fix(responses): parse code-mode declarations in bounded linear time by luvs01 · Pull Request #732 · luvs01/opencodex

luvs01 · 2026-10-13T00:14:13Z

Summary

Code-mode declaration matching could repeatedly rescan descriptions containing many candidate Promise separators, and repeat the work for every pending heading.

Replace the backtracking declaration regex with bounded forward scans and index pending headings by name.
Skip quoted type text and line/block comments with escape awareness when counting delimiters, and require the return type's generics to close fully. Ordinary field comments containing apostrophes or brackets retain their evidence; unterminated opaque text is refused.
Oversized descriptions contribute no nested evidence, and oversized declaration bodies are not recognized. The contradiction scan still reads oversized descriptions.
Update the parsing contract in structure/subagents.md.

Verification

Current head: ce1fa40b2201e04364cc816ed71282c22520f78a.

Bun 1.4.3: bun test tests/codex-integration/code-mode-collab-surface.test.ts tests/codex-integration/deferred-collab-surface.test.ts — 93 passed, 0 failed.
bun run typecheck, bun run structure:check, and git diff --check passed on the committed patch.
Nine new public collabSurface cases cover quoted/comment text, unterminated regions, and a comment-heavy declaration below the existing size cap. The preceding head had been observed to lose V1 evidence for ordinary field comments containing an apostrophe or unmatched bracket.
Current-head hosted CI and its aggregate ci check passed on ce1fa40b.
A full local repository suite was not repeated across the active worktrees. Focused parser regressions and completed hosted CI provide the validation scope.
Existing review threads are resolved. Maintainer review remains a separate merge requirement.

Checklist

Focused regressions for the changed behavior are included.
Current-head CI passed.
Structure documentation is updated.
Quote, generic-closure, and comment-handling findings have regression coverage.
Reviewed by maintainer.

Generated with Devin

Summary by CodeRabbit

Bug Fixes
- Collaboration detection now recognizes complete tool declarations across single- and multi-line formats, including supported parameter types and non-empty promise return types.
- Oversized descriptions and declaration bodies no longer count as collaboration evidence, reducing false detections from malformed or excessively large input.
- Nested headings are matched more accurately when multiple headings share a tool name.

The code-mode collaboration detector introduced in lidge-jun#6977 validated each exec tool declaration fence with /^(?:args|input): \S[\s\S]*\): Promise< [^>\s][\s\S]*>; \};$/. Two overlapping unrestricted repetitions let a fence body full of "): Promise<a" separators force a quadratic rescan on rejection, and the owner lookup re-ran the match once per pending heading. An admitted POST /v1/responses caller supplies the exec description, so a sub-megabyte request could starve the shared event loop for seconds; effort-cap normalization invokes collabSurface() even when multi-agent guidance is disabled. completeDeclarationName() now checks fixed boundaries and scans forward once for the Promise separator, the owner lookup indexes pending headings by name, and nested-evidence parsing is bounded to 1 MiB descriptions and 64 KiB declaration bodies. The contradiction scan still reads oversized descriptions, so a large listing can only push a turn toward null. Regression tests drive ~393 KiB of repeated separators with and without 256 pending same-name headings through collabSurface(); each resolves in milliseconds where the previous matcher starved the loop for seconds. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

coderabbitai · 2026-10-13T00:14:23Z

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📝 Walkthrough

The collaboration-surface parser now recognizes complete tool declarations with bounded description and declaration sizes. It indexes pending headings by name and removes the owning heading and later pending headings when a declaration matches.

Changes: Collaboration-surface parsing

Layer / File(s)	Summary
Bounded declaration recognition `src/server/responses/code-mode-collab-surface.ts`, `structure/subagents.md`	The parser validates complete declarations with `args` or `input` parameters and a non-empty `Promise` return type. Descriptions over 1 MiB provide no nested evidence, and declaration bodies over 64 KiB are not recognized. The documentation describes these limits.
Indexed heading ownership `src/server/responses/code-mode-collab-surface.ts`, `tests/codex-integration/code-mode-collab-surface.test.ts`	Pending headings are indexed by normalized name. A matching declaration removes its owning heading and later pending headings. Regression tests cover malformed declaration bodies, repeated same-name headings, and oversized descriptions.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Bug fix

Suggested reviewers: lidge-jun

Merge Risk: 🟡 Moderate · up to b9574

A malformed tool description can be treated as V1 evidence and cause a direct V2 collaboration surface to be rejected. Fix declaration validation before merging.

