# Code Review — TP-080 Step 3

Verdict: **APPROVE**

The Step 3 change adds focused table-driven coverage for the curve sibling tools without changing production behavior. The new tests exercise terse-by-default responses, `include_full`, missing-bucket metadata, duration vs distance bucket axes, HR/power/pace value fields, and pace preferred-unit fallback behavior.

## Findings

No blocking findings.

## Notes

- The shared fake client remains in-process and deterministic; the added tests do not introduce network access.
- Pace unit coverage verifies metric, imperial, and unknown-unit fallback via both the emitted preferred pace field and `_meta.units.system`.
- A future small hardening improvement would be to also assert that pace responses preserve `elapsed_seconds` and omit the non-preferred pace field, but the current implementation already does this and the added tests cover the required Step 3 behavior.

## Verification run

- `git diff ca7a874f5e6160c9515f809702f24831dcf34383..HEAD --name-only`
- `git diff ca7a874f5e6160c9515f809702f24831dcf34383..HEAD`
- `go test ./internal/tools ./internal/intervals ./internal/toolcatalog ./internal/toolchecks ./internal/safety` — pass
- `go run ./scripts/check_schema_stability.go -baseline-dir internal/tools/schema_snapshot -require-baseline` — pass
- `git diff --check ca7a874f5e6160c9515f809702f24831dcf34383..HEAD` — pass
