diff --git a/.changeset/remove-dead-limbo-timeout.md b/.changeset/remove-dead-limbo-timeout.md
new file mode 100644
index 00000000..14b1e5ab
--- /dev/null
+++ b/.changeset/remove-dead-limbo-timeout.md
@@ -0,0 +1,38 @@
+---
+"@paddock/server": minor
+"@paddock/web": patch
+---
+
+Remove the `recovery.limboTimeoutMs` lever, which never did anything
+
+`limboTimeoutMs` / `PADDOCK_RECOVERY_LIMBO_MS` was parsed (`config.ts`),
+defaulted (`recovery-config.ts`), sanitised, resolved per-project, carried into
+the web types — and **read by nothing**. There were zero consumers in
+`packages/server/src`. It has been inert since it was introduced with #301.
+
+The docs were honest about it (*"Backstop timer ships in a follow-up"*), but the
+Settings UI was not: `instance-config.ts` listed it as an `editable: true` field
+alongside levers that work, with no indication it was a no-op. Anyone who set it
+— including this project's own dev box, which exports
+`PADDOCK_RECOVERY_LIMBO_MS=60000` — got silence and no way to tell.
+
+Its original purpose was a backstop for a chat wedged "running" with no way out.
+**#528 removed that need**: Stop now works during a chat's background phase, so a
+wedged session is escapable from the UI rather than needing a timer to notice it.
+Rather than implement a timer nothing is waiting for, the lever goes.
+
+Removed end to end: the config key and env var, the Settings field, the
+`RecoveryConfig` / `RecoveryOverride` member, and the docs rows describing it.
+
+**Nothing breaks for existing installs.** `sanitizeRecoveryOverride` is an
+allowlist, so a `limboTimeoutMs:` left in a `project.yaml` or
+`paddock.config.yaml` is silently ignored — exactly the effect it has today. The
+env var simply stops being read. No `schemaVersion` bump: the bump rule is
+"remove a *load-bearing* key", and this one carried no load, which is the point.
+
+Worth knowing if you provision Paddock with config management: any
+`PADDOCK_RECOVERY_LIMBO_MS` in your environment is now dead weight and can be
+dropped.
+
+The remaining recovery levers — `surfaceKilledTask`, `autoReDrive`,
+`debounceMs`, `maxRetries` — are unaffected and still work.
diff --git a/packages/server/src/config.ts b/packages/server/src/config.ts
index e2f45d67..a8437167 100644
--- a/packages/server/src/config.ts
+++ b/packages/server/src/config.ts
@@ -628,7 +628,6 @@ export interface PaddockConfigFile {
     autoReDrive?: boolean | string;
     debounceMs?: number | string;
     maxRetries?: number | string;
-    limboTimeoutMs?: number | string;
   };
   /**
    * Inbound composer-attachment config (issue #328). Every field optional; a
@@ -1185,11 +1184,6 @@ function loadRecoveryConfig(file?: PaddockConfigFile["recovery"]): RecoveryConfi
       f.maxRetries,
       DEFAULT_RECOVERY.maxRetries,
     ),
-    limboTimeoutMs: loadRecoveryInt(
-      "PADDOCK_RECOVERY_LIMBO_MS",
-      f.limboTimeoutMs,
-      DEFAULT_RECOVERY.limboTimeoutMs,
-    ),
   };
 }
 
diff --git a/packages/server/src/instance-config.ts b/packages/server/src/instance-config.ts
index 0382e94f..3b45790b 100644
--- a/packages/server/src/instance-config.ts
+++ b/packages/server/src/instance-config.ts
@@ -329,7 +329,6 @@ export const FIELDS: readonly FieldSpec[] = [
   { key: "recovery.autoReDrive", group: "recovery", label: "Auto re-drive", type: "boolean", envVars: ["PADDOCK_RECOVERY_AUTODRIVE"], default: DEFAULT_RECOVERY.autoReDrive, editable: true, coerce: asBool },
   { key: "recovery.debounceMs", group: "recovery", label: "Debounce (ms)", type: "number", envVars: ["PADDOCK_RECOVERY_DEBOUNCE_MS"], default: DEFAULT_RECOVERY.debounceMs, editable: true, coerce: nonNegInt },
   { key: "recovery.maxRetries", group: "recovery", label: "Max retries", type: "number", envVars: ["PADDOCK_RECOVERY_MAX_RETRIES"], default: DEFAULT_RECOVERY.maxRetries, editable: true, coerce: nonNegInt },
-  { key: "recovery.limboTimeoutMs", group: "recovery", label: "Limbo timeout (ms)", type: "number", envVars: ["PADDOCK_RECOVERY_LIMBO_MS"], default: DEFAULT_RECOVERY.limboTimeoutMs, editable: true, coerce: nonNegInt },
 
