feat: add MCode as a built-in ACP agent - #503
Conversation
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🦞👀 Pull request received. I will update this pull request when review starts. |
clawsweeper
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added
merge-risk: 🚨 compatibility
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Codex review: found issues before merge. Reviewed August 24, 2026, 6:07 PM ET / 22:07 UTC. ClawSweeper reviewWhat this changesThe branch registers MiniMax Code’s Merge readinessKeep open for an explicit product decision. The branch has credible live ACP evidence and current main does not include MCode, but reserving Priority: P3 Review scores
Verification
How this fits togetherACPX resolves an agent request by honoring an explicit configured command before falling back to its built-in registry. The resolved structured command starts an ACP server and returns its messages and permission requests to the CLI. flowchart LR
A[CLI agent request] --> B[Configured command lookup]
B -->|Configured| C[User agent command]
B -->|Not configured| D[Built-in agent registry]
C --> E[ACP process launch]
D --> E
E --> F[MCode ACP server]
F --> G[Agent messages and permission requests]
Decision needed
Why: The implementation is narrow, but ACPX policy treats keywords as durable product API and current configuration already provides the underlying capability. Before merge
Findings
Agent review detailsSecurityNone. Review metrics
Root-cause clusterRelationship: Members:
Proposal only: this assessment does not dispatch repair, suppress jobs, mutate sibling items, close, or merge anything. Merge-risk optionsMaintainer options:
Technical reviewBest possible solution: Have the registry owner explicitly accept or decline Do we have a high-confidence way to reproduce the issue? Not applicable: this PR proposes a new built-in keyword rather than reporting broken existing behavior; its body nevertheless includes a redacted real-agent ACP run. Is this the best way to solve the issue? Unclear: the registry row is mechanically narrow, but current configuration already provides the command and only an owner can decide whether its convenience merits a permanent keyword contract. Full review comments:
Overall correctness: patch is incorrect AGENTS.md: found and applied where relevant. Codex review notes: model internal, reasoning high; reviewed against d4c16ab32154. LabelsLabel justifications:
EvidenceWhat I checked:
Likely related people:
Rank-up movesOptional improvements that raise the rating; they are not merge blockers.
Rating scale
Overall follows the weaker of proof and patch quality. Workflow
HistoryReview history (5 earlier review cycles)
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Addressed the actionable review items in
The remaining question—whether @clawsweeper re-review |
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🦞🧹 I asked ClawSweeper to review this item again. Re-review progress:
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clawsweeper
Bot
added
proof: sufficient
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Addressed the remaining author-side documentation finding in
The real-agent proof remains in the PR body. The only remaining question is maintainer approval of @clawsweeper re-review |
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🦞🧹 I asked ClawSweeper to review this item again. Re-review progress:
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@steipete Would you mind taking a look and making the product call on this one? I’d like to get MCode included as a built-in ACP agent. While acpx mcode exec 'summarize this repository'The implementation is intentionally narrow: it only registers the native ClawSweeper’s remaining concern is the long-term keyword/support contract rather than an implementation defect. I’m in favor of accepting that contract and merging the PR, but I’d appreciate your decision as the maintainer familiar with this registry boundary. If you’re open to the built-in, I’m happy to address any final changes you’d like. |
1 participant
Closes #502
What Problem This Solves
MiniMax Code already exposes a native ACP v1 server through
mcode acp, but acpx users currently have to configure that command manually. This makes MCode unavailable through the same built-in agent workflow as Codex, Claude, Gemini, and the other supported ACP agents.Why This Change Was Made
Add
mcodeto both built-in command registries as structured argv (["mcode", "acp"]), with registry and cross-platform CLI integration coverage. The agent guide documents installation, authentication, permission handling, and the currentsession/loadlimitation without adding an adapter or sidecar.User Impact
After installing and authenticating MiniMax Code, users can run:
MCode remains responsible for its own runtime, login state, model configuration, and tools; acpx only owns the ACP client lifecycle and permission policy.
Evidence
pnpm run check— 918 tests passed; coverage thresholds passed (94.73% lines, 87.94% branches)pnpm run check:docs— formatting, markdown lint, and docs site build passedmcode acpresolution on Unix and Windows.cmdlaunch paths@minimax-ai/code0.1.2 returnedACPX_MCODE_OKthroughacpx mcode exec; the redacted transcript is belowloadSession: false, streamed a terminal tool-call lifecycle, and returned the expected result; the redacted protocol excerpt is belowRedacted real-agent transcript
This was rerun from the PR checkout against the installed, authenticated
@minimax-ai/code0.1.2 binary. The working-directory path and per-session/message/toolidentifiers are omitted; no protocol result fields were changed.
The second run used
--format json --json-strict --approve-all, asked MCode to executeprintf ACPX_TOOL_OK, and filtered the transcript to the initialize response, toollifecycle, final agent message, and prompt result:
{"jsonrpc":"2.0","id":0,"result":{"protocolVersion":1,"agentCapabilities":{"loadSession":false,"mcpCapabilities":{"http":true,"sse":true},"promptCapabilities":{"image":false,"audio":false,"embeddedContext":false}},"agentInfo":{"name":"minimax-code","title":"MiniMax Code","version":"0.1.2"}}} {"jsonrpc":"2.0","method":"session/update","params":{"update":{"sessionUpdate":"tool_call","toolCallId":"<redacted>","title":"bash","name":"bash","kind":"execute","status":"in_progress","rawInput":{"command":"printf ACPX_TOOL_OK"}}}} {"jsonrpc":"2.0","method":"session/update","params":{"update":{"sessionUpdate":"tool_call_update","toolCallId":"<redacted>","status":"completed","rawInput":{"command":"printf ACPX_TOOL_OK"},"rawOutput":{"content":[{"type":"text","text":"ACPX_TOOL_OK"}]}}}} {"jsonrpc":"2.0","method":"session/update","params":{"update":{"sessionUpdate":"agent_message_chunk","messageId":"<redacted>","content":{"type":"text","text":"ACPX_TOOL_OK"}}}} {"jsonrpc":"2.0","id":2,"result":{"stopReason":"end_turn"}}Scope Notes
execusage and explicitly state that sequential CLI invocations start fresh MCode context.AI assistance was used to investigate the integration path, implement the change, run validation, and draft this PR. All generated changes and evidence were reviewed before submission.