fix(responses): alias tool names over 64 chars for Meta Muse wire compatibility - #4422
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…ility (#4410) Meta Muse rejects function names over 64 characters. On api.meta.ai only, rewrite long or charset-unsafe tool identities to collision-safe wire names and restore the originals inbound before namespace restore and the undeclared-tool guard.
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Included review availability: Your plan provides up to 10 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughMeta Muse Responses requests now alias tool names that exceed the 64-character upstream limit or use unsupported characters. The adapter records reverse mappings, and the Responses pipeline restores original names across streamed, non-streamed, inspected, cached, and continuation payloads. ChangesMeta Muse tool-name aliasing
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Client
participant ResponsesPassthrough
participant OpenAIResponsesAdapter
participant MetaAIResponses
Client->>ResponsesPassthrough: Send tools and tool_choice
ResponsesPassthrough->>OpenAIResponsesAdapter: Build routed request
OpenAIResponsesAdapter->>OpenAIResponsesAdapter: Create Muse aliases
OpenAIResponsesAdapter->>MetaAIResponses: Send <=64-character wire names
MetaAIResponses-->>ResponsesPassthrough: Return tool calls and events
ResponsesPassthrough->>ResponsesPassthrough: Restore original names
ResponsesPassthrough-->>Client: Return original tool names
Merge Risk: ⚪ Minimal · up to The Meta Muse aliasing change includes host-scoped request rewriting, response restoration, continuation handling, and regression coverage without an identified merge-blocking risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 24.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 29 functions across 6 files. (3 skipped: 3 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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리뷰 · 우선순위 72 / 80이 PR은 Meta Muse( 현재 구현 중심은 새 파일 어댑터 쪽은 테스트는 helper 단위( 전체적으로 #4410 재현에 맞춘 범위가 분명하고, Kiro openai-responses.ts (Muse rewrite 훅) - 호스트 게이트를 stripMuseSpark 조건과 분리한 선택은 맞다. Zen/Go로 새어 나가지 않는다. 메인테이너의 판단이 필요한 지점
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| const { wireByOriginal, aliases } = buildMuseToolNameAliasPlan(collectMuseToolNames(body)); | ||
| if (aliases.size === 0) return { body, aliases }; |
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When a Meta request declares a long tool but sets tool_choice: "none" or an allowed_tools list that excludes it, this plan still adds the tool's wire alias to the inbound restoration map. If a buggy or untrusted upstream emits that alias anyway, restoreMuseToolNames converts it back to the executable client-facing name before the undeclared-tool guard runs; that guard authorizes against the declared catalog rather than tool_choice, so it does not reject the call. Filter the returned aliases according to the current selector, as the namespace/custom compatibility layers already do, so an explicitly disabled tool cannot be restored into an executable call.
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Inline comments:
In `@structure/providers/chat-compat.md`:
- Around line 41-43: Update structure/providers/chat-compat.md lines 41-43 to
document aliases for unsupported characters as well as overlength function tool
names, and include additional_tools among the rewrite locations. Update
structure/transports/inventory.md line 11 to state that both overlength and
unsupported-character function tool names receive collision-safe aliases.
In `@structure/transports/responses.md`:
- Around line 330-333: Update the Direct Meta Muse / Meta Model response
documentation to state that aliasing also applies to tool names containing
characters outside [a-zA-Z0-9_-], including names that are 64 characters or
shorter. Keep the existing documentation about aliases for names exceeding 64
characters and the api.meta.ai scope unchanged.
In `@tests/responses/responses-muse-tool-name-alias.test.ts`:
- Line 324: Make the continuation-cache test deterministic around
rememberPassthroughResponseChecked: replace the fixed Bun.sleep delay with a
completion signal or test seam that waits for rememberResponseState to finish,
capture the second outbound request body, and assert it includes the cached
first-turn function_call and its result so the test verifies replayed history
rather than merely the aliased wire response.