   // Attachments (issue #328).
   { key: "attachments.enabled", group: "attachments", label: "Enabled", type: "boolean", envVars: ["PADDOCK_ATTACHMENTS_ENABLED"], default: DEFAULT_ATTACHMENTS.enabled, editable: true, coerce: asBool },
diff --git a/packages/server/src/recovery-config.ts b/packages/server/src/recovery-config.ts
index f9d332ab..07bb854e 100644
--- a/packages/server/src/recovery-config.ts
+++ b/packages/server/src/recovery-config.ts
@@ -68,12 +68,6 @@ export interface RecoveryConfig {
    * `PADDOCK_RECOVERY_MAX_RETRIES`.
    */
   maxRetries: number;
-  /**
-   * Layer 2 backstop — if a kept-alive keeper session shows no activity for this
-   * many ms after a killed-task notification, surface it as stuck. `0` disables
-   * the backstop (the default). Env `PADDOCK_RECOVERY_LIMBO_MS`.
-   */
-  limboTimeoutMs: number;
 }
 
 /**
@@ -91,7 +85,6 @@ export const DEFAULT_RECOVERY: RecoveryConfig = Object.freeze({
   autoReDrive: false,
   debounceMs: 5000,
   maxRetries: 1,
-  limboTimeoutMs: 0,
 });
 
 /** The `<status>` values a killed-at-turn-boundary task notification carries. */
@@ -128,7 +121,6 @@ export function sanitizeRecoveryOverride(value: unknown): RecoveryOverride | und
   if (typeof o.autoReDrive === "boolean") out.autoReDrive = o.autoReDrive;
   if (isNonNegativeInt(o.debounceMs)) out.debounceMs = o.debounceMs;
   if (isNonNegativeInt(o.maxRetries)) out.maxRetries = o.maxRetries;
-  if (isNonNegativeInt(o.limboTimeoutMs)) out.limboTimeoutMs = o.limboTimeoutMs;
   return Object.keys(out).length > 0 ? out : undefined;
 }
 
@@ -150,6 +142,5 @@ export function resolveRecoveryConfig(
     autoReDrive: clean.autoReDrive ?? instanceDefault.autoReDrive,
     debounceMs: clean.debounceMs ?? instanceDefault.debounceMs,
     maxRetries: clean.maxRetries ?? instanceDefault.maxRetries,
-    limboTimeoutMs: clean.limboTimeoutMs ?? instanceDefault.limboTimeoutMs,
   };
 }
diff --git a/packages/server/test/integration/instance-config.test.ts b/packages/server/test/integration/instance-config.test.ts
index ca26ee5a..6e83fa02 100644
--- a/packages/server/test/integration/instance-config.test.ts
+++ b/packages/server/test/integration/instance-config.test.ts
@@ -135,7 +135,6 @@ describe("integration: instance-config (#385)", () => {
       patch: {
         "recovery.debounceMs": null,
         "recovery.maxRetries": null,
-        "recovery.limboTimeoutMs": null,
       },
     });
     expect(res.statusCode).toBe(200);
@@ -143,7 +142,6 @@ describe("integration: instance-config (#385)", () => {
     const recovery = (await readYaml()).recovery ?? {};
     expect(recovery.debounceMs).toBeUndefined();
     expect(recovery.maxRetries).toBeUndefined();
-    expect(recovery.limboTimeoutMs).toBeUndefined();
 
     // And the screen reports the built-in defaults as pending, not zeros.
     const fields = flat(await get());
diff --git a/packages/server/test/integration/routes.test.ts b/packages/server/test/integration/routes.test.ts
index 92f63d5b..150aeca7 100644
--- a/packages/server/test/integration/routes.test.ts
+++ b/packages/server/test/integration/routes.test.ts
@@ -84,7 +84,6 @@ describe("integration: REST route coverage (real app, fake claude)", () => {
       autoReDrive: false,
       debounceMs: 5000,
       maxRetries: 1,
-      limboTimeoutMs: 0,
     });
     // With no PADDOCK_MODELS set, the full catalog is offered (unchanged behaviour):
     // every catalog id is present + the keeper default is the real default (#457).
diff --git a/packages/server/test/unit/config.test.ts b/packages/server/test/unit/config.test.ts
index 1cc55119..d993f3ca 100644
--- a/packages/server/test/unit/config.test.ts
+++ b/packages/server/test/unit/config.test.ts
@@ -201,7 +201,6 @@ describe("loadPaddockConfig: recovery (#301)", () => {
     "PADDOCK_RECOVERY_AUTODRIVE",
     "PADDOCK_RECOVERY_DEBOUNCE_MS",
     "PADDOCK_RECOVERY_MAX_RETRIES",
-    "PADDOCK_RECOVERY_LIMBO_MS",
   ];
 
