fix(inference): make prompt caching actually reach the wire (native Anthropic, OpenRouter breakpoints, cache identities)

[senamakel]

Summary

• Prompt caching was declared but never reached the wire. The host sets RunPolicy::cache.protect_prompt_prefix = true and PromptCacheSegmentMiddleware declares the system prompt + tool catalogue as the cacheable prefix on every request — but tinyagents' apply_prompt_cache_breakpoints and every provider adapter read request.cache_policy alone, which the loop never set. Result: no prompt_cache_key routing hint and no cache_control marker was ever emitted, while the layout guard reported the prefix as protected. Fixed upstream in tinyagents#148 (stamps the effective policy onto the outgoing request) and tinyinference#10.
• BYOK Anthropic paid full price on every turn. auth_style = "anthropic" slugs were served by the crate OpenAiModel against Anthropic's OpenAI-compatibility endpoint, which documents prompt caching as unsupported and reports prompt_tokens_details as always empty. They now build the crate's native Messages API adapter (inference::provider::crate_anthropic), which places breakpoints on the last tool, the last system block and the final message — so a growing tool loop reuses iteration n's cache at n+1, not just the system prompt. Text mode (native_tools = false) keeps the compat client, since prompt-guided tools only exist there.
• OpenRouter slugs (any openrouter.ai endpoint) now emit explicit cache_control on the last system and last user message, which is what OpenRouter forwards to Anthropic/Gemini; other Chat Completions endpoints are untouched (hosted OpenAI rejects unknown part fields).
• Every host ChatModel wrapper dropped cache_identity. RouteRecordingModel, ProfileOverrideModel, MaxTokensModel, StatelessModel and DefaultTemperatureChatModel all fell to the trait default (None), so the harness response cache keyed every model under one "anonymous-model" marker — a shared cache could serve a local model's answer to a hosted one. All five forward it now, and the managed backend / Claude Code / Claude Agent SDK providers identify themselves.
• DeepSeek's native prompt_cache_hit_tokens is now read into cache_read_tokens (crate change), so relays that pass its usage object verbatim stop reporting 0% hits.
• Includes fix(core): repair main build after stale-branch merges #6229 (main build repair), which this branch needs to compile.

Problem

Users with a BYOK Claude key, or routed through OpenRouter, got zero prompt-cache hits regardless of how carefully the prefix was kept byte-stable (which gitbooks/developing/architecture/agent-harness.md already documents at length). The stable prefix existed; nothing told the provider to cache it. Confirmed by reading both adapters and by a harness-level test in tinyagents that drives a real AgentHarness with the run-policy flag and records the request the model receives — no key, no policy, before the fix.

Solution

• Route Anthropic-auth slugs to AnthropicModel (new crate_anthropic.rs, 59 lines: the builder plus the @<temp> override). Egress disclosure and the session/local-only gates run exactly as before, in the same order.
• CrateOpenAiConfig::explicit_cache_control, keyed on endpoint_is_openrouter (host match, not substring) so a self-hosted proxy is never marked.
• Forward cache_identity through the wrapper stack; give the three bespoke providers identities that name binary/endpoint + model and never a credential.
• Pin vendor/tinyagents to its prompt-cache-fix branch (which pins vendor/tinyinference likewise). Merge order: tinyinference#10 → tinyagents#148 → this. The gitlinks already point at commits on the upstream repos, so no re-pin is needed after those merge unless they are squash-merged there (they should not be).

Submission Checklist

• Tests added or updated — factory routing to the native adapter (+ the text-mode negative case), cache_identity forwarding across the stacked wrappers, endpoint_is_openrouter positive/negative cases, the native builder's profile/identity. Upstream: 26 Anthropic adapter tests (breakpoint placement, tools, streaming, failure paths), 6 OpenAI-side, and the harness run-policy test in both directions.
• Diff coverage ≥ 80% — every new host function has a direct test; the log::debug! lines are the only untested statements.
• Coverage matrix updated — N/A: no feature row added or renamed; the inference provider rows already cover BYOK routing.
• All affected feature IDs listed — N/A.
• No new external network dependencies introduced — all tests use synthetic bodies and byte streams.
• Manual smoke checklist updated — N/A (no release-cut surface change; a BYOK Anthropic smoke would be worthwhile before the next release, see Impact).
• Linked issue — N/A.

