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fix(acp): recover sessions after cancellation fails or stalls - #21439
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ApprovabilityVerdict: Needs Human Approval Macroscope's review found this PR requires human approval — This PR changes production ACP cancellation recovery by restarting runtimes, reactivating sessions, and altering the default Antigravity runtime policy. The changes are targeted and tested, but the provider-default behavior change has user-visible lifecycle impact. No code changes detected at You can add or adjust custom eligibility rules. Learn more. |
Thread transfer impact✅ Thread transfer remains within every enforced ceiling.
Baseline: unavailable · PR result: Scenario and decoded snapshot size10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.
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The description includes all required sections: Problem, Change, Scope and approval, and Verification. It explains the failure modes, implementation, approval context, test results, limitations, and a… |
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The title clearly and concisely describes the main change: recovering ACP sessions when cancellation fails or stalls. |
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The description includes all required sections: Problem, Change, Scope and approval, and Verification. It explains the failure modes, implementation, approval context, test results, limitations, and agent details.
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Review comments at @packages/provider-acp/src/server/AcpSessionRuntime.ts:
- Around line 2435-2441: Track the activation method selected by setupSession in
make, assigning it in each setupSession branch, and update the startup shortcut
to check that recorded method instead of options.resumeMethod. This ensures the
shortcut recognizes when setupSession used resume even if resumeMethod was
omitted.
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📒 Files selected for processing: 4
apps/server/src/orchestration-v2/Adapters/AcpAdapterV2.test.tsapps/server/src/orchestration-v2/Adapters/AntigravityAdapterV2.tspackages/provider-acp/src/server/AcpSessionRuntime.tspackages/provider-acp/src/server/adapter.ts
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Carry pingdotgg#21439, preserving current runtime formatting and tests.
Carry pingdotgg#22698 and the activation-preference prerequisite from pingdotgg#21438 required by pingdotgg#21439.
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Thanks for working on this! I tested head This was an isolated runner using the head's actual Antigravity adapter/ACP services and official runtime, with a fresh profile. It wasn't a full T3 orchestration or desktop UI test. These checks ran on 2026-10-23 (UTC). I also reran the same scenario on the unmodified main snapshot from my earlier report, The direct-resume change is visible: after the failed Stop, the replacement runtime successfully performs
Separately, the server child survived Stop as PPID 1 in its own PGID. I'm keeping that observation separate from this PR's recovery scope. The three focused cancellation-recovery regression tests passed here too. Hopefully this helps fill in the native macOS/account verification gap. This is one controlled live reproduction, not a claim about every cancellation path; I have the timestamped RPC/turn and PID evidence if useful. Thanks again for working on the recovery/cleanup behavior! |
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Following up on my live verification, I narrowed down why this particular background-command session still fails to finish after a successful resume. This also relates to #14619. Thanks again for working on the recovery path. The same failure reproduces with a small JSON-RPC client talking directly to the official Antigravity ACP runtime, without any T3 adapter or UI. A persisted These checks ran on 2026-10-24: macOS arm64, official ACP 1.3.0, personal Google account, Direct ACP reproduction
The recovered turn's completed answer and trajectory-state events carry the same trajectory ID. I did not observe a Same-snapshot comparisonThe database snapshot after cancellation has one I restored three independent copies of that exact snapshot, each in a fresh profile, then sent the same
