fix(claude): stabilize Responses instructions for Muse/Go prompt cache - #4052
fix(claude): stabilize Responses instructions for Muse/Go prompt cache#4052Warexpor wants to merge 4 commits into
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Strip growing <total_tokens> and TaskCreate footers from Claude Code system text before it becomes Responses instructions, and reattach the latest notice as a trailing input message so Muse/Go prefix cache can hit. Paper and measured rates live under docs/claude-instructions-cache-stabilize/. Co-authored-by: Warexpor <warexpor@gmail.com>
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drafts: true📝 WalkthroughWalkthroughThe change stabilizes Claude Code system instructions before Anthropic-to-Responses translation. It removes dynamic token footers and TaskCreate notices, preserves the latest notice as trailing user input, adds integration tests, updates test-layout mappings, and documents measured cache results. ChangesClaude instruction cache stabilization
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The change improves prompt-cache stability, but it can alter legitimate system instructions and still misses cache affinity for requests without a user ID. These issues should be resolved before merge. Sequence Diagram(s)sequenceDiagram
participant ClaudeCode
participant anthropicToResponsesTranslation
participant stabilizeClaudeInstructionsForPromptCache
participant ResponsesRequest
ClaudeCode->>anthropicToResponsesTranslation: Anthropic system and user messages
anthropicToResponsesTranslation->>stabilizeClaudeInstructionsForPromptCache: joined system instructions
stabilizeClaudeInstructionsForPromptCache-->>anthropicToResponsesTranslation: stable instructions and latest dynamicNotice
anthropicToResponsesTranslation->>ResponsesRequest: cleaned instructions
anthropicToResponsesTranslation->>ResponsesRequest: trailing user input_text notice
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation 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 3 functions across 3 files. (3 skipped: 3 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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리뷰 · 우선순위 70 / 80이 PR은 Claude Code가 OpenCodex를 거쳐 Muse/Go(Responses)로 갈 때, 매 턴마다 커지는 시스템 푸터가 캐시를 깨는 구멍을 막는 수정입니다. 지금 체크아웃 기준으로 동작은 이렇게 이어집니다. 지금 HEAD의 같은 함수 바로 아래(약 363–395행)에는 이미 라인 9-13 / TOTAL_TOKENS_RE - 메인테이너의 판단이 필요한 지점
너의 추천 이 댓글은 grok-bot이 작성했습니다 |
The Claude Code path still uses metadata.user_id. Desktop has no session id, so the fallback key now fingerprints the cacheable prefix instead of raw systemParts that still contain <total_tokens> / TaskCreate footers. Co-authored-by: Warexpor <warexpor@gmail.com>
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Inline comments:
In `@src/claude/inbound-cache-stabilize.ts`:
- Line 9: Restrict the transformations in TOTAL_TOKENS_RE and
TASKCREATE_NUDGE_RE to verified canonical Claude Code footer lines and the exact
nudge paragraph, rather than matching arbitrary substrings in system content.
Preserve literal total_tokens tags and text surrounding near-match nudges, and
add regression coverage for both cases.
In `@src/claude/inbound.ts`:
- Around line 354-355: Store the stabilized system text produced by
stabilizeClaudeInstructionsForPromptCache once in the inbound request flow, use
it for both body.instructions and the metadata-less fallback cache-key hash, and
add a regression test covering different total_tokens footers without
metadata.user_id that verifies the prompt cache key remains unchanged.
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docs/claude-instructions-cache-stabilize/README.mdscripts/test-layout/layout.jsonsrc/claude/inbound-cache-stabilize.tssrc/claude/inbound.tstests/claude-integration/claude-inbound-cache-stabilize.test.tstests/fixtures/test-layout-expected.json
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Restrict strip to standalone integer <total_tokens> footer lines and the exact Claude Code reminder paragraph so inline docs of those tags or TaskCreate stay in instructions. Co-authored-by: Warexpor <warexpor@gmail.com>
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Hey @lidge-jun @Ingwannu — gentle ping when you have a minute. This is the Claude Code → Responses Fork CI on the latest pushes is stuck on Approve and run workflows ( |
Bring docs/claude-instructions-cache-stabilize/ onto the fork alongside the Desktop key + canonical-notice follow-ups cherry-picked from lidge-jun#4052.