Impact

• Desktop, BYOK Anthropic users: turns now go over the Messages API (/v1/messages) instead of /v1/chat/completions. Same key, same endpoint base. Streaming, tool calls, images and signed thinking replay are all implemented in the adapter; temperature is clamped into Anthropic's 0..=1. Worth one manual smoke on a real key before release.
• Cost: on Anthropic, cache writes are 1.25× on the newly-written delta and reads 0.1×, so any conversation longer than one turn is cheaper. On OpenRouter → Claude the same applies. Managed backend: unchanged bytes except a new top-level prompt_cache_key field beside thread_id; the backend can use it for shard routing but ignores it today.
• Observability: every model call logs [cache] effective cache policy applied to the outgoing request with prompt_cache_key_injected and cacheable_segments; cache_read_tokens on the returned usage is the proof.
• No config, migration or wire-contract change on the RPC surface.

Related

• Closes: N/A
• Follow-up PR(s)/TODOs: Make declared prompt-cache prefixes reach the wire (native Anthropic adapter, OpenRouter breakpoints, DeepSeek hits) tinyinference#10, Stamp the effective cache policy onto outgoing requests so prefix protection reaches the wire tinyagents#148 (must merge first); fix(core): repair main build after stale-branch merges #6229 (main build repair, already merged into this branch). The managed backend should honour prompt_cache_key as its shard key and forward cache_control when it relays to Anthropic — backend repo, not this one.

---

AI Authored PR Metadata (required for Codex/Linear PRs)

Linear Issue

• Key: N/A
• URL: N/A

Commit & Branch

• Branch: prompt-cache-fix
• Commit SHA: e996c1f37a93dbd5a2f90c745c54f1f564639cd9

Validation Run

• pnpm --filter openhuman-app format:check: N/A (no frontend change)
• pnpm typecheck: N/A
• Focused tests: RUST_MIN_STACK=67108864 GGML_NATIVE=OFF cargo test --lib --features "$(bash scripts/ci/product-features.sh)" -- inference::provider agent::tinyagents::model → 326 passed, 0 failed
• Rust fmt/check: cargo fmt --check clean; cargo clippy -p openhuman --features "$(bash scripts/ci/product-features.sh)" -- -D warnings clean; contributor-set clippy clean
• Tauri fmt/check: N/A (shell untouched; it links the same core)

Validation Blocked

• command: a live Anthropic round trip
• error: no ANTHROPIC_API_KEY in this environment; the OpenRouter key on this box is over its daily budget and restricted to non-Anthropic providers
• impact: the native adapter is verified against synthetic Messages API bodies and SSE streams only; recommend one manual BYOK smoke before release

Behavior Changes

• Intended behavior change: Anthropic-auth slugs use the Messages API; OpenRouter requests carry cache_control; all requests carry prompt_cache_key when a cacheable prefix is declared; wrappers expose the inner model's cache identity.
• User-visible effect: cached-token counts > 0 on Claude/OpenRouter; lower spend on multi-turn threads. No UI change.

Parity Contract

• Legacy behavior preserved: yes for every non-Anthropic, non-OpenRouter slug (byte-identical request bodies apart from the added prompt_cache_key); managed backend unchanged apart from that field.
• Guard/fallback/dispatch parity checks: access gates (enforce_local_only_inference, verify_session_active) and egress disclosure run before construction on the new path exactly as on the old one; anthropic_auth_cloud_slug_in_text_mode_keeps_the_compat_client pins the fallback.

Duplicate / Superseded PR Handling

• Duplicate PR(s): none found
• Canonical PR: this
• Resolution (closed/superseded/updated): N/A

Summary by CodeRabbit

• New Features

  • Added prompt caching support for Anthropic and OpenRouter integrations, including stable prompt-prefix caching.
  • Anthropic requests with native tool support now use the native Messages API, while text-mode requests retain compatibility behavior.
  • Response caching now distinguishes models, endpoints, profiles, and request-level model overrides.

