The same server, started once or ten times.
Larkspur Cloud’s handbook sits behind one stdio MCP server with a retrieve(query, n) tool. A LangGraph agent asks it questions through langchain-mcp-adapters. Pick how the client holds its session, how many questions the user asks and how many retrieval calls the model makes per question. The ledger shows every server process and the JSON-RPC messages it carried.
- Server starts
- Messages
- Setup messages
- Bytes on the wire
Server processes
| Process | Started for, then the client’s messages | Msgs | Bytes |
|---|---|---|---|
| All processes | |||
Recorded with mcp 1.30.0, fastmcp 3.4.11, langchain-mcp-adapters 0.3.2 and LangGraph 1.2.18, through a tap that logs each line on the server’s stdin and stdout. Messages count both directions; bytes are the JSON lines without their newline. The model is scripted, so every run makes exactly the tool calls you set.