Cache metrics
What the scanner materializes per session, and what every downstream lens queries.
These fields are computed once by the scanner and stored in the derived cache. Anything not listed here is read from the source at request time or not collected at all.
Canonical source ↗What gets measured per session
Materialized by the scanner into the derived cache, and queried by everything downstream.
Tokens
- input
- output
- reasoning
- cache read
- total per session and per message
Tool activity
- tool call counts
- tool error rate
- per-tool error classes
- duration p95 where sampled
Patch outcomes
- apply_patch_ok
- apply_patch_total
- patch_count
- summary_additions
- patch precision
Context
- compaction count
- part counts
- finish reasons
- truncation detection
Time
- latency
- active_min — gap-clustered working time
- activity bursts
- total elapsed
Topology
- is_subagent
- delegation depth
- parent session
- descendant counts
- CSV flags