Closes the measurement gap flagged by the ship-quality review: "zero
tests exercise Opus 4.7 behavior; every skill-e2e hardcodes 4.6."
Two cases, both pinned to claude-opus-4-7:
1. Fanout rate (A/B)
- Arm A: regen SKILL.md with --model opus-4-7 (overlay ON, includes
"Fan out explicitly" nudge).
- Arm B: regen SKILL.md with --model claude (overlay OFF, only
model-agnostic nudges).
- Prompt: "Read alpha.txt, beta.txt, gamma.txt. These are independent."
- Measure: parallel tool calls in first assistant turn.
- Assert: arm A >= arm B.
2. Routing precision (6-case mini-benchmark)
- 3 positive prompts that should route (wtf bug, send it, does it work)
- 3 negative prompts that match keywords but should NOT route
(syntax question, algorithm question, slack message)
- Assert: TP rate >= 66%, FP rate <= 33%.
Cost estimate: ~$3-5 per full run. Classified as periodic tier per
CLAUDE.md convention (Opus model, non-deterministic). Runs only with
EVALS=1 env var, touchfile-gated so unrelated diffs don't trigger it.
Test plan artifact at
~/.gstack/projects/garrytan-gstack/garrytan-feat-opus-4.7-migration-eng-review-test-plan-20260421-230611.md
tracks the full specification.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Garry Tan
7e90b0f092