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Stop repetitive reasoning streams before provider timeout - #1904
Detect sustained exact repetition in streamed reasoning and cancel the request.
Require explicit user confirmation before retrying the same request.
Forward OpenRouter abort signals to the OpenAI SDK so cancellation reaches the upstream inference request.
Scope and limitation
This mitigates the failure rather than fixing the model's reasoning. DeepSeek V4.1 Flash may still begin hallucinating on very large subtasks (observed beyond roughly 200k tokens), but Zoo Code now detects the repetitive reasoning, terminates the upstream request promptly, and avoids waiting roughly 1,500 seconds for the router timeout.
Regression coverage
Reproduces the reported DeepSeek-style reasoning loop across arbitrary chunk boundaries.
Verifies ordinary long reasoning and short repeated phrases are not flagged.
Verifies task cancellation without automatic retry.
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Summary
Summary by CodeRabbit
Bug Fixes
OpenRouter streaming requests now honor cancellation signals, allowing in-progress requests to be stopped.
Repetitive reasoning loops are detected and cancelled. You’re asked whether to retry rather than having the task retry automatically.
Confirmed retries now advance the retry-attempt count correctly, without duplicating the user’s message in retry history.
OpenRouter streaming requests now forward supplied abort signals. Task streams now detect repeated reasoning, cancel the current request when a loop is detected, and prompt the user to retry. Confirmed retries increment the retry-attempt count.
Streaming request options include the supplied abort signal. Tests check signal forwarding for Anthropic and OpenAI models and verify that the Anthropic beta header is limited to Anthropic models.
The detector checks bounded reasoning text for repeated patterns. Tests cover repeated cycles and distinct reasoning steps.
Cancel and prompt on detected loops src/core/task/Task.ts, src/core/task/__tests__/Task.spec.ts
Task checks reasoning chunks and cancels the request when it detects a loop. The retry path prompts the user for this error. Confirmed retries increment the attempt count. Tests cover cancellation, retry choices, and retry history.
sequenceDiagram
participant Task
participant ReasoningLoopDetector
participant Request
participant User
Task->>ReasoningLoopDetector: Add reasoning chunk
ReasoningLoopDetector-->>Task: Report repeated pattern
Task->>Request: Cancel current request
Task->>User: Prompt with RepetitiveReasoningError
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Merge Risk: Minimal · previous review 585c2
Repetitive reasoning streams are now cancelled as soon as a loop appears in the current chunk, and the user is asked before any retry. A confirmed retry no longer duplicates the request in the conversation history. OpenRouter cancellations now reach the upstream request. No outstanding risks remain that should block merging.
Security architecture risk: Low · up to 280b2
Cancellation improves containment of repetitive requests, but confirmed retries can duplicate conversation history. End-to-end interruption and confirmation enforcement are not fully established.
Retained concerns
Low · reliability · inferred: Confirmed retry after repetitive-reasoning cancellation requeues non-empty user content with retryAttempt zero while retaining the original user turn. The next attempt therefore appends that content again, violating recovery-history idempotency and changing the conversation supplied to subsequent requests. This extends a pre-existing output-token retry behavior to the newly introduced cancellation path; it does not establish unauthorized tool execution.
Security review details
Security Blast Radius
inferred — The demonstrated exposure is the active task's inference request and conversation history. Provider output can trigger cancellation and retry handling, but the inspected changes do not add a route to another tenant, credential store, or privileged service. The supplied dependency evidence does not establish broader exposure.
Security Findings and Attack Paths
inferred — Repeated provider reasoning followed by an accepted retry can cause duplicate user history through the newly reachable recovery branch. The source supports a conversation-integrity defect, not a verified privilege-escalation or tool-replay attack.
Trust Boundaries and Controls
observed — Task owns the abort controller and passes its signal through request metadata; OpenRouter now forwards that signal into SDK options. Tool selection remains on the existing metadata path, and the existing stream consumer interrupts after a completed tool-use result. These controls are counterevidence to an asserted new tool-authority expansion.
Resilience and Maintainability Implications
observed — Error handling saves partial UI state and clears streaming/controller state in finally. The cancellation regression uses a mocked declined prompt, and the provider regression verifies signal forwarding into a mocked SDK call. Neither establishes real approval-policy behavior or live upstream termination.
