Every session has a price on the wire.
Two Larkspur MCP servers, handbook and status, driven through mcp 1.30.0 and langchain-mcp-adapters 0.3.2. Pick a transport and a client, then move the number of tool calls. Every row and count below was recorded from a real run; nothing is simulated.
- Processes the client started
- Sessions opened
- JSON-RPC messages
- HTTP requests
Every message in this run
| # | Server | Message | Carried by | Reply |
|---|
| # | Server | Message | Carried by | Reply |
|---|
All eight setups at this many calls
| Transport | Client | Processes | Sessions | Messages | HTTP |
|---|
Recorded twice on fresh servers; both runs gave the same rows for all 64 settings. Parallel requests during setup can arrive in a different order from run to run.