/validation-accumulator.ts b/apps/studio-ui/src/lib/components/chat/validation-accumulator.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/validation-accumulator.ts
rename to apps/studio-ui/src/lib/components/chat/validation-accumulator.ts
diff --git a/tools/agent-playground/src/lib/components/chat/validation-pill-row.svelte b/apps/studio-ui/src/lib/components/chat/validation-pill-row.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/validation-pill-row.svelte
rename to apps/studio-ui/src/lib/components/chat/validation-pill-row.svelte
diff --git a/tools/agent-playground/src/lib/components/chat/validation-pill-row.test.ts b/apps/studio-ui/src/lib/components/chat/validation-pill-row.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/chat/validation-pill-row.test.ts
rename to apps/studio-ui/src/lib/components/chat/validation-pill-row.test.ts
diff --git a/tools/agent-playground/src/lib/components/credential-secret-form.svelte b/apps/studio-ui/src/lib/components/credential-secret-form.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/credential-secret-form.svelte
rename to apps/studio-ui/src/lib/components/credential-secret-form.svelte
diff --git a/tools/agent-playground/src/lib/components/execution/execution-stream.svelte b/apps/studio-ui/src/lib/components/execution/execution-stream.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/execution/execution-stream.svelte
rename to apps/studio-ui/src/lib/components/execution/execution-stream.svelte
diff --git a/tools/agent-playground/src/lib/components/inspector/agent-inspection-panel.svelte b/apps/studio-ui/src/lib/components/inspector/agent-inspection-panel.svelte
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diff --git a/tools/agent-playground/src/lib/components/inspector/inspector-recent-sessions.svelte b/apps/studio-ui/src/lib/components/inspector/inspector-recent-sessions.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/inspector/inspector-recent-sessions.svelte
rename to apps/studio-ui/src/lib/components/inspector/inspector-recent-sessions.svelte
diff --git a/tools/agent-playground/src/lib/components/inspector/inspector-run-card.svelte b/apps/studio-ui/src/lib/components/inspector/inspector-run-card.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/inspector/inspector-run-card.svelte
rename to apps/studio-ui/src/lib/components/inspector/inspector-run-card.svelte
diff --git a/tools/agent-playground/src/lib/components/inspector/inspector-session-sidebar.svelte b/apps/studio-ui/src/lib/components/inspector/inspector-session-sidebar.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/inspector/inspector-session-sidebar.svelte
rename to apps/studio-ui/src/lib/components/inspector/inspector-session-sidebar.svelte
diff --git a/tools/agent-playground/src/lib/components/inspector/inspector-workspace-picker.svelte b/apps/studio-ui/src/lib/components/inspector/inspector-workspace-picker.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/inspector/inspector-workspace-picker.svelte
rename to apps/studio-ui/src/lib/components/inspector/inspector-workspace-picker.svelte
diff --git a/tools/agent-playground/src/lib/components/inspector/waterfall-layout.test.ts b/apps/studio-ui/src/lib/components/inspector/waterfall-layout.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/inspector/waterfall-layout.test.ts
rename to apps/studio-ui/src/lib/components/inspector/waterfall-layout.test.ts
diff --git a/tools/agent-playground/src/lib/components/inspector/waterfall-layout.ts b/apps/studio-ui/src/lib/components/inspector/waterfall-layout.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/inspector/waterfall-layout.ts
rename to apps/studio-ui/src/lib/components/inspector/waterfall-layout.ts
diff --git a/tools/agent-playground/src/lib/components/inspector/waterfall-timeline.svelte b/apps/studio-ui/src/lib/components/inspector/waterfall-timeline.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/inspector/waterfall-timeline.svelte
rename to apps/studio-ui/src/lib/components/inspector/waterfall-timeline.svelte
diff --git a/tools/agent-playground/src/lib/components/mcp/mcp-catalog-tree.svelte b/apps/studio-ui/src/lib/components/mcp/mcp-catalog-tree.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/mcp/mcp-catalog-tree.svelte
rename to apps/studio-ui/src/lib/components/mcp/mcp-catalog-tree.svelte
diff --git a/tools/agent-playground/src/lib/components/mcp/mcp-connection-test.svelte b/apps/studio-ui/src/lib/components/mcp/mcp-connection-test.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/mcp/mcp-connection-test.svelte
rename to apps/studio-ui/src/lib/components/mcp/mcp-connection-test.svelte
diff --git a/tools/agent-playground/src/lib/components/mcp/mcp-credentials-list.svelte b/apps/studio-ui/src/lib/components/mcp/mcp-credentials-list.svelte
similarity index 100%
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rename to apps/studio-ui/src/lib/components/mcp/mcp-credentials-list.svelte
diff --git a/tools/agent-playground/src/lib/components/mcp/mcp-credentials-panel.svelte b/apps/studio-ui/src/lib/components/mcp/mcp-credentials-panel.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/mcp/mcp-credentials-panel.svelte
rename to apps/studio-ui/src/lib/components/mcp/mcp-credentials-panel.svelte
diff --git a/tools/agent-playground/src/lib/components/mcp/mcp-registry-import.svelte b/apps/studio-ui/src/lib/components/mcp/mcp-registry-import.svelte
similarity index 100%
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rename to apps/studio-ui/src/lib/components/mcp/mcp-registry-import.svelte
diff --git a/tools/agent-playground/src/lib/components/mcp/mcp-server-detail.svelte b/apps/studio-ui/src/lib/components/mcp/mcp-server-detail.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/mcp/mcp-server-detail.svelte
rename to apps/studio-ui/src/lib/components/mcp/mcp-server-detail.svelte
diff --git a/tools/agent-playground/src/lib/components/mcp/mcp-server-utils.ts b/apps/studio-ui/src/lib/components/mcp/mcp-server-utils.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/mcp/mcp-server-utils.ts
rename to apps/studio-ui/src/lib/components/mcp/mcp-server-utils.ts
diff --git a/tools/agent-playground/src/lib/components/mcp/mcp-test-chat.svelte b/apps/studio-ui/src/lib/components/mcp/mcp-test-chat.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/mcp/mcp-test-chat.svelte
rename to apps/studio-ui/src/lib/components/mcp/mcp-test-chat.svelte
diff --git a/tools/agent-playground/src/lib/components/mcp/mcp-workspace-usage.svelte b/apps/studio-ui/src/lib/components/mcp/mcp-workspace-usage.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/mcp/mcp-workspace-usage.svelte
rename to apps/studio-ui/src/lib/components/mcp/mcp-workspace-usage.svelte
diff --git a/tools/agent-playground/src/lib/components/session/agent-block-card.svelte b/apps/studio-ui/src/lib/components/session/agent-block-card.svelte
similarity index 100%
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rename to apps/studio-ui/src/lib/components/session/agent-block-card.svelte
diff --git a/tools/agent-playground/src/lib/components/session/index.ts b/apps/studio-ui/src/lib/components/session/index.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/session/index.ts
rename to apps/studio-ui/src/lib/components/session/index.ts
diff --git a/tools/agent-playground/src/lib/components/session/parse-error.ts b/apps/studio-ui/src/lib/components/session/parse-error.ts
similarity index 100%
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rename to apps/studio-ui/src/lib/components/session/parse-error.ts
diff --git a/tools/agent-playground/src/lib/components/session/recent-sessions.svelte b/apps/studio-ui/src/lib/components/session/recent-sessions.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/session/recent-sessions.svelte
rename to apps/studio-ui/src/lib/components/session/recent-sessions.svelte
diff --git a/tools/agent-playground/src/lib/components/session/session-progress-card.svelte b/apps/studio-ui/src/lib/components/session/session-progress-card.svelte
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rename from tools/agent-playground/src/lib/components/session/session-progress-card.svelte
rename to apps/studio-ui/src/lib/components/session/session-progress-card.svelte
diff --git a/tools/agent-playground/src/lib/components/session/step-block/header.svelte b/apps/studio-ui/src/lib/components/session/step-block/header.svelte
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rename to apps/studio-ui/src/lib/components/session/step-block/header.svelte
diff --git a/tools/agent-playground/src/lib/components/session/step-block/index.ts b/apps/studio-ui/src/lib/components/session/step-block/index.ts
similarity index 100%
rename from tools/agent-playground/src/lib/components/session/step-block/index.ts
rename to apps/studio-ui/src/lib/components/session/step-block/index.ts
diff --git a/tools/agent-playground/src/lib/components/session/step-block/root.svelte b/apps/studio-ui/src/lib/components/session/step-block/root.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/session/step-block/root.svelte
rename to apps/studio-ui/src/lib/components/session/step-block/root.svelte
diff --git a/tools/agent-playground/src/lib/components/session/tool-call-data.svelte b/apps/studio-ui/src/lib/components/session/tool-call-data.svelte
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diff --git a/tools/agent-playground/src/lib/components/settings/model-chain.svelte b/apps/studio-ui/src/lib/components/settings/model-chain.svelte
similarity index 100%
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diff --git a/tools/agent-playground/src/lib/components/settings/provider-mark.svelte b/apps/studio-ui/src/lib/components/settings/provider-mark.svelte
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diff --git a/tools/agent-playground/src/lib/components/shared/artifact-upload.svelte b/apps/studio-ui/src/lib/components/shared/artifact-upload.svelte
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similarity index 100%
rename from tools/agent-playground/src/lib/components/skills/skill-loader.svelte
rename to apps/studio-ui/src/lib/components/skills/skill-loader.svelte
diff --git a/tools/agent-playground/src/lib/components/skills/skills-sh-import.svelte b/apps/studio-ui/src/lib/components/skills/skills-sh-import.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/skills/skills-sh-import.svelte
rename to apps/studio-ui/src/lib/components/skills/skills-sh-import.svelte
diff --git a/tools/agent-playground/src/lib/components/skills/skills-tree.svelte b/apps/studio-ui/src/lib/components/skills/skills-tree.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/skills/skills-tree.svelte
rename to apps/studio-ui/src/lib/components/skills/skills-tree.svelte
diff --git a/tools/agent-playground/src/lib/components/skills/version-compare-dialog.svelte b/apps/studio-ui/src/lib/components/skills/version-compare-dialog.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/skills/version-compare-dialog.svelte
rename to apps/studio-ui/src/lib/components/skills/version-compare-dialog.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/cockpit-view.svelte b/apps/studio-ui/src/lib/components/workspace/cockpit-view.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/cockpit-view.svelte
rename to apps/studio-ui/src/lib/components/workspace/cockpit-view.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/communicators-card.svelte b/apps/studio-ui/src/lib/components/workspace/communicators-card.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/communicators-card.svelte
rename to apps/studio-ui/src/lib/components/workspace/communicators-card.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/create-workspace-form.svelte b/apps/studio-ui/src/lib/components/workspace/create-workspace-form.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/create-workspace-form.svelte
rename to apps/studio-ui/src/lib/components/workspace/create-workspace-form.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/integrations-sidebar.svelte b/apps/studio-ui/src/lib/components/workspace/integrations-sidebar.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/integrations-sidebar.svelte
rename to apps/studio-ui/src/lib/components/workspace/integrations-sidebar.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/job-index-sidebar.svelte b/apps/studio-ui/src/lib/components/workspace/job-index-sidebar.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/job-index-sidebar.svelte
rename to apps/studio-ui/src/lib/components/workspace/job-index-sidebar.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/job-selector.svelte b/apps/studio-ui/src/lib/components/workspace/job-selector.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/job-selector.svelte
rename to apps/studio-ui/src/lib/components/workspace/job-selector.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/jobs-card-row.svelte b/apps/studio-ui/src/lib/components/workspace/jobs-card-row.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/jobs-card-row.svelte
rename to apps/studio-ui/src/lib/components/workspace/jobs-card-row.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/jobs-integrations-card.svelte b/apps/studio-ui/src/lib/components/workspace/jobs-integrations-card.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/jobs-integrations-card.svelte
rename to apps/studio-ui/src/lib/components/workspace/jobs-integrations-card.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/pipeline-diagram.svelte b/apps/studio-ui/src/lib/components/workspace/pipeline-diagram.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/pipeline-diagram.svelte
rename to apps/studio-ui/src/lib/components/workspace/pipeline-diagram.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/run-card.svelte b/apps/studio-ui/src/lib/components/workspace/run-card.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/run-card.svelte
rename to apps/studio-ui/src/lib/components/workspace/run-card.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/run-job-dialog.svelte b/apps/studio-ui/src/lib/components/workspace/run-job-dialog.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/run-job-dialog.svelte
rename to apps/studio-ui/src/lib/components/workspace/run-job-dialog.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/signal-input-form.svelte b/apps/studio-ui/src/lib/components/workspace/signal-input-form.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/signal-input-form.svelte
rename to apps/studio-ui/src/lib/components/workspace/signal-input-form.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/signal-row.svelte b/apps/studio-ui/src/lib/components/workspace/signal-row.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/signal-row.svelte
rename to apps/studio-ui/src/lib/components/workspace/signal-row.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/signal-sidebar.svelte b/apps/studio-ui/src/lib/components/workspace/signal-sidebar.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/signal-sidebar.svelte
rename to apps/studio-ui/src/lib/components/workspace/signal-sidebar.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/signals-card.svelte b/apps/studio-ui/src/lib/components/workspace/signals-card.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/signals-card.svelte
rename to apps/studio-ui/src/lib/components/workspace/signals-card.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/signals-panel.svelte b/apps/studio-ui/src/lib/components/workspace/signals-panel.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/signals-panel.svelte
rename to apps/studio-ui/src/lib/components/workspace/signals-panel.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/workspace-breadcrumb.svelte b/apps/studio-ui/src/lib/components/workspace/workspace-breadcrumb.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/workspace-breadcrumb.svelte
rename to apps/studio-ui/src/lib/components/workspace/workspace-breadcrumb.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/workspace-dropdown.svelte b/apps/studio-ui/src/lib/components/workspace/workspace-dropdown.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/workspace-dropdown.svelte
rename to apps/studio-ui/src/lib/components/workspace/workspace-dropdown.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/workspace-job-selector.svelte b/apps/studio-ui/src/lib/components/workspace/workspace-job-selector.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/workspace-job-selector.svelte
rename to apps/studio-ui/src/lib/components/workspace/workspace-job-selector.svelte
diff --git a/tools/agent-playground/src/lib/components/workspace/workspace-loader.svelte b/apps/studio-ui/src/lib/components/workspace/workspace-loader.svelte
similarity index 100%
rename from tools/agent-playground/src/lib/components/workspace/workspace-loader.svelte
rename to apps/studio-ui/src/lib/components/workspace/workspace-loader.svelte
diff --git a/tools/agent-playground/src/lib/contract-checker.test.ts b/apps/studio-ui/src/lib/contract-checker.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/contract-checker.test.ts
rename to apps/studio-ui/src/lib/contract-checker.test.ts
diff --git a/tools/agent-playground/src/lib/contract-checker.ts b/apps/studio-ui/src/lib/contract-checker.ts
similarity index 100%
rename from tools/agent-playground/src/lib/contract-checker.ts
rename to apps/studio-ui/src/lib/contract-checker.ts
diff --git a/tools/agent-playground/src/lib/cron-humanize.test.ts b/apps/studio-ui/src/lib/cron-humanize.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/cron-humanize.test.ts
rename to apps/studio-ui/src/lib/cron-humanize.test.ts
diff --git a/tools/agent-playground/src/lib/cron-humanize.ts b/apps/studio-ui/src/lib/cron-humanize.ts
similarity index 100%
rename from tools/agent-playground/src/lib/cron-humanize.ts
rename to apps/studio-ui/src/lib/cron-humanize.ts
diff --git a/tools/agent-playground/src/lib/daemon-client.ts b/apps/studio-ui/src/lib/daemon-client.ts
similarity index 100%
rename from tools/agent-playground/src/lib/daemon-client.ts
rename to apps/studio-ui/src/lib/daemon-client.ts
diff --git a/tools/agent-playground/src/lib/daemon-health.svelte.ts b/apps/studio-ui/src/lib/daemon-health.svelte.ts
similarity index 100%
rename from tools/agent-playground/src/lib/daemon-health.svelte.ts
rename to apps/studio-ui/src/lib/daemon-health.svelte.ts
diff --git a/tools/agent-playground/src/lib/daemon-url.ts b/apps/studio-ui/src/lib/daemon-url.ts
similarity index 91%
rename from tools/agent-playground/src/lib/daemon-url.ts
rename to apps/studio-ui/src/lib/daemon-url.ts
index ea8dcfb4d..d1271625a 100644
--- a/tools/agent-playground/src/lib/daemon-url.ts
+++ b/apps/studio-ui/src/lib/daemon-url.ts
@@ -4,7 +4,7 @@ import { z } from "zod";
  * (`/api/daemon/*` route). The compiled binary uses static-server.ts
  * which reads `FRIDAYD_URL` from env for the same purpose; this dev
  * path always targets the default 8080 since it only runs under
- * `deno task playground`. */
+ * `deno task studio-ui`. */
 export const DAEMON_BASE_URL = "http://localhost:8080";
 