Pre-merge checks · 5

Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage		Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 2 files. (1 skipped: 1 …
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 accurately summarizes the main change: bounded linear-time parsing for code-mode declarations in POST /v1/responses. It is concise and specific.

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github-actions · 2026-10-13T00:14:26Z

✅ Deterministic PR hygiene checks passed.

…-parse-20261012

Upstream refactored codeModeV1Evidence into analyzeCodeModeExec for the new deferred-collab-surface lane; the linear-time declaration parse now backs both callers. subagents.md grew to 599 lines upstream, so the new bound contract is compressed to keep the doc at the 600-line budget.

luvs01 · 2026-10-13T02:07:17Z

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coderabbitai · 2026-10-13T02:07:25Z

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Actionable comments posted: 1

🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @src/server/responses/code-mode-collab-surface.ts:
- Around line 108-110: Update completeDeclarationName to validate the entire
parameter and Promise return-type structure before returning a declaration name,
rejecting surplus text such as “; garbage” after the return type. Add the
provided malformed declaration as a regression test and verify
analyzeCodeModeExec does not report renderedV1 for it or misclassify the
collabSurface.

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Reviewing files that changed from the base of the PR and between 3bb7a56 and b957489.

📒 Files selected for processing (3)

src/server/responses/code-mode-collab-surface.ts
structure/subagents.md
tests/codex-integration/code-mode-collab-surface.test.ts

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…dered tool completeDeclarationName returned the tool name at the first "): Promise<" hit without checking the rest of the signature, so "Promise<unknown>; garbage" still counted as a rendered V1 declaration. The parameter list now ends only at the ')' that balances the opening paren, and the return type must hold generic depth positive to the stripped suffix — a '>' that reaches zero mid-tail is surplus text, while '=>' arrows and nested generics still parse. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

The bracket scan still counted delimiters inside quoted literals — a parameter type like { choice: ")" } made a valid declaration unreadable — and the return-type check never verified the depth it left behind, so a missing generic closer still credited the declaration. String and template literals are now skipped with escape awareness in both scans, and the return type must end at exactly the depth the stripped suffix owns: early zero is surplus, a leftover depth is incomplete. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Skip line and block comments outside quoted type text so ordinary rendered field descriptions cannot change bracket or generic depth. Reject unterminated opaque regions and exercise comment-heavy declarations below the existing size bound. Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

luvs01 · 2026-10-13T06:47:14Z

Closing duplicate tracking after preserving and independently validating the complete change in integration commit f9b02c5ef9f08a49f0377354b6089fa0ab6b36d7 based on development revision 6da2774369aa32552e318e333902499683d053bc. All three changed files match source HEAD ce1fa40b2201e04364cc816ed71282c22520f78a byte for byte. The pinned Bun 1.4.3 parser/deferred regression run passed 93 tests; type, structure, materialized-file privacy and diff checks passed. Integration remains unmerged and requires its own CI and maintainer review. The source branch is retained.

github-actions Bot added the bug Something isn't working label Oct 13, 2026

luvs01 added 2 commits October 13, 2026 09:26

Merge remote-tracking branch 'fork/dev' into devin/collab-decl-linear…

b6a9622

…-parse-20261012

luvs01 marked this pull request as ready for review October 13, 2026 00:52

coderabbitai Bot reviewed Oct 13, 2026

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Comment thread src/server/responses/code-mode-collab-surface.ts Outdated

luvs01 and others added 3 commits October 13, 2026 11:50

luvs01 marked this pull request as draft October 13, 2026 05:39

luvs01 marked this pull request as ready for review October 13, 2026 06:22

luvs01 closed this Oct 13, 2026

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fix(responses): parse code-mode declarations in bounded linear time - #732

fix(responses): parse code-mode declarations in bounded linear time#732
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