MCP

Configure stdio MCP servers under mcp.servers in config:

{
  "mcp": {
    "servers": {
      "github": {
        "command": "bunx",
        "args": ["@modelcontextprotocol/server-github"],
        "env": { "GITHUB_TOKEN": "${GITHUB_TOKEN}" }
      }
    }
  }
}

${GITHUB_TOKEN} is expanded from the environment for MCP env values.

Runtime (packages/mcp): stdio transport, tools namespaced onto the registry (e.g. mcp_<server>_<tool>). HTTP: POST /mcp/servers, DELETE /mcp/servers/{name}.

MCP write-like tools should still hit the permission gate.

In-session

/mcp add <name> <command> [args…] and /mcp remove <name> in the CLI. See Slash commands.

Related

• Configuration
• Tools
• Troubleshooting — MCP tools missing