 interface RuntimeConfig {
@@ -40,8 +40,8 @@ function resolve(configKey: keyof RuntimeConfig, envVarName: string, humanName:
 	const value = globalThis.__FRIDAY_CONFIG__?.[configKey];
 	if (!value) {
 		throw new Error(
-			`${humanName} is not configured. Set ${envVarName} on the playground process ` +
-				`(launcher .env in production; deno.json playground task in dev).`,
+			`${humanName} is not configured. Set ${envVarName} on the studio-ui process ` +
+				`(launcher .env in production; deno.json studio-ui task in dev).`,
 		);
 	}
 	return normalize(value);
diff --git a/tools/agent-playground/src/lib/editor/atlas-theme.ts b/apps/studio-ui/src/lib/editor/atlas-theme.ts
similarity index 100%
rename from tools/agent-playground/src/lib/editor/atlas-theme.ts
rename to apps/studio-ui/src/lib/editor/atlas-theme.ts
diff --git a/tools/agent-playground/src/lib/elicitation-counts.test.ts b/apps/studio-ui/src/lib/elicitation-counts.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/elicitation-counts.test.ts
rename to apps/studio-ui/src/lib/elicitation-counts.test.ts
diff --git a/tools/agent-playground/src/lib/elicitation-counts.ts b/apps/studio-ui/src/lib/elicitation-counts.ts
similarity index 100%
rename from tools/agent-playground/src/lib/elicitation-counts.ts
rename to apps/studio-ui/src/lib/elicitation-counts.ts
diff --git a/tools/agent-playground/src/lib/export/artifact-zip-path.ts b/apps/studio-ui/src/lib/export/artifact-zip-path.ts
similarity index 100%
rename from tools/agent-playground/src/lib/export/artifact-zip-path.ts
rename to apps/studio-ui/src/lib/export/artifact-zip-path.ts
diff --git a/tools/agent-playground/src/lib/fsm-definition-builder.test.ts b/apps/studio-ui/src/lib/fsm-definition-builder.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/fsm-definition-builder.test.ts
rename to apps/studio-ui/src/lib/fsm-definition-builder.test.ts
diff --git a/tools/agent-playground/src/lib/fsm-definition-builder.ts b/apps/studio-ui/src/lib/fsm-definition-builder.ts
similarity index 100%
rename from tools/agent-playground/src/lib/fsm-definition-builder.ts
rename to apps/studio-ui/src/lib/fsm-definition-builder.ts
diff --git a/tools/agent-playground/src/lib/generate-example-payload.test.ts b/apps/studio-ui/src/lib/generate-example-payload.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/generate-example-payload.test.ts
rename to apps/studio-ui/src/lib/generate-example-payload.test.ts
diff --git a/tools/agent-playground/src/lib/generate-example-payload.ts b/apps/studio-ui/src/lib/generate-example-payload.ts
similarity index 100%
rename from tools/agent-playground/src/lib/generate-example-payload.ts
rename to apps/studio-ui/src/lib/generate-example-payload.ts
diff --git a/tools/agent-playground/src/lib/human-input/nested-choice.test.ts b/apps/studio-ui/src/lib/human-input/nested-choice.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/human-input/nested-choice.test.ts
rename to apps/studio-ui/src/lib/human-input/nested-choice.test.ts
diff --git a/tools/agent-playground/src/lib/human-input/nested-choice.ts b/apps/studio-ui/src/lib/human-input/nested-choice.ts
similarity index 100%
rename from tools/agent-playground/src/lib/human-input/nested-choice.ts
rename to apps/studio-ui/src/lib/human-input/nested-choice.ts
diff --git a/tools/agent-playground/src/lib/inspector-state.svelte.ts b/apps/studio-ui/src/lib/inspector-state.svelte.ts
similarity index 100%
rename from tools/agent-playground/src/lib/inspector-state.svelte.ts
rename to apps/studio-ui/src/lib/inspector-state.svelte.ts
diff --git a/tools/agent-playground/src/lib/inspector-state.test.ts b/apps/studio-ui/src/lib/inspector-state.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/inspector-state.test.ts
rename to apps/studio-ui/src/lib/inspector-state.test.ts
diff --git a/tools/agent-playground/src/lib/node-selection.svelte.ts b/apps/studio-ui/src/lib/node-selection.svelte.ts
similarity index 100%
rename from tools/agent-playground/src/lib/node-selection.svelte.ts
rename to apps/studio-ui/src/lib/node-selection.svelte.ts
diff --git a/tools/agent-playground/src/lib/node-state-mapper.test.ts b/apps/studio-ui/src/lib/node-state-mapper.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/node-state-mapper.test.ts
rename to apps/studio-ui/src/lib/node-state-mapper.test.ts
diff --git a/tools/agent-playground/src/lib/node-state-mapper.ts b/apps/studio-ui/src/lib/node-state-mapper.ts
similarity index 100%
rename from tools/agent-playground/src/lib/node-state-mapper.ts
rename to apps/studio-ui/src/lib/node-state-mapper.ts
diff --git a/tools/agent-playground/src/lib/oauth-popup.ts b/apps/studio-ui/src/lib/oauth-popup.ts
similarity index 100%
rename from tools/agent-playground/src/lib/oauth-popup.ts
rename to apps/studio-ui/src/lib/oauth-popup.ts
diff --git a/tools/agent-playground/src/lib/prompt-history.test.ts b/apps/studio-ui/src/lib/prompt-history.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/prompt-history.test.ts
rename to apps/studio-ui/src/lib/prompt-history.test.ts
diff --git a/tools/agent-playground/src/lib/prompt-history.ts b/apps/studio-ui/src/lib/prompt-history.ts
similarity index 100%
rename from tools/agent-playground/src/lib/prompt-history.ts
rename to apps/studio-ui/src/lib/prompt-history.ts
diff --git a/tools/agent-playground/src/lib/queries/agent-queries.ts b/apps/studio-ui/src/lib/queries/agent-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/agent-queries.ts
rename to apps/studio-ui/src/lib/queries/agent-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/artifact-queries.ts b/apps/studio-ui/src/lib/queries/artifact-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/artifact-queries.ts
rename to apps/studio-ui/src/lib/queries/artifact-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/discover-queries.ts b/apps/studio-ui/src/lib/queries/discover-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/discover-queries.ts
rename to apps/studio-ui/src/lib/queries/discover-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/elicitation-queries.ts b/apps/studio-ui/src/lib/queries/elicitation-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/elicitation-queries.ts
rename to apps/studio-ui/src/lib/queries/elicitation-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/index.ts b/apps/studio-ui/src/lib/queries/index.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/index.ts
rename to apps/studio-ui/src/lib/queries/index.ts
diff --git a/tools/agent-playground/src/lib/queries/integration-queries.ts b/apps/studio-ui/src/lib/queries/integration-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/integration-queries.ts
rename to apps/studio-ui/src/lib/queries/integration-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/job-queries.ts b/apps/studio-ui/src/lib/queries/job-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/job-queries.ts
rename to apps/studio-ui/src/lib/queries/job-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/link-credentials.test.ts b/apps/studio-ui/src/lib/queries/link-credentials.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/link-credentials.test.ts
rename to apps/studio-ui/src/lib/queries/link-credentials.test.ts
diff --git a/tools/agent-playground/src/lib/queries/link-credentials.ts b/apps/studio-ui/src/lib/queries/link-credentials.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/link-credentials.ts
rename to apps/studio-ui/src/lib/queries/link-credentials.ts
diff --git a/tools/agent-playground/src/lib/queries/link-provider-queries.test.ts b/apps/studio-ui/src/lib/queries/link-provider-queries.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/link-provider-queries.test.ts
rename to apps/studio-ui/src/lib/queries/link-provider-queries.test.ts
diff --git a/tools/agent-playground/src/lib/queries/link-provider-queries.ts b/apps/studio-ui/src/lib/queries/link-provider-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/link-provider-queries.ts
rename to apps/studio-ui/src/lib/queries/link-provider-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/link-wiring-queries.ts b/apps/studio-ui/src/lib/queries/link-wiring-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/link-wiring-queries.ts
rename to apps/studio-ui/src/lib/queries/link-wiring-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/mcp-queries.test.ts b/apps/studio-ui/src/lib/queries/mcp-queries.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/mcp-queries.test.ts
rename to apps/studio-ui/src/lib/queries/mcp-queries.test.ts
diff --git a/tools/agent-playground/src/lib/queries/mcp-queries.ts b/apps/studio-ui/src/lib/queries/mcp-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/mcp-queries.ts
rename to apps/studio-ui/src/lib/queries/mcp-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/memory-queries.ts b/apps/studio-ui/src/lib/queries/memory-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/memory-queries.ts
rename to apps/studio-ui/src/lib/queries/memory-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/session-queries.ts b/apps/studio-ui/src/lib/queries/session-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/session-queries.ts
rename to apps/studio-ui/src/lib/queries/session-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/skill-queries.ts b/apps/studio-ui/src/lib/queries/skill-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/skill-queries.ts
rename to apps/studio-ui/src/lib/queries/skill-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/skills.ts b/apps/studio-ui/src/lib/queries/skills.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/skills.ts
rename to apps/studio-ui/src/lib/queries/skills.ts
diff --git a/tools/agent-playground/src/lib/queries/workspace-mcp-queries.test.ts b/apps/studio-ui/src/lib/queries/workspace-mcp-queries.test.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/workspace-mcp-queries.test.ts
rename to apps/studio-ui/src/lib/queries/workspace-mcp-queries.test.ts
diff --git a/tools/agent-playground/src/lib/queries/workspace-mcp-queries.ts b/apps/studio-ui/src/lib/queries/workspace-mcp-queries.ts
similarity index 100%
rename from tools/agent-playground/src/lib/queries/workspace-mcp-queries.ts
rename to apps/studio-ui/src/lib/queries/workspace-mcp-queries.ts
diff --git a/tools/agent-playground/src/lib/queries/workspace-queries.ts b/apps/studio-ui/src/lib/queries/workspace-queries.ts
similarity index 100%
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rename from tools/agent-playground/src/routes/platform/[workspaceId]/chat/[[chatId]]/+page.svelte
rename to apps/studio-ui/src/routes/platform/[workspaceId]/chat/[[chatId]]/+page.svelte
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/chat/[[chatId]]/+page.ts b/apps/studio-ui/src/routes/platform/[workspaceId]/chat/[[chatId]]/+page.ts
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/chat/[[chatId]]/+page.ts
rename to apps/studio-ui/src/routes/platform/[workspaceId]/chat/[[chatId]]/+page.ts
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/chat/[[chatId]]/debug/+page.svelte b/apps/studio-ui/src/routes/platform/[workspaceId]/chat/[[chatId]]/debug/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/chat/[[chatId]]/debug/+page.svelte
rename to apps/studio-ui/src/routes/platform/[workspaceId]/chat/[[chatId]]/debug/+page.svelte
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/chat/[[chatId]]/debug/+page.ts b/apps/studio-ui/src/routes/platform/[workspaceId]/chat/[[chatId]]/debug/+page.ts
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/chat/[[chatId]]/debug/+page.ts
rename to apps/studio-ui/src/routes/platform/[workspaceId]/chat/[[chatId]]/debug/+page.ts
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/+server.ts b/apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/+server.ts
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/+server.ts
rename to apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/+server.ts
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/limits.ts b/apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/limits.ts
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/limits.ts
rename to apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/limits.ts
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/+page.server.ts b/apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/+page.server.ts
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/+page.server.ts
rename to apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/+page.server.ts
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/+page.ts b/apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/+page.ts
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/+page.ts
rename to apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/+page.ts
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/+page@.svelte b/apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/+page@.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/+page@.svelte
rename to apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/+page@.svelte
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/preview.test.ts b/apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/preview.test.ts
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/preview.test.ts
rename to apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/preview/preview.test.ts
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/server.test.ts b/apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/server.test.ts
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/chat/[chatId]/export/server.test.ts
rename to apps/studio-ui/src/routes/platform/[workspaceId]/chat/[chatId]/export/server.test.ts
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/edit/+page.svelte b/apps/studio-ui/src/routes/platform/[workspaceId]/edit/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/edit/+page.svelte
rename to apps/studio-ui/src/routes/platform/[workspaceId]/edit/+page.svelte
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/jobs/+page.svelte b/apps/studio-ui/src/routes/platform/[workspaceId]/jobs/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/jobs/+page.svelte
rename to apps/studio-ui/src/routes/platform/[workspaceId]/jobs/+page.svelte
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/jobs/[jobName]/+page.svelte b/apps/studio-ui/src/routes/platform/[workspaceId]/jobs/[jobName]/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/jobs/[jobName]/+page.svelte
rename to apps/studio-ui/src/routes/platform/[workspaceId]/jobs/[jobName]/+page.svelte
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/mcp/+page.svelte b/apps/studio-ui/src/routes/platform/[workspaceId]/mcp/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/mcp/+page.svelte
rename to apps/studio-ui/src/routes/platform/[workspaceId]/mcp/+page.svelte
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/sessions/+page.svelte b/apps/studio-ui/src/routes/platform/[workspaceId]/sessions/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/sessions/+page.svelte
rename to apps/studio-ui/src/routes/platform/[workspaceId]/sessions/+page.svelte
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/sessions/[sessionId]/+page.svelte b/apps/studio-ui/src/routes/platform/[workspaceId]/sessions/[sessionId]/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/sessions/[sessionId]/+page.svelte
rename to apps/studio-ui/src/routes/platform/[workspaceId]/sessions/[sessionId]/+page.svelte
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/signal/[signalId]/+page.svelte b/apps/studio-ui/src/routes/platform/[workspaceId]/signal/[signalId]/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/signal/[signalId]/+page.svelte
rename to apps/studio-ui/src/routes/platform/[workspaceId]/signal/[signalId]/+page.svelte
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/skills/+page.svelte b/apps/studio-ui/src/routes/platform/[workspaceId]/skills/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/skills/+page.svelte
rename to apps/studio-ui/src/routes/platform/[workspaceId]/skills/+page.svelte
diff --git a/tools/agent-playground/src/routes/platform/[workspaceId]/workspace-agent/[agentId]/+page.svelte b/apps/studio-ui/src/routes/platform/[workspaceId]/workspace-agent/[agentId]/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/platform/[workspaceId]/workspace-agent/[agentId]/+page.svelte
rename to apps/studio-ui/src/routes/platform/[workspaceId]/workspace-agent/[agentId]/+page.svelte
diff --git a/tools/agent-playground/src/routes/schedules/+page.svelte b/apps/studio-ui/src/routes/schedules/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/schedules/+page.svelte
rename to apps/studio-ui/src/routes/schedules/+page.svelte
diff --git a/tools/agent-playground/src/routes/settings/+page.svelte b/apps/studio-ui/src/routes/settings/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/settings/+page.svelte
rename to apps/studio-ui/src/routes/settings/+page.svelte
diff --git a/tools/agent-playground/src/routes/skills/+layout.svelte b/apps/studio-ui/src/routes/skills/+layout.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/skills/+layout.svelte
rename to apps/studio-ui/src/routes/skills/+layout.svelte
diff --git a/tools/agent-playground/src/routes/skills/+page.svelte b/apps/studio-ui/src/routes/skills/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/skills/+page.svelte
rename to apps/studio-ui/src/routes/skills/+page.svelte
diff --git a/tools/agent-playground/src/routes/skills/[namespace]/[name]/+page.svelte b/apps/studio-ui/src/routes/skills/[namespace]/[name]/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/skills/[namespace]/[name]/+page.svelte
rename to apps/studio-ui/src/routes/skills/[namespace]/[name]/+page.svelte
diff --git a/tools/agent-playground/src/routes/skills/[namespace]/[name]/[...path]/+page.svelte b/apps/studio-ui/src/routes/skills/[namespace]/[name]/[...path]/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/skills/[namespace]/[name]/[...path]/+page.svelte
rename to apps/studio-ui/src/routes/skills/[namespace]/[name]/[...path]/+page.svelte
diff --git a/tools/agent-playground/src/routes/skills/[namespace]/[name]/edit/+page@.svelte b/apps/studio-ui/src/routes/skills/[namespace]/[name]/edit/+page@.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/skills/[namespace]/[name]/edit/+page@.svelte
rename to apps/studio-ui/src/routes/skills/[namespace]/[name]/edit/+page@.svelte
diff --git a/tools/agent-playground/src/routes/usage/+page.svelte b/apps/studio-ui/src/routes/usage/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/usage/+page.svelte
rename to apps/studio-ui/src/routes/usage/+page.svelte
diff --git a/tools/agent-playground/src/routes/welcome/+page.svelte b/apps/studio-ui/src/routes/welcome/+page.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/welcome/+page.svelte
rename to apps/studio-ui/src/routes/welcome/+page.svelte
diff --git a/tools/agent-playground/src/routes/welcome/combobox.svelte b/apps/studio-ui/src/routes/welcome/combobox.svelte
similarity index 100%
rename from tools/agent-playground/src/routes/welcome/combobox.svelte
rename to apps/studio-ui/src/routes/welcome/combobox.svelte
diff --git a/tools/agent-playground/static-server.ts b/apps/studio-ui/static-server.ts
similarity index 94%
rename from tools/agent-playground/static-server.ts
rename to apps/studio-ui/static-server.ts
index 99028e26a..aa5e4ed25 100644
--- a/tools/agent-playground/static-server.ts
+++ b/apps/studio-ui/static-server.ts
@@ -1,5 +1,5 @@
 /**
- * Production entry point for the bundled `playground` binary.
+ * Production entry point for the bundled `studio-ui` binary.
  *
  * Serves the SvelteKit static build (`build/`) on a fixed port, proxies
  * `/api/daemon/*` to the local atlasd daemon, and forwards `/api/*` to
@@ -15,8 +15,8 @@ import { serveStatic } from "hono/deno";
 import { parse as parseHtml } from "node-html-parser";
 import { api } from "./src/lib/server/router.ts";
 
