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claude-agent-acp/README.md
nikita-ashihmin 190a00f68f feat: answer /mcp in chat with the MCP server status and a reconnect (#1218) 
## Summary

In an ACP client, `/mcp` showed the CLI text "… Use `/mcp` in the
terminal for details." The user of an ACP client has no terminal. In SDK
mode, Claude Code also refuses `/mcp reconnect|enable|disable` with
"Reconnect, enable, and disable aren't available in this session." and
changes nothing.

- `/mcp` and `/mcp reconnect|enable|disable [<server>|all]` still run as
a normal Claude Code turn. The adapter replaces the text of the local
command, through the same hook that `/usage` uses. Prompt order, cancel,
and the provider update stay with the turn.
- For an action, the adapter runs it in that turn through the SDK
control API (`reconnectMcpServer`, `toggleMcpServer`). It shows one
result line for each server, then the status list.
- The status list comes from `query.mcpServerStatus()`. It has a summary
line and groups by status: failed, needs authentication, connecting,
connected, and disabled on one line. A failed server shows a short
cleaned error. A list is used and not a table, because a table breaks
words in narrow columns.
- Useful CLI sentences stay, for example "There's no MCP server named
…". Sentences that point to the terminal are removed.
- After an explicit reconnect, a server from the ACP session that needs
authentication starts the existing MCP OAuth flow, when the client
supports URL elicitation.
- `/mcp` is advertised with the input hint `[reconnect|enable|disable
[<server>|all]]` and is hidden on history replay.

## Other commits in this branch

This branch also carries commits of other work: skill command metadata
for AIR, a faster `session/load` replay, and the resumed permission
mode. They can move to separate PRs if preferred.

## Tests

- `src/tests/mcp-command.test.ts` (61 tests). The fake CLI answers with
the real SDK-mode texts and message shapes (synthetic assistant +
result) and does not change any status.
- A live run through the adapter with a broken and a working stdio
server: `/mcp`, `/mcp disable good`, `/mcp enable good`, `/mcp reconnect
broken`, `/mcp reconnect nosuch`.
- `compare.ts` allows one new difference against the origin/main
baseline: the `mcp` command in `available_commands_update`. The baseline
files are unchanged.
- `npm run check` and `npm run test:run` pass.
2026-10-02 17:37:59 +04:00

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ACP adapter for the Claude Agent SDK

npm

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)
  • Compact file changes through the negotiated AIR diff patch extension
  • Following
  • Edit review
  • TODO lists
  • Nested subagent transcripts
  • Interactive (and background) terminals
  • Custom Slash commands
  • Client MCP servers
  • /mcp in the chat: the MCP server status as a list. The adapter runs /mcp reconnect, /mcp enable, and /mcp disable through the SDK control API, because Claude Code refuses them in SDK mode. A reconnect of an ACP server that needs authentication starts MCP OAuth through URL elicitation
  • Session-scoped long-running goals for AIR through the goal extension under _meta.jetbrains.air.goal
  • 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
  • One fact per field in every tool call report, as the ACP tool call contract defines
  • All AIR extensions, capabilities, and _meta keys: AIR extensions

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. See AIR extensions.

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).