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fix(tools): teach nested apply_patch delimiters in code mode - #2368

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ArcSolver:fix/code-mode-nested-apply-patch-delimiters
Aug 22, 2026
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fix(tools): teach nested apply_patch delimiters in code mode#2368
lidge-jun merged 3 commits into
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ArcSolver:fix/code-mode-nested-apply-patch-delimiters

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@ArcSolver ArcSolver commented Aug 22, 2026

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Summary

  • Nested tools.apply_patch(input) in Codex code mode is host-executed from exec JavaScript. A decorated *** Begin Patch *** envelope is rejected by Codex with The first line of the patch must be '*** Begin Patch' before any file is touched.
  • OpenCodex does not rewrite that nested helper body. PR fix(responses): repair apply_patch envelopes #2310 correctly leaves exec JavaScript byte-identical and only repairs top-level apply_patch custom-tool payloads.
  • This change teaches the exact delimiter in the shared non-OpenAI code-mode catalog nudge and the Cursor code-mode guidance. It does not invent an exec-body rewriter.
  • The follow-up test commits pin provider FIFO pacing to the injected clock and assert request identity, so the macOS suite no longer depends on wall-clock slack.

Closes #2367

Verification

  • bun test tests/tool-catalog-nudge.test.ts tests/cursor-tool-definitions.test.ts tests/request-pacing.test.ts: 57 passed, 0 failed.
  • Live Codex Desktop / OpenCodex 2.29.0 reproduction: nested tools.apply_patch("*** Begin Patch ***\n*** End Patch ***\n") failed the first-line verifier; the same helper with *** Begin Patch succeeded the first-line check.

Checklist

  • Scope stays focused and avoids unrelated cleanup.
  • Docs or release notes were updated when needed.
  • Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

Review readiness checklist

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  • All CI tests are green on my local testing.

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  • I resolved all correct Codex and CodeRabbit findings.

  • My PR is ready for review.

Summary by CodeRabbit

  • New Features

    • Improved code-mode guidance for nested patch applications, including exact required patch markers.
    • Clarified that malformed patch envelopes are rejected before file changes.
    • Confirmed JavaScript executed through exec is not rewritten.
  • Tests

    • Expanded coverage for patch formatting and nested patch execution.
    • Improved request-pacing tests with deterministic timing and FIFO interval validation.

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Deterministic PR hygiene checks passed.

@github-actions github-actions Bot added bug Something isn't working review-ready labels Aug 22, 2026
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✅ READY

  • all PR quality gates passed; the review readiness checklist is complete.

Review readiness checklist

  • ✅ All CI tests are green on my local testing.
  • ✅ I pushed my PR to the latest dev commit.
  • ✅ I resolved all correct Codex and CodeRabbit findings.
  • ✅ My PR is ready for review.

4/4 boxes ticked.

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The review-ready label marks this PR as ready; review automation runs independently.
Maintainers: @lidge-jun @Ingwannu

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github-actions Bot marked this pull request as ready for review August 22, 2026 09:13
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  • tests/request-pacing.test.ts

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📝 Walkthrough

Walkthrough

Code-mode guidance now documents exact nested tools.apply_patch delimiters. Tests verify the guidance and use a fake clock for deterministic concurrent request-pacing checks.

Changes

Nested apply_patch guidance

Layer / File(s) Summary
Exact nested patch envelope guidance
src/adapters/cursor/tool-definitions.ts, src/adapters/tool-catalog-nudge.ts
Guidance requires exact *** Begin Patch and *** End Patch delimiters without trailing ***. It identifies nested tools.apply_patch as host-executed.
Guidance assertion updates
tests/cursor-tool-definitions.test.ts, tests/tool-catalog-nudge.test.ts
Tests verify delimiter formatting, host execution, rejection of decorated envelopes, and unchanged JavaScript inside exec.

