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["Always evaluate all 5 dimensions before computing composite score","Cite specific evidence from the output being evaluated for each dimension score","Use the weighted composite (not simple average) for final verdict","Pair with verification-before-completion for pre-completion quality gates","Document evaluation verdicts in task metadata for traceability"]
error_handling
graceful
streaming
supported
source
builtin
trust_score
100
provenance_sha
cd4fd70eeb53b06c
Agent Evaluation
Overview
LLM-as-judge evaluation framework that scores AI-generated content on 5 dimensions using a 1-5 rubric. Agents evaluate outputs, compute a weighted composite score, and emit a structured verdict with evidence citations.
Core principle: Systematic quality verification before claiming completion. Agent-studio currently has no way to verify agent output quality — this skill fills that gap.
When to Use
Always:
Before marking a task complete (pair with verification-before-completion)
After a plan is generated (evaluate plan quality)
After code review outputs (evaluate review quality)
During reflection cycles (evaluate agent responses)
When comparing multiple agent outputs
Don't Use:
For binary pass/fail checks (use verification-before-completion instead)
For security audits (use security-architect skill)
For syntax/lint checking (use pnpm lint:fix)
The 5-Dimension Rubric
Every evaluation scores all 5 dimensions on a 1-5 scale:
Dimension
Weight
What It Measures
Accuracy
30%
Factual correctness; no hallucinations; claims are verifiable
Groundedness
25%
Claims are supported by citations, file references, or evidence from the codebase
Coherence
15%
Logical flow; internally consistent; no contradictions
Completeness
20%
All required aspects addressed; no critical gaps
Helpfulness
10%
Actionable; provides concrete next steps; reduces ambiguity
Scoring Scale (1-5)
Score
Meaning
5
Excellent — fully meets the dimension's criteria with no gaps
4
Good — meets criteria with minor gaps
3
Adequate — partially meets criteria; some gaps present
2
Poor — significant gaps or errors in this dimension
Evidence: Direct quote or file reference from the evaluated output
Rationale: Why this score was given (1-2 sentences)
Dimension 1: Accuracy
Checklist:
- [ ] Claims are factually correct (verify against codebase if possible)
- [ ] No hallucinated file paths, function names, or API calls
- [ ] Numbers and counts are accurate
- [ ] No contradictions with existing documentation
Dimension 2: Groundedness
Checklist:
- [ ] Claims cite specific files, line numbers, or task IDs
- [ ] Recommendations reference observable evidence
- [ ] No unsupported assertions ("this is probably X")
- [ ] Code examples use actual project patterns
Dimension 3: Coherence
Checklist:
- [ ] Logical flow from problem → analysis → recommendation
- [ ] No internal contradictions
- [ ] Terminology is consistent throughout
- [ ] Steps are in a rational order
Dimension 4: Completeness
Checklist:
- [ ] All required aspects of the task are addressed
- [ ] Edge cases are mentioned (if relevant)
- [ ] No critical gaps that would block action
- [ ] Follow-up steps are included
Dimension 5: Helpfulness
Checklist:
- [ ] Provides actionable next steps (not just observations)
- [ ] Concrete enough to act on without further clarification
- [ ] Reduces ambiguity rather than adding it
- [ ] Appropriate for the intended audience
// Load plan documentRead({ file_path: '.claude/context/plans/auth-design-plan-2026-02-21.md' });
// Evaluate against 5-dimension rubricSkill({ skill: 'agent-evaluation' });
// Provide the plan content as the output to evaluate
Evaluate Agent Response Before Completion
// Agent generates implementation summary// Before marking task complete, evaluate the summary qualitySkill({ skill: 'agent-evaluation' });
// If composite < 3.5, request improvements before TaskUpdate(completed)
Evaluate Code Review Output
// After code-reviewer runs, evaluate the review qualitySkill({ skill: 'agent-evaluation' });
// Ensures review is grounded in actual code evidence, not assertions
Batch Evaluation (comparing two outputs)
// Evaluate output A// Save verdict A// Evaluate output B// Save verdict B// Compare composites → choose higher scoring output
Integration with Verification-Before-Completion
The recommended quality gate pattern:
// Step 1: Do the work// Step 2: Evaluate with agent-evaluationSkill({ skill: 'agent-evaluation' });
// If verdict is POOR or FAILING → rework before proceeding// If verdict is ADEQUATE or better