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Port the shared ACP layer from the Orchestrator V2 branch: effect-acp with ACP v1/v2 negotiation, the session runtime (process-group ownership, lazy auth, v2 plan/usage/session-info events), runtime model, client policy, terminals, session config, native logging, and the Grok and Antigravity support modules. Add the stdio (`t3 acp-mcp-bridge`) and MCP-over-ACP bridges, and wire them into the V1 Grok and Antigravity adapters so both reach T3 MCP. Keep V1 working on the new runtime: Grok picks models through config options on ACP v2, stops its process group with SIGTERM, and V1 Antigravity uses the shared client-file containment. Keep main behaviors V2 dropped: the session/resume timeout, xAI error completions, and initialize model state in synthetic load responses. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This PR substantially changes production ACP runtime behavior across protocol negotiation, authentication, process lifecycle, permissions, MCP access, CLI startup, and multiple providers. It also introduces new capabilities, changes product behavior, and adds static-analysis suppressions, so the scope and risk require human review. Not approved because:
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Thread transfer impact✅ Thread transfer remains within every enforced ceiling.
Baseline: 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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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe pull request adds ACP v1/v2 compatibility across the protocol package and server runtime. It adds session, provider, MCP, terminal, and permission handling, updates provider adapters and Grok ACP processing, and adds process-containment support, fixtures, tests, and CLI support. ChangesACP protocol and runtime
Priority: ➖ Normal Estimated code review effort: 5 (Critical) | ~120 minutes Sequence Diagram(s)sequenceDiagram
participant AcpSessionRuntime
participant AcpMcpOverAcpBridge
participant AuthenticatedMcpEndpoint
AcpSessionRuntime->>AcpMcpOverAcpBridge: Forward MCP request
AcpMcpOverAcpBridge->>AuthenticatedMcpEndpoint: Send authenticated HTTP request
AuthenticatedMcpEndpoint-->>AcpMcpOverAcpBridge: Return MCP response and session headers
AcpMcpOverAcpBridge-->>AcpSessionRuntime: Return MCP result
Suggested reviewers: Merge Risk: 🟡 Moderate · up to After cancelling a Grok or Cursor prompt, a delayed update can prematurely complete the next prompt. Resolve prompt completion matching before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 6
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@apps/server/src/mcp/AcpMcpOverAcpBridge.ts`:
- Around line 97-142: Update send so connection.mutex serializes only the
initialize handshake; allow cancellation notifications and client responses to
proceed while later SSE responses remain open. In responsePayloads handling,
forward server-initiated requests to the agent or explicitly reject them instead
of silently collecting and dropping them.
In `@apps/server/src/mcp/AcpMcpStdioBridge.ts`:
- Around line 407-415: Update the `callAcpMcpTool` execution in the stdio bridge
to handle failures explicitly: report a concise error to stderr and set a
nonzero exit code instead of allowing a raw rejection to escape. Ensure
successful calls always write valid JSON, using null when the result is absent.
In `@apps/server/src/provider/acp/AcpSessionRuntime.ts`:
- Around line 2542-2557: Add the session-load timeout to the RPC in
`resumeSession`: apply `options.sessionLoadTimeout ?? defaultSessionLoadTimeout`
to `acp.agent.resumeSession` and convert a timeout into the appropriate
transport error. Preserve the existing request logging and session adoption
flow.
In `@apps/server/src/provider/acp/AntigravityClientFiles.ts`:
- Around line 49-52: Update the missing-entry fallback in the path-resolution
flow to resolve the deepest existing ancestor with realPath, then append the
missing path components before checking containment. Never fall back to a
lexical path; reject the request if an existing ancestor cannot be resolved.
Reuse acpCanonicalPathForContainment from AcpClientPolicy.ts if applicable.
In `@apps/server/src/provider/Layers/GrokAdapter.ts`:
- Around line 1246-1250: Update the ACP v2 `modelRuntime` wrapper so
`setSessionModel` preserves reasoning-effort changes when the model ID is
unchanged: apply the requested effort through the `thought_level` config option,
or fail explicitly if that option is unavailable. Keep the existing ACP v1
behavior in `legacyModelApi` unchanged.
