Harry Bayliss
7b5a22618f
handleConn processed requests serially, so a slow tool (e.g. wait_for_pattern with a 300s timeout) monopolized the single per-agent MCP connection and every queued call timed out behind it. Handle each request in its own goroutine, serialize responses through a per-conn write mutex (full response written atomically, partial writes handled), copy the request line before handing it off (bufio reuses its buffer), and wait on a WaitGroup before closing the conn so in-flight handlers finish cleanly. Greeting stays sequential; notifications still get no response. Resolves the [MCP TIMEOUT] TODO item.