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feat(compatibility): separate custom-tool grammar evidence from representation - #7282
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…sentation Record custom-tool representation and grammar as separate compatibility claims, and add a second exact subject where grammar is lost. - canonical Codex forward (gpt-5.6-sol): new request.custom_tools.grammar passthrough claim backed by a format assertion with a real Lark definition; manifest 1.4.0 - OpenGateway key auth (z-ai/glm-5.3-flash-ultrafast on the Responses wire, supportsResponsesCustomTools=false): custom tools translated to a string-input function, grammar degraded, custom_tool_call and custom_tool_call_output history translated - manifest test runs each fixture against the production adapter for its own subject, pins every subject's route, and adds a catalog evidence gate: cited assertion ids must exist in the owning fixture, and a passthrough claim may only cite equals assertions whose expected value is the caller's own input, so grammar loss cannot be labeled lossless No runtime behavior change; manifests stay passive. Refs #2358
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 27.27% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 4 files. (4 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: separating custom-tool grammar evidence from custom-tool representation in the compatibility manifest.
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Explanation
Docstring coverage is 27.27% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 4 files. (4 skipped: 4 unsupported.)
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Write docstrings for the functions missing them to satisfy the coverage threshold.
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A passthrough claim could cite any preserved caller value, so a grammar claim backed by an equals assertion on /body/model passed the gate while the grammar was dropped. Each passthrough-claimable feature now names the selectors that can prove it, grammar evidence must carry a non-empty definition, and unbound features cannot be claimed as passthrough. Refs #2358
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Actionable comments posted: 1
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Inline comments:
Review comments at @docs-site/src/content/docs/contributing.md:
- Around line 266-270: Update the compatibility-claim guidance in the ja, ko,
ru, and zh-cn localized sections to match the English requirements: allow
passthrough claims only when feature-bound equals assertions preserve the
caller’s own value at the same place, and keep custom-tool and grammar claims
separate when their behavior differs.
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📒 Files selected for processing: 8
docs-site/src/content/docs/contributing.mdsrc/compatibility/index.tssrc/compatibility/openai-responses.tssrc/compatibility/opengateway-responses.tsstructure/adapters/compatibility-contracts.mdtests/codex-integration/compatibility-manifest.test.tstests/fixtures/compatibility/openai-codex-forward-gpt56-sol-v1.jsontests/fixtures/compatibility/opengateway-key-glm53-responses-v1.json
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Maintainer integration into dev (MAINTAINERS.md exception, actor lidge-jun, admin). This is maintainer integration, not an independent review or self-approval. Exact head: 2b28939 (contains origin/dev 2a10a2b) Workflow runs at this head:
Decision record:
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Summary
The compatibility manifest could only say that a route keeps a custom tool; it could not say whether the tool's grammar survives. On the canonical Codex forward route both survive, but on a routed Responses destination that rejects native custom tools, OpenCodex lowers the tool to a string-input function and the grammar is dropped. This PR records that difference as evidence, per the implementation path in the #2358 maintainer comment.
openai/ gpt-5.6-sol): newrequest.custom_tools.grammarpassthrough claim, backed by an assertion on the fullformatincluding a real Larkdefinition. Manifest version 1.4.0.z-ai/glm-5.3-flash-ultrafaston the Responses wire (supportsResponsesCustomTools: false). Custom tools aretranslated(stringinputfunction), grammar isdegraded(format removed), andcustom_tool_call/custom_tool_call_outputhistory istranslatedtofunction_call/function_call_output. The fixture sends the same grammar as the forward fixture, so the route is the only difference.tests/codex-integration/compatibility-manifest.test.ts: each fixture runs against the production adapter for its own manifest subject; every subject's route is pinned (registry base URL, auth kind, per-model wire default); every cited assertion id must exist in the owning fixture; and apassthroughclaim may only citeequalsassertions, on a selector bound to that feature, whose expected value is the caller's own input at the same place (grammar evidence must include a non-empty definition). Grammar loss therefore cannot be labeled lossless.No runtime behavior changes. Manifests remain passive data and the import-graph guard still shows the request/startup path does not load them.
structure/adapters/compatibility-contracts.mdand the contributing guide (English plus the ja, ko, ru and zh-cn translations) describe the two validation layers and the new rule.This delivers only the evidence slice of the umbrella RFC;
ocx compatibility explain, other providers, and the OS-keychain work stay open.Refs #2358
Verification
bun test tests/codex-integration/compatibility-manifest.test.ts: 13 pass, 0 fail (110 expects).passthroughwithout a limitation failed the evidence gate with both coherence issues (... must be an equals assertion,... expects a value that differs from the caller input). Permanent negative tests cover absence-as-lossless, a rewritten value, evidence on an unrelated preserved field (/body/model) or/url, a grammar without a definition, a selector with no caller input, an unbound passthrough feature, a dangling assertion id, and a deleted assertion.9e116bd39aand2b2893987d, and both threads are resolved.9e116bd39a, then PASS on the interdiff.bun test tests/test-layout.test.ts tests/test-layout-tooling.test.ts tests/ci-workflows/file-size-ratchet.test.ts tests/codex-integration/compatibility-manifest.test.ts tests/lab/core-lab-boundary.test.ts tests/ci-workflows/structure-ssot.test.ts: 123 pass, 0 fail.bun run typecheck,bun run structure:check,bun run privacy:scan: exit 0.bun run test(pinned Bun 1.4.3, local macOS, 11 concurrent lanes on this machine): 48940 pass / 120 skip / 2 fail across 2447 files. Both failures reproduce identically or for the same environmental reason on an untouchedorigin/devtree exported withgit archiveto/private/tmp, and neither file is touched by or imports this diff:tests/claude-integration/claude-desktop-remote-hub.test.ts:249(native catalog label mismatch, same failure on dev) andtests/ci-workflows/bun-runtime.test.ts(test-home guard refuses removal because this worktree lives under the real~/.codex; on the dev export it fails on local PATH Bun provenance). Hosted CI is the authoritative full run.fixture-runtime-token); the caller'sauthorizationis asserted to be replaced and unrelated headers removed.Checklist
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