• Documentation

  • Expanded architecture documentation describing prompt-cache behavior and provider requirements.

• Bug Fixes

  • Prevented cached responses from being incorrectly shared across different models or configurations.
  • Updated positional tool-call formatting for more reliable argument parsing.

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📝 Walkthrough

Walkthrough

The change scopes response caches by effective model identity, adds native Anthropic and OpenRouter prompt-cache routing, updates dispatcher and p-format contracts, verifies registration readiness idempotence, and advances the vendored tinyagents revision.

Changes

Cache identity and provider prompt caching

Layer / File(s)	Summary
Propagate effective model identities src/openhuman/agent/tinyagents/..., src/openhuman/inference/provider/...	Wrappers and providers now expose stable cache identities. Tests cover forwarding, model selection, and credential exclusion.
Route provider prompt caching src/openhuman/inference/provider/..., gitbooks/developing/architecture/agent-harness.md, vendor/tinyagents	Native Anthropic routing is used for native tools. OpenRouter enables explicit cache markers. Documentation describes the effective prompt-cache policy and routing key.

Tool and registration contract updates

Layer / File(s)	Summary
Set tool result and formatting contracts src/openhuman/agent/dispatcher.rs, src/openhuman/agent/*pformat*, src/openhuman/agent/prompts/...	Dispatcher-created tool results set trusted_verbatim to false. Formatted results now require one transcript entry, and p-format arguments use positional indices.
Verify registration readiness idempotence src/core/jsonrpc_tests.rs	The JSON-RPC test verifies that readiness returns true once and false on the next call.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~30 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant AgentHarness
  participant CloudModelFactory
  participant ProviderAdapter
  participant ProviderEndpoint
  AgentHarness->>CloudModelFactory: resolve model and effective cache policy
  CloudModelFactory->>ProviderAdapter: select Anthropic or OpenRouter configuration
  ProviderAdapter->>ProviderEndpoint: send request with cache markers and routing metadata

Loading

Suggested reviewers: graycyrus

Merge Risk: 🟡 Moderate · up to 24627

Configured HTTP Anthropic endpoints will now fail requests when native tools are enabled. Require HTTPS for native routing before merge.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 48.78% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 82 functions across 26 files. (1 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main changes: making prompt caching reach provider requests through native Anthropic support, OpenRouter breakpoints, and cache identities.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 48.78% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 82 functions across 26 files. (1 skipped: 1 unsupported.)

• Fix all pre-merge checks with AI

---

_{A rabbit checks the cache by moonlit light
Each model keeps its identity right
Anthropic marks the prefix in flight
Tools carry trust flags out of sight
Indexed calls hop neatly through the night
Readiness rests after its first rite}

_{Comment @coderabbitai help to get the list of available commands.}

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tinysweeper found nothing blocking. Approving.

$0.0000 · 0 in / 0 out

[tinysweeper]

How this change flows

6 changed behaviours across 13 relationships. 6 surrounding behaviours are shown (60 graph nodes walked). 32 further behaviours left out to keep the diagram readable.

flowchart LR
  n0["dispatch_format_results<br/>changed"]:::changed
  n1["to_outcomes<br/>changed"]:::changed
  n2["pformat_dispatcher_handles_multiple_tags<br/>changed"]:::changed
  n3["pformat_dispatcher_parses_tool_call_tag<br/>changed"]:::changed
  n4["...l_parses_positionally_through_the_adapter<br/>changed"]:::changed
  n5["...tion_pformat_renders_signature_not_schema<br/>changed"]:::changed
  n6["vec"]:::impacted
  n7["build_crate_openai_model"]:::impacted
  n8["CrateOpenAiConfig"]:::impacted
  n9["openhuman"]:::impacted
  n10["make_crate_local_runtime_chat_model"]:::impacted
  n11["build_session_agent_inner"]:::impacted
  n0 -->|calls| n1
  n2 -->|calls| n6
  n2 -->|tests| n6
  n3 -->|calls| n6
  n3 -->|tests| n6
  n4 -->|calls| n6
  n4 -->|tests| n6
  n5 -->|calls| n6
  n5 -->|tests| n6
  n7 -->|uses| n8
  n10 -->|calls| n7
  n10 -->|uses| n8
  n11 -->|uses| n9
  classDef changed fill:#0d4429,stroke:#238636,color:#e6edf3
  classDef impacted fill:#161b22,stroke:#6e7681,color:#c9d1d9
  classDef flagged fill:#5a1e02,stroke:#d93f0b,color:#ffffff
  classDef blocking fill:#67060c,stroke:#f85149,color:#ffffff