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Reviewed f58fa1a. The Desktop cache-key correction is present, but the tighter regex still does not distinguish a harness notice from ordinary system content.
In src/claude/inbound-cache-stabilize.ts: TOTAL_TOKENS_RE matches any standalone numeric tag anywhere in instructions, including a literal example inside a fenced code block. translateAnthropicRequest invokes it unconditionally for every translated system prompt. A system instruction documenting a literal <total_tokens>123</total_tokens> line therefore loses that line from its example and gains a new trailing user message, even when no harness footer was appended. The current inline-documentation test cannot catch this because it only covers a tag embedded in a sentence. Also, the unconditional newline collapse and trim change no-match inputs.
Please preserve non-harness system text byte-for-byte, including fenced standalone examples and no-footer whitespace, and constrain relocation to a positively identified supported harness/footer shape. Add translator-level regressions for those legitimate no-op inputs alongside the existing real-footer/cache-key controls. If the input protocol supplies no trustworthy way to distinguish the two, keep this transformation explicitly opt-in instead of changing all Anthropic-to-Responses callers.
On the CI question: the waiting runs I can see are upstream repository runs 34262915228 (Cross-platform CI) and 34262915336 (React Doctor), not a permission I hold in your fork. I have not approved execution of this old head while requesting changes to the patch. Once the revised head is published, its exact diff and workflow context need review before approving that head's runs. #3719 stays separate and open.
Identify Claude Code <total_tokens> / TaskCreate notices as a trailing suffix outside markdown fences. No match returns the original system text byte-for-byte so fenced examples and whitespace-only prompts stay untouched. Translator regressions cover those no-ops. Co-authored-by: Warexpor <warexpor@gmail.com>
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@Ingwannu addressed on Relocation is now only a trailing, unfenced, canonical harness suffix ( Verification: |
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The no-match whitespace and closed-fence regressions are improvements, but one concrete no-op case remains broken at 098dc1d6b7892e49b01c04cff3761fb055e89873.
fencedRanges deliberately discards an unclosed opener. A legitimate system prompt ending with an open fenced example followed by a standalone numeric total_tokens tag is therefore treated as an unfenced harness suffix: the example is removed from instructions and appended as a new user turn. An unfinished fenced example is still code content through end-of-input, not positive proof of a harness footer. The existing test always closes its fence before EOF and cannot detect this case. Preserve unmatched opener-to-EOF ranges (and require a valid standalone closing fence), with translator-level no-relocation tests; a real footer after a correctly closed block must still work.
The broader distinction from my previous review also remains: a matching textual suffix is not caller provenance. If the supported input contract cannot positively distinguish an ordinary system example from a harness footer, make relocation explicitly opt-in rather than changing every Anthropic-to-Responses caller. No live cache measurement or product tests were run for this source review; #3719 remains separate.
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Summary
instructions. Growing<total_tokens>/ TaskCreate footers churn that prefix and collapse Muse/Go prompt-cache hit rates.instructionsand reattaches the latest notice as a trailinginputmessage (src/claude/inbound-cache-stabilize.ts, wired frominbound.ts).prompt_cache_keyfallback (nometadata.user_id) now hashes stabilized instructions so key routing tracks the cacheable prefix (f027fba). Claude Code still uses the session key frommetadata.user_id.docs/claude-instructions-cache-stabilize/PAPER_OCXFIX.pdf.SOCKS5 / Go session-header work is intentionally out of scope. Related Anthropic thinking-replay issue #3719 stays open (link only).
Verification
bun test tests/claude-integration/claude-inbound-cache-stabilize.test.ts— 7 pass (initial)bun testinbound-cache-stabilize + inbound — 53 pass;bun run typecheck— passtest:changed4933 pass / 1 skip; privacy scan passChecklist
docs/claude-instructions-cache-stabilize/)Review readiness checklist
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