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Kyle Carberry
0f86c4237e
Coder's chat (chatd) can now discover and use MCP servers configured in a workspace's `.mcp.json` file. This brings project-specific tooling (GitHub, databases, docs servers, etc.) into the chat without any manual configuration. ## How it works The workspace agent reads `.mcp.json` from the workspace directory (same format Claude Code uses), connects to the declared MCP servers — spawning child processes for stdio servers and connecting over the network for HTTP/SSE — and caches their tool lists. Two new agent HTTP endpoints expose this: - `GET /api/v0/mcp/tools` returns the cached tool list (supports `?refresh=true`) - `POST /api/v0/mcp/call-tool` proxies calls to the correct server On each chat turn, chatd calls `ListMCPTools` through the existing `AgentConn` tailnet connection, wraps each tool as a `fantasy.AgentTool`, and adds them to the LLM's tool set alongside built-in and admin-configured MCP tools. Tool names are prefixed with the server name (`github__create_issue`) to avoid collisions. Failed server connections are logged and skipped — they never block the agent or break the chat. Child stdio processes are terminated on agent shutdown.