claude-wrap-mcp

claude-wrap-mcp

An MCP server that lets an agent spawn and drive real Claude Code sessions, so Claude Code can run a fleet of Claude Code sub-agents. Built on claude-wrap.

Needs Node ≥ 18 and the claude CLI on your PATH. Headless sessions work everywhere; attaching to visible terminal windows is Windows-first.

Install

npm install -g claude-wrap-mcp
claude mcp add claude-wrap -- claude-wrap-mcp

Or in .mcp.json / claude_desktop_config.json:

{
  "mcpServers": {
    "claude-wrap": { "command": "npx", "args": ["-y", "claude-wrap-mcp"] }
  }
}

Tools

Tool	What it does
claude_spawn	Start a session in an absolute cwd. Returns a sessionId.
claude_ask	Send a prompt, wait for idle, return the transcript tail + parsed state.
claude_send	Send raw input (text / line / key) without waiting — for long tasks.
claude_status	Busy, mode, tokens, pending permission prompt, todos, last 5 tool names.
claude_tool_calls	Page through the session's tool calls. Ids + names by default.
claude_tool_result	One tool call by id: its args and result.
claude_snapshot	The rendered transcript lines.
claude_list	Every session, spawned here or discovered, with its backend, tmux attach command and lineage.
claude_resolve_permission	approve / deny a pending permission prompt.
claude_stop	Shut down a session this server spawned or adopted (kills a tmux session).

There is a second family, claudep_*, that drives non-interactive claude -p sessions and returns structured JSON, tool calls, usage and cost.

Two things worth knowing:

• Permission prompts are surfaced, not bypassed. When claude_ask or claude_status reports a permissionPrompt, answer it with claude_resolve_permission.
• Tool calls are paged, not dumped. A status poll stays cheap because it carries only names; claude_tool_calls lists the rest and claude_tool_result fetches one call's output by id.

Sessions in tmux (Linux/macOS)

Set CLAUDE_WRAP_BACKEND=tmux in the server's environment (e.g. box-wide). claude_* sessions then run in tmux sessions, with no change to the MCP config:

• they outlive this server: on shutdown it leaves them running, and anyone can tmux attach (the command is in claude_spawn / claude_list). Set CLAUDE_WRAP_TMUX_ON_EXIT=kill to stop them with the server instead;
• any server adopts them: pass a tmux session name (as listed) as sessionId and the session is attached in-process, with full parsed state;
• lineage: a session spawned from inside an agent that has TASK_ID / AGENT_ID set records that task and parent. claude_list shows it, and the registry entry (CLAUDE_WRAP_REGISTRY, one file per session when it's a directory) carries it for a supervisor.

See claude-wrap's README ("tmux backend") for the knobs and the entry format.

Develop

pnpm install
pnpm --filter claude-wrap-mcp build
pnpm --filter claude-wrap-mcp test

License

MIT © Alex Kaffetzakis