fix(antigravity): increase cancel timeout and ignore transport errors during prompt drainage - #11626
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…port errors - In wait-for-prompt cancelBehavior, ignore transport errors on the session/cancel RPC itself (e.g. context canceled) so the runtime continues to await the active prompt completion instead of failing immediately. - Pass an explicit cancelTimeout of 60 seconds in makeAntigravityAcpRuntime to allow long-running tools and subagents sufficient time to settle before process termination.
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This PR changes live Antigravity cancellation behavior and raises its default cancellation timeout from 15 to 60 seconds for all sessions. The change is small and targeted, but altering that production default warrants human review. You can add or adjust custom eligibility rules. Learn more. |
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| yield* acp.agent.cancel({ sessionId: started.sessionId }); | ||
| yield* acp.agent.cancel({ sessionId: started.sessionId }).pipe(Effect.ignore); |
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This changes backend cancellation semantics by swallowing a failed session/cancel notification, but the commit adds no focused case where that notification fails while the active prompt still completes and drains. The existing cancellation tests cover successful notification and timeout paths, so the exact race being fixed remains unverified and could regress unnoticed; add deterministic coverage for the failed-notification/successful-drain path.
AGENTS.md reference: AGENTS.md:L109-L109
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📝 WalkthroughWalkthroughThe ACP cancellation flow now tracks cancelled prompts and recognizes expected cancellation failures. Antigravity sessions use a 60-second timeout. The mock agent and regression test cover prompt failure with ACP error code ChangesACP cancellation handling
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant AcpJsonRpcConnectionTest
participant AcpSessionRuntime
participant acp-mock-agent
AcpJsonRpcConnectionTest->>AcpSessionRuntime: cancel active prompt
AcpSessionRuntime->>acp-mock-agent: send session/cancel
acp-mock-agent-->>AcpSessionRuntime: return ACP error -32000
AcpSessionRuntime-->>AcpJsonRpcConnectionTest: return cancelled response
AcpJsonRpcConnectionTest->>AcpSessionRuntime: submit replacement prompt
AcpSessionRuntime-->>AcpJsonRpcConnectionTest: complete replacement prompt
Suggested reviewers: Merge Risk: 🟡 Moderate · up to This change improves cancellation handling but introduces two notable gaps: an authentication error that happens to share the same ACP error code as cancellation could be silently treated as a normal cancel instead of surfacing the real auth problem, and tool calls that are mid-flight when a cancellation-triggered failure occurs may be left showing as still running instead of being marked finished. Neither issue causes data loss or a full outage, but both should be tightened before merging to avoid confusing or stuck states for users relying on Antigravity cancellation. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
Comment |
…h transport error
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| ...mockRuntimeOptions.spawn, | ||
| env: { | ||
| T3_ACP_COMPLETE_FIRST_PROMPT_ON_CANCEL: "1", | ||
| T3_ACP_FAIL_CANCEL: "1", |
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The newly added T3_ACP_FAIL_CANCEL path does not exercise the failure ignored at AcpSessionRuntime.ts:931: session/cancel is a fire-and-forget notification, and the receiving protocol explicitly catches failures from onNotification in packages/effect-acp/src/protocol.ts:215-220, so the sender's acp.agent.cancel still succeeds. Consequently this test also passes if the production Effect.ignore is reverted, leaving the reported cancel-transport regression uncovered; inject a sender-side notification/transport failure instead.
AGENTS.md reference: AGENTS.md:L109-L109
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My best attempt to resolve antigravity issue I'm having in T3 in partnership with gemini flash. Have loved using T3 code and hope to help make it a tiny bit better. I've thought about this some - not only AI generated PR. XS->S to add test suggested by Codex |
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Inline comments:
In `@apps/server/src/provider/acp/AcpJsonRpcConnection.test.ts`:
- Around line 224-313: The test around the “drains active prompt successfully…”
case must force the actual acp.agent.cancel send effect to fail, rather than
only simulating a transport failure that may be handled elsewhere. Verify the
mocked runtime’s cancel-failure configuration reaches the changed cancellation
effect and assert the cancellation still propagates while the active prompt
drains, so removing Effect.ignore causes this regression test to fail.
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| yield* acp.agent.cancel({ sessionId: started.sessionId }); | ||
| yield* acp.agent.cancel({ sessionId: started.sessionId }).pipe(Effect.ignore); |
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When Antigravity handles cancellation by failing the in-flight session/prompt RPC with -32000/context canceled, ignoring only acp.agent.cancel does not prevent the user-visible error: agent.cancel is a one-way notification (packages/effect-acp/src/client.ts:505), while the provider's RPC failure reaches activePrompt.value.fiber and is rethrown at lines 953-954. The new test instead injects an impossible-by-contract logger failure and manually completes the prompt successfully, so it never exercises this Antigravity behavior; normalize the expected prompt failure as a cancelled completion after cancellation.
AGENTS.md reference: AGENTS.md:L109-L109
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…rainage When Antigravity handles cancellation by rejecting the in-flight session/prompt RPC with code -32000 (context canceled), normalize the error as a cancelled prompt completion and suppress it in runtime.cancel so the turn completes cleanly without user-visible errors. Add deterministic test coverage via T3_ACP_FAIL_PROMPT_ON_CANCEL in acp-mock-agent.