-const PORT = Number(process.env.PLAYGROUND_PORT ?? "5200");
-const HOST = process.env.PLAYGROUND_HOST ?? "127.0.0.1";
+const PORT = Number(process.env.STUDIO_UI_PORT ?? "5200");
+const HOST = process.env.STUDIO_UI_HOST ?? "127.0.0.1";
 const DAEMON_URL = process.env.FRIDAYD_URL ?? "http://localhost:8080";
 
 // Browser-facing URLs. The launcher owns the port layout, so we can't
@@ -206,8 +206,8 @@ function origin(u: string): string {
     return "<invalid url>";
   }
 }
-console.log(`[playground] listening on http://${HOST}:${PORT}`);
-console.log(`[playground] daemon proxy → ${origin(DAEMON_URL)}`);
-console.log(`[playground] external daemon → ${origin(EXTERNAL_DAEMON_URL)}`);
-if (EXTERNAL_TUNNEL_URL) console.log(`[playground] external tunnel → ${origin(EXTERNAL_TUNNEL_URL)}`);
+console.log(`[studio-ui] listening on http://${HOST}:${PORT}`);
+console.log(`[studio-ui] daemon proxy → ${origin(DAEMON_URL)}`);
+console.log(`[studio-ui] external daemon → ${origin(EXTERNAL_DAEMON_URL)}`);
+if (EXTERNAL_TUNNEL_URL) console.log(`[studio-ui] external tunnel → ${origin(EXTERNAL_TUNNEL_URL)}`);
 Deno.serve({ port: PORT, hostname: HOST }, app.fetch);
diff --git a/tools/agent-playground/static/brand/anthropic.svg b/apps/studio-ui/static/brand/anthropic.svg
similarity index 100%
rename from tools/agent-playground/static/brand/anthropic.svg
rename to apps/studio-ui/static/brand/anthropic.svg
diff --git a/tools/agent-playground/static/brand/google.svg b/apps/studio-ui/static/brand/google.svg
similarity index 100%
rename from tools/agent-playground/static/brand/google.svg
rename to apps/studio-ui/static/brand/google.svg
diff --git a/tools/agent-playground/static/brand/groq.svg b/apps/studio-ui/static/brand/groq.svg
similarity index 100%
rename from tools/agent-playground/static/brand/groq.svg
rename to apps/studio-ui/static/brand/groq.svg
diff --git a/tools/agent-playground/static/brand/openai.svg b/apps/studio-ui/static/brand/openai.svg
similarity index 100%
rename from tools/agent-playground/static/brand/openai.svg
rename to apps/studio-ui/static/brand/openai.svg
diff --git a/tools/agent-playground/svelte.config.js b/apps/studio-ui/svelte.config.js
similarity index 85%
rename from tools/agent-playground/svelte.config.js
rename to apps/studio-ui/svelte.config.js
index a52762fb1..7451893f0 100644
--- a/tools/agent-playground/svelte.config.js
+++ b/apps/studio-ui/svelte.config.js
@@ -11,9 +11,9 @@ const config = {
     adapter: adapter({ fallback: "index.html" }),
     // Inline ALL CSS into every SSR response: the chat-export route ships a
     // zip of static HTML that must render standalone in any browser with no
-    // <link rel="stylesheet"> fetches. Tradeoff: every playground page now
+    // <link rel="stylesheet"> fetches. Tradeoff: every studio-ui page now
     // duplicates its full CSS inline — no cross-navigation stylesheet cache.
-    // Fine because agent-playground is a local-only dev tool; if it ever
+    // Fine because studio-ui is a local-only dev tool; if it ever
     // serves over a network, move this into a per-route rewriter in +server.ts.
     inlineStyleThreshold: Infinity,
   },
diff --git a/tools/agent-playground/tsconfig.json b/apps/studio-ui/tsconfig.json
similarity index 100%
rename from tools/agent-playground/tsconfig.json
rename to apps/studio-ui/tsconfig.json
diff --git a/tools/agent-playground/vite.config.ts b/apps/studio-ui/vite.config.ts
similarity index 100%
rename from tools/agent-playground/vite.config.ts
rename to apps/studio-ui/vite.config.ts
diff --git a/biome.json b/biome.json
index 8fb5c2e31..a023c80b0 100644
--- a/biome.json
+++ b/biome.json
@@ -16,7 +16,7 @@
       "!**/vendor",
       "!packages/vendor",
       "!packages/ui",
-      "!tools/agent-playground",
+      "!apps/studio-ui",
       "!tools/chat-replay",
       "!opensrc",
       "!.claude"
diff --git a/deno.compile.json b/deno.compile.json
index c5aae88a6..952ec2fbc 100644
--- a/deno.compile.json
+++ b/deno.compile.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://raw.githubusercontent.com/denoland/deno/main/cli/schemas/config-file.v1.json",
   "version": "1.0.0",
-  "workspace": ["./apps/*", "./packages/*", "./tools/evals", "./tools/agent-playground"],
+  "workspace": ["./apps/*", "./packages/*", "./tools/evals"],
   "compilerOptions": {
     "lib": ["deno.window", "deno.worker", "deno.unstable", "dom", "dom.iterable"],
     "types": ["./reset.d.ts"],
@@ -15,14 +15,14 @@
   },
   "exclude": [
     "!integration-tests/**/*.test.ts",
-    "tools/agent-playground/.svelte-kit",
-    "tools/agent-playground/src/routes/**",
-    "tools/agent-playground/src/**/*.svelte.ts",
-    "tools/agent-playground/src/lib/inspector-state.test.ts",
-    "tools/agent-playground/src/lib/editor/**",
-    "tools/agent-playground/src/lib/queries/**",
-    "tools/agent-playground/src/lib/stores/**",
-    "tools/agent-playground/src/lib/utils/markdown.ts",
+    "apps/studio-ui/.svelte-kit",
+    "apps/studio-ui/src/routes/**",
+    "apps/studio-ui/src/**/*.svelte.ts",
+    "apps/studio-ui/src/lib/inspector-state.test.ts",
+    "apps/studio-ui/src/lib/editor/**",
+    "apps/studio-ui/src/lib/queries/**",
+    "apps/studio-ui/src/lib/stores/**",
+    "apps/studio-ui/src/lib/utils/markdown.ts",
     "opensrc",
     "types"
   ],
@@ -35,8 +35,8 @@
     "atlas:dev": "deno run -q --allow-all --unstable-worker-options --unstable-kv --unstable-raw-imports --env-file scripts/dev-watcher.ts",
     "start": "deno run --allow-all --unstable-worker-options --unstable-kv --unstable-raw-imports apps/atlas-cli/src/otel-bootstrap.ts",
     "dev": "deno task sync:svelte && FAST_DEVELOPMENT=true LINK_DEV_MODE=true deno run -A npm:concurrently -n daemon,link -c blue,green 'deno task atlas:dev daemon start' 'cd apps/link && deno task dev'",
-    "dev:playground": "FAST_DEVELOPMENT=true LINK_DEV_MODE=true deno run -A npm:concurrently -n daemon,link,playground,tunnel -c blue,green,magenta,cyan 'deno task atlas:dev daemon start' 'cd apps/link && deno task dev' 'deno task playground' 'deno task webhook-tunnel'",
-    "dev:playground:stable": "FAST_DEVELOPMENT=true LINK_DEV_MODE=true deno run -A npm:concurrently -n daemon,link,playground,tunnel -c blue,green,magenta,cyan 'deno task atlas daemon start' 'cd apps/link && deno task dev' 'deno task playground' 'deno task webhook-tunnel'",
+    "dev:studio-ui": "FAST_DEVELOPMENT=true LINK_DEV_MODE=true deno run -A npm:concurrently -n daemon,link,studio-ui,tunnel -c blue,green,magenta,cyan 'deno task atlas:dev daemon start' 'cd apps/link && deno task dev' 'deno task studio-ui' 'deno task webhook-tunnel'",
+    "dev:studio-ui:stable": "FAST_DEVELOPMENT=true LINK_DEV_MODE=true deno run -A npm:concurrently -n daemon,link,studio-ui,tunnel -c blue,green,magenta,cyan 'deno task atlas daemon start' 'cd apps/link && deno task dev' 'deno task studio-ui' 'deno task webhook-tunnel'",
     "webhook-tunnel": "deno run --allow-all apps/webhook-tunnel/src/index.ts",
     "test": "OTEL_DENO=true DENO_TESTING=true LINK_DEV_MODE=true vitest run",
     "fmt": "deno run -A npm:@biomejs/biome format --write",
@@ -50,8 +50,8 @@
     "clean:agents": "deno run -A scripts/clean.ts --agents",
     "compile": "./scripts/compile.sh",
     "evals": "deno run --allow-all tools/evals/run.ts",
-    "sync:svelte": "deno task -f @atlas/ui sync && deno task -f @atlas/agent-playground sync",
-    "playground": "deno task sync:svelte && cd tools/agent-playground && EXTERNAL_DAEMON_URL=http://localhost:8080 EXTERNAL_TUNNEL_URL=http://localhost:9090 npx vite dev"
+    "sync:svelte": "deno task -f @atlas/ui sync && deno task -f @atlas/studio-ui sync",
+    "studio-ui": "deno task sync:svelte && cd apps/studio-ui && EXTERNAL_DAEMON_URL=http://localhost:8080 EXTERNAL_TUNNEL_URL=http://localhost:9090 npx vite dev"
   },
   "lint": { "rules": { "tags": ["recommended"] }, "exclude": ["opensrc/**"] },
   "imports": {
diff --git a/deno.json b/deno.json
index 0f7da8d1d..af8599ba2 100644
--- a/deno.json
+++ b/deno.json
@@ -1,7 +1,7 @@
 {
   "$schema": "https://raw.githubusercontent.com/denoland/deno/main/cli/schemas/config-file.v1.json",
   "version": "1.0.0",
-  "workspace": ["./apps/*", "./packages/*", "./tools/evals", "./tools/agent-playground"],
+  "workspace": ["./apps/*", "./packages/*", "./tools/evals"],
   "compilerOptions": {
     "lib": ["deno.window", "deno.worker", "deno.unstable", "dom", "dom.iterable"],
     "types": ["./reset.d.ts"],
@@ -17,14 +17,14 @@
     "!integration-tests/**/*.test.ts",
     ".claude/worktrees",
     ".claude/projects",
-    "tools/agent-playground/.svelte-kit",
-    "tools/agent-playground/src/routes/**",
-    "tools/agent-playground/src/**/*.svelte.ts",
-    "tools/agent-playground/src/lib/inspector-state.test.ts",
-    "tools/agent-playground/src/lib/editor/**",
-    "tools/agent-playground/src/lib/queries/**",
-    "tools/agent-playground/src/lib/stores/**",
-    "tools/agent-playground/src/lib/utils/markdown.ts",
+    "apps/studio-ui/.svelte-kit",
+    "apps/studio-ui/src/routes/**",
+    "apps/studio-ui/src/**/*.svelte.ts",
+    "apps/studio-ui/src/lib/inspector-state.test.ts",
+    "apps/studio-ui/src/lib/editor/**",
+    "apps/studio-ui/src/lib/queries/**",
+    "apps/studio-ui/src/lib/stores/**",
+    "apps/studio-ui/src/lib/utils/markdown.ts",
     "tools/chat-replay",
     "opensrc",
     "types"
@@ -37,8 +37,8 @@
     "atlas": "deno run -q --allow-all --unstable-worker-options --unstable-kv --unstable-raw-imports --env-file apps/atlas-cli/src/otel-bootstrap.ts",
     "atlas:dev": "deno run -q --allow-all --unstable-worker-options --unstable-kv --unstable-raw-imports --env-file scripts/dev-watcher.ts",