Deterministic request pacing

Layer / File(s) Summary
FIFO pacing validation
tests/request-pacing.test.ts
The concurrent pacing test uses an injected fake clock and verifies request starts at 0, 100, and 200 ms.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to c2ea1

The change is narrowly scoped to correcting nested apply_patch delimiter guidance and stabilizing related tests; no actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: ingwannu

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name Status Explanation Resolution
Out of Scope Changes check ⚠️ Warning The changes to tests/request-pacing.test.ts are unrelated to issue #2367 and modify request-pacing behavior outside the stated scope. Move the request-pacing test changes to a separate pull request, or link an issue that explicitly requires those timing-test updates.
Docstring Coverage ⚠️ Warning Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 5 files. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (3 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly and concisely describes the main change: documenting exact delimiters for nested apply_patch calls in code mode.
Linked Issues check ✅ Passed The guidance updates in both source files match issue #2367 and preserve exec JavaScript without adding an exec-body rewriter.
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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents
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Inline comments:
In `@tests/cursor-tool-definitions.test.ts`:
- Around line 486-488: Update the guidance assertions in
tests/cursor-tool-definitions.test.ts lines 486-488 and
tests/tool-catalog-nudge.test.ts lines 74-77 to verify both exact patch
delimiters by adding an assertion that note contains the `*** End Patch` marker
alongside the existing `*** Begin Patch` assertion.
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📒 Files selected for processing (4)
  • src/adapters/cursor/tool-definitions.ts
  • src/adapters/tool-catalog-nudge.ts
  • tests/cursor-tool-definitions.test.ts
  • tests/tool-catalog-nudge.test.ts

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Comment thread tests/cursor-tool-definitions.test.ts
@lidge-jun

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리뷰 · 우선순위 54 / 80

설명: 이 PR은 이슈 #2367 이 말한, Codex 코드 모드 안의 중첩 tools.apply_patch(input) 가 첫 줄을 *** Begin Patch *** 로 쓰면 Codex 가 파일을 건드리지 않고 거절하는 일을 고친다. 지금 CURRENT dev HEAD 는 5921c20df 이다. 이번 시간에 origin/dev 가 ced9a85 에서 여기로 옮겼다. 착지한 코드는 #2309 / #2339 / #2335 / #2313 이고 #2369 는 문서만이다. package.json 은 2.27.0 이다. 지금 HEAD 에는 src/responses/apply-patch-envelope.ts 가 없다. 열린 #2310 이 위쪽 apply_patch 봉투만 고치고 exec 자바스크립트는 바이트 그대로 둔다. 중첩 헬퍼는 Codex 가 exec 안에서 실행하므로 #2310 수리가 닿지 않는다. 이 이슈가 그 구멍을 가리킨다. 이 변경은 프롬프트만 고친다. src/adapters/tool-catalog-nudge.ts 의 넌-OpenAI 코드모드 넛지와 src/adapters/cursor/tool-definitions.ts 의 Cursor 코드모드 안내에 첫 줄은 정확히 *** Begin Patch, 끝 줄은 *** End Patch, 그 줄 끝에 *** 를 붙이지 말라는 문장을 더한다. exec 본문 재작성기는 만들지 않았다. 이슈가 시킨 범위와 맞다. 다만 예전 테스트는 코드모드 넛지에 apply_patch 글자가 없기를 잠갔다. 위쪽 도구로 착각하지 말라는 뜻이었다. 이 PR은 그 잠금을 풀고 이름을 넣는다. 모델이 위쪽 apply_patch 를 부르면 #1700 가드와 이번 시간 #2370 빈 목록 가드가 막을 수 있다. 그래도 프롬프트에 이름을 넣는 값은 남아 있다. 프롬프트만으로는 Grok 이 장식을 그만둔다는 보장이 없다. 라이브 재현은 장식은 실패, 정확한 첫 줄은 통과였다. 체크리스트 4칸이 채워져 있고 드래프트가 아니다. merge 상태는 BLOCKED 다. 카탈로그 팁은 Ox Alpha x-preview-f-free + deepseek-v4-flash-vision-exp. Cursor #2334 미연결, #2332 H2 discovery 전용. #2320 overflow + #2342 는 이미 dev. 사용자 길이 호환이고 고친 파일이 안내 문장뿐이라서 54.

