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T02: ADR-0003 — transcript as instrument, commit intervals as attribution

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Instrument: session transcript JSONL, deduped by requestId, priced per
model and per cache TTL. Hub rejected as a source (no cache fields, ~100%
error on the same work), kept as sink. Status bar and billing API
rejected on availability.

Attribution: (prev_commit, this_commit] ending-at-commit, scoped by
sessionId. Explicit session markers rejected because they depend on an
agent remembering a step — the exact failure this workplan exists to fix.
Hub status transitions rejected as an after-the-fact time index.

Stated honestly: we buy accuracy with specification complexity, and D1
gets worse. That trade is only right because the alternative on offer was
not a simpler correct number but one wrong by two orders of magnitude.

Seven failure modes recorded up front, each becoming a T04 test — most
importantly that dedup fails in the under-reporting direction, so the
invariant is asserted at runtime rather than trusted.

Gate satisfied: T04 may now write collector code.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
tegwick 2026-07-31 08:44:27 +02:00
parent ac3ac2a8ce
commit c3e6e72ab2
2 changed files with 119 additions and 1 deletions
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workplans/CB-WP-0002-cost-accounting.md
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@ -87,7 +87,7 @@ accuracy and the hub to lead on durability.
```task
id: CB-WP-0002-T02
status: todo
status: done
priority: high
state_hub_task_id: "eae248ab-f29f-4f11-9d20-e8145b0d822d"
```