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_{Green: changed behaviour. Grey: surrounding behaviour. Arrows name the call, use, implementation, or test relationship. Orange: has findings. Red: has a finding that blocks the merge.}

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Inline comments:
In `@src/openhuman/agent/tinyagents/model.rs`:
- Around line 503-505: Update ProfileOverrideModel::cache_identity and
ClaudeAgentSdkProvider::cache_identity to include the effective selected model,
matching the model used during invocation rather than only the inner or default
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src/openhuman/inference/provider/claude_agent_sdk/subprocess.rs lines 259-264.

In `@src/openhuman/inference/provider/crate_openai.rs`:
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• gitbooks/developing/architecture/agent-harness.md
• src/core/jsonrpc.rs
• src/core/jsonrpc_tests.rs
• src/openhuman/agent/agent_tests_part_03_tests.rs
• src/openhuman/agent/tinyagents/host/model_resolver.rs
• src/openhuman/agent/tinyagents/mod_part_01.rs
• src/openhuman/agent/tinyagents/model.rs
• src/openhuman/agent/tinyagents/model_route_recording_tests_tests.rs
• src/openhuman/inference/provider/claude_agent_sdk/subprocess.rs
• src/openhuman/inference/provider/claude_code/mod.rs
• src/openhuman/inference/provider/crate_anthropic.rs
• src/openhuman/inference/provider/crate_anthropic_tests.rs
• src/openhuman/inference/provider/crate_openai.rs
• src/openhuman/inference/provider/crate_openai_tests.rs
• src/openhuman/inference/provider/factory_part_02.rs
• src/openhuman/inference/provider/factory_part_04.rs
• src/openhuman/inference/provider/factory_tests_part_02_tests.rs
• src/openhuman/inference/provider/mod.rs
• src/openhuman/inference/provider/openhuman_backend_model.rs
• vendor/tinyagents

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In `@src/openhuman/inference/provider/crate_anthropic.rs`:
- Around line 43-89: The Anthropic adapter currently reapplies
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In `@src/openhuman/inference/provider/factory_part_04.rs`:
- Around line 402-404: Update the native tool-calling condition around
endpoint_is_anthropic_messages to require an HTTPS endpoint before selecting the
native Anthropic route. Preserve non-HTTPS Anthropic endpoints on the
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• src/openhuman/agent/dispatcher_tests.rs
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• src/openhuman/agent/prompts/mod_tests_part_01_tests.rs
• src/openhuman/agent/tinyagents/model_g1_usage_tests_tests.rs
• src/openhuman/inference/provider/crate_anthropic.rs
• src/openhuman/inference/provider/crate_anthropic_tests.rs
• src/openhuman/inference/provider/factory_part_04.rs
• vendor/tinyagents

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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win

Keep non-HTTPS Anthropic endpoints on the compatibility client. endpoint_is_anthropic_messages matches http://api.anthropic.com by host only, but AnthropicModel rejects HTTP during invocation unless with_insecure_http(true) is enabled. This early return therefore makes the configuration fail instead of reaching CompatAuthStyle::Anthropic. Require HTTPS before selecting the native route.

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In `@src/openhuman/inference/provider/factory_part_04.rs` around lines 402 - 404,
Update the native tool-calling condition around endpoint_is_anthropic_messages
to require an HTTPS endpoint before selecting the native Anthropic route.
Preserve non-HTTPS Anthropic endpoints on the compatibility client using
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