Get Mcp Schema Usage

Tool-call volume by referenced source schema, and how sessions move between schemas.

The schema comes straight from the logged tool arguments: the scalar schema argument (run_sql, get_series, search_series, describe_dataset) plus the schemas array on search_datasets. Sessions reuse the 5-minute-gap bucketing from /admin/mcp/usage over ALL calls (retired tool names included, so totalSessions matches that endpoint's approxSessions); within a session, consecutive references to the same schema collapse into one step, and the resulting per-session schema sequence yields starting schemas, schema-to-schema transitions, distinct-schema depth, and the most common journey paths. Retired tool names (always ok=false) are excluded from the schema references themselves so stale-client traffic doesn't distort per-schema success rates.