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## Summary Close unfinished ACP compactions before interrupted prompts settle. Previously, force cancellation could return `stopReason: cancelled` while leaving the compaction `in_progress`; SDK stream teardown and conversation reset had similar cleanup gaps. - Add shared, idempotent interruption cleanup for cancellation, force-cancel recovery, provider failures, SDK EOF/errors, and conversation reset. - Close compactions before resolving echo-less `/compact` commands, which may still be queued while their compaction is running. - Discard abandoned pending summaries and ignore late compaction openings, completions, chunks, and hooks until an identified live turn resumes. - Preserve normal early-summary buffering across ordinary result boundaries. - Add regression coverage for terminal-before-response ordering, echo-less cancellation, late SDK events, fresh-turn recovery, EOF/errors, reset, and best-effort delivery failures. After interruption, hooks without a command identity are conservatively omitted until a new live turn is identified, rather than risking attribution to the wrong compaction. Older echo-less commands without dispatch identity may likewise omit the ambiguous compaction lifecycle until turn activation. This fixes an implementation gap found while auditing the [Session Compaction RFD](https://github.com/agentclientprotocol/agent-client-protocol/blob/main/docs/rfds/session-compaction.mdx). No protocol or RFD changes are included. ## Validation - [x] `npm run test:run` — 1,397 passed, 28 skipped - [x] `npm run build` - [x] `npm run check` — ESLint and Prettier - [x] `git diff --check` Tests use mocked SDK streams; no live provider calls were made.
ACP adapter for the Claude Agent SDK
Use Claude Agent SDK from ACP-compatible clients!
This tool implements an ACP agent by using the official Claude Agent SDK, supporting:
- Context @-mentions
- Images
- Tool calls (with permission requests)
- Following
- Edit review
- TODO lists
- Nested subagent transcripts
- Interactive (and background) terminals
- Custom Slash commands
- Client MCP servers
- Session-scoped long-running goals through the provider-neutral goal extension
- Structured errors, recovery, and warnings through the opt-in session failure extension
- Concrete model and effort defaults through the opt-in recommended config value extension
- Tool permission presentation, editable choices, and durable effects through the permission extension
Learn more about the Agent Client Protocol.
To try changes that have landed on main but are not released yet, install from the
preview channel — every push to main publishes one. See
docs/RELEASES.md.
npm install @agentclientprotocol/claude-agent-acp@preview
Subagent sessions
Subagents are exposed only after bilateral capability negotiation. Until the released ACP SDKs
preserve the draft clientCapabilities.subagents field, a supporting client may advertise
nativeSubagentSessions in _meta.jetbrains.air.capabilities; the adapter mirrors the capability
in its initialize response. The canonical field remains supported and takes precedence once it is
available. Without either client signal, Agent/Task lifecycle keeps its legacy ordinary ACP
tool-call representation and child interactions stay on the root session. Clients that use the
historical _meta["subagent-transcript"] capability or forwardSubagentText session option retain
the flattened child transcript behavior.
Contribution Policy
This project does not require a Contributor License Agreement (CLA). Instead, contributions are accepted under the following terms:
By contributing to this project, you agree that your contributions will be licensed under the Apache License, Version 2.0. You affirm that you have the legal right to submit your work, that you are not including code you do not have rights to, and that you understand contributions are made without requiring a Contributor License Agreement (CLA).