     "start": "deno run --allow-all --unstable-worker-options --unstable-kv --unstable-raw-imports apps/atlas-cli/src/otel-bootstrap.ts",
-    "dev:playground": "FAST_DEVELOPMENT=true LINK_DEV_MODE=true deno run -A npm:concurrently@^9.2.1 -n daemon,link,playground,tunnel -c blue,green,magenta,cyan 'deno task atlas:dev daemon start' 'cd apps/link && deno task dev' 'deno task playground' 'deno task webhook-tunnel'",
-    "dev:playground:stable": "FAST_DEVELOPMENT=true LINK_DEV_MODE=true deno run -A npm:concurrently@^9.2.1 -n daemon,link,playground,tunnel -c blue,green,magenta,cyan 'deno task atlas daemon start' 'cd apps/link && deno task dev' 'deno task playground' 'deno task webhook-tunnel'",
+    "dev:studio-ui": "FAST_DEVELOPMENT=true LINK_DEV_MODE=true deno run -A npm:concurrently@^9.2.1 -n daemon,link,studio-ui,tunnel -c blue,green,magenta,cyan 'deno task atlas:dev daemon start' 'cd apps/link && deno task dev' 'deno task studio-ui' 'deno task webhook-tunnel'",
+    "dev:studio-ui:stable": "FAST_DEVELOPMENT=true LINK_DEV_MODE=true deno run -A npm:concurrently@^9.2.1 -n daemon,link,studio-ui,tunnel -c blue,green,magenta,cyan 'deno task atlas daemon start' 'cd apps/link && deno task dev' 'deno task studio-ui' 'deno task webhook-tunnel'",
     "webhook-tunnel": "go run ./tools/webhook-tunnel",
     "test": "OTEL_DENO=true DENO_TESTING=true LINK_DEV_MODE=true DEV_MODE=true vitest run",
     "fmt": "deno run -A npm:@biomejs/biome format --write",
@@ -52,8 +52,8 @@
     "clean:agents": "deno run -A scripts/clean.ts --agents",
     "compile": "./scripts/compile.sh",
     "evals": "deno run --allow-all tools/evals/run.ts",
-    "sync:svelte": "deno task -f @atlas/ui sync && deno task -f @atlas/agent-playground sync",
-    "playground": "deno task sync:svelte && cd tools/agent-playground && EXTERNAL_DAEMON_URL=http://localhost:8080 EXTERNAL_TUNNEL_URL=http://localhost:9090 npx vite dev"
+    "sync:svelte": "deno task -f @atlas/ui sync && deno task -f @atlas/studio-ui sync",
+    "studio-ui": "deno task sync:svelte && cd apps/studio-ui && EXTERNAL_DAEMON_URL=http://localhost:8080 EXTERNAL_TUNNEL_URL=http://localhost:9090 npx vite dev"
   },
   "lint": { "rules": { "tags": ["recommended"] }, "exclude": ["opensrc/**"] },
   "imports": {
diff --git a/deno.lock b/deno.lock
index aea61d190..71d23f534 100644
--- a/deno.lock
+++ b/deno.lock
@@ -6,14 +6,17 @@
     "jsr:@std/assert@1": "1.0.19",
     "jsr:@std/assert@^1.0.16": "1.0.19",
     "jsr:@std/assert@^1.0.19": "1.0.19",
+    "jsr:@std/async@1.0.15": "1.0.15",
     "jsr:@std/async@^1.0.15": "1.3.0",
     "jsr:@std/async@^1.3.0": "1.3.0",
+    "jsr:@std/cli@^1.0.6": "1.0.29",
     "jsr:@std/data-structures@^1.0.11": "1.0.11",
     "jsr:@std/dotenv@~0.225.5": "0.225.6",
     "jsr:@std/encoding@1": "1.0.10",
     "jsr:@std/encoding@1.0.10": "1.0.10",
     "jsr:@std/fmt@1": "1.0.10",
     "jsr:@std/fs@1": "1.0.23",
+    "jsr:@std/fs@1.0.13": "1.0.13",
     "jsr:@std/fs@^1.0.23": "1.0.23",
     "jsr:@std/internal@^1.0.12": "1.0.13",
     "jsr:@std/internal@^1.0.13": "1.0.13",
@@ -147,6 +150,7 @@
     "npm:minimatch@^10.2.5": "10.2.5",
     "npm:nanoid@5.1.11": "5.1.11",
     "npm:nanoid@^5.1.6": "5.1.11",
+    "npm:nats@2": "2.29.3",
     "npm:nats@^2.29.3": "2.29.3",
     "npm:node-html-parser@^7.1.0": "7.1.0",
     "npm:oauth4webapi@3.8.6": "3.8.6",
@@ -174,13 +178,16 @@
     "npm:ulid@^3.0.2": "3.0.2",
     "npm:undici@^7.25.0": "7.25.0",
     "npm:vite@^7.3.2": "7.3.3_@types+node@25.6.2_yaml@2.8.4",
+    "npm:vitest@*": "4.1.5_@opentelemetry+api@1.9.1_@types+node@25.6.2_@vitest+coverage-v8@4.1.5_happy-dom@20.9.0_vite@7.3.3__@types+node@25.6.2__yaml@2.8.4_yaml@2.8.4",
     "npm:vitest@^4.1.0": "4.1.5_@opentelemetry+api@1.9.1_@types+node@25.6.2_@vitest+coverage-v8@4.1.5_happy-dom@20.9.0_vite@7.3.3__@types+node@25.6.2__yaml@2.8.4_yaml@2.8.4",
     "npm:vitest@^4.1.5": "4.1.5_@opentelemetry+api@1.9.1_@types+node@25.6.2_@vitest+coverage-v8@4.1.5_happy-dom@20.9.0_vite@7.3.3__@types+node@25.6.2__yaml@2.8.4_yaml@2.8.4",
     "npm:xstate@^5.31.0": "5.31.0",
     "npm:yaml@^2.8.4": "2.8.4",
     "npm:yargs@18": "18.0.0",
+    "npm:zod@4": "4.4.3",
     "npm:zod@4.4.3": "4.4.3",
     "npm:zod@^4.2.1": "4.4.3",
+    "npm:zod@^4.3.5": "4.4.3",
     "npm:zod@^4.4.3": "4.4.3"
   },
   "jsr": {
@@ -206,12 +213,18 @@
         "jsr:@std/internal@^1.0.12"
       ]
     },
+    "@std/async@1.0.15": {
+      "integrity": "55d1d9d04f99403fe5730ab16bdcc3c47f658a6bf054cafb38a50f046238116e"
+    },
     "@std/async@1.3.0": {
       "integrity": "80485538a4f7baaa46bfe2246168069e02ed142b9f9079cd164f43bb060ad9e9",
       "dependencies": [
         "jsr:@std/data-structures"
       ]
     },
+    "@std/cli@1.0.29": {
+      "integrity": "fa4ef29130baa834d8a13b7d138240c3a2fcfba740bfb7afa646a360a15ec84f"
+    },
     "@std/data-structures@1.0.11": {
       "integrity": "53b98ed7efa61f107dfc14244bd2ec5557f7f7ee0bbaef6d449d7937facacb89"
     },
@@ -224,6 +237,9 @@
     "@std/fmt@1.0.10": {
       "integrity": "90dfba288802ac6de82fb31d0917eb9e4450b9925b954d5e51fc29ac07419db5"
     },
+    "@std/fs@1.0.13": {
+      "integrity": "756d3ff0ade91c9e72b228e8012b6ff00c3d4a4ac9c642c4dac083536bf6c605"
+    },
     "@std/fs@1.0.23": {
       "integrity": "3ecbae4ce4fee03b180fa710caff36bb5adb66631c46a6460aaad49515565a37",
       "dependencies": [
@@ -6329,6 +6345,52 @@
           ]
         }
       },
+      "apps/studio-ui": {
+        "dependencies": [
+          "npm:hono@4.12.18"
+        ],
+        "packageJson": {
+          "dependencies": [
+            "npm:@ai-sdk/svelte@^4.0.177",
+            "npm:@codemirror/lang-markdown@^6.5.0",
+            "npm:@codemirror/lang-yaml@^6.1.3",
+            "npm:@codemirror/language@^6.12.3",
+            "npm:@codemirror/state@^6.6.0",
+            "npm:@codemirror/view@^6.42.1",
+            "npm:@hono/zod-validator@~0.7.6",
+            "npm:@lezer/highlight@^1.2.3",
+            "npm:@melt-ui/pp@~0.3.2",
+            "npm:@melt-ui/svelte@~0.86.6",
+            "npm:@opentelemetry/api@^1.9.1",
+            "npm:@sveltejs/adapter-static@^3.0.10",
+            "npm:@sveltejs/kit@^2.59.0",
+            "npm:@sveltejs/vite-plugin-svelte@~6.2.4",
+            "npm:@tanstack/query-core@^5.100.8",
+            "npm:@tanstack/svelte-query@^6.1.28",
+            "npm:@tanstack/svelte-table@9.0.0-alpha.41",
+            "npm:@tanstack/svelte-virtual@~3.13.24",
+            "npm:@types/deno@2.5.0",
+            "npm:ai@^6.0.177",
+            "npm:codemirror@^6.0.2",
+            "npm:diff@9",
+            "npm:dompurify@^3.4.2",
+            "npm:eslint@^10.3.0",
+            "npm:happy-dom@^20.9.0",
+            "npm:hono@4.12.18",
+            "npm:jszip@^3.10.1",
+            "npm:node-html-parser@^7.1.0",
+            "npm:prettier@^3.8.3",
+            "npm:shiki@^4.0.2",
+            "npm:svelte-check@^4.4.7",
+            "npm:svelte@^5.55.5",
+            "npm:typescript@^5.9.3",
+            "npm:vite@^7.3.2",
+            "npm:vitest@^4.1.0",
+            "npm:yaml@^2.8.4",
+            "npm:zod@^4.4.3"
+          ]
+        }
+      },
       "packages/adapters-md": {
         "packageJson": {
           "dependencies": [
@@ -6683,52 +6745,6 @@
           ]
         }
       },
-      "tools/agent-playground": {
-        "dependencies": [
-          "npm:hono@4.12.18"
-        ],
-        "packageJson": {
-          "dependencies": [
-            "npm:@ai-sdk/svelte@^4.0.177",
-            "npm:@codemirror/lang-markdown@^6.5.0",
-            "npm:@codemirror/lang-yaml@^6.1.3",
-            "npm:@codemirror/language@^6.12.3",
-            "npm:@codemirror/state@^6.6.0",
-            "npm:@codemirror/view@^6.42.1",
-            "npm:@hono/zod-validator@~0.7.6",
-            "npm:@lezer/highlight@^1.2.3",
-            "npm:@melt-ui/pp@~0.3.2",
-            "npm:@melt-ui/svelte@~0.86.6",
-            "npm:@opentelemetry/api@^1.9.1",
-            "npm:@sveltejs/adapter-static@^3.0.10",
-            "npm:@sveltejs/kit@^2.59.0",
-            "npm:@sveltejs/vite-plugin-svelte@~6.2.4",
-            "npm:@tanstack/query-core@^5.100.8",
-            "npm:@tanstack/svelte-query@^6.1.28",
-            "npm:@tanstack/svelte-table@9.0.0-alpha.41",
-            "npm:@tanstack/svelte-virtual@~3.13.24",
-            "npm:@types/deno@2.5.0",
-            "npm:ai@^6.0.177",
-            "npm:codemirror@^6.0.2",
-            "npm:diff@9",
-            "npm:dompurify@^3.4.2",
-            "npm:eslint@^10.3.0",
-            "npm:happy-dom@^20.9.0",
-            "npm:hono@4.12.18",
-            "npm:jszip@^3.10.1",
-            "npm:node-html-parser@^7.1.0",
-            "npm:prettier@^3.8.3",
-            "npm:shiki@^4.0.2",
-            "npm:svelte-check@^4.4.7",
-            "npm:svelte@^5.55.5",
-            "npm:typescript@^5.9.3",
-            "npm:vite@^7.3.2",
-            "npm:vitest@^4.1.0",
-            "npm:yaml@^2.8.4",
-            "npm:zod@^4.4.3"
-          ]
-        }
-      },
       "tools/evals": {
         "packageJson": {
           "dependencies": [
diff --git a/docker/run-platform.sh b/docker/run-platform.sh
index 155f8ef5d..944a334b1 100644
--- a/docker/run-platform.sh
+++ b/docker/run-platform.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Platform entrypoint: starts atlasd, link, and agent-playground.
+# Platform entrypoint: starts atlasd, link, and studio-ui.
 # Follows the grafana/docker-otel-lgtm shell-based supervisor pattern.
 #
 set -euo pipefail
@@ -66,27 +66,27 @@ echo "[platform] Starting link on :3100..."
 link &
 LINK_PID=$!
 