In `@packages/effect-acp/src/client.ts`:
- Around line 1293-1318: Update the v2 prompt flow using promptCompletions and
dispatchNotification to associate each idle update with its originating prompt,
so a late update cannot resolve a subsequent prompt’s Deferred; alternatively,
prevent the next prompt from registering its Deferred until the previous idle
update is consumed.
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⛔ Files ignored due to path filters (3)
packages/effect-acp/src/_generated/meta.gen.tsis excluded by!**/_generated/**packages/effect-acp/src/_generated/schema-v1.gen.tsis excluded by!**/_generated/**packages/effect-acp/src/_generated/schema.gen.tsis excluded by!**/_generated/**
📒 Files selected for processing (81)
apps/server/.gitignoreapps/server/scripts/acp-mock-agent.tsapps/server/scripts/acp-thread-spawn-helper.capps/server/scripts/acpMockCancellationState.tsapps/server/src/bin.test.tsapps/server/src/bin.tsapps/server/src/binCli.tsapps/server/src/cli/acpMcpBridge.tsapps/server/src/cli/app.test.tsapps/server/src/cli/pair.test.tsapps/server/src/cli/theme.test.tsapps/server/src/mcp/AcpMcpOverAcpBridge.test.tsapps/server/src/mcp/AcpMcpOverAcpBridge.tsapps/server/src/mcp/AcpMcpStdioBridge.test.tsapps/server/src/mcp/AcpMcpStdioBridge.tsapps/server/src/provider/AntigravityAuth.test.tsapps/server/src/provider/AntigravityInstallation.test.tsapps/server/src/provider/AntigravityInstallation.tsapps/server/src/provider/Drivers/AntigravityDriver.test.tsapps/server/src/provider/Layers/AntigravityAdapter.test.tsapps/server/src/provider/Layers/AntigravityAdapter.tsapps/server/src/provider/Layers/AntigravityProvider.test.tsapps/server/src/provider/Layers/AntigravityProvider.tsapps/server/src/provider/Layers/CursorAdapter.tsapps/server/src/provider/Layers/CursorProvider.test.tsapps/server/src/provider/Layers/CursorProvider.tsapps/server/src/provider/Layers/GrokAdapter.test.tsapps/server/src/provider/Layers/GrokAdapter.tsapps/server/src/provider/Layers/GrokProvider.tsapps/server/src/provider/NativeProtocolLogging.tsapps/server/src/provider/acp/AcpClientPolicy.test.tsapps/server/src/provider/acp/AcpClientPolicy.tsapps/server/src/provider/acp/AcpClientTerminals.test.tsapps/server/src/provider/acp/AcpClientTerminals.tsapps/server/src/provider/acp/AcpCoreRuntimeEvents.test.tsapps/server/src/provider/acp/AcpCoreRuntimeEvents.tsapps/server/src/provider/acp/AcpJsonRpcConnection.test.tsapps/server/src/provider/acp/AcpNativeLogging.tsapps/server/src/provider/acp/AcpRuntimeModel.test.tsapps/server/src/provider/acp/AcpRuntimeModel.tsapps/server/src/provider/acp/AcpSessionConfig.test.tsapps/server/src/provider/acp/AcpSessionConfig.tsapps/server/src/provider/acp/AcpSessionRuntime.processTree.test.tsapps/server/src/provider/acp/AcpSessionRuntime.tsapps/server/src/provider/acp/AcpT3Mcp.tsapps/server/src/provider/acp/AntigravityAcpSupport.test.tsapps/server/src/provider/acp/AntigravityAcpSupport.tsapps/server/src/provider/acp/AntigravityClientFiles.tsapps/server/src/provider/acp/AntigravityProtocol.test.tsapps/server/src/provider/acp/AntigravityProtocol.tsapps/server/src/provider/acp/CursorAcpCliProbe.test.tsapps/server/src/provider/acp/CursorAcpExtension.tsapps/server/src/provider/acp/CursorAcpSupport.test.tsapps/server/src/provider/acp/GrokAcpCliProbe.test.tsapps/server/src/provider/acp/GrokAcpSupport.test.tsapps/server/src/provider/acp/GrokAcpSupport.tsapps/server/src/provider/acp/XAiAcpExtension.test.tsapps/server/src/provider/acp/XAiAcpExtension.tsapps/server/src/provider/testFixtures/grok-text-mock-agent.mjsapps/server/src/textGeneration/AntigravityTextGeneration.test.tsapps/server/src/textGeneration/AntigravityTextGeneration.tsapps/server/src/textGeneration/GrokTextGeneration.test.tsdocs/user/permission-modes.mdpackages/effect-acp/package.jsonpackages/effect-acp/scripts/generate.tspackages/effect-acp/src/_internal/shared.tspackages/effect-acp/src/agent.test.tspackages/effect-acp/src/agent.tspackages/effect-acp/src/client.test.tspackages/effect-acp/src/client.tspackages/effect-acp/src/compat.tspackages/effect-acp/src/protocol.test.tspackages/effect-acp/src/protocol.tspackages/effect-acp/src/rpc.tspackages/effect-acp/src/schema.test.tspackages/effect-acp/src/schema.tspackages/effect-acp/src/terminal.tspackages/effect-acp/test/fixtures/acp-mock-peer.tspackages/effect-acp/test/fixtures/antigravity-initialize.jsonpackages/shared/src/nodeRuntime.test.tspackages/shared/src/nodeRuntime.ts
