fix(openai): drop tool-schema patterns Python re cannot compile - #4096
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OpenAI-family upstreams validate a function tool's JSON Schema `pattern`
by compiling it with Python `re`, which has no Unicode property escapes.
A schema authored in JavaScript is therefore refused whole:
Invalid schema for function 'Artifact': '^(?!__.*__$)[^\p{Cc}...]$'
is not a 'regex'.
Claude Code 2.1.265 ships exactly such a pattern on the `field` parameter
of its built-in Artifact tool, and built-in tool definitions go out on
every request, so the whole GPT route fails for those clients whether or
not the tool is ever called.
`pattern` is advisory for the model and is not enforced on the arguments
a tool is called with, so drop only the patterns the destination cannot
compile. An escaped backslash before `p{` stays, since Python compiles
that fine, and a property literally named `pattern` is left as data.
Applied in normalizeFunctionToolSchema, the one tool-schema hook on the
Responses passthrough that runs outside the forward-provider guards, so
it covers the ChatGPT backend, generic openai-responses, Azure, and the
WS codex transport; and in the existing sanitizer slot of
toolsToChatFormat for the chat-completions serializer.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Included review availability: Your plan provides up to 10 included reviews per hour; 4 remain after this review. 📝 WalkthroughWalkthroughThe change adds shared removal of unsupported Unicode property escapes from function-tool schemas. Chat and Responses adapters apply the sanitizer before serialization or destination-specific normalization. Tests and guides document the filtering and preservation rules. ChangesUnicode property-pattern sanitization
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The sanitizer is integrated and covered across both adapter paths, with no actionable merge-blocking issue identified. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant ToolSchema
participant ChatOrResponsesAdapter
participant ToolRequest
ToolSchema->>ChatOrResponsesAdapter: function tool schema
ChatOrResponsesAdapter->>ToolSchema: stripUnicodePropertyPatterns
ToolSchema-->>ChatOrResponsesAdapter: sanitized schema
ChatOrResponsesAdapter->>ToolRequest: serialized compatible schema
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 5 files. (2 skipped: 2 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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리뷰 · 우선순위 74 / 80이 PR은 기여자 초안 고치는 방법은 Kiro가 Bedrock이 싫어하는 validation 키워드를 빼 주던 것과 같은 타협입니다. 목적지가 컴파일할 수 없는 탐지는 단순 문자열 검색이 아닙니다. types.ts/config.ts 분할 캠페인과는 무관하고, 스폰서 표면(#3914)과도 파일 겹침이 없습니다. 기여자 초안 라인 150-152 ( 메인테이너의 판단이 필요한 지점
너의 추천 이 댓글은 grok-bot이 작성했습니다 |
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Inline comments:
In `@src/adapters/responses-tool-schema.ts`:
- Line 159: Update the patternProperties handling in
stripUnicodePropertyPatterns so keys matching usesUnicodePropertyEscape are
excluded before being copied into the output, while preserving supported keys
and existing pattern-value filtering. Add a regression test covering a Unicode
property escape key such as ^\p{L}+$ and verify it is removed from the resulting
Responses tool schema.
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Inline comments:
In `@docs-site/src/content/docs/guides/claude-code.md`:
- Around line 553-559: Update both
docs-site/src/content/docs/guides/claude-code.md (lines 553-559) and
docs-site/src/content/docs/ko/guides/claude-code.md (lines 435-440) to
explicitly scope the normalization to the openai-chat and openai-responses
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Reviewed carried head 91d75da against merge base 8026405, using the PR comparison rather than a two-tip diff against the newer target. Approving the documented compatibility change.
Both serializers are wired: toolsToChatFormat normalizes the actual Chat parameters, and normalizeFunctionToolSchema covers Responses including forward-auth passthrough. The added buildRequest test catches removal of the Chat call site; the Responses wire test covers the reported Artifact shape. The walker distinguishes schema name bags and literal payloads, preserves required/sibling constraints, handles escaped backslash pairs, and avoids recursive call-stack growth. Existing encrypted-marker behavior retains the same key sets after their rename.
The tradeoff is real: matching pattern constraints are removed, not enforced elsewhere by OCX, and normalization is adapter-wide rather than a capability proof about every custom backend. The English/Korean guide makes that limitation explicit and tells tool implementations to validate inputs. This review does not imply support for every Python-incompatible regex or patternProperties key.
I verified repository CI at this carried SHA via run 34326656938, rather than relying only on the older source-head run cited in the description. The run's ci/gates and Linux/macOS shards succeeded; its Windows shard matrix and macos control were skipped. No local execution, broad security scan, workflow weakening or runtime config change was performed.
Attribution to the original contributor is present. Keep final integration on this carry; the original #4072 should be closed as superseded only after the carry actually lands. This approval does not merge or deploy the patch.
A patternProperties key is itself a regex the destination compiles, so the name-bag branch copied one verbatim and the request still failed. Drop the entry with its schema, and keep ordinary name bags copying keys as data.
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All three findings addressed at head b7666d5.