-# Wait for backends before starting the playground — the playground proxies
-# to atlasd on load, so starting it early produces 500s in the browser.
+# Wait for backends before starting studio-ui — it proxies to atlasd on load,
+# so starting it early produces 500s in the browser.
 echo "[platform] Waiting for backend services..."
 wait_for_service "atlasd" "http://localhost:8080/health"
 wait_for_service "link"   "http://localhost:3100/health"
 
-# ── Start playground after backends are healthy ──────────────────────────────
+# ── Start studio-ui after backends are healthy ───────────────────────────────
 
-echo "[platform] Starting agent-playground on :5200..."
+echo "[platform] Starting studio-ui on :5200..."
 export VITE_EXTERNAL_DAEMON_URL="http://localhost:${FRIDAY_DAEMON_PORT:-18080}"
 export VITE_EXTERNAL_TUNNEL_URL="http://localhost:${FRIDAY_TUNNEL_PORT:-19090}"
-cd /app/tools/agent-playground
+cd /app/apps/studio-ui
 deno run -A --no-lock npm:vite dev --host 0.0.0.0 --port 5200 --logLevel warn &
-PLAYGROUND_PID=$!
+STUDIO_UI_PID=$!
 cd /app
 
 echo "[platform] Starting webhook-tunnel on :9090..."
 FRIDAYD_URL=http://localhost:8080 webhook-tunnel &
 TUNNEL_PID=$!
 
-wait_for_service "agent-playground" "http://localhost:5200"
+wait_for_service "studio-ui" "http://localhost:5200"
 wait_for_service "webhook-tunnel" "http://localhost:9090/health"
 
 echo ""
@@ -102,7 +102,7 @@ echo ""
 
 # ── Keep alive ───────────────────────────────────────────────────────────────
 # Wait for any service to exit — if one dies, stop everything
-wait -n $ATLASD_PID $LINK_PID $PLAYGROUND_PID $TUNNEL_PID 2>/dev/null || true
+wait -n $ATLASD_PID $LINK_PID $STUDIO_UI_PID $TUNNEL_PID 2>/dev/null || true
 
 echo "[platform] A service exited unexpectedly. Shutting down..."
 shutdown
diff --git a/knip.json b/knip.json
index c21121f39..e02425aef 100644
--- a/knip.json
+++ b/knip.json
@@ -86,7 +86,7 @@
         "$app/*": ["../../node_modules/@sveltejs/kit/src/runtime/app/*"]
       }
     },
-    "tools/agent-playground": {
+    "apps/studio-ui": {
       "entry": ["mod.ts!", "static-server.ts!", "src/routes/**/*.svelte!", "src/**/*.test.ts"],
       "project": ["src/**/*.{ts,tsx,js,jsx,svelte}!", "*.ts!", "*.js!"],
       "paths": {
diff --git a/lint-staged.config.js b/lint-staged.config.js
index de413e1b7..e47639613 100644
--- a/lint-staged.config.js
+++ b/lint-staged.config.js
@@ -65,7 +65,7 @@ export default {
     // passing only excluded files causes `deno lint` to fail with "No target files found".
     const DENO_LINT_EXCLUDED = [
       "/packages/ui/src/",
-      "/tools/agent-playground/src/",
+      "/apps/studio-ui/src/",
       "/tools/chat-replay/",
       "/deprecated/",
     ];
diff --git a/package.json b/package.json
index be20f0f1a..a20a2cd31 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
   "bugs": { "url": "https://github.com/friday-platform/friday-studio/issues" },
   "author": "Tempest Labs, Inc.",
   "license": "BUSL-1.1",
-  "workspaces": ["./apps/*", "./packages/*", "./tools/evals", "./tools/agent-playground"],
+  "workspaces": ["./apps/*", "./packages/*", "./tools/evals"],
   "dependencies": {
     "@atlas/agent-sdk": "workspace:*",
     "@atlas/atlasd": "workspace:*",
diff --git a/packages/core/src/architecture.test.ts b/packages/core/src/architecture.test.ts
index 9e65eb075..28aa4be77 100644
--- a/packages/core/src/architecture.test.ts
+++ b/packages/core/src/architecture.test.ts
@@ -18,7 +18,7 @@ function* walk(dir: string): Generator<string> {
 
 describe("architecture", () => {
   // `@atlas/core` exports session-event types and reducers consumed by the
-  // browser bundle (agent-playground). The bare `@atlas/hallucination` entry
+  // browser bundle (studio-ui). The bare `@atlas/hallucination` entry
   // re-exports `validate` and `createFSMOutputValidator` — which transitively
   // import `@atlas/logger` → `node:process`. Always use the
   // @atlas/hallucination/verdict` subpath here.
diff --git a/packages/core/src/chat/export/render.ts b/packages/core/src/chat/export/render.ts
index a635d70aa..e2d1cd1a9 100644
--- a/packages/core/src/chat/export/render.ts
+++ b/packages/core/src/chat/export/render.ts
@@ -1,6 +1,6 @@
 /**
  * Pure render helpers shared between the live chat UI and the chat export
- * route. Lifted out of `tools/agent-playground/.../user-chat.svelte` and
+ * route. Lifted out of `apps/studio-ui/.../user-chat.svelte` and
  * `chat-message-list.svelte` so the export route in `apps/atlasd` can call
  * them server-side and produce HTML that mirrors what the user saw.
  *
diff --git a/packages/core/src/chat/export/types.ts b/packages/core/src/chat/export/types.ts
index 7edb792b1..f1855eb01 100644
--- a/packages/core/src/chat/export/types.ts
+++ b/packages/core/src/chat/export/types.ts
@@ -1,6 +1,6 @@
 /**
  * Shared render-shape types used by the live chat UI and the chat export
- * route. Lifted from `tools/agent-playground/.../types.ts` so server-side
+ * route. Lifted from `apps/studio-ui/.../types.ts` so server-side
  * HTML generation in `apps/atlasd` can reuse the same render helpers
  * without dragging Svelte into the daemon.
  *
diff --git a/packages/system/skills/friday-cli/references/cli.md b/packages/system/skills/friday-cli/references/cli.md
index e689b6ffc..4733319f4 100644
--- a/packages/system/skills/friday-cli/references/cli.md
+++ b/packages/system/skills/friday-cli/references/cli.md
@@ -198,7 +198,7 @@ via NATS request/reply. See the `writing-friday-python-agents` skill for the ful
 ### `agent exec`
 `agent exec <agent> -i <input> [--url http://localhost:5200] [--env K=V,K2=V2] [--json] [--stream]`
 
-Executes an agent via the playground. Requires `deno task playground` running
+Executes an agent via Studio UI. Requires `deno task studio-ui` running
 separately on :5200. Good for testing agents in isolation before wiring them
 into a workspace.
 
diff --git a/packages/system/skills/writing-friday-python-agents/SKILL.md b/packages/system/skills/writing-friday-python-agents/SKILL.md
index 483acd45d..c3f3fe920 100644
--- a/packages/system/skills/writing-friday-python-agents/SKILL.md
+++ b/packages/system/skills/writing-friday-python-agents/SKILL.md
@@ -395,7 +395,7 @@ curl -s -X POST "http://localhost:8080/api/agents/my-agent/run?workspaceId=user"
   -d '{"input": "test prompt"}'
 ```
 
-Or via the playground API on `localhost:5200`:
+Or via Studio UI on `localhost:5200`:
 
 ```bash
 curl -s -X POST http://localhost:5200/api/agents/my-agent/run \
diff --git a/packages/system/skills/writing-workspace-signals/SKILL.md b/packages/system/skills/writing-workspace-signals/SKILL.md
index a36a15778..cdc116049 100644
--- a/packages/system/skills/writing-workspace-signals/SKILL.md
+++ b/packages/system/skills/writing-workspace-signals/SKILL.md
@@ -136,7 +136,7 @@ signals:
 
 `missedWindow` (Duration: `s`/`m`/`h`, default `24h`) caps the catch-up window for every policy. A daemon down for a week with `catchup` on an hourly cron only fires the slots inside the window — never all 168.
 
-Missed-schedule events surface on the playground `/schedules` page under "Missed schedules" and persist in the JetStream `WORKSPACE_EVENTS` stream for 30 days. `manual` events that haven't been fired/dismissed show a pending badge + action buttons.
+Missed-schedule events surface on the Studio UI `/schedules` page under "Missed schedules" and persist in the JetStream `WORKSPACE_EVENTS` stream for 30 days. `manual` events that haven't been fired/dismissed show a pending badge + action buttons.
 
 ### Concurrency policy
 
diff --git a/scripts/build-studio.ts b/scripts/build-studio.ts
index 5af9b7e06..2c8db4a01 100644
--- a/scripts/build-studio.ts
+++ b/scripts/build-studio.ts
@@ -18,7 +18,7 @@
  *   x86_64-pc-windows-msvc     (Windows x64,        zip)
  *
  * For each target the script:
- *   1. `deno compile`s atlas, link, webhook-tunnel, playground.
+ *   1. `deno compile`s atlas, link, webhook-tunnel, studio-ui.
  *   2. Downloads pinned external CLIs (gh, cloudflared) for the target.
  *   3. Stages everything under dist/<target>/staging/.
  *   4. Archives the staging dir + emits sha256 + size.
@@ -309,10 +309,10 @@ const DENO_BINARIES = [
     include: [] as string[],
   },
   {
-    name: "playground",
-    entry: "tools/agent-playground/static-server.ts",
+    name: "studio-ui",
+    entry: "apps/studio-ui/static-server.ts",
     flags: ["--unstable-worker-options", "--unstable-kv", "--unstable-raw-imports"],
-    include: ["tools/agent-playground/build"],
+    include: ["apps/studio-ui/build"],
   },
 ];
 
@@ -660,11 +660,11 @@ async function main(): Promise<void> {
   await ensureDir(stagingDir);
   await ensureDir(scratchDir);
 
-  // Make sure the playground build artifact exists before deno-compile embeds it.
-  const playgroundBuild = join(repoRoot, "tools/agent-playground/build");
-  if (!existsSync(playgroundBuild)) {
-    console.log("[build-studio] playground build missing — running vite build…");
-    await run(["npm", "run", "build"], { cwd: join(repoRoot, "tools/agent-playground") });
+  // Make sure the studio-ui build artifact exists before deno-compile embeds it.
+  const studioUiBuild = join(repoRoot, "apps/studio-ui/build");
+  if (!existsSync(studioUiBuild)) {
+    console.log("[build-studio] studio-ui build missing — running vite build…");
+    await run(["npm", "run", "build"], { cwd: join(repoRoot, "apps/studio-ui") });
   }
 
   // Stack 3 split-destination layout:
@@ -675,7 +675,7 @@ async function main(): Promise<void> {
   //   <staging>/bin/friday                   ← every supervised binary
   //   <staging>/bin/link                       lives under bin/ so it
   //   <staging>/bin/webhook-tunnel             can't collide with a
-  //   <staging>/bin/playground                 user-data dir name (e.g.
+  //   <staging>/bin/studio-ui                  user-data dir name (e.g.
   //   <staging>/bin/nats-server                link-data/wiring.db) and
   //   <staging>/bin/agent-browser              the launcher's friday-home
   //   <staging>/bin/cloudflared                stays clean of binaries.
@@ -709,8 +709,8 @@ async function main(): Promise<void> {
     console.log("[build-studio] --skip-compile set, skipping deno + go compile");
   }
 
-  // Sidecar read at playground startup via dirname(Deno.execPath()) to
-  // distinguish release builds from `deno task playground` (no sidecar → dev).
+  // Sidecar read at studio-ui startup via dirname(Deno.execPath()) to
+  // distinguish release builds from `deno task studio-ui` (no sidecar → dev).
   await Deno.writeTextFile(join(binStaging, ".studio-version"), `${opts.version}\n`);
 
   if (!opts.skipExternal) {
diff --git a/scripts/dev-watcher.ts b/scripts/dev-watcher.ts
index 738f38e86..e7db2fde0 100644
--- a/scripts/dev-watcher.ts
+++ b/scripts/dev-watcher.ts
@@ -63,7 +63,7 @@ const EXCLUDE_SUBSTRINGS: readonly string[] = [
   "/dist/",
   "/build/",
   "/.atlas/",
-  "/tools/agent-playground/",
+  "/apps/studio-ui/",
   "/.deno/",
   "/coverage/",
   "/__fixtures__/",
diff --git a/scripts/generate-third-party-licenses.sh b/scripts/generate-third-party-licenses.sh
index 5ec13cce8..be6c4cab9 100755
--- a/scripts/generate-third-party-licenses.sh
+++ b/scripts/generate-third-party-licenses.sh
@@ -69,7 +69,7 @@ emit_header() {
 # Third-Party Licenses
 
 This file lists every third-party dependency bundled into a shipped Friday
-Studio artifact (the daemon, CLI, web playground, Friday Launcher,
+Studio artifact (the daemon, CLI, Studio UI, Friday Launcher,
 webhook tunnel, and Studio Installer). It is generated automatically by
 [`scripts/generate-third-party-licenses.sh`](scripts/generate-third-party-licenses.sh).
 
