[easonLiangWorldedtech]

Adds abort-signal support to the Poe provider for both completePrompt and createMessage (round 1 of the abort-signal series).

Supersedes #1301 (split C of 3). #1301's combined gateway-a diff generated 518 mutation-diff preflight mutants, over the 400 cap. This PR carries the Poe portion only: +533/−77 across 2 files, 80 preflight mutants (well under the 400 cap; measured against main @ 0dbd5846f).

completePrompt

• Accepts CompletePromptOptions (abortSignal and/or timeoutMs); the two are combined through the shared mergeAbortSignalAndTimeout (timeoutMs <= 0 disables the timeout; no manual cleanup needed — AbortSignal.timeout / AbortSignal.any handle the lifecycle).
• If the caller's signal aborts (or the per-request timeout fires) while the request is in flight, the provider rejects with a DOM-standard AbortError (error.name === "AbortError") instead of a generic completion error.
• If the request resolves after the abort, the late result is discarded and AbortError is thrown instead.
• Reasoning parameter handling is preserved on the abort paths: the reasoning-effort path (incl. modelMaxTokens — a falsy value sets no maxOutputTokens) and the reasoning-budget path behave identically with and without abort options.

createMessage (new bridging)

Bridges the caller's metadata.abortSignal into a per-request AbortController (Bedrock pattern):

• The request-local controller is captured by closure (not a mutable field), so concurrent requests do not interfere.
• Pre-aborted guard: if the signal is already aborted, the stream rejects with AbortError immediately without calling the API.
• The external listener is stored in a named const and removed in finally, so listeners never outlive the request.
• The AI SDK request is driven by the controller's signal, and abort-driven stream failures are normalized to AbortError.

Tests

• completePrompt: signal/timeout pass-through via mergeAbortSignalAndTimeout, timeoutMs <= 0 / no-options backward compatibility, pre-aborted reject, mid-flight abort reject, late-result discard, reasoning-effort/budget parameter preservation on abort.
• createMessage bridging: pre-aborted signal rejects with name === "AbortError" (no API call, no model fetch); mid-flight abort aborts the in-flight request and rejects the stream with name === "AbortError"; external listener removed after settlement; exact abort-error message asserted (The Poe request was aborted).

Part of the abort-signal series (round 1). Builds on #674, #901, #1008. Addresses #404. Supersedes #1301 (split C).

---

Updated this round (2026-10-13)

Merged current upstream main into the branch to clear the dirty state. One conflict (imports only) in poe.ts: main added the model-cache fetchModels (needs the getPoeModels import); this branch added the abort-signal utility imports. Kept both sides' imports.

Verification at this head: 38/38 green in poe.spec.ts; tsc --noEmit → 0 errors; per-file ESLint (--max-warnings=0) clean; prettier --check clean on touched files.

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src/api/providers/poe.ts: 1

82-100: LGTM!

Also applies to: 105-152, 155-228, 234-277

src/api/providers/__tests__/poe.spec.ts: 1

721-744: LGTM!

📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • Poe requests can be cancelled before they begin or while they’re underway, with cancellations consistently reported as cancellation errors.
  • Caller-provided cancellation signals work alongside per-request timeouts. Non-positive timeout values disable the timeout.
  • Results arriving after cancellation are rejected, and streaming stops when a request is cancelled.
  • Timeouts are reported as timeout errors, while other failures continue to be reported as completion or streaming errors.

The Poe provider now propagates external cancellation through createMessage and completePrompt. Streaming stops after cancellation, and abort listeners are removed after streaming. Prompt completion uses per-call timeout settings. Tests cover cancellation, timeout, error handling, and request options.

Changes: Poe cancellation handling

Layer / File(s)	Summary
Streaming message cancellation src/api/providers/poe.ts, src/api/providers/__tests__/poe.spec.ts	createMessage bridges the external signal to a request controller and passes its signal to streamText. It stops yielding chunks and usage after cancellation, maps aborts to AbortError, and removes the external listener. Tests cover cancellation timing, listener cleanup, non-abort errors, temperature, usage, and reasoning options.
Prompt completion abort and timeout src/api/providers/poe.ts, src/api/providers/__tests__/poe.spec.ts	completePrompt uses options.timeoutMs with the caller signal and passes the merged signal to generateText. Non-positive timeouts disable timeout handling. Tests cover caller aborts, timeouts, late results, and non-abort failures.