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| env: { | ||
| T3_ACP_FAIL_PROMPT_ON_CANCEL: "1", | ||
| }, |
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The fresh final-state evidence is that this test now injects only T3_ACP_FAIL_PROMPT_ON_CANCEL, so it exercises prompt-error normalization but never makes the sender-side acp.agent.cancel(...).pipe(Effect.ignore) in AcpSessionRuntime.ts:956 fail. Reverting that Effect.ignore would leave this test green and restore the original cancellation regression; retain deterministic sender-side notification/transport failure coverage rather than replacing it.
AGENTS.md reference: AGENTS.md:L109-L109
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| const reqErr = error as EffectAcpErrors.AcpRequestError; | ||
| const msg = (reqErr.errorMessage ?? "").toLowerCase(); | ||
| return reqErr.code === -32000 || msg.includes("cancel") || msg.includes("abort"); |
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When cancellation races with an authentication failure from the in-flight prompt, this predicate classifies the failure as cancellation solely because its code is -32000. AcpRequestError.authRequired uses exactly that code in packages/effect-acp/src/errors.ts:344-348, and the Antigravity adapter normally routes it through its sign-in-required handling; here the catch at lines 1036-1045 instead converts it into a successful stopReason: "cancelled", suppressing the authentication prompt/error. Require a cancellation/abort marker in the message rather than accepting every -32000 response.
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Inline comments:
In `@apps/server/src/provider/acp/AcpSessionRuntime.ts`:
- Line 332: Update the cancellation predicate in AcpSessionRuntime to require
both the -32000 code and a cancellation-specific message or metadata indicator,
while preserving the existing cancel/abort checks for other errors. Ensure
AcpRequestError.authRequired is not classified as cancellation merely because it
uses -32000.
- Around line 1043-1045: In AcpSessionRuntime.ts lines 1043-1045, finalize every
tracked active tool call before returning the cancelled PromptResponse by
emitting terminal cancellation ToolCallUpdated events; in
AcpJsonRpcConnection.test.ts lines 225-236, assert that native-cancel-tool
receives this terminal update after cancellation.
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| _tag: "ToolCallUpdated", | ||
| toolCall: { | ||
| ...toolCall, | ||
| status: "failed", |
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When an Antigravity prompt is cancelled while a subagent tool call is active and the provider returns the context-cancelled RPC error, this synthesized update reaches AntigravityAdapter.ts:639-653, which emits task.completed with status: "failed" and marks the subagent "finished". The later finishSubagents(..., "cancelled") skips finished entries, so users see a failed child task under an otherwise cancelled turn; preserve cancellation semantics for subagents rather than forcing every active call to failed.
AGENTS.md reference: AGENTS.md:L161-L161
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Summary
Fixes
ACP transport operation call-rpc failed for method session/cancel: context canceledandcontext canceled: The request was canceled by the client.errors during Antigravity prompt cancellations. Ensures prompt drainage completes cleanly by normalizing provider cancellation RPC failures as cancelled completions and ignoring transport errors on cancel notifications.Problem & User Impact
When using the Antigravity ACP provider, triggering cancellation (either explicitly via the user Stop button or during prompt drainage) routinely fails with the following errors in the UI:
session/promptRPC with code-32000(context canceled), this error reachedactivePrompt.fiberand was rethrown in bothruntime.promptandruntime.cancel(lines 953-954).Root Cause
The Antigravity ACP backend terminates the in-flight
session/promptRPC with code-32000/context canceled: The request was canceled by the client.upon receivingsession/cancel. Bothruntime.promptandruntime.cancelrethrew this error, causing turn execution to fail with an uncaught exception banner rather than completing as{ stopReason: "cancelled" }.session/cancelNotification:In
AcpSessionRuntime.ts, whencancelBehavior === "wait-for-prompt", any transport failure on sending the cancel notification could abort cancellation before the prompt fiber finished draining.makeAntigravityAcpRuntimedid not specify an explicitcancelTimeout, defaulting to 15 seconds. Antigravity frequently coordinates subagents and long-running tools that require more than 15s to unwind cleanly.Solution
cancelled: Ref.Ref<boolean>onAcpActivePrompt.-32000, message containingcontext canceled,cancel, orabort) inruntime.promptand normalize them to{ stopReason: "cancelled" }.runtime.cancel, suppress expected prompt cancellation causes socancelresolves cleanly.In
AcpSessionRuntime.ts,acp.agent.cancel(...)is piped withEffect.ignore.Configured
cancelTimeout: Duration.seconds(60)inmakeAntigravityAcpRuntime.Added
T3_ACP_FAIL_PROMPT_ON_CANCELtoacp-mock-agent.tsand updatedAcpJsonRpcConnection.test.tsto verify that when an agent rejects the in-flight prompt with-32000 / context canceled:runtime.cancelsucceeds without throwing.promptresolves with{ stopReason: "cancelled" }.