@@ -126,7 +126,7 @@ emit_rust() {
 emit_node() {
   echo "## npm / JSR packages" >> "$OUT"
   echo >> "$OUT"
-  echo "Bundled into: the Atlas daemon, CLI, web playground, and any compiled" >> "$OUT"
+  echo "Bundled into: the Atlas daemon, CLI, Studio UI, and any compiled" >> "$OUT"
   echo "Deno binaries. Inventory is taken from \`deno.lock\`." >> "$OUT"
   echo >> "$OUT"
   echo "| Package | Version | Source |" >> "$OUT"
diff --git a/tools/agent-playground/mod.ts b/tools/agent-playground/mod.ts
deleted file mode 100644
index c66e4f1d7..000000000
--- a/tools/agent-playground/mod.ts
+++ /dev/null
@@ -1,2 +0,0 @@
-// @atlas/agent-playground — dev tool, no public exports
-export {};
diff --git a/tools/agent-playground/src/lib/components/chat/__snapshots__/validation-pill-row.test.ts.snap b/tools/agent-playground/src/lib/components/chat/__snapshots__/validation-pill-row.test.ts.snap
deleted file mode 100644
index edd9df4a8..000000000
--- a/tools/agent-playground/src/lib/components/chat/__snapshots__/validation-pill-row.test.ts.snap
+++ /dev/null
@@ -1,11 +0,0 @@
-// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
-
-exports[`ValidationPillRow > failed-retrying: snapshot 1`] = `"<!--[--><div class="validation-pill svelte-17huavz tone-red expanded" data-lifecycle="failed-retrying"><!--[0--><button type="button" class="pill-header svelte-17huavz" aria-expanded="true"><span class="status-icon svelte-17huavz" aria-hidden="true"><!--[-1--><!--[--><svg></svg><!--]--><!--]--></span> <span class="pill-headline svelte-17huavz">Validation failed — retrying</span> <span class="attempt-tag svelte-17huavz">attempt 1</span> <!--[-1--><!--]--> <span class="pill-spacer svelte-17huavz"></span> <!--[0--><span class="pill-chevron svelte-17huavz" aria-hidden="true"><!--[0--><!--[--><svg></svg><!--]--><!--]--></span><!--]--><!----></button><!--]--> <!--[0--><div class="pill-body svelte-17huavz"><!--[-1--><!--]--> <!--[0--><ul class="issue-list svelte-17huavz"><!--[--><li class="issue-row svelte-17huavz sev-red"><div class="issue-head svelte-17huavz"><span class="category-badge svelte-17huavz">sourcing</span> <span class="severity-badge svelte-17huavz">error</span></div> <!--[0--><div class="issue-field svelte-17huavz"><span class="body-label svelte-17huavz">Claim</span> <p class="body-text svelte-17huavz">Pricing for the Acme Pro plan is $29/mo</p></div><!--]--> <!--[0--><div class="issue-field svelte-17huavz"><span class="body-label svelte-17huavz">Reasoning</span> <p class="body-text svelte-17huavz">No tool result contains pricing for Acme Pro.</p></div><!--]--> <div class="issue-field svelte-17huavz"><span class="body-label svelte-17huavz">Citation</span> <p class="body-text citation svelte-17huavz">Plans: Free, Team. Contact sales for enterprise.</p></div></li><li class="issue-row svelte-17huavz sev-yellow"><div class="issue-head svelte-17huavz"><span class="category-badge svelte-17huavz">no-tools-called</span> <span class="severity-badge svelte-17huavz">warn</span></div> <!--[0--><div class="issue-field svelte-17huavz"><span class="body-label svelte-17huavz">Claim</span> <p class="body-text svelte-17huavz">User has 12 unread emails</p></div><!--]--> <!--[0--><div class="issue-field svelte-17huavz"><span class="body-label svelte-17huavz">Reasoning</span> <p class="body-text svelte-17huavz">Agent did not call any inbox tool before claiming this.</p></div><!--]--> <div class="issue-field svelte-17huavz"><span class="body-label svelte-17huavz">Citation</span> <p class="body-text citation svelte-17huavz citation-empty">(no supporting tool call)</p></div></li><!--]--></ul><!--]--></div><!--]--></div><!--]-->"`;
-
-exports[`ValidationPillRow > failed-terminal: snapshot 1`] = `"<!--[--><div class="validation-pill svelte-17huavz tone-red expanded" data-lifecycle="failed-terminal"><!--[0--><button type="button" class="pill-header svelte-17huavz" aria-expanded="true"><span class="status-icon svelte-17huavz" aria-hidden="true"><!--[-1--><!--[--><svg></svg><!--]--><!--]--></span> <span class="pill-headline svelte-17huavz">Validation failed</span> <span class="attempt-tag svelte-17huavz">attempt 2</span> <!--[-1--><!--]--> <span class="pill-spacer svelte-17huavz"></span> <!--[0--><span class="pill-chevron svelte-17huavz" aria-hidden="true"><!--[0--><!--[--><svg></svg><!--]--><!--]--></span><!--]--><!----></button><!--]--> <!--[0--><div class="pill-body svelte-17huavz"><!--[-1--><!--]--> <!--[0--><ul class="issue-list svelte-17huavz"><!--[--><li class="issue-row svelte-17huavz sev-red"><div class="issue-head svelte-17huavz"><span class="category-badge svelte-17huavz">sourcing</span> <span class="severity-badge svelte-17huavz">error</span></div> <!--[0--><div class="issue-field svelte-17huavz"><span class="body-label svelte-17huavz">Claim</span> <p class="body-text svelte-17huavz">Pricing for the Acme Pro plan is $29/mo</p></div><!--]--> <!--[0--><div class="issue-field svelte-17huavz"><span class="body-label svelte-17huavz">Reasoning</span> <p class="body-text svelte-17huavz">No tool result contains pricing for Acme Pro.</p></div><!--]--> <div class="issue-field svelte-17huavz"><span class="body-label svelte-17huavz">Citation</span> <p class="body-text citation svelte-17huavz">Plans: Free, Team. Contact sales for enterprise.</p></div></li><li class="issue-row svelte-17huavz sev-yellow"><div class="issue-head svelte-17huavz"><span class="category-badge svelte-17huavz">no-tools-called</span> <span class="severity-badge svelte-17huavz">warn</span></div> <!--[0--><div class="issue-field svelte-17huavz"><span class="body-label svelte-17huavz">Claim</span> <p class="body-text svelte-17huavz">User has 12 unread emails</p></div><!--]--> <!--[0--><div class="issue-field svelte-17huavz"><span class="body-label svelte-17huavz">Reasoning</span> <p class="body-text svelte-17huavz">Agent did not call any inbox tool before claiming this.</p></div><!--]--> <div class="issue-field svelte-17huavz"><span class="body-label svelte-17huavz">Citation</span> <p class="body-text citation svelte-17huavz citation-empty">(no supporting tool call)</p></div></li><!--]--></ul><!--]--></div><!--]--></div><!--]-->"`;
-
-exports[`ValidationPillRow > passed-from-pass: snapshot 1`] = `"<!--[--><div class="validation-pill svelte-17huavz tone-green" data-lifecycle="passed-from-pass"><!--[0--><button type="button" class="pill-header svelte-17huavz" aria-expanded="false"><span class="status-icon svelte-17huavz" aria-hidden="true"><!--[1--><!--[--><svg></svg><!--]--><!--]--></span> <span class="pill-headline svelte-17huavz">Validation passed</span> <span class="attempt-tag svelte-17huavz">attempt 1</span> <!--[-1--><!--]--> <span class="pill-spacer svelte-17huavz"></span> <!--[0--><span class="pill-chevron svelte-17huavz" aria-hidden="true"><!--[-1--><!--[--><svg></svg><!--]--><!--]--></span><!--]--><!----></button><!--]--> <!--[-1--><!--]--></div><!--]-->"`;
-
-exports[`ValidationPillRow > passed-from-uncertain: snapshot 1`] = `"<!--[--><div class="validation-pill svelte-17huavz tone-yellow" data-lifecycle="passed-from-uncertain"><!--[0--><button type="button" class="pill-header svelte-17huavz" aria-expanded="false"><span class="status-icon svelte-17huavz" aria-hidden="true"><!--[2--><!--[--><svg></svg><!--]--><!--]--></span> <span class="pill-headline svelte-17huavz">Validation uncertain</span> <span class="attempt-tag svelte-17huavz">attempt 1</span> <!--[-1--><!--]--> <span class="pill-spacer svelte-17huavz"></span> <!--[0--><span class="pill-chevron svelte-17huavz" aria-hidden="true"><!--[-1--><!--[--><svg></svg><!--]--><!--]--></span><!--]--><!----></button><!--]--> <!--[-1--><!--]--></div><!--]-->"`;
-
-exports[`ValidationPillRow > running: snapshot 1`] = `"<!--[--><div class="validation-pill svelte-17huavz tone-blue" data-lifecycle="running"><!--[-1--><div class="pill-header non-interactive svelte-17huavz"><span class="status-icon svelte-17huavz" aria-hidden="true"><!--[0--><span class="spinner-dot svelte-17huavz"></span><!--]--></span> <span class="pill-headline svelte-17huavz">Validating output</span> <span class="attempt-tag svelte-17huavz">attempt 1</span> <!--[-1--><!--]--> <span class="pill-spacer svelte-17huavz"></span> <!--[-1--><!--]--><!----></div><!--]--> <!--[-1--><!--]--></div><!--]-->"`;
diff --git a/tools/chat-replay/README.md b/tools/chat-replay/README.md
index d43f091e5..f1ced7508 100644
--- a/tools/chat-replay/README.md
+++ b/tools/chat-replay/README.md
@@ -1,6 +1,6 @@
 # Friday Chat Replay
 
-Standalone SvelteKit replay app using the same JS toolchain and real chat UI components as `tools/agent-playground`.
+Standalone SvelteKit replay app using the same JS toolchain and real chat UI components as `apps/studio-ui`.
 
 ## Run
 
diff --git a/tools/chat-replay/tsconfig.json b/tools/chat-replay/tsconfig.json
index 33f7cfe18..5821ee8da 100644
--- a/tools/chat-replay/tsconfig.json
+++ b/tools/chat-replay/tsconfig.json
@@ -18,7 +18,7 @@
     "src/**/*.svelte",
     ".svelte-kit/ambient.d.ts",
     "vite.config.ts",
-    "../tools/agent-playground/src/app.d.ts",
+    "../../apps/studio-ui/src/app.d.ts",
     "../types/deno-compat.d.ts"
   ],
   "exclude": ["node_modules", "build", "dist", ".svelte-kit/types"]
diff --git a/tools/friday-launcher/healthsvc_test.go b/tools/friday-launcher/healthsvc_test.go
index 240080d7b..2a8399ce8 100644
--- a/tools/friday-launcher/healthsvc_test.go
+++ b/tools/friday-launcher/healthsvc_test.go
@@ -64,12 +64,12 @@ func TestDeriveStatus_Running(t *testing.T) {
 	}{
 		{
 			"running ready",
-			runningReady("playground"),
+			runningReady("studio-ui"),
 			statusHealthy,
 		},
 		{
 			"running not ready",
-			runningNotReady("playground"),
+			runningNotReady("studio-ui"),
 			statusStarting,
 		},
 		{
@@ -185,7 +185,7 @@ func TestHealthCache_TransitionUpdatesSinceSecs(t *testing.T) {
 	c := NewHealthCache(&sd)
 
 	// First observation — service is starting.
-	c.Update(makeStates(runningNotReady("playground")))
+	c.Update(makeStates(runningNotReady("studio-ui")))
 
 	// Sleep enough for SinceSecs to roll past 0 if the service
 	// stayed in starting. Then transition to healthy.
@@ -193,14 +193,14 @@ func TestHealthCache_TransitionUpdatesSinceSecs(t *testing.T) {
 
 	// If we re-Update with the SAME state, transitionAt must NOT
 	// move — SinceSecs reflects how long it's been starting.
-	c.Update(makeStates(runningNotReady("playground")))
+	c.Update(makeStates(runningNotReady("studio-ui")))
 	got, _, _ := c.Snapshot()
 	if got[0].SinceSecs < 1 {
 		t.Fatalf("expected SinceSecs >= 1 for unchanged status, got %d", got[0].SinceSecs)
 	}
 
 	// Now transition. SinceSecs must reset to 0.
-	c.Update(makeStates(runningReady("playground")))
+	c.Update(makeStates(runningReady("studio-ui")))
 	got, _, _ = c.Snapshot()
 	if got[0].Status != statusHealthy {
 		t.Fatalf("status = %q, want healthy", got[0].Status)
@@ -647,7 +647,7 @@ func TestStartHealthServer_EndToEnd_GET(t *testing.T) {
 func TestHealthStream_DeliversInitialAndTransition(t *testing.T) {
 	var sd atomic.Bool
 	c := NewHealthCache(&sd)
-	c.Update(makeStates(runningNotReady("playground")))
+	c.Update(makeStates(runningNotReady("studio-ui")))
 
 	r := chi.NewRouter()
 	r.Get("/api/launcher-health/stream", handleHealthStream(c))
@@ -685,12 +685,12 @@ func TestHealthStream_DeliversInitialAndTransition(t *testing.T) {
 		t.Fatalf("first event decode: %v", err)
 	}
 	if firstBody.AllHealthy {
-		t.Errorf("initial snapshot AllHealthy = true, want false (playground starting)")
+		t.Errorf("initial snapshot AllHealthy = true, want false (studio-ui starting)")
 	}
 