Priority: Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant PoeHandler
  participant streamText
  Caller->>PoeHandler: provide metadata.abortSignal
  PoeHandler->>streamText: pass request controller signal
  Caller->>PoeHandler: abort request
  PoeHandler-->>Caller: reject with Poe AbortError

Loading

sequenceDiagram
  participant Caller
  participant PoeHandler
  participant generateText
  Caller->>PoeHandler: provide abortSignal or timeoutMs
  PoeHandler->>generateText: pass merged abort signal
  generateText-->>PoeHandler: return result or error
  PoeHandler-->>Caller: return result or normalized cancellation error

Loading

Possibly related PRs

• Zoo-Code-Org/Zoo-Code#1538: Applies a similar cancellation flow to Requesty, including signal bridging, abort normalization, and late-result handling.
• Zoo-Code-Org/Zoo-Code#1293: Implements similar completePrompt timeout and createMessage cancellation behavior across several providers.
• Zoo-Code-Org/Zoo-Code#2036: Changes xAI request construction to register abort listeners after tool-choice validation, related to listener lifecycle.

Merge Risk: Minimal · up to d2660

A later caller abort no longer changes an earlier timeout into an abort error. The change is mergeable after normal checks.

Security Architecture Review

Security architecture risk: 🔵 Low · up to e5e08

Cancellation remains scoped to existing requests, with no demonstrated expansion of access or privileges. End-to-end cancellation guarantees remain partly unverified, so the assessment is low risk rather than minimal.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The demonstrated new control affects requests associated with the supplied cancellation signal and their returned output. Request-local controllers do not introduce handler-wide cancellation authority; production caller identity and broader deployment exposure were not resolved.

Trust Boundaries and Controls

• observed — Provider credentials and the configured destination remain constructor-owned. The changed request paths add cancellation signals without adding credential overrides, new tool authority, or provider-selection inputs.

Resilience and Maintainability Implications

• observed — The tests exercise late completion and cancellation during pending usage, but replace both generation entrypoints with mocks. They support output-suppression behavior without proving remote request termination or bounded settlement when downstream work stalls.

Pre-merge checks: 6 · 2

Failed checks: 2 warnings

Check name	Status	Explanation	Resolution
Regression Evidence		The changed createMessage path introduces request-local abort controllers and external listeners (src/api/providers/poe.ts:82-100). Request isolation is a concrete regression scenario: aborting on…	Add a focused PoeHandler unit test that starts two concurrent createMessage streams with separate external signals, aborts one signal, and verifies that only that request rejects with AbortError while the other request continues and c…
Lifecycle Resource Cleanup		The prior lifecycle defect remains in the changed PoeHandler.createMessage path. The loop at src/api/providers/poe.ts:181-182 can wait indefinitely on result.fullStream.next(). The finally at …	Handle outer-iterator disposal independently of the pending fullStream.next(). Expose a cancellation-aware iterator or wrapper whose return() aborts the request-local controller before awaiting disposal, and call the upstream iterator's…

Passed checks: 6 passed

Check name	Status	Explanation
Title check		The title clearly identifies the main change: adding abort-signal support to Poe for both completePrompt and createMessage.
Description check		The description gives detailed implementation, testing, compatibility, and review context. It identifies issue #404 and includes test results, but it does not use the required template headings or com…
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.
Security Boundaries		No changed path matches the security failure conditions. In src/api/providers/poe.ts, the PR adds abort-signal bridging, timeout validation through mergeAbortSignalAndTimeout, and cancellation che…
Persistence Integrity		PASS. The pull request changes only Poe request cancellation, streaming, completion handling, and tests in src/api/providers/poe.ts and src/api/providers/__tests__/poe.spec.ts. The changed paths c…

Full details: Description check

Explanation

The description gives detailed implementation, testing, compatibility, and review context. It identifies issue #404 and includes test results, but it does not use the required template headings or complete the pre-submission checklist.

Full details: Security Boundaries

Explanation

No changed path matches the security failure conditions. In src/api/providers/poe.ts, the PR adds abort-signal bridging, timeout validation through mergeAbortSignalAndTimeout, and cancellation checks. The existing Poe request inputs and tool conversion remain unchanged. Credentials remain confined to createPoe construction, and abort handling does not add telemetry or expose request data. The test-only changes do not introduce runtime behavior.

Full details: Persistence Integrity

Explanation

PASS. The pull request changes only Poe request cancellation, streaming, completion handling, and tests in src/api/providers/poe.ts and src/api/providers/__tests__/poe.spec.ts. The changed paths call streamText and generateText; they do not write, persist, roll back, or propagate persisted defaults. No changed persistence path exists.

Full details: Regression Evidence

Explanation

The changed createMessage path introduces request-local abort controllers and external listeners (src/api/providers/poe.ts:82-100). Request isolation is a concrete regression scenario: aborting one concurrent stream must not abort another stream. The focused Poe tests cover single-stream cancellation, late chunks, usage, cleanup, and errors (src/api/providers/__tests__/poe.spec.ts:246-548), but no test starts two concurrent streams with separate signals or verifies that one continues after the other aborts. The current test file has no concurrent or Promise.all coverage for createMessage.