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The bridge held a per-connection lock for each whole HTTP exchange, and ACP runs notification handlers on its stdin reader. A notification sent during a long tool call waited for the call, which froze every other message in the ACP session. Hold the lock only until the MCP session id exists, like the stdio bridge's handshake barrier. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
- Stop no longer sleeps the full grace after SIGTERM. It polls and moves on once the cgroup root or the process group is gone, as main did. Each Grok stop took at least 1 s, one session at a time. - Grok no longer spawns detached on Windows. taskkill /T needs no detached leader, and a detached child leaves libuv's kill-on-close job and its hidden console. - With a cgroup lease, the /proc ownership watcher no longer polls every 25 ms for the whole session. The cgroup needs only the root. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
The composer offers every access mode for every provider, so the page should not say Grok does not offer it. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
The adapter switched a v2 Grok's model through the model config option, but text generation always sent session/set_model, which v2 removed. A commit message or title request with a non-default model then failed with method not found. Share the adapter's v1/v2 model control with text generation. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
grokAcpModelControl is its only caller now. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
The runtime upgrade moved the ACP mock agent to v2, so the V1 adapter tests stopped covering the v1 message shape that released Grok, cursor-agent and Antigravity speak. Add a v1 profile to the mock (T3_ACP_WIRE=v1) that translates the wire in both directions and checks each outgoing reply against the v1 schema. Antigravity reports protocol version 2 with the v1 shape, as the real agent does. The adapter suites now run on both wires. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
… idle Without a delegated cgroup, each Grok session polled /proc every 25 ms for its whole life: 3.2% of a core for one idle session and 6.9% for four on a Linux desktop. Keep the 25 ms rate while a prompt runs and right after the tracked tree changes, and back off to 500 ms when the session is idle and stable. Idle cost drops to about 0.2% for one session and 0.6% for four. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Correction to my inline Effect Service Conventions comment on Posted via Macroscope — Effect Service Conventions |
acpMcpToolApprovalElicitationDisposition allowed tagged MCP tool approvals in Auto-accept edits, assuming they came from T3's own MCP endpoint. Codex-style agents send the same codex_approval_kind tag for every MCP server, and the request names no server T3 controls. Ask instead, as the permission-modes guide says for non-edit actions. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
When policy approved a permission request without asking, Grok and Cursor selected allow_always whenever the agent offered it. An agent can keep that grant across a session resume, so a thread later switched to Supervised might not ask. Add acpAutoApprovalOptionId to AcpClientPolicy, which prefers allow_once, and use it in both adapters. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