src/adapters/tool-catalog-nudge.ts 코드모드 문장 - 중첩 apply_patch 첫 줄 규칙을 넣는다. exec 본문은 안 고친다
src/adapters/cursor/tool-definitions.ts buildCursorToolGuidanceSystemNote - Cursor 코드모드에도 같은 문장을 넣는다
tests/tool-catalog-nudge.test.ts apply_patch 금지 잠금 삭제 - 예전에는 글자 자체를 금했다. 위쪽 도구 오인을 막으려던 잠금이다
tests/cursor-tool-definitions.test.ts - Begin Patch / no trailing / exec 재작성 없음 문장을 잠근다
PR 본문 Closes #2367 - 안내만으로 라이브 Grok 이 장식을 그만두는지는 이 디프가 증명하지 않는다

메인테이너의 판단이 필요한 지점

너의 추천
머지 후보다. exec 를 다시 쓰지 않은 것이 맞다. #2367 은 머지 뒤 라이브에서 장식 첫 줄이 줄었는지 한 번 보고 닫는다. 지금 닫지 않아도 된다. #2310, #2370 과 한 장에 묶지 말 것. types.ts/config.ts 스플릿과 무관하다. 리베이스하지 말고 이 브랜치를 쓴다. 라벨은 그대로 둔다. 프리뷰 배포가 아니다. 체크리스트는 채워져 있으니 CI만 보면 된다.

이 댓글은 grok-bot이 작성했습니다

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.

Inline comments:
In `@tests/request-pacing.test.ts`:
- Around line 90-92: Update the request-pacing test around fetchImpl and the
starts assertions to record each request’s unique identity alongside its
timestamp. Use distinct request URLs or headers for the three requests, then
assert both FIFO request order and the expected timestamps so a LIFO queue
cannot pass.
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Comment thread tests/request-pacing.test.ts Outdated
Nested tools.apply_patch is host-executed from exec JavaScript, so a
decorated *** Begin Patch *** envelope is rejected by Codex before any
file is touched. Teach the exact delimiter in the shared code-mode nudge
and Cursor guidance instead of rewriting exec bodies.
The macOS suite failed the wall-clock FIFO assertion at 63ms instead of 85ms. Use the existing fake pacing clock so queued starts advance at the 100ms interval without depending on runner timing.
Record each queued URL with its paced timestamp so a LIFO queue cannot pass the 0/100/200 spacing check.
@ArcSolver
ArcSolver force-pushed the fix/code-mode-nested-apply-patch-delimiters branch from 3a3b7eb to c2ea192 Compare August 22, 2026 09:59
@ArcSolver
ArcSolver marked this pull request as ready for review August 22, 2026 10:00
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github-actions Bot marked this pull request as draft August 22, 2026 10:00
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github-actions Bot marked this pull request as ready for review August 22, 2026 10:02
@ArcSolver

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CI 블로커는 nested apply_patch 가 아니라 macOS tests/request-pacing.test.ts 의 wall-clock FIFO 간격이었습니다. 같은 파일의 다른 테스트는 이미 fake clock 을 쓰는데, 이 케이스만 Date.now()>= 85ms 를 봐서 러너에서 63ms 로 실패했습니다.

고친 내용:

  • FIFO 간격을 injected clock 으로 고정 (0 / 100 / 200)
  • 요청 URL 정체성까지 같이 assert 해서 LIFO 가 통과하지 못하게 함
  • latest dev (ae05672e) 위로 rebase

로컬: bun test tests/request-pacing.test.ts tests/cursor-tool-definitions.test.ts tests/tool-catalog-nudge.test.ts → 57 pass / 0 fail.

지금 HEAD c2ea1929 의 Cross-platform CI / React Doctor 는 포크 PR 워크플로 승인 대기입니다. 메인테이너가 Actions 에서 Approve and run 해주시면 그 스위트가 다시 돕니다.

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The scoped delimiter-guidance change is useful, and the exact head c2ea1929fa391d5b3032a1988b5847762283acc6 passes the focused suite locally: 57/57 across request-pacing, cursor-tool-definitions, and tool-catalog-nudge. I am still requesting changes before integration for two repository-quality reasons.