Hardening Proposals
proposed — Make confirmed recovery preserve the original history turn, evaluate repetition before another blocking read, and validate confirmation policy and provider termination through the real cancellation path. These are containment and recovery improvements, not additional verified security findings.
Pre-merge checks: 7 · 1
Failed checks: 1 warning
Check name
Status
Explanation
Resolution
Description check
The description explains the implementation, scope, regression coverage, and verification results. It does not follow the required template because it omits the Related GitHub Issue section, the Pre-S…
Add the required template sections. Provide an approved issue reference in the form "Closes: #123", complete the Pre-Submission Checklist, state the documentation impact, and include any required additional notes or contact details. Keep th…
Passed checks: 7 passed
Check name
Status
Explanation
Title check
The title clearly and concisely describes the primary change: stopping repetitive reasoning streams before the provider timeout.
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.
Regression Evidence
Focused coverage exists for each changed behavior. openrouter.spec.ts covers Anthropic and non-Anthropic models with an abort signal, asserts signal forwarding, and asserts that non-Anthropic reques…
Security Boundaries
The changed paths do not introduce a concrete security-boundary failure. ReasoningLoopDetector only compares streamed reasoning text and throws a fixed RepetitiveReasoningError; it does not execut…
Persistence Integrity
No changed persistence path meets the failure condition. The PR changes in-memory stream detection, cancellation, OpenRouter request options, and retry metadata. On the new repetitive-reasoning path, …
Lifecycle Resource Cleanup
No concrete changed lifecycle leak or duplicate-work path is present. Repetitive detection cancels the active controller before the next iterator read, OpenRouter now receives that signal, and the cat…
Full details: Regression Evidence
Explanation
Focused coverage exists for each changed behavior. openrouter.spec.ts covers Anthropic and non-Anthropic models with an abort signal, asserts signal forwarding, and asserts that non-Anthropic requests omit the Anthropic header. ReasoningLoopDetector.spec.ts covers detection across chunk boundaries and rejection of ordinary long reasoning with repeated short phrases. Task.spec.ts covers cancellation before a stalled read, both retry decisions, the retry count, and preservation of one user message. No durable UI change requires a Playwright snapshot. Prior failure addressed: openrouter.spec.ts:301-325 now tests openai/gpt-4o with metadata.abortSignal, asserts the exact signal, and expects no Anthropic header.
Full details: Security Boundaries
Explanation
The changed paths do not introduce a concrete security-boundary failure. ReasoningLoopDetector only compares streamed reasoning text and throws a fixed RepetitiveReasoningError; it does not execute or persist model text. Task calls cancelCurrentRequest() and still requires ask("api_req_failed", ...) before retrying, while the retry counter is incremented. openrouter.ts forwards the existing metadata.abortSignal to the SDK and conditionally adds the existing Anthropic header; this does not expose secrets or bypass an allowlist or approval control.
Full details: Persistence Integrity
Explanation
No changed persistence path meets the failure condition. The PR changes in-memory stream detection, cancellation, OpenRouter request options, and retry metadata. On the new repetitive-reasoning path, abortStream awaits saveClineMessages() before retry or user handling. The retry uses an incremented in-memory retryAttempt and avoids adding a duplicate user message; no new persistence write, non-atomic write, missing await, or unpropagated persisted default is introduced.
Full details: Lifecycle Resource Cleanup
Explanation
No concrete changed lifecycle leak or duplicate-work path is present. Repetitive detection cancels the active controller before the next iterator read, OpenRouter now receives that signal, and the catch path closes the async generator while finally clears streaming state. The detector keeps a bounded 12,288-character buffer. The retry path requires user confirmation and increments the retry count, so it does not automatically duplicate requests.
Full details: Description check
Explanation
The description explains the implementation, scope, regression coverage, and verification results. It does not follow the required template because it omits the Related GitHub Issue section, the Pre-Submission Checklist, Documentation Updates, and other required template sections.
Resolution
Add the required template sections. Provide an approved issue reference in the form "Closes: #123", complete the Pre-Submission Checklist, state the documentation impact, and include any required additional notes or contact details. Keep the existing implementation summary and verification steps under the matching Description and Test Procedure sections.