   beforeEach(async () => {
@@ -227,7 +226,6 @@ describe("loadPaddockConfig: recovery (#301)", () => {
       autoReDrive: false,
       debounceMs: 5000,
       maxRetries: 1,
-      limboTimeoutMs: 0,
     });
   });
 
@@ -244,9 +242,8 @@ describe("loadPaddockConfig: recovery (#301)", () => {
   it("parses the numeric knobs from env", () => {
     process.env.PADDOCK_RECOVERY_DEBOUNCE_MS = "1500";
     process.env.PADDOCK_RECOVERY_MAX_RETRIES = "3";
-    process.env.PADDOCK_RECOVERY_LIMBO_MS = "30000";
     const r = loadPaddockConfig().recovery;
-    expect(r).toMatchObject({ debounceMs: 1500, maxRetries: 3, limboTimeoutMs: 30000 });
+    expect(r).toMatchObject({ debounceMs: 1500, maxRetries: 3 });
   });
 
   it.each(["-1", "1.5", "nonsense", ""])(
@@ -426,7 +423,6 @@ describe("loadPaddockConfig: YAML instance-config file (#270)", () => {
         "  surfaceKilledTask: false",
         "  autoReDrive: true",
         "  debounceMs: 2500",
-        "  limboTimeoutMs: 60000",
         "gitAuthor:",
         "  name: Ed",
         "  email: ed@example.com",
@@ -455,7 +451,6 @@ describe("loadPaddockConfig: YAML instance-config file (#270)", () => {
       autoReDrive: true,
       debounceMs: 2500,
       maxRetries: 1,
-      limboTimeoutMs: 60000,
     });
     expect(cfg.gitAuthor).toEqual({ name: "Ed", email: "ed@example.com" });
   });
diff --git a/packages/server/test/unit/instance-config.test.ts b/packages/server/test/unit/instance-config.test.ts
index c306277f..8be7ebe5 100644
--- a/packages/server/test/unit/instance-config.test.ts
+++ b/packages/server/test/unit/instance-config.test.ts
@@ -230,7 +230,7 @@ describe("instance-config (#385)", () => {
     // zero: `maxRetries: 0` disables recovery retries, `debounceMs: 0` removes
     // the debounce. The clear must produce `value: null` (the writer's delete).
     it("clears a nonNegInt field with null / empty string rather than writing 0 (#723)", () => {
-      for (const key of ["recovery.debounceMs", "recovery.maxRetries", "recovery.limboTimeoutMs"]) {
+      for (const key of ["recovery.debounceMs", "recovery.maxRetries"]) {
         expect(validatePatch({ [key]: null })).toEqual([{ key, value: null }]);
         expect(validatePatch({ [key]: "" })).toEqual([{ key, value: null }]);
       }
diff --git a/packages/server/test/unit/recovery-config.test.ts b/packages/server/test/unit/recovery-config.test.ts
index 8c379e98..ed0af694 100644
--- a/packages/server/test/unit/recovery-config.test.ts
+++ b/packages/server/test/unit/recovery-config.test.ts
@@ -20,7 +20,6 @@ describe("DEFAULT_RECOVERY", () => {
       autoReDrive: false,
       debounceMs: 5000,
       maxRetries: 1,
-      limboTimeoutMs: 0,
     });
   });
 });
@@ -45,11 +44,16 @@ describe("sanitizeRecoveryOverride", () => {
         autoReDrive: "yes", // wrong type → dropped
         debounceMs: 1234,
         maxRetries: -1, // negative → dropped
-        limboTimeoutMs: 2.5, // non-integer → dropped
       }),
     ).toEqual({ surfaceKilledTask: false, debounceMs: 1234 });
   });
 