A write to a new path below a symlinked directory fell back to the lexical parent, so mkdir -p followed the link and wrote outside the workspace. Resolve the deepest existing ancestor instead, and reject the request when an existing entry cannot be resolved. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
The runtime's public resumeSession called session/resume with no timeout, so an agent that never answered hung the caller. Both resume paths now share the session load timeout from #9348. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
A failed call rejected the top-level await, so the agent saw an unhandled rejection's stack trace. It now prints the error message to stderr with exit code 1, and a response without a result prints null. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
…static layer Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
… scope The ported runtime closes its scope when the agent exits, and that scope was the adapter's session scope. The close could interrupt the adapter's event consumer before it handled ConnectionTerminated, so Antigravity and the registry adapter could keep a dead session without emitting session.exited. The runtime now forks a child scope for its own resources, which the caller's scope still closes on stop. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Grok and Antigravity run on main's old ACP runtime and get T3 MCP only as an
httpserver, which ACP agents often drop. The fixed runtime and the MCP bridges live on the Orchestrator V2 branch (#2829), which will not land soon.This ports V2's shared ACP layer to main and wires it into the V1 Grok and Antigravity adapters. It is also the base for the ACP registry follow-up.
What changed
effect-acpgains ACP v1/v2 negotiation and acompatshape the server reads. The session runtime gets process-group ownership (cgroup on Linux), lazy auth, and v2 plan, usage, and session-info events. Also ported: the runtime model, client policy, client terminals, session config, native logging, and Grok and Antigravity support.t3 acp-mcp-bridgestdio bridge (with a fast path inbin.ts, so the full CLI is split intobinCli.ts) and an MCP-over-ACP bridge.provider/acp/AcpT3Mcp.tswires both into V1 Grok and Antigravity. The credential goes in the bridge env, never on its command line.session/set_modelon v1.session/resumetimeout from #9348stopReason: "error"failing the prompt with Grok's messagegrok agentdid withacceptEditsanyway.docs/user/permission-modes.mdis updated for both.V2 compatibility
packages/effect-acp, the stdio MCP bridge test,NativeProtocolLogging.ts,AcpClientTerminals,AcpSessionConfig,AcpCoreRuntimeEvents,AntigravityInstallation,nodeRuntime,bin.ts,cli/acpMcpBridge.ts, andapps/server/.gitignore.AcpRuntimeModel.ts: a localAcpSessionInfoMetadatareplacesOrchestrationV2ProviderThreadNativeMetadata. A local set of main's T3 MCP tool names replaces@t3tools/shared/t3McpToolPresentation, and the name-gated tests use those names. Synthetic load responses keepmodelsagain.AcpSessionRuntime.ts: the resume timeout, plus two un-exported Windows helpers. Review fixes: a process-group stop returns once the agent exits instead of sleeping the full grace, Grok does not spawn detached on Windows, a cgroup lease skips the/procwatcher, and without a cgroup the watcher backs off while a session is idle. The publicresumeSessionuses the resume timeout too, and the unused staticlayeris gone. On agent exit the runtime closes a child scope it forks for its own resources, not the caller's scope, so a V1 adapter's event consumer still handlesConnectionTerminated(V2's adapter reacts throughonTerminationinstead).AcpMcpOverAcpBridge.ts: holds its per-connection lock only until the MCP session exists, so a notification cannot stall the ACP reader behind a slow tool call.AcpMcpStdioBridge.ts:acp-mcp-callprints a