Frames now carry whether the bag is Documentation scope. Applied to both locales: the note names the Verification: repository CI on this exact head; local typecheck/tests NOT RUN (local execution restricted in this environment). |
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Re-reviewed the new delta after my earlier approval at 91d75da. The patternProperties extension needs an additional contract fix before that approval can cover this head.
In src/adapters/responses-tool-schema.ts, dropping an uncompilable patternProperties entry removes its entire property schema while retaining additionalProperties unchanged. For an object with patternProperties mapping Unicode-letter keys to string values and additionalProperties: false, removing the matcher leaves every such key forbidden. If minProperties is 1, the transformed schema cannot admit any object at all. This is different from merely dropping a string-value pattern constraint. A schema that was valid on an ECMA-compatible custom backend is affected too because both adapter paths apply the normalization unconditionally.
Please define a safe, explicit lowering policy for regex-keyed objects, or keep that case out of this patch and return an honest unsupported-schema error where necessary. Do not simply relax additionalProperties globally: retained matchers can have different value constraints. Add a full adapter-path regression with patternProperties + additionalProperties: false (+ minProperties: 1) and verify the intended argument contract, alongside the existing supported-key/literal-property controls. Update the wording that this preserves tool shape accordingly.
Exact-head CI 34339221775 passed, but the new tests only verify that matcher keys disappear; they do not cover this interaction. The original scalar pattern fix can remain focused without silently changing a dictionary tool into an empty-object-only tool.
…rrow the object Dropping a regex-keyed matcher moves its keys to additionalProperties. On a closed object that forbids or re-constrains them, and a dictionary tool whose only matcher was regex-keyed admits nothing once minProperties is 1. Such objects now pass through as written, so an ECMA-compatible destination keeps working and an incompatible one reports the regex instead of receiving an unsatisfiable schema.
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Addressed at 5e68c4e. The finding was right, and it was a real correctness bug rather than a wording problem. Dropping a regex-keyed matcher moves the keys it covered to The policy is now explicit in Regressions cover both adapter paths at the wire: a closed dictionary tool with @Ingwannu please re-check this head and withdraw or resubmit the review against it. |
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Rechecked 5e68c4e. The direct additionalProperties:false case and both adapter-path regressions now address that part of the finding. One composition case still violates the same invariant.
patternPropertyDropOnlyWidens checks only the node containing patternProperties. With a root object containing allOf: [{ patternProperties: { : { type: "string" } } }], unevaluatedProperties:false and minProperties:1, the inner schema has neither closing keyword, so its matcher is removed. The outer unevaluatedProperties closure then rejects the keys that the removed matcher previously evaluated. The original dictionary is usable on an ECMA-capable backend; the transformed one again admits no object.
Please add this same-instance allOf/outer-unevaluatedProperties case through both adapter seams and preserve its matcher/argument contract. The smallest safe scope is to leave regex-keyed patternProperties intact in this PR and keep the scalar pattern repair; a composition-aware lowering policy can be a separate change. A node-local openness test is not enough to support the current "only widens" claim. This is a static source-path finding; no live provider or account was used.
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Owner-directed immediate maintainer integration at exact head |
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Summary
Maintainer carry of #4072 so the fix can land: that pull request is a contributor draft with an open readiness checklist, and only its author can complete it. This branch carries the same commits unchanged.
OpenAI-family upstreams validate a function tool's JSON Schema
patternby compiling it with Python'sre, which cannot compile ECMA-262 Unicode property escapes. A client that ships one on a built-in tool loses every request, not just calls to that tool, because the schema is refused whole before routing:Claude Code 2.1.265 does exactly this on its
Artifacttool.stripUnicodePropertyPatternsdrops only the patterns the destination cannot compile, keeping the tool's shape while letting the request through — the same trade the Kiro adapter makes for validation keywords Bedrock rejects.Detection is escape-aware rather than a substring scan: in
\\p{2}the backslash pair is a literal and thep{2}is an ordinary quantifiedp, which Python compiles fine, so scanning for the raw text would discard a working pattern. Both\p{…}and\P{…}are dropped. The walk uses an explicit stack because schema depth is caller-influenced, and it distinguishes thepatternkeyword from a property someone happened to namepattern, including insideconst,default,enum, andexamplespayloads. It returns the input itself when nothing changed, so callers can use identity.Both request paths are wired:
toolsToChatFormatfor Chat Completions andnormalizeFunctionToolSchemafor Responses.The Claude Code guide (English and Korean) gains a short user-facing note under inbound translation, so the tradeoff is visible outside the code comment: which patterns are omitted, that sibling constraints and the required list survive, that an omitted pattern is neither preserved nor enforced upstream, and that a tool implementation should validate its own inputs. It is described as adapter-level compatibility normalization, not a claim about every custom OpenAI-compatible backend.
Verification
buildRequestand assertstools[0].function.parameters, so reverting the chat serializer normalization fails the suite. The direct-helper tests alone would not have caught that.bun run typecheck/bun run test: NOT RUN (local execution restricted in this environment). Repository CI on this branch's head is the gate.Checklist
Carried-from: #4072
Carried-from-commit: 6097c67
Co-authored-by: itismyfield itismyfield@users.noreply.github.com
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