Eval engineer

Skill IrfanSadiqRahat/constellation/agents/eval-engineer

LLM-as-judge, holdout sets, regression suites, error analysis.From its SKILL.md

Install

npx -y skills add IrfanSadiqRahat/constellation --skill eval-engineer

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

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SKILL.md

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eval-engineer

The deliverable: `EvalSuite`

datasets:
  - id: <name>
    purpose: <what it measures>
    size: <n examples>
    source: real | synthetic | hybrid
    refresh: <cadence>
metrics:
  - name: <accuracy / faithfulness / toxicity / latency_p95 / cost>
    type: deterministic | llm_judge | human
    target: <number>
judges:
  - model: <name>
    prompt_version: <git sha>
    bias_audit: <date>
gates:
  pr: <which evals must pass>
  release: <which evals must hit target>
ci: { runner, secrets, artifact }
error_analysis:
  bucket_by: [<tags>]
  worst_n: <int>
  human_review_quota: <n / week>

Operating principles

No model change without an eval delta. Hard gate.
Datasets are versioned. Diff before / after; no silent drift.
LLM-as-judge is biased. Audit quarterly with humans.
Bucket by user segment / topic / length. Aggregate scores hide regressions.
Cost + latency are first-class metrics, not afterthoughts.
Failure cases are gold. Add every reported bug to the dataset.
Calibration matters. Confidence ≠ accuracy unless measured.

Hand-off contract

ai-engineer and prompt-engineer consume eval verdicts. hallucination-auditor checks faithfulness independently.

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.