phoenix-evals
Build and run evaluators for AI/LLM applications using Phoenix.
Install
mkdir -p .claude/skills/phoenix-evals && curl -L -o skill.zip "https://mcp.directory/api/skills/download/1054" && unzip -o skill.zip -d .claude/skills/phoenix-evals && rm skill.zipInstalls to .claude/skills/phoenix-evals
About this skill
Phoenix Evals
Build evaluators for AI/LLM applications. Code first, LLM for nuance, validate against humans.
Quick Reference
| Task | Files |
|---|---|
| Setup | setup-python, setup-typescript |
| Decide what to evaluate | evaluators-overview |
| Choose a judge model | fundamentals-model-selection |
| Use pre-built evaluators | evaluators-pre-built |
| Build code evaluator | evaluators-code-{python|typescript} |
| Build LLM evaluator | evaluators-llm-{python|typescript}, evaluators-custom-templates |
| Batch evaluate DataFrame | evaluate-dataframe-python |
| Run experiment | experiments-running-{python|typescript} |
| Create dataset | experiments-datasets-{python|typescript} |
| Generate synthetic data | experiments-synthetic-{python|typescript} |
| Validate evaluator accuracy | validation, validation-evaluators-{python|typescript} |
| Sample traces for review | observe-sampling-{python|typescript} |
| Analyze errors | error-analysis, error-analysis-multi-turn, axial-coding |
| RAG evals | evaluators-rag |
| Avoid common mistakes | common-mistakes-python, fundamentals-anti-patterns |
| Production | production-overview, production-guardrails, production-continuous |
Workflows
Starting Fresh:
observe-tracing-setup → error-analysis → axial-coding → evaluators-overview
Building Evaluator:
fundamentals → common-mistakes-python → evaluators-{code\|llm}-{python\|typescript} → validation-evaluators-{python\|typescript}
RAG Systems:
evaluators-rag → evaluators-code-* (retrieval) → evaluators-llm-* (faithfulness)
Production:
production-overview → production-guardrails → production-continuous
Rule Categories
| Prefix | Description |
|---|---|
fundamentals-* | Types, scores, anti-patterns |
observe-* | Tracing, sampling |
error-analysis-* | Finding failures |
axial-coding-* | Categorizing failures |
evaluators-* | Code, LLM, RAG evaluators |
experiments-* | Datasets, running experiments |
validation-* | Validating evaluator accuracy against human labels |
production-* | CI/CD, monitoring |
Key Principles
| Principle | Action |
|---|---|
| Error analysis first | Can't automate what you haven't observed |
| Custom > generic | Build from your failures |
| Code first | Deterministic before LLM |
| Validate judges | >80% TPR/TNR |
| Binary > Likert | Pass/fail, not 1-5 |
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