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devlog/_plan/260912_muse_tool_name_alias/000_plan.mdscripts/test-layout/layout.jsonsrc/adapters/base.tssrc/adapters/openai-responses.tssrc/responses/muse-tool-name-alias.tssrc/server/responses/core.tsstructure/adapters/registry.mdstructure/data-planes/inbound-compat.mdstructure/providers/chat-compat.mdstructure/providers/kiro.mdstructure/runtime.mdstructure/transports/inventory.mdstructure/transports/responses.mdtests/fixtures/test-layout-expected.jsontests/providers/muse-tool-name-alias.test.tstests/responses/responses-muse-tool-name-alias.test.ts
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Match kiro-style sanitize fallbacks, rebuild the shared 55-char prefix pair, and drive handleResponses restore through a key-auth fixture pointed at api.meta.ai so registry oauth no longer 401s the inbound cases.
…ents (#4410) The undeclared-tool guard reads name straight off response.function_call_arguments.done, outside any function_call item, so a hashed Meta Muse alias reached the client and could fail the turn as an undeclared tool. Restore now matches that event and its delta alongside the item shapes.
…n test (#4410) Meta Muse aliases names with unsupported characters as well as overlength names. Record additional_tools among rewrite locations, poll the passthrough continuation cache instead of a fixed sleep, and assert replayed history on the second outbound body.
…undary (#4410) Upstream sees every aliased declaration even when tool_choice narrows what it may call, so a wire name in that catalog is not evidence that restoring it into an executable client name is permitted. Narrow the restorable map the same way authorizedAliases already does for the namespace layer.
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Summary
Meta Muse (
https://api.meta.ai/v1) rejects any request whose function toolnameis longer than 64characters with
HTTP 400and the messagename must be at most 64 characters, got 66. Clientsthat send fully-namespaced MCP catalogs hit this constantly: a real ZCode turn carried 93 tools
with 20 names over the limit (
mcp__plugin_huggingface-skills_huggingface-skills__hub_repo_searchis 66 chars), and the whole turn died before any tool could be called. Disabling plugins worked
around it by losing the tools.
On the
api.meta.aihost only, long or charset-unsafe tool identities are now rewritten tocollision-safe wire names that fit the limit, and the original names are restored on the way back
so the client never sees the aliases. Before, a 66-char name failed the turn with 400. After, the
same catalog goes out as
mcp__plugin_huggingface-skills_huggingface-skills__hub__dec57ce4(64)and the tool call returns to the client under its original name.
The alias is deterministic: a sanitized 55-character prefix plus an 8-hex SHA-256 of the original
name, so the same tool maps to the same wire name on every turn and history round-trips cleanly.
Names are claimed in two phases, where conforming names occupy the collision domain first and long
names alias around them, and a salt loop resolves any residual collision.
Scope is deliberately narrow. The gate is the destination hostname, which covers every Muse model
including the default
muse-spark-1.3, and deliberately does not reuse the existing contributormodel and URL predicates from
stripMuseSparkUnsupportedWebSearchFields, because those also matchOpenCode Zen and Go. No other provider path changes behavior, and arguments, user text, and schema
property names are never rewritten.
Outbound rewriting covers
tools[], historyfunction_callandcustom_tool_callnames,tool_choice(includingallowed_tools),additional_tools, and chat-shapedtool.function.name.Inbound restore runs at every site where a call name reaches the client: streaming payload
rewrites, the non-stream JSON path, the continuation cache, and the inspection check. It always
runs before namespace restore and before the undeclared-tool guard, since on a continuation turn
only the client's original names are in the declared catalog.
Closes #4410.
Verification
tests/responses/responses-muse-tool-name-alias.test.tscovers the helper: 64-char names passthrough verbatim, 65/66-char names alias deterministically, charset sanitization, the
shared-55-char-prefix collision case, an alias colliding with a real short tool, and the
two-phase claim.
tests/providers/muse-tool-name-alias.test.tscovers the adapter againsthttps://api.meta.ai/v1: the issue's 93-tool catalog leaves with only names of 64 chars orfewer, history and
tool_choiceare aliased consistently, and a non-Meta provider keeps everyname verbatim.
structure/owners updated for the touched areas, with the alias contract recorded instructure/transports/responses.md; both new test files registered inscripts/test-layout/layout.jsonandtests/fixtures/test-layout-expected.json.structure:checkwere NOT RUN: the maintainer explicitlyrequired skipping local checks for this change. Repository CI on this exact head is the
verification of record.
Checklist
Summary by CodeRabbit
Bug Fixes
api.meta.ainow support function tool names exceeding 64 characters or containing unsupported characters.Documentation
Tests