  1. The branch is now 11 commits behind current dev (d179fa4f2d327b65628baba6a5fafae8da1998fd; merge base ae05672e3a844b8ed32ef5899a4b302d99ffba07). Please rebase and rerun the exact-head cross-platform suite so the approval applies to the code we would actually merge.
  2. tests/request-pacing.test.ts is a valid deterministic test repair, but it is unrelated to #2367 and the two adapter guidance strings. Please split that pacing-only stabilization into its own focused PR (or explicitly link a pacing issue) so this PR remains a reviewable behavior slice and does not mix an independent queue-test change with the tool-guidance fix.

For the #2367 slice itself, preserve the current narrow boundary: guidance/tests only, no exec-body rewriting and no top-level apply_patch synthesis. After the rebase/split, rerun bun test tests/cursor-tool-definitions.test.ts tests/tool-catalog-nudge.test.ts, bun run typecheck, and the required exact-head CI. This remains a good merge candidate once those integration blockers are cleared.

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Re-review: the delimiter slice is right, two open blockers remain

Good news on the overlap question — this is not redundant with #2310, which merged into dev earlier today. #2310 repairs only a complete top-level apply_patch custom-tool envelope and leaves exec JavaScript byte-identical, so a nested tools.apply_patch(...) call never reaches that repair. Your guidance fills a genuine gap, and there is zero file overlap: git merge-tree against current dev is conflict-free.

The CodeRabbit threads are closed at this head, and I confirmed the two delimiter assertions are load-bearing — reverting the two source strings fails exactly them.

Both of Ingwannu's blockers are still open, and one got worse:

1. Stale head. git rev-list --left-right --count origin/dev...c2ea1929 is now 35 3 — you were cited at 11 behind, it is now 35, and #2310 is not an ancestor of your head. The review-ready checklist claims "latest dev commit". Rebase and re-run focused tests plus exact-head CI on the new SHA.

2. tests/request-pacing.test.ts is still in the diff. Two of three commits and 23 of 34 additions are pacing-only, in a PR whose production change is two guidance strings. An independent queue-test repair should not land or break with a prompt-only fix.

On Closes #2367

The tests prove the sentence is injected, not that routed Grok stops emitting *** Begin Patch ***. Worth dropping the closing keyword until a live code-mode turn shows the decorated first line is gone — and note GitHub will not auto-close from a dev merge anyway, so the issue needs closing by hand once that is observed.

One wording nit

"end with *** End Patch" is slightly stricter than the live verifier: a trailing newline after the delimiter is accepted by Codex and by #2310's envelope regex. "last line exactly *** End Patch (no trailing ***)" matches reality. Guidance-only, so low stakes.

Rebase and split, and this is straightforward to land.

bonelag pushed a commit to bonelag/megaproxy that referenced this pull request Aug 22, 2026
Four candidates reviewed at their current heads, all four held back, and a
final count that is honest about a backlog which never stopped moving.

lidge-jun#2083 was the strongest remaining candidate - approved, mergeable, and with
security work that revert-testing confirmed is load-bearing. Its own test file
cannot parse: the mock exports only callXaiImages while fulfill.ts now also
imports resolveXaiAspectRatioLiteral, so the runner dies before any assertion
and the new aspect_ratio regression never executes.

lidge-jun#2366 persists nothing. addRequestLog wrote all five new fields as null and the
function request-history projects through returned them null, while the first
commit says closes lidge-jun#1217.

lidge-jun#2368 is confirmed complementary to the merged lidge-jun#2310 rather than redundant, but
sits 35 commits behind with an unrelated pacing test still bundled. lidge-jun#2033 is 615
behind with its file changed underneath it.

The open count went 45 to 45. That is the useful number: ten PRs merged and
eight closed while roughly as many arrived, three of them after this phase's own
inventory was taken. A backlog with active contributors is a flow, not a queue
that drains, so the measure is whether each item carries a recorded disposition
rather than whether the count fell.

Records the recurring defect class across six held PRs: the code does something
the description denies, and the tests pass either way. None was visible from the
diff; each needed the same move, which is to revert the hunk and watch what does
not go red.
@lidge-jun
lidge-jun merged commit 03d5767 into lidge-jun:dev Aug 22, 2026
15 of 16 checks passed
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