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Vibe Drop Β· interactive gift

Build your eval stack before your agent's failures get load-bearing.

Only ~52% of teams run offline evals. The gap between observability and judgment is where production agents die.

Built on "AI Agent Evaluation & Quality Measurement" β€” part 8 of the "AI Agent Systems in Production" series on aicry (anonymously authored; attributed to the publication). Figures are from the piece.

Feel it: the pass^k drop

pass@k is what demos report. pass^k is what users experience. Drag your single-run success rate and watch eight perfect runs evaporate.

Probability all 8 runs succeed
5.8%
"Every demo implicitly uses pass@k: run until success, present that run. Investors and prospects see the winner."

Production target for mission-critical flows: pass^8 β‰₯ 80%. Ο„-bench: GPT-4o-class agents under 50% pass@1 on retail tasks, falling below 25% at pass^8.

The three-layer pyramid

Run all three simultaneously β€” each misses at least two failure categories alone. Tap a layer.

Layer 1 Β· Unit-Step

Why did it fail?

Isolated decisions: right tool? valid params? correct interpretation? Graders are code-based β€” string matching, schema validation, API response checks, tool-call argument validation. Fast, objective, brittle.
Layer 2 Β· Trajectory

Where in the chain did it fail?

Full sequence of reasoning steps, tool calls, states, retries. Graders: LLM-as-judge per step, expected-tool-sequence matching, step-efficiency checks. Coherence target >0.85 on traces with 4+ steps. Not optional β€” catches corrupt success (27–78% of benchmark "successes" bypass required steps or use unauthorized tools).
Layer 3 Β· End-to-End

Did it fail at all?

Black-box input β†’ success. Graders: code-based output verification (DB state, API responses), model-based rubrics, human review. What leadership sees β€” and what hides everything underneath.

Plan it: your rollout

Two inputs β†’ your week-by-week eval-stack build-out. Check items off as you ship them.

CI gate (from the blueprint): average score β‰₯ 0.85 and pass^8 β‰₯ 0.80 for mission-critical flows. Production: sample 5% of queries daily, alert on 2Οƒ deviation from the rolling baseline.

The eight blind spots

Ranked by frequency/severity. Tap one.

Select a blind spot to see what it is.

Share this eval plan

Replay link β€” anyone who opens it sees your inputs and rollout plan.

Retake with fresh inputs β†’