Streams ~/.claude/projects/**/*.jsonl once, filters to turns attributed to the
target plugin (attributionPlugin / attributionSkill / attributionAgent),
de-duplicates by (message.id, requestId) taking max on every usage field, and
computes the spec.md §5.2 dynamic signals: MTR, offload_waste, recurring
tool-signature n-grams, read amplification, retry density, judgment density,
fan-out multiplier, and the composite offload_value — plus the FR-3.4
attribution-coverage headline.
Token and cost arithmetic is taken from token-budget's cc-tokens, never
reimplemented. It is imported as a module rather than shelled out with --json,
because cc-tokens' subcommands aggregate by day/session/project/model and none
can answer "weighted tokens for this set of turns" — the attribution fields are
not on its CLI surface. Its Rec.cost / Rec.weighted still compute every number
here, so the pricing table and cache multipliers keep exactly one home.
Two deviations from design/plan.md §4.1, both because the transcripts say
otherwise: agents attribute via attributionAgent on the subagent sidechain
files, not agentName (which is a separate `type: "agent-name"` line mapping a
session to a display label); and attributionSkill is sometimes bare rather than
plugin-qualified, so it is normalized.
Tool arguments are masked to <path>/<n>/<sha>/<url>/<str> before entering any
emitted structure, and Bash commands are reduced to bare executable words —
FR-3.5, asserted in the suite. Fixtures are synthetic by construction; no real
transcript content is in this repo.
Real-history check: 30-day window over a 1.7 GB history, 94s wall, 29 MB peak
RSS, one process.
Oleks
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