failed call to stderr with exit code 1, not as an unhandled rejection.AntigravityClientFiles.ts: a new path resolves through its deepest existing ancestor, so a write below a linked directory cannot land outside the workspace. V2 should take this.XAiAcpExtension.ts: error completions restored;extractXAiAskUserQuestionIdentityremoved; unused exports made private.GrokAcpSupport.ts:GROK_SUPPORTED_RUNTIME_MODESremoved (main has nosupportedRuntimeModescontract); unused exports made private;normalizeGrokReasoningEffortstays exported;grokAcpModelControlgives text generation the adapter's v1/v2 model switch.AntigravityAcpSupport.ts: the model helpers stay exported for V1.AcpClientPolicy.ts:unknownRecordis private.AcpClientPolicy.ts:acpMcpToolApprovalElicitationDispositionasks in Auto-accept edits, because agents tag MCP tool approvals for any MCP server, not only T3's. V2 should take this.AcpClientPolicy.ts: newacpAutoApprovalOptionIdpicksallow_oncebeforeallow_alwayswhen policy auto-approves, so a grant cannot outlive a later switch to Supervised. V1 Grok and Cursor use it; V2's adapters should too.AcpNativeLogging.ts: dead helpers removed.AntigravityProtocol.tsandeffect-acp/client.ts: hot-path schemas hoisted.acp-mock-agent.ts: a Grok model profile (T3_ACP_GROK), v1 option ids in Cursor's model list, and v2plan_update/tool_call_updatefor two knobs that sent v1 updates on the v2 wire.provider/acp/AcpT3Mcp.ts(V1 MCP wiring),scripts/acpMockV1Wire.ts(the mock's ACP v1 profile,T3_ACP_WIRE=v1), andAcpAdapterSupport.tsstays.AcpSessionRuntime.ts,AcpMcpOverAcpBridge.ts,AcpMcpStdioBridge.ts,AntigravityClientFiles.ts,AcpClientPolicy.ts, andGrokAcpSupport.ts. Re-export what V2's adapters import (the knip-driven un-exports). Drop the V1 adapter changes andAcpT3Mcp.tsalong with the V1 adapters.binCli.tsis a rename on both sides; keep main'straceCommand.Likely conflicts with open PRs
AcpSessionRuntime.ts,AntigravityAcpSupport.ts,AcpJsonRpcConnection.test.ts, and the mock (fix(antigravity): say why the runtime crashed instead of a generic line #13387 also touchesAntigravityInstallation*). These will conflict and need a rebase onto the new runtime.AntigravityAdapter.tsand its test (MCP wiring and client files moved).antigravityAuthSupport.ts, so there is no text conflict.Notes
protocolVersion: 2negotiatinginitializein V2's recordings.cursor-agentwas never run against it, since V2 dropped Cursor ACP first. Worth a quick check if this lands before the Cursor SDK switch.auth_required). Antigravity still authenticates eagerly./procownership watcher polls a Grok session every 25 ms while a prompt runs, and backs off to 500 ms while the session is idle and its process tree is stable. Measured on a Linux desktop, with each session as the agent plus one child process (7 threads each), idle watcher cost went from 3.2% of one core for 1 session and 6.9% for 4, to about 0.2% and 0.6%. During a prompt it is still about 3% of one core per session.protocolVersionit reports, whileeffect-acppicks the wire from the reply shape. A Grok that reports 2 but answers in the v1 shape, as Antigravity does, would take the v2 path. On the v2 path the reasoning effort is also dropped without a warning. Released Grok reports 1, so no user hits this today.Testing
vp test runon all ofprovider/acp, both MCP bridges, the V1 Grok, Antigravity, and Cursor adapter, provider, and driver tests, Antigravity auth and installation, Grok, Antigravity, and Cursor text generation, and the CLI tests: 38 files, 751 passed (2 real-CLI probe files skipped).packages/effect-acp(70 passed) andpackages/sharednodeRuntime(11 passed).tsc --noEmitforapps/server,packages/effect-acp,packages/shared. Lint and format on changed files.knipexports, files, and dependencies for those workspaces.Made by Claude Opus 5.5 (1M context) in Claude Code, orchestrated from T3 Code.
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