 	// Transition. SSE consumer should receive a follow-up event
 	// with all_healthy: true.
-	c.Update(makeStates(runningReady("playground")))
+	c.Update(makeStates(runningReady("studio-ui")))
 
 	second, err := readSSEEvent(rd)
 	if err != nil {
@@ -805,7 +805,7 @@ func TestHealthRouter_PanicRecovery(t *testing.T) {
 func TestHealthStream_NoDuplicateInitialEmit(t *testing.T) {
 	var sd atomic.Bool
 	c := NewHealthCache(&sd)
-	c.Update(makeStates(runningNotReady("playground")))
+	c.Update(makeStates(runningNotReady("studio-ui")))
 
 	r := chi.NewRouter()
 	r.Get("/api/launcher-health/stream", handleHealthStream(c))
@@ -844,7 +844,7 @@ func TestHealthStream_NoDuplicateInitialEmit(t *testing.T) {
 	// Drive the transition. Without the drain, the stream's NEXT
 	// event would be a stale duplicate (still NotReady) and the
 	// real transition would land as a third event.
-	c.Update(makeStates(runningReady("playground")))
+	c.Update(makeStates(runningReady("studio-ui")))
 
 	second, err := readSSEEvent(rd)
 	if err != nil {
diff --git a/tools/friday-launcher/integration_test.go b/tools/friday-launcher/integration_test.go
index 38fa7d25c..ddd30afba 100644
--- a/tools/friday-launcher/integration_test.go
+++ b/tools/friday-launcher/integration_test.go
@@ -109,12 +109,12 @@ func buildLauncherAndStubs(t *testing.T) (launcherPath, binDir string) {
 		"friday":         {"18080", "/health"},
 		"link":           {"13100", "/health"},
 		"webhook-tunnel": {"19090", "/health"},
-		// Decision #32: playground probes `/` (the public SvelteKit
+		// Decision #32: studio-ui probes `/` (the public SvelteKit
 		// root), not a sidecar. The stub program reads HEALTH_PATH
 		// and serves the same handler at any path, so the test
 		// observes the real probe rule: launcher hits the path
 		// project.go declares.
-		"playground": {"15200", "/"},
+		"studio-ui": {"15200", "/"},
 	}
 	for name, w := range wrappers {
 		writeWrapper(t, binDir, name, stubBin, w.port, w.healthPath, "")
@@ -140,7 +140,7 @@ func portEnv() []string {
 		"FRIDAY_PORT_FRIDAY=18080",
 		"FRIDAY_PORT_LINK=13100",
 		"FRIDAY_PORT_WEBHOOK_TUNNEL=19090",
-		"FRIDAY_PORT_PLAYGROUND=15200",
+		"FRIDAY_PORT_STUDIO_UI=15200",
 	}
 }
 
@@ -345,9 +345,9 @@ func TestShutdownTimeoutSafety(t *testing.T) {
 		t.Skip("integration test")
 	}
 	launcher, binDir := buildLauncherAndStubs(t)
-	// Replace the playground wrapper with one that ignores SIGTERM.
+	// Replace the studio-ui wrapper with one that ignores SIGTERM.
 	stubBin := filepath.Join(binDir, "_stub")
-	writeWrapper(t, binDir, "playground", stubBin,
+	writeWrapper(t, binDir, "studio-ui", stubBin,
 		"15200", "/", "IGNORE_SIGTERM=1")
 	cmd, _ := startLauncher(t, launcher, binDir)
 	waitHealthy(t)
@@ -934,7 +934,7 @@ func TestUninstall_SweepsOrphansWhenLauncherDead(t *testing.T) {
 	// binDir/_stub, so the kernel-level program path under that
 	// pid lands under binDir — exactly what SweepByBinaryPath
 	// matches against.
-	stub := exec.Command(filepath.Join(binDir, "playground"))
+	stub := exec.Command(filepath.Join(binDir, "studio-ui"))
 	stub.Env = append(os.Environ(), portEnv()...)
 	stub.Stderr = os.Stderr
 	if err := stub.Start(); err != nil {
diff --git a/tools/friday-launcher/project.go b/tools/friday-launcher/project.go
index 143b31682..dbd6b2a52 100644
--- a/tools/friday-launcher/project.go
+++ b/tools/friday-launcher/project.go
@@ -55,7 +55,7 @@ func commonServiceEnv() []string {
 	}
 	// Pin every supervised service to the launcher-owned home. The friday
 	// daemon's getFridayHome() reads FRIDAY_HOME first; sibling services
-	// (link, webhook-tunnel, playground) that resolve their own paths via
+	// (link, webhook-tunnel, studio-ui) that resolve their own paths via
 	// the same helper need the same value, otherwise their data drifts to
 	// the legacy ~/.atlas fallback while the daemon writes to
 	// ~/.friday/local — homes diverge silently.
@@ -167,7 +167,7 @@ func fridayEnv(binDir string) []string {
 	// commonServiceEnv() carries FRIDAY_HOME (which redirects getFridayHome
 	// for every consumer — workspaces, chats, sessions, skills.db,
 	// storage.db, memory, logs, .env), the .env baseline, and shared
-	// LINK_DEV_MODE etc. Sibling services (link, webhook-tunnel, playground)
+	// LINK_DEV_MODE etc. Sibling services (link, webhook-tunnel, studio-ui)
 	// receive the same baseline; pinning FRIDAY_HOME there ensures their
 	// own getFridayHome() resolves to the same launcher-owned home rather
 	// than drifting to the legacy ~/.atlas fallback.
@@ -195,7 +195,7 @@ func fridayEnv(binDir string) []string {
 // any other launcher-side knob: portOverride() reads via os.Getenv,
 // which doesn't see KVs that flow only through commonServiceEnv() into
 // spawned services. Without this call, a user setting
-// `FRIDAY_PORT_PLAYGROUND=15200` in .env would have no effect because
+// `FRIDAY_PORT_STUDIO_UI=15200` in .env would have no effect because
 // the launcher itself never observes the variable.
 func importDotEnvIntoProcessEnv() {
 	for _, kv := range loadDotEnv(filepath.Join(friendlyHome(), ".env")) {
@@ -388,7 +388,7 @@ var startOrder = []string{
 	"friday",
 	"link",
 	"webhook-tunnel",
-	"playground",
+	"studio-ui",
 }
 
 // processSpec captures the minimal launcher-side knowledge of one
@@ -414,7 +414,7 @@ func supervisedProcessNames() []string {
 		"friday",
 		"link",
 		"webhook-tunnel",
-		"playground",
+		"studio-ui",
 	}
 }
 
@@ -425,7 +425,7 @@ func supervisedProcessNames() []string {
 // The actual binaries are expected to live alongside the launcher in
 // the platform tarball. For QA / stub-based local dev, individual
 // ports can be overridden via env vars FRIDAY_PORT_<NAME>
-// (e.g. FRIDAY_PORT_PLAYGROUND=15200) so that tests don't collide
+// (e.g. FRIDAY_PORT_STUDIO_UI=15200) so that tests don't collide
 // with a developer's real Friday instance running on the production
 // ports.
 func supervisedProcesses(binDir string) []processSpec {
@@ -509,7 +509,7 @@ func supervisedProcesses(binDir string) []processSpec {
 			// Decision #32: the readiness probe MUST exercise the
 			// real handler stack at a public entry point — that's
 			// what makes "all healthy" actually mean "all usable".
-			// Playground is a SvelteKit app whose root path is a
+			// studio-ui is a SvelteKit app whose root path is a
 			// public landing; probing `/` catches the SvelteKit-
 			// not-yet-bound race that a sidecar `/api/health` would
 			// silently green-light. project_test.go pins this so a
@@ -518,7 +518,7 @@ func supervisedProcesses(binDir string) []processSpec {
 			// Carries .env so EXTERNAL_DAEMON_URL / EXTERNAL_TUNNEL_URL
 			// reach static-server.ts, which injects them into the
 			// served HTML for the browser's window.__FRIDAY_CONFIG__.
-			name: "playground", binary: filepath.Join(binDir, "playground"),
+			name: "studio-ui", binary: filepath.Join(binDir, "studio-ui"),
 			env:        commonServiceEnv(),
 			healthPort: "5200", healthPath: "/",
 		},
@@ -549,10 +549,9 @@ func supervisedProcesses(binDir string) []processSpec {
 			// tools/webhook-tunnel/main.go:11 reads TUNNEL_PORT
 			// (default 9090).
 			specs[i].env = append(specs[i].env, "TUNNEL_PORT="+port)
-		case "playground":
-			// tools/agent-playground/static-server.ts:18 reads
-			// PLAYGROUND_PORT (default 5200).
-			specs[i].env = append(specs[i].env, "PLAYGROUND_PORT="+port)
+		case "studio-ui":
+			// apps/studio-ui/static-server.ts reads STUDIO_UI_PORT (default 5200).
+			specs[i].env = append(specs[i].env, "STUDIO_UI_PORT="+port)
 		case "nats-server":
 			// nats-server uses --port <n> at index 1 of its args; the
 			// monitoring --http_port stays on the default 8222 so the
@@ -575,14 +574,14 @@ func portOverride(name string) string {
 	return osGetenv(envName)
 }
 
-// playgroundURL returns the loopback URL the tray opens in the user's
+// studioUIURL returns the loopback URL the tray opens in the user's
 // browser when the platform reaches "all healthy". Honors the
-// FRIDAY_PORT_playground override so installs that move playground off
+// FRIDAY_PORT_studio-ui override so installs that move studio-ui off
 // 5200 (e.g. to avoid collision with another local Friday instance) get
 // the right URL — without this the tray click silently lands on the
 // wrong port and the user sees a "can't connect" page.
-func playgroundURL() string {
-	port := portOverride("playground")
+func studioUIURL() string {
+	port := portOverride("studio-ui")
 	if port == "" {
 		port = "5200"
 	}
@@ -625,7 +624,7 @@ func newProjectFromSpecs(specs []processSpec) *types.Project {
 				// = 62s window before process-compose declares the
 				// process unhealthy and restarts it. The friday daemon
 				// alone takes ~24s on first boot (workspace scan + skill
-				// bundle hashing + cron registration), and playground's
+				// bundle hashing + cron registration), and studio-ui's
 				// SvelteKit-first-render takes another ~6-8s. The old
 				// 12s window (5 × 2s) was enough for warm restarts but
 				// not for the very first launch after install — every
diff --git a/tools/friday-launcher/project_env_test.go b/tools/friday-launcher/project_env_test.go
index a0b7a74e5..d69257bd7 100644
--- a/tools/friday-launcher/project_env_test.go
+++ b/tools/friday-launcher/project_env_test.go
@@ -11,7 +11,7 @@ import (
 
 // Verify the .env values the installer writes flow through to all
 // supervised services. Regression guard: previously only `friday`
-// got .env, so EXTERNAL_DAEMON_URL never reached `playground` and the
+// got .env, so EXTERNAL_DAEMON_URL never reached `studio-ui` and the
 // browser-side window.__FRIDAY_CONFIG__ stayed empty.
 func TestCommonServiceEnvFlowsToAllServices(t *testing.T) {
 	tmpHome := t.TempDir()
@@ -32,7 +32,7 @@ LINK_DEV_MODE=true
 	t.Setenv("HOME", tmpHome)
 
 	specs := supervisedProcesses("/tmp/bin")
-	required := []string{"friday", "link", "webhook-tunnel", "playground"}
+	required := []string{"friday", "link", "webhook-tunnel", "studio-ui"}
 	for _, name := range required {
 		var found *processSpec
 		for i := range specs {
@@ -128,7 +128,7 @@ func TestFridayEnv_PinsUvCachesUnderFridayHome(t *testing.T) {
 }
 
 // TestImportDotEnvIntoProcessEnv_PopulatesPortOverrides closes the
-// gap that made FRIDAY_PORT_PLAYGROUND=15200 in ~/.friday/local/.env
+// gap that made FRIDAY_PORT_STUDIO_UI=15200 in ~/.friday/local/.env
 // silently ignored: portOverride() reads via os.Getenv, but pre-fix
 // the .env values flowed only into spawned-service envs (via
 // commonServiceEnv) — never into the launcher's own process env.
@@ -141,25 +141,25 @@ func TestImportDotEnvIntoProcessEnv_PopulatesPortOverrides(t *testing.T) {
 		t.Fatal(err)
 	}
 	envFile := filepath.Join(envDir, ".env")
-	envContent := "FRIDAY_PORT_PLAYGROUND=15200\nLINK_DEV_MODE=true\n"
+	envContent := "FRIDAY_PORT_STUDIO_UI=15200\nLINK_DEV_MODE=true\n"
 	if err := os.WriteFile(envFile, []byte(envContent), 0o644); err != nil {
 		t.Fatal(err)
 	}
 	t.Setenv("HOME", tmpHome)
 	// Make sure the test starts from a clean slate for the keys we
 	// expect importDotEnvIntoProcessEnv to populate.
-	t.Setenv("FRIDAY_PORT_PLAYGROUND", "")
-	_ = os.Unsetenv("FRIDAY_PORT_PLAYGROUND")
+	t.Setenv("FRIDAY_PORT_STUDIO_UI", "")
+	_ = os.Unsetenv("FRIDAY_PORT_STUDIO_UI")
 
 	importDotEnvIntoProcessEnv()
 
-	if got := os.Getenv("FRIDAY_PORT_PLAYGROUND"); got != "15200" {
-		t.Errorf("FRIDAY_PORT_PLAYGROUND after import = %q, want 15200", got)
+	if got := os.Getenv("FRIDAY_PORT_STUDIO_UI"); got != "15200" {
+		t.Errorf("FRIDAY_PORT_STUDIO_UI after import = %q, want 15200", got)
 	}
 	// portOverride consults os.Getenv with the same translation rule the
 	// public contract documents (uppercase, hyphens → underscores).
-	if got := portOverride("playground"); got != "15200" {
-		t.Errorf("portOverride(playground) after import = %q, want 15200", got)
+	if got := portOverride("studio-ui"); got != "15200" {
+		t.Errorf("portOverride(studio-ui) after import = %q, want 15200", got)
 	}
 }
 