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Reviewing files that changed from the base of the PR and between 280b240 and 585c211.
📒 Files selected for processing: 4
src/api/providers/__tests__/openrouter.spec.ts
src/api/providers/openrouter.ts
src/core/task/Task.ts
src/core/task/__tests__/Task.spec.ts
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📜 Recent review details
🧰 Additional context used
📓 Path-based instructions: 6Check persistence and lifecycle invariants: awaited atomic writes, rollback or explicit partial-failure behavior, cross-window state consistency, stale listeners/watchers, cancellation, idempotency, and safe restart/resume without lost or d...
CodeRabbit configuration file
Files:
src/core/task/__tests__/Task.spec.ts
src/core/task/Task.ts
Treat model, provider, MCP, path, command, and tool data as untrusted.
CodeRabbit configuration file
Files:
src/api/providers/openrouter.ts
src/api/providers/__tests__/openrouter.spec.ts
Require regression coverage at the lowest valid harness with behavior-focused assertions, including relevant negative, error, false/unset, and boundary cases.
CodeRabbit configuration file
Files:
src/api/providers/__tests__/openrouter.spec.ts
src/core/task/__tests__/Task.spec.ts
Check strict typing and exhaustive behavior across normal, boundary, error, cancellation, retry, and compatibility paths.
CodeRabbit configuration file
Files:
src/api/providers/openrouter.ts
src/api/providers/__tests__/openrouter.spec.ts
src/core/task/__tests__/Task.spec.ts
src/core/task/Task.ts
Verify extension/webview contracts, cancellation and error propagation, VS Code lifecycle correctness, and behavior under retries and partial failure.
[warning] 343-343: Mutation test advisory
src/api/providers/openrouter.ts:343: 3 mutation test gaps; example: Survived ConditionalExpression mutant (replacement: true). See the job summary for the complete list and resolution guidance.
src/core/task/Task.ts
[warning] 4201-4201: Mutation test advisory
src/core/task/Task.ts:4201: 3 mutation test gaps; example: Survived LogicalOperator mutant (replacement: chunk?.type === "reasoning" || reasoningLoopDetector.add(chunk.text)). See the job summary for the complete list and resolution guidance.
🔇 Additional comments: 4
src/api/providers/openrouter.ts: 1
342-350: LGTM!
src/api/providers/__tests__/openrouter.spec.ts: 1
301-326: LGTM!
src/core/task/Task.ts: 1
4163-4163: LGTM!
Also applies to: 4200-4204, 4678-4682, 4694-4694
src/core/task/__tests__/Task.spec.ts: 1
616-616: 🩺 Stability & Availability
The proposed test hang is refuted. Task.spec.ts mocks p-wait-for to resolve immediately, so the retry path does not remain blocked on userMessageContentReady. No change to these presenter mocks is required.
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Actionable comments posted: 3
🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/core/task/__tests__/Task.spec.ts:
- Around line 606-609: Update the test around `recursivelyMakeClineRequests` so
the provider stream pauses on its next read after yielding a repetitive
reasoning chunk. Assert cancellation while that read is still pending, then
release it and await task completion; do not rely on `cancelSpy` being called
only after the task call completes.
Review comments at @src/core/task/Task.ts:
- Line 3730: Update the confirmed-retry handling for RepetitiveReasoningError in
Task.ts to increment retryAttempt when requeuing currentUserContent instead of
resetting it to 0. Preserve the existing retry limit behavior and add a test
covering a confirmed retry of a non-empty request to ensure its history is not
duplicated.
- Line 3317: Update the stream-processing flow around reasoningLoopDetector.add
so each current reasoning chunk is checked for a loop before awaiting the next
stream item; when detected, call cancelCurrentRequest() without waiting for
another chunk. Preserve the existing handling for chunks that do not trigger the
detector.
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📜 Review details🧰 Additional context used📓 Path-based instructions (6)Check persistence and lifecycle invariants: awaited atomic writes, rollback or explicit partial-failure behavior, cross-window state consistency, stale listeners/watchers, cancellation, idempotency, and safe restart/resume without lost or d...
Treat model, provider, MCP, path, command, and tool data as untrusted.