I compared every table before starting the three runtimes. Each modified copy differs only in that row's The bundled Python code waits in This seems to explain why the PR's successful runtime restart and direct resume were insufficient for this sample: they restore the same stale native task state. I do not have the Go harness implementation to identify the exact faulty function. The evidence points toward task cancellation/reconciliation on native session restore, rather than another missing There were seven synthetic prompt requests in this investigation. All recorded test processes and copied credential profiles were removed. No existing conversations or installed T3/runtime files were changed. The 40/65-second limits are observation bounds; I am not claiming every hang has this cause. The compact evidence below includes only state events, durations, and database differences, with no raw debug logs or credentials. Hopefully this gives a more actionable native-runtime reproduction and helps define the remaining recovery boundary. Investigation assisted by GPT-6 Astra through T3 Code's Codex harness; Gemini was the runtime/model under test. Sanitized protocol events and snapshot differences{
"runtime": {
"platform": "macOS arm64",
"official_runtime": "Antigravity ACP 1.3.0",
"model": "gemini-4-argon-high",
"mode": "yolo",
"client": "standalone Python JSON-RPC client, no T3 code or adapters",
"debug": "official --debug flag; executable and Go harness unmodified"
},
"runtime_sha256": {
"agy_acp_server.par": "cb1f0725183ed922079ed6cd1d2422b4d8be44c5fb60be3e9a43d8d04f99a18e",
"localharness_external": "b04b00662c1821b953a409d43626b86d1229130eeb2078b4e1304c06199aa481"
},
"runs": {
"direct-r1": {
"requests": [
{
"client": "before",
"method": "session/prompt",
"started_at": "2026-10-24T06:50:24.440700+00:00",
"finished_at": "2026-10-24T06:50:33.437629+00:00",
"elapsed_seconds": 8.997,
"outcome": "rpc-result",
"stopReason": "end_turn"
},
{
"client": "resumed",
"method": "session/resume",
"started_at": "2026-10-24T06:51:33.921074+00:00",
"finished_at": "2026-10-24T06:51:35.414490+00:00",
"elapsed_seconds": 1.493,
"outcome": "rpc-result",
"stopReason": null
},
{
"client": "resumed",
"method": "session/prompt",
"started_at": "2026-10-24T06:51:37.090086+00:00",
"finished_at": "2026-10-24T06:52:42.091020+00:00",
"elapsed_seconds": 65.001,
"outcome": "rpc-timeout",
"stopReason": null
},
{
"client": "new-control",
"method": "session/prompt",
"started_at": "2026-10-24T06:52:48.516063+00:00",
"finished_at": "2026-10-24T06:53:07.843509+00:00",
"elapsed_seconds": 19.327,
"outcome": "rpc-result",
"stopReason": "end_turn"
},
{
"client": "before",
"method": "session/prompt",
"started_at": "2026-10-24T06:50:33.437807+00:00",
"finished_at": "2026-10-24T06:51:30.784594+00:00",
"elapsed_seconds": 57.347,
"outcome": "runtime-terminated-without-prompt-result",
"stopReason": null
}
],
"native_halt_requests": [
{
"client": "before",
"native_websocket_halt_request_sent": true
}
],
"trajectory_states": [
{
"client": "before",
"at": "2026-10-24T06:50:24.441976+00:00",
"trajectoryId": "216e3a5f-6eaf-4f0b-bd64-ea5c0c8386bf",
"state": "STATE_RUNNING"
},
{
"client": "before",
"at": "2026-10-24T06:50:33.436911+00:00",
"trajectoryId": "216e3a5f-6eaf-4f0b-bd64-ea5c0c8386bf",
"state": "STATE_FULLY_IDLE"
},
{
"client": "before",
"at": "2026-10-24T06:50:33.438506+00:00",
"trajectoryId": "216e3a5f-6eaf-4f0b-bd64-ea5c0c8386bf",
"state": "STATE_RUNNING"
},
{
"client": "before",
"at": "2026-10-24T06:51:00.724013+00:00",
"trajectoryId": "216e3a5f-6eaf-4f0b-bd64-ea5c0c8386bf",
"state": "STATE_WAITING_FOR_TASKS"
},
{
"client": "new-control",
"at": "2026-10-24T06:52:48.516904+00:00",
"trajectoryId": "cdc0f364-ded8-4624-a6da-b280614a2c03",
"state": "STATE_RUNNING"
},
{
"client": "new-control",
"at": "2026-10-24T06:53:07.842497+00:00",
"trajectoryId": "cdc0f364-ded8-4624-a6da-b280614a2c03",
"state": "STATE_FULLY_IDLE"
},
{
"client": "resumed",
"at": "2026-10-24T06:51:37.090643+00:00",
"trajectoryId": "216e3a5f-6eaf-4f0b-bd64-ea5c0c8386bf",
"state": "STATE_RUNNING"
},
{
"client": "resumed",
"at": "2026-10-24T06:51:43.901595+00:00",
"trajectoryId": "216e3a5f-6eaf-4f0b-bd64-ea5c0c8386bf",
"state": "STATE_WAITING_FOR_TASKS"
}
]
},
"seed-original": {
"requests": [
{
"client": "seeded",
"method": "session/resume",
"started_at": "2026-10-24T06:52:49.435251+00:00",
"finished_at": "2026-10-24T06:52:51.355227+00:00",
"elapsed_seconds": 1.92,
"outcome": "rpc-result",
"stopReason": null
},
{
"client": "seeded",
"method": "session/prompt",
"started_at": "2026-10-24T06:52:53.004535+00:00",
"finished_at": "2026-10-24T06:53:33.005722+00:00",
"elapsed_seconds": 40.001,
"outcome": "rpc-timeout",
"stopReason": null
}
],
"native_halt_requests": [],
