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plugins/phoenix/skills/phoenix-evals/references/evaluators-custom-templates.md

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+# Evaluators: Custom Templates
+
+Design LLM judge prompts.
+
+## Complete Template Pattern
+
+```python
+TEMPLATE = """Evaluate faithfulness of the response to the context.
+
+<context>{{context}}</context>
+<response>{{output}}</response>
+
+CRITERIA:
+"faithful" = ALL claims supported by context
+"unfaithful" = ANY claim NOT in context
+
+EXAMPLES:
+Context: "Price is $10" → Response: "It costs $10" → faithful
+Context: "Price is $10" → Response: "About $15" → unfaithful
+
+EDGE CASES:
+- Empty context → cannot_evaluate
+- "I don't know" when appropriate → faithful
+- Partial faithfulness → unfaithful (strict)
+
+Answer (faithful/unfaithful):"""
+```
+
+## Template Structure
+
+1. Task description
+2. Input variables in XML tags
+3. Criteria definitions
+4. Examples (2-4 cases)
+5. Edge cases
+6. Output format
+
+## XML Tags
+
+```
+<question>{{input}}</question>
+<response>{{output}}</response>
+<context>{{context}}</context>
+<reference>{{reference}}</reference>
+```
+
+## Common Mistakes
+
+| Mistake | Fix |
+| ------- | --- |
+| Vague criteria | Define each label exactly |
+| No examples | Include 2-4 cases |
+| Ambiguous format | Specify exact output |
+| No edge cases | Address ambiguity |