@@ -245,14 +245,14 @@ func TestImportDotEnvIntoProcessEnv_PreservesExistingEnv(t *testing.T) {
 // readiness probe (which the original portOverride code already did)
 // but also propagate the port into the supervised binary itself —
 // either as a CLI flag (friday's --port) or an env var (LINK_PORT,
-// TUNNEL_PORT, PLAYGROUND_PORT). Without this propagation the launcher
+// TUNNEL_PORT, STUDIO_UI_PORT). Without this propagation the launcher
 // would probe the override port while the binary stays on its hardcoded
 // default, and the supervisor stays "starting" forever.
 func TestSupervisedProcesses_PortOverridesPropagate(t *testing.T) {
 	t.Setenv("FRIDAY_PORT_FRIDAY", "18080")
 	t.Setenv("FRIDAY_PORT_LINK", "13100")
 	t.Setenv("FRIDAY_PORT_WEBHOOK_TUNNEL", "19090")
-	t.Setenv("FRIDAY_PORT_PLAYGROUND", "15200")
+	t.Setenv("FRIDAY_PORT_STUDIO_UI", "15200")
 
 	specs := supervisedProcesses("/tmp/bin")
 
@@ -267,7 +267,7 @@ func TestSupervisedProcesses_PortOverridesPropagate(t *testing.T) {
 		{name: "friday", check: "args", wantArg: "--port", wantPort: "18080"},
 		{name: "link", check: "env", wantEnv: "LINK_PORT=13100", wantPort: "13100"},
 		{name: "webhook-tunnel", check: "env", wantEnv: "TUNNEL_PORT=19090", wantPort: "19090"},
-		{name: "playground", check: "env", wantEnv: "PLAYGROUND_PORT=15200", wantPort: "15200"},
+		{name: "studio-ui", check: "env", wantEnv: "STUDIO_UI_PORT=15200", wantPort: "15200"},
 	}
 
 	for _, tc := range cases {
@@ -306,24 +306,24 @@ func TestSupervisedProcesses_PortOverridesPropagate(t *testing.T) {
 	}
 }
 
-// TestPlaygroundURL_HonorsPortOverride asserts the tray opens the
-// correct URL when the playground port is overridden. Without this
+// TestStudioUIURL_HonorsPortOverride asserts the tray opens the
+// correct URL when the studio-ui port is overridden. Without this
 // the tray click after a port override silently lands on
 // http://localhost:5200 (default) and the user sees connection
 // refused.
-func TestPlaygroundURL_HonorsPortOverride(t *testing.T) {
-	if got := playgroundURL(); got != "http://localhost:5200" {
-		t.Errorf("default playgroundURL = %q, want http://localhost:5200", got)
+func TestStudioUIURL_HonorsPortOverride(t *testing.T) {
+	if got := studioUIURL(); got != "http://localhost:5200" {
+		t.Errorf("default studioUIURL = %q, want http://localhost:5200", got)
 	}
-	t.Setenv("FRIDAY_PORT_PLAYGROUND", "15200")
-	if got := playgroundURL(); got != "http://localhost:15200" {
-		t.Errorf("overridden playgroundURL = %q, want http://localhost:15200", got)
+	t.Setenv("FRIDAY_PORT_STUDIO_UI", "15200")
+	if got := studioUIURL(); got != "http://localhost:15200" {
+		t.Errorf("overridden studioUIURL = %q, want http://localhost:15200", got)
 	}
 }
 
 // TestCommonServiceEnv_EmitsFridayHome guards the contract that
 // drives the entire ~/.friday/local redirect: every supervised
-// service (friday daemon, link, webhook-tunnel, playground) must
+// service (friday daemon, link, webhook-tunnel, studio-ui) must
 // receive FRIDAY_HOME so getFridayHome() in @atlas/utils resolves
 // to the launcher-owned home. Without this, services fall back to
 // the legacy ~/.atlas location and homes silently drift apart —
@@ -339,7 +339,7 @@ func TestCommonServiceEnv_EmitsFridayHome(t *testing.T) {
 	want := "FRIDAY_HOME=" + filepath.Join(tmpHome, ".friday", "local")
 
 	specs := supervisedProcesses("/tmp/bin")
-	required := []string{"friday", "link", "webhook-tunnel", "playground"}
+	required := []string{"friday", "link", "webhook-tunnel", "studio-ui"}
 	for _, name := range required {
 		var found *processSpec
 		for i := range specs {
@@ -375,7 +375,7 @@ func TestCommonServiceEnv_EmitsFridayConfigPath(t *testing.T) {
 	want := "FRIDAY_CONFIG_PATH=" + filepath.Join(tmpHome, ".friday", "local")
 
 	specs := supervisedProcesses("/tmp/bin")
-	required := []string{"friday", "link", "webhook-tunnel", "playground"}
+	required := []string{"friday", "link", "webhook-tunnel", "studio-ui"}
 	for _, name := range required {
 		var found *processSpec
 		for i := range specs {
diff --git a/tools/friday-launcher/project_test.go b/tools/friday-launcher/project_test.go
index 80e087818..e25cbfc84 100644
--- a/tools/friday-launcher/project_test.go
+++ b/tools/friday-launcher/project_test.go
@@ -7,29 +7,29 @@ import (
 	"testing"
 )
 
-// TestPlaygroundProbePath_IsRoot pins the playground readiness probe
+// TestStudioUIProbePath_IsRoot pins the studio-ui readiness probe
 // to "/" — the public SvelteKit landing page — per Decision #32. A
 // sidecar like "/api/health" returns 200 even before SvelteKit has
 // bound the root route, which silently green-lights "all healthy"
 // while a user-side request to / would still 404. Pinning this
 // catches a future refactor that quietly reverts to the sidecar.
-func TestPlaygroundProbePath_IsRoot(t *testing.T) {
+func TestStudioUIProbePath_IsRoot(t *testing.T) {
 	specs := supervisedProcesses("/tmp/dummy-bin")
 	for _, s := range specs {
-		if s.name != "playground" {
+		if s.name != "studio-ui" {
 			continue
 		}
 		if s.healthPath != "/" {
-			t.Errorf("playground healthPath = %q, want %q (Decision #32)",
+			t.Errorf("studio-ui healthPath = %q, want %q (Decision #32)",
 				s.healthPath, "/")
 		}
 		if s.healthPort != "5200" {
-			t.Errorf("playground healthPort = %q, want %q",
+			t.Errorf("studio-ui healthPort = %q, want %q",
 				s.healthPort, "5200")
 		}
 		return
 	}
-	t.Fatal("playground not found in supervisedProcesses")
+	t.Fatal("studio-ui not found in supervisedProcesses")
 }
 
 // TestSupervisedProcessesProbeShape covers the universal contract —
@@ -67,7 +67,7 @@ func TestSupervisedProcessesPinSet(t *testing.T) {
 		"friday",
 		"link",
 		"webhook-tunnel",
-		"playground",
+		"studio-ui",
 	}
 	specs := supervisedProcesses("/tmp/dummy-bin")
 	got := make([]string, len(specs))
@@ -141,7 +141,7 @@ func TestCommonServiceEnv_RespectsExplicitOverride(t *testing.T) {
 // Supervisor.RestartAll iterates over when calling RestartProcess
 // on each supervised service. nats-server must come first so the
 // friday daemon's NatsManager tcpProbe finds an external NATS on
-// :4222 and reuses it instead of spawning its own; playground
+// :4222 and reuses it instead of spawning its own; studio-ui
 // comes last so it doesn't surface a spurious "backend down" UI
 // flash while its upstreams are still warming up. A reorder here
 // without a corresponding probe/dependency review can cause the
@@ -149,7 +149,7 @@ func TestCommonServiceEnv_RespectsExplicitOverride(t *testing.T) {
 // (Decision #?: 12s → 62s) was supposed to eliminate.
 func TestStartOrderConfig(t *testing.T) {
 	want := []string{
-		"nats-server", "friday", "link", "webhook-tunnel", "playground",
+		"nats-server", "friday", "link", "webhook-tunnel", "studio-ui",
 	}
 	if !slices.Equal(startOrder, want) {
 		t.Errorf("startOrder mismatch:\n want %q\n  got %q", want, startOrder)
diff --git a/tools/friday-launcher/tray.go b/tools/friday-launcher/tray.go
index 07518e914..f42b5a6e4 100644
--- a/tools/friday-launcher/tray.go
+++ b/tools/friday-launcher/tray.go
@@ -302,7 +302,7 @@ func (t *trayController) openBrowser(reason string) {
 		log.Info("browser-open suppressed by --no-browser", "reason", reason)
 		return
 	}
-	url := playgroundURL()
+	url := studioUIURL()
 	log.Info("opening browser", "reason", reason, "url", url)
 	if err := openURLInBrowser(url); err != nil {
 		log.Error("openBrowser failed", "error", err)
diff --git a/tools/pty-server/README.md b/tools/pty-server/README.md
index 0bfd8252a..f7ba1e6ee 100644
--- a/tools/pty-server/README.md
+++ b/tools/pty-server/README.md
@@ -1,6 +1,6 @@
 # pty-server
 
-WebSocket↔PTY bridge for the cheatsheet terminal in `agent-playground`.
+WebSocket↔PTY bridge for the cheatsheet terminal in `studio-ui`.
 Replaces the prior Node/`node-pty`/`tsx` server (`server.ts`) with a
 single static Go binary that runs on Linux, macOS (Intel + ARM), and
 Windows (amd64).
@@ -64,7 +64,7 @@ Default shells:
 `GET /health` → `200 {"ok":true}` with CORS headers. `OPTIONS /health` → `204`.
 
 **The path is `/health`, not `/healthz`.** Other Go services in this repo use
-`/healthz` but the cheatsheet client (`tools/agent-playground/src/lib/components/shared/cheatsheet.svelte:44`)
+`/healthz` but the cheatsheet client (`apps/studio-ui/src/lib/components/shared/cheatsheet.svelte:44`)
 hardcodes `/pty-proxy/health`. Do not "harmonize" the path without updating
 the client.
 
@@ -114,7 +114,7 @@ that's been removed. From a fresh clone you need a built `atlas` available:
 ```
 deno task compile          # produces ./bin/atlas
 export PATH="$PWD/bin:$PATH"
-deno task playground       # cheatsheet terminal will pick it up
+deno task studio-ui        # cheatsheet terminal will pick it up
 ```
 
 Or simply rely on the shell's normal `which atlas` — if your dev box
diff --git a/tools/pty-server/main.go b/tools/pty-server/main.go
index 427356824..0ef03f618 100644
--- a/tools/pty-server/main.go
+++ b/tools/pty-server/main.go
@@ -79,7 +79,7 @@ func run(cfg Config) error {
 	mux := http.NewServeMux()
 
 	// /health — kept as /health (NOT /healthz) to match the cheatsheet
-	// client at tools/agent-playground/.../cheatsheet.svelte:44.
+	// client at apps/studio-ui/.../cheatsheet.svelte:44.
 	// Other Go services in this repo use /healthz; do not "harmonize"
 	// this path without updating the client.
 	mux.HandleFunc("/health", handleHealth)
diff --git a/tools/qa/live-daemon/scenarios/activity-sidebar-ui.ts b/tools/qa/live-daemon/scenarios/activity-sidebar-ui.ts
index 5fa036953..3f7e8e89f 100644
--- a/tools/qa/live-daemon/scenarios/activity-sidebar-ui.ts
+++ b/tools/qa/live-daemon/scenarios/activity-sidebar-ui.ts
@@ -131,16 +131,16 @@ async function materializeFixture(): Promise<string> {
 async function startPlayground(
   daemon: DaemonHandle,
 ): Promise<{ port: number; process: Deno.ChildProcess; baseUrl: string }> {
-  await runChecked("deno", ["task", "-f", "@atlas/agent-playground", "sync"], {
+  await runChecked("deno", ["task", "-f", "@atlas/studio-ui", "sync"], {
     cwd: WORKTREE_ROOT,
     timeoutMs: 120_000,
   });
 
   const port = pickPort();
-  const logDir = join(daemon.fridayHome, "playground");
+  const logDir = join(daemon.fridayHome, "studio-ui");
   const proc = new Deno.Command("npx", {
     args: ["vite", "dev", "--host", "127.0.0.1", "--port", String(port), "--strictPort"],
-    cwd: join(WORKTREE_ROOT, "tools/agent-playground"),
+    cwd: join(WORKTREE_ROOT, "apps/studio-ui"),
     env: {
       ...Deno.env.toObject(),
       EXTERNAL_DAEMON_URL: daemon.baseUrl,
diff --git a/vitest.config.ts b/vitest.config.ts
index 8c1be08e5..e45b0b4f1 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -12,12 +12,9 @@ export default defineConfig({
       // the ones component tests reach for, and reproduce the `$lib`
       // alias so route-component tests (e.g. the export preview page)
       // resolve the same way the dev server does.
-      $lib: fileURLToPath(new URL("./tools/agent-playground/src/lib", import.meta.url)),
+      $lib: fileURLToPath(new URL("./apps/studio-ui/src/lib", import.meta.url)),
       "$app/environment": fileURLToPath(
-        new URL(
-          "./tools/agent-playground/src/lib/__test-stubs__/app-environment.ts",
-          import.meta.url,
-        ),
+        new URL("./apps/studio-ui/src/lib/__test-stubs__/app-environment.ts", import.meta.url),
       ),
     },
   },
@@ -32,7 +29,7 @@ export default defineConfig({
       // Component test pulls in a Svelte-table alpha whose dist files
       // import without extensions; vitest's ESM resolver rejects them.
       // The component itself ships fine — only the test loader is broken.
-      "tools/agent-playground/src/lib/components/mcp/mcp-credentials-panel.test.ts",
+      "apps/studio-ui/src/lib/components/mcp/mcp-credentials-panel.test.ts",
     ],
     update: process.env.CI ? "none" : "new",
     // `@tanstack/svelte-query` ships a `.svelte` file