"trajectory_states": [
{
"client": "seeded",
"at": "2026-10-24T06:52:53.005066+00:00",
"trajectoryId": "216e3a5f-6eaf-4f0b-bd64-ea5c0c8386bf",
"state": "STATE_RUNNING"
},
{
"client": "seeded",
"at": "2026-10-24T06:52:57.198383+00:00",
"trajectoryId": "216e3a5f-6eaf-4f0b-bd64-ea5c0c8386bf",
"state": "STATE_WAITING_FOR_TASKS"
}
]
},
"seed-terminal": {
"requests": [
{
"client": "seeded",
"method": "session/resume",
"started_at": "2026-10-24T06:53:17.026535+00:00",
"finished_at": "2026-10-24T06:53:18.735094+00:00",
"elapsed_seconds": 1.709,
"outcome": "rpc-result",
"stopReason": null
},
{
"client": "seeded",
"method": "session/prompt",
"started_at": "2026-10-24T06:53:20.513619+00:00",
"finished_at": "2026-10-24T06:53:26.821896+00:00",
"elapsed_seconds": 6.308,
"outcome": "rpc-result",
"stopReason": "end_turn"
}
],
"native_halt_requests": [],
"trajectory_states": [
{
"client": "seeded",
"at": "2026-10-24T06:53:20.514115+00:00",
"trajectoryId": "216e3a5f-6eaf-4f0b-bd64-ea5c0c8386bf",
"state": "STATE_RUNNING"
},
{
"client": "seeded",
"at": "2026-10-24T06:53:26.820991+00:00",
"trajectoryId": "216e3a5f-6eaf-4f0b-bd64-ea5c0c8386bf",
"state": "STATE_FULLY_IDLE"
}
]
},
"seed-canceled": {
"requests": [
{
"client": "seeded",
"method": "session/resume",
"started_at": "2026-10-24T06:55:00.828384+00:00",
"finished_at": "2026-10-24T06:55:02.684940+00:00",
"elapsed_seconds": 1.857,
"outcome": "rpc-result",
"stopReason": null
},
{
"client": "seeded",
"method": "session/prompt",
"started_at": "2026-10-24T06:55:04.140698+00:00",
"finished_at": "2026-10-24T06:55:15.858204+00:00",
"elapsed_seconds": 11.718,
"outcome": "rpc-result",
"stopReason": "end_turn"
}
],
"native_halt_requests": [],
"trajectory_states": [
{
"client": "seeded",
"at": "2026-10-24T06:55:04.141525+00:00",
"trajectoryId": "216e3a5f-6eaf-4f0b-bd64-ea5c0c8386bf",
"state": "STATE_RUNNING"
},
{
"client": "seeded",
"at": "2026-10-24T06:55:15.857123+00:00",
"trajectoryId": "216e3a5f-6eaf-4f0b-bd64-ea5c0c8386bf",
"state": "STATE_FULLY_IDLE"
}
]
}
},
"input_database_differences": {
"seed-terminal": [
{
"table": "steps",
"row": 4,
"column": "status",
"old": 2,
"new": 3
},
{
"table": "steps",
"row": 4,
"column": "step_payload",
"changed_bytes": 1,
"old_length": 4988,
"new_length": 4988
}
],
"seed-canceled": [
{
"table": "steps",
"row": 4,
"column": "status",
"old": 2,
"new": 6
},
{
"table": "steps",
"row": 4,
"column": "step_payload",
"changed_bytes": 1,
"old_length": 4988,
"new_length": 4988
}
]
}
} |
Settle failed cancellations and replace the runtime before another turn. Resume the saved conversation once, preserving its history. Adapted from upstream recovery and activation work: pingdotgg#21439 pingdotgg#21438 Enable the current adapter's restart-on-interrupt policy for Antigravity and cover acknowledged Stop with an additional provider regression.
Problem
A failed ACP cancellation can leave a turn active, and a successful cancellation can leave a prompt that never acknowledges Stop. For every ACP flavor, finalize the interrupted turn after its bounded grace period and restart the runtime before admitting another turn. Antigravity opts into restart after Stop, and resume-preferring providers restart directly on the saved session without a throwaway session or duplicate resume request. Providers without resume support retain load activation after restart.
Change
Rebuilt from @EinMelih's #20709. This completes the three-layer replacement and adds recovery for the unacknowledged-cancel case missing from the original.
Scope and approval
Maintainer takeover of the existing bug fixes in #20709, following the takeover direction. This layer isolates one part of that scope; human approval remains required where noted.
Verification
Three independent review rounds (Opus and Sol). Round one found a load-only restart fallback bug, fixed and covered. A later CodeRabbit finding exposed an unrelated dangling allowed root rejecting valid workspace requests; fixed by omitting independently unresolvable allowed roots while requested paths still fail closed. Round three is clean; the combined current-head suite passes 131/131.
Current-stack test evidence (head
378aee73d9; real service plus mock process, not a native-provider exercise).Headless Linux only. Real Antigravity CLI/account behavior, macOS, Windows, iOS, Android, and Electron desktop are unverified. Human approval and native-provider verification remain required; this is not a claim of merge readiness.
Implementation: GPT-6.1 Sol (high), tests: GPT-6 Astra (high), Codex harness through T3 Code.