Lesson 055: Eval harness hardening
Focus
Bias toward observable metrics: latency, cost, escalation rate. Token Eval harness hardening:55 keeps neighbouring lessons differentiable.
Key ideas
- Thread: Eval harness hardening · drill v5 · spin
318352. - Habit: attach a trace_id to every completion you would paste into an ops dashboard.
- Guardrail: add one RACI bullet for prompt or index changes before tomorrow's standup.
Deep dive notebook
Synthetic drill artefacts
Token CFO scratchpad
- prompt_budget: 2039
- completion_budget: 680
- cache_key: `6c04`
Hypothesis: halving completions moves P95 ~8% — record actuals.
Practice
Practice Draft three eval assertions QA must pass before prompt promotion. — 55 Bump 12.