Resolution

Add a focused PoeHandler unit test that starts two concurrent createMessage streams with separate external signals, aborts one signal, and verifies that only that request rejects with AbortError while the other request continues and completes normally.

Full details: Lifecycle Resource Cleanup

Explanation

The prior lifecycle defect remains in the changed PoeHandler.createMessage path. The loop at src/api/providers/poe.ts:181-182 can wait indefinitely on result.fullStream.next(). The finally at lines 227-229 removes the external listener only after that read settles. If a consumer calls .return() while the read is pending, async-generator disposal is queued and does not run the finally; the request-local controller is not aborted, fullStream is not closed, and the external listener can retain the request indefinitely. The current diff adds no disposal handler or regression test for this scenario. A standalone async-generator check confirms that .return() remains unresolved while the upstream next() promise is pending.

Resolution

Handle outer-iterator disposal independently of the pending fullStream.next(). Expose a cancellation-aware iterator or wrapper whose return() aborts the request-local controller before awaiting disposal, and call the upstream iterator's return()/cancel operation when supported. Ensure the external listener is removed on this path. Add a regression test with a permanently pending fullStream.next() that calls .return() and verifies request cancellation and listener removal.

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❌ Patch coverage is 92.20779% with 6 lines in your changes missing coverage. Please review.

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Actionable comments posted: 3

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Inline comments:
In `@src/api/providers/__tests__/poe.spec.ts`:
- Line 371: Update the abort-listener test around addEventListener and
removeEventListener to capture the callback registered for "abort" and assert
removal receives that exact function reference, rather than using
expect.any(Function). Preserve the existing event-name assertion and cleanup
behavior.
- Line 666: Update the timeout test around handler.completePrompt and its
generateText mock so the mock remains pending until its abortSignal is
triggered; use a controlled timer to advance past timeoutMs, then assert that
completePrompt rejects with the canonical Poe AbortError. Replace the current
early-resolving assertion so the test verifies timeout behavior and the error
path, not merely that an AbortSignal is provided.

In `@src/api/providers/poe.ts`:
- Line 160: Update the streaming flow around fullStream and the chunk yield to
check controller.signal.aborted before each yield, before awaiting result.usage,
and after awaiting usage; throw the signal’s abort error at each checkpoint so
the existing catch block normalizes it to AbortError instead of yielding late
chunks or usage.

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Both review threads addressed

• Timeout default / backward compatibility — completePrompt no longer falls back to the provider-wide request timeout: only a caller-supplied options.timeoutMs bounds the request, so callers that pass no options keep the pre-PR behavior (no timeout, no signal). The no-options test now asserts no abortSignal is handed to the SDK.
• Timeout classification — a per-request timeout is no longer reported as AbortError: the catch distinguishes a caller abort (contract AbortError, no telemetry) from a timeout the caller's signal did not cause (TimeoutError, message The Poe completion request timed out, no telemetry capture). The late-result branch classifies the same way.
• Telemetry coverage — the createMessage pre-aborted/in-flight abort tests and the completePrompt manual-abort/late-resolve tests now assert captureException is not called; the timeout test asserts the same. A real provider failure still captures telemetry (existing tests unchanged).

Local: poe.spec.ts 38 passed; tsc clean.

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src/api/providers/poe.ts-268-268: 1

268-268: Minor · Functional Correctness · Quick win

⚠️ Unverified finding
Verification ran but could not confirm this finding. It is shown for review, not as a verified issue.

Do not classify unrelated failures from signal state alone.

If generateText rejects with a provider error and the signal aborts before this catch runs, this branch replaces the provider error with TimeoutError. The caller-abort branch has the same problem. This also suppresses provider-failure telemetry. Preserve terminal provider errors and normalize only failures caused by cancellation.

Add a test that rejects generation with a provider error before aborting the signal.

Based on learnings: check the error before reclassifying an unrelated failure as a timeout or cancellation.

Source: Learnings

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Inline comments:
Review comments at @src/api/providers/poe.ts:
- Line 254: Update the cancellation checks in the generation result and catch
paths to classify cancellation using the merged signal’s first abort reason, so
a later caller abort does not replace an earlier timeout. Add a test that fires
the timeout, aborts the caller signal, and then settles generation, verifying
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Follow-up thread addressed

• Timeout classification now keys on the first abort cause of the merged signal: the merged signal retains the first reason, so a timeout that fires before a later caller abort still surfaces the distinct TimeoutError; a caller-first abort surfaces the contract AbortError. Same classification in the late-result branch and the catch.
• Added a test that fires the 20 ms timeout, aborts the caller signal afterwards and settles generation late: it rejects TimeoutError, the merged signal's reason is TimeoutError, and no telemetry is captured.

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