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## 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.