⚙️ CodeRabbit configuration file
Files:
src/api/providers/__tests__/openrouter.spec.ts
src/api/providers/openrouter.ts
Require regression coverage at the lowest valid harness with behavior-focused assertions, including relevant negative, error, false/unset, and boundary cases.
[warning] 337-337: Mutation test advisory
src/api/providers/openrouter.ts:337: Survived StringLiteral mutant (replacement: ""). See the job summary for the complete list and resolution guidance.
[warning] 335-335: Mutation test advisory
src/api/providers/openrouter.ts:335: 3 mutation test gaps; example: NoCoverage OptionalChaining mutant (replacement: metadata.abortSignal). See the job summary for the complete list and resolution guidance.
src/core/task/ReasoningLoopDetector.ts
[warning] 21-21: Mutation test advisory
src/core/task/ReasoningLoopDetector.ts:21: Survived BooleanLiteral mutant (replacement: true). See the job summary for the complete list and resolution guidance.
[warning] 20-20: Mutation test advisory
src/core/task/ReasoningLoopDetector.ts:20: 2 mutation test gaps; example: Survived ConditionalExpression mutant (replacement: false). See the job summary for the complete list and resolution guidance.
[warning] 17-17: Mutation test advisory
src/core/task/ReasoningLoopDetector.ts:17: Survived MethodExpression mutant (replacement: this.buffer + text). See the job summary for the complete list and resolution guidance.
[warning] 14-14: Mutation test advisory
src/core/task/ReasoningLoopDetector.ts:14: NoCoverage BooleanLiteral mutant (replacement: true). See the job summary for the complete list and resolution guidance.
[warning] 13-13: Mutation test advisory
src/core/task/ReasoningLoopDetector.ts:13: Survived ConditionalExpression mutant (replacement: false). See the job summary for the complete list and resolution guidance.
[warning] 9-9: Mutation test advisory
src/core/task/ReasoningLoopDetector.ts:9: Survived StringLiteral mutant (replacement: "Stryker was here!"). See the job summary for the complete list and resolution guidance.
[warning] 5-5: Mutation test advisory
src/core/task/ReasoningLoopDetector.ts:5: 2 mutation test gaps; example: Survived ArithmeticOperator mutant (replacement: MAX_PATTERN_LENGTH / (REQUIRED_REPETITIONS + 1)). See the job summary for the complete list and resolution guidance.
Assert the exact request signal and model-specific beta headers for both Anthropic and OpenAI models.
Amp-Thread-ID: T-01a10cc3-9ccd-740a-917e-e09003b7f29a
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Add or strengthen a focused test that fails under the mutation. If the mutant is equivalent, request maintainer approval for the narrowest mutator-specific exclusion and explain why it cannot change behavior:
// Stryker disable next-line ConditionalExpression: normalized input cannot reach the alternate branch
const result = condition ? value : fallback
Broad all exclusions and exclusions without a concrete reason are reported as advisories.
Reproduce locally
From a full checkout containing both commits:
pnpm install --frozen-lockfile
node scripts/stryker-diff.mjs ci --base a15ba8c8ace93a5bba85da6d6883963e85f7614e --head daf0076ef1ac63134950f86ae5fcac6e37eb29c6
The workflow uploads generated reports in the changed-code-mutation-report artifact. A direct artifact link appears below after upload.
Advisory findings
src/core/task/Task.ts:4375: mutation exclusions must use "// Stryker disable next-line MutatorName: concrete reason"; broad or unreasoned exclusions are not allowed.
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Summary
Scope and limitation
This mitigates the failure rather than fixing the model's reasoning. DeepSeek V4.1 Flash may still begin hallucinating on very large subtasks (observed beyond roughly 200k tokens), but Zoo Code now detects the repetitive reasoning, terminates the upstream request promptly, and avoids waiting roughly 1,500 seconds for the router timeout.
Regression coverage
Verification
pnpm --dir src exec vitest run core/task/__tests__/ReasoningLoopDetector.spec.ts core/task/__tests__/Task.spec.ts api/providers/__tests__/openrouter.spec.ts— 185 tests passed.pnpm lint— 11 packages passed (pre-commit hook).pnpm check-types— 11 packages passed (pre-push hook).