Module pace 

The service pace registry behind a catalog entry’s rate:: one process-global map, seeded at the from_spec chokepoint — the ONLY place every process (reactor, turn worker, flat subagent) constructs its MCP clients — so a rated catalog entry paces its consumers wherever the call actually executes. Buckets are keyed by SERVICE name rather than by server, so every server referencing one entry shares a single bucket per process.

Functions

register

Called from from_spec for a spec carrying a catalog rate.

take

Spend one token toward server’s service, if it is rated. Ok(()) when unrated or a token was available; Err(msg) (a refusal the caller reports as a tool error, never a crash) when the bucket is dry.