+  it("drops a non-integer numeric knob", () => {
+    expect(sanitizeRecoveryOverride({ debounceMs: 2.5, maxRetries: 1 })).toEqual({
+      maxRetries: 1,
+    });
+  });
+
   it("returns undefined for a non-object / empty / all-invalid value", () => {
     expect(sanitizeRecoveryOverride(undefined)).toBeUndefined();
     expect(sanitizeRecoveryOverride(null)).toBeUndefined();
@@ -60,9 +64,9 @@ describe("sanitizeRecoveryOverride", () => {
   });
 
   it("accepts 0 for the numeric knobs (a valid non-negative integer)", () => {
-    expect(sanitizeRecoveryOverride({ debounceMs: 0, limboTimeoutMs: 0 })).toEqual({
+    expect(sanitizeRecoveryOverride({ debounceMs: 0, maxRetries: 0 })).toEqual({
       debounceMs: 0,
-      limboTimeoutMs: 0,
+      maxRetries: 0,
     });
   });
 });
@@ -73,7 +77,6 @@ describe("resolveRecoveryConfig", () => {
     autoReDrive: false,
     debounceMs: 5000,
     maxRetries: 1,
-    limboTimeoutMs: 0,
   };
 
   it("inherits every field from the instance default when there is no override", () => {
@@ -88,7 +91,6 @@ describe("resolveRecoveryConfig", () => {
       autoReDrive: true,
       debounceMs: 5000,
       maxRetries: 1,
-      limboTimeoutMs: 0,
     });
   });
 
diff --git a/packages/web/src/components/ChatPane.test.tsx b/packages/web/src/components/ChatPane.test.tsx
index 5ec954c8..d286a6c9 100644
--- a/packages/web/src/components/ChatPane.test.tsx
+++ b/packages/web/src/components/ChatPane.test.tsx
@@ -1569,7 +1569,6 @@ describe("ChatPane: killed background-task recovery (#301)", () => {
         autoReDrive: false,
         debounceMs: 5000,
         maxRetries: 1,
-        limboTimeoutMs: 0,
       },
     });
     const loadHistory = vi.fn().mockResolvedValue(killedHistory);
diff --git a/packages/web/src/lib/types.ts b/packages/web/src/lib/types.ts
index 5a06c33a..01199b92 100644
--- a/packages/web/src/lib/types.ts
+++ b/packages/web/src/lib/types.ts
@@ -30,8 +30,6 @@ export interface RecoveryConfig {
   debounceMs: number;
   /** Layer 3 — per-session auto re-drive retry cap. */
   maxRetries: number;
-  /** Layer 2 backstop — surface a limbo session after N ms of silence (0 = off). */
-  limboTimeoutMs: number;
 }
 
 /** A per-project recovery override — every field optional (absent ⇒ inherit). */
diff --git a/packages/web/src/test/factories.ts b/packages/web/src/test/factories.ts
index bf614260..f4868a19 100644
--- a/packages/web/src/test/factories.ts
+++ b/packages/web/src/test/factories.ts
@@ -27,7 +27,6 @@ export function makeModelsResponse(over: Partial<ModelsResponse> = {}): ModelsRe
       autoReDrive: false,
       debounceMs: 5000,
       maxRetries: 1,
-      limboTimeoutMs: 0,
     },
     attachmentsDefault: {
       enabled: true,
diff --git a/website/src/content/docs/architecture/overview.md b/website/src/content/docs/architecture/overview.md
index 1dd63082..0f7bdb3f 100644
--- a/website/src/content/docs/architecture/overview.md
+++ b/website/src/content/docs/architecture/overview.md
@@ -648,7 +648,7 @@ The main knobs:
 | **Agent capabilities** | `PADDOCK_BROWSER_MCP` (false — Playwright/headless Chromium, via the static agent config, not injection) |
 | **Sweeper** | `PADDOCK_SWEEP_MIN_INTERVAL_MS` (300000) |
 | **Curation budgets** | `PADDOCK_CURATION_OVERVIEW_MAX_TOKENS` (2000), `PADDOCK_CURATION_CHANGELOG_MAX_TOKENS` (8000), `PADDOCK_CURATION_CLAUDEMD_MAX_TOKENS` (6000) — `curation.*` in YAML, per-project overridable (`curation-config.ts`) |
-| **Chat recovery** | `PADDOCK_RECOVERY_SURFACE` (**true** — `surfaceKilledTask`, the `chat:killed_task` affordance), `PADDOCK_RECOVERY_AUTODRIVE` (false), `PADDOCK_RECOVERY_DEBOUNCE_MS` (5000), `PADDOCK_RECOVERY_MAX_RETRIES` (1), `PADDOCK_RECOVERY_LIMBO_MS` (0 = off) |
+| **Chat recovery** | `PADDOCK_RECOVERY_SURFACE` (**true** — `surfaceKilledTask`, the `chat:killed_task` affordance), `PADDOCK_RECOVERY_AUTODRIVE` (false), `PADDOCK_RECOVERY_DEBOUNCE_MS` (5000), `PADDOCK_RECOVERY_MAX_RETRIES` (1) |
 | **Attachments** | `PADDOCK_ATTACHMENTS_ENABLED` (true), `PADDOCK_ATTACHMENTS_MAX_FILE_SIZE_MB` (25), `PADDOCK_ATTACHMENTS_MAX_FILES_PER_MESSAGE` (10), `PADDOCK_ATTACHMENTS_ALLOWED_TYPES` (`*` — a hygiene guardrail, **not** a security boundary) |
 | **OpenAPI** | `PADDOCK_OPENAPI_ENABLED` (false), `PADDOCK_OPENAPI_PATH` (`/open-api`) — see [§12](#12-openapi-reference) |
 | **Management API** | **YAML-only** `managementApi.*` — `clients[]`, `instanceId`, `trustedProxies` — plus the `PADDOCK_MCP_TOKEN_<CLIENT>` credentials and `PADDOCK_MANAGEMENT_TRUSTED_PROXIES`. See [Management API (MCP)](/reference/mcp/). |
diff --git a/website/src/content/docs/configuration/chat-recovery.md b/website/src/content/docs/configuration/chat-recovery.md
index 33a4cc46..ca4324fc 100644
--- a/website/src/content/docs/configuration/chat-recovery.md
+++ b/website/src/content/docs/configuration/chat-recovery.md
@@ -187,7 +187,6 @@ Set these in the environment (or the YAML instance-config file under a top-level
 | `autoReDrive` | `PADDOCK_RECOVERY_AUTODRIVE` | `false` (OFF) | 3 | Automatically re-drive a hung chat (detect the killed task + inject the nudge on its own). |
 | `debounceMs` | `PADDOCK_RECOVERY_DEBOUNCE_MS` | `5000` | 3 | Quiet window (ms) after a killed task before auto re-drive fires, so a chat that's genuinely finishing isn't poked. |
 | `maxRetries` | `PADDOCK_RECOVERY_MAX_RETRIES` | `1` | 3 | Per-session cap on auto re-drives, so a wedged chat isn't poked in a loop. |
-| `limboTimeoutMs` | `PADDOCK_RECOVERY_LIMBO_MS` | `0` (off) | 2 | If set, surface a kept-alive session as stuck after this many ms of silence following a killed task. `0` disables it. *(Backstop timer ships in a follow-up.)* |
 
 Booleans accept `1`/`true`/`yes` (case-insensitive) for on and anything else for
 off. The numeric knobs accept non-negative integers; an invalid value falls back to
@@ -201,7 +200,6 @@ recovery:
   autoReDrive: false
   debounceMs: 5000
   maxRetries: 1
-  limboTimeoutMs: 0
 ```
 
 ### Per-project override
diff --git a/website/src/content/docs/configuration/environment.md b/website/src/content/docs/configuration/environment.md
index e99ad2cc..ca51ab91 100644
--- a/website/src/content/docs/configuration/environment.md
+++ b/website/src/content/docs/configuration/environment.md
@@ -263,7 +263,6 @@ a per-project `recovery` override in `project.yaml`.
 | `PADDOCK_RECOVERY_AUTODRIVE` | `false` (OFF) | no | **Layer 3.** Automatically re-drive a hung chat — Paddock detects the killed task and injects the nudge on its own (debounce + retry-cap guarded). Off by default (it acts unattended and costs a turn). |
 | `PADDOCK_RECOVERY_DEBOUNCE_MS` | `5000` | no | Layer 3: quiet window (ms) after a killed task before auto re-drive fires. Non-negative integer, else the default. |
 | `PADDOCK_RECOVERY_MAX_RETRIES` | `1` | no | Layer 3: per-session cap on auto re-drives (no poke-loops). Non-negative integer, else the default. |
-| `PADDOCK_RECOVERY_LIMBO_MS` | `0` (off) | no | Layer 2 backstop: surface a kept-alive session as stuck after this many ms of silence following a killed task. `0` disables it. *(Backstop timer ships in a follow-up — config only for now.)* |
 
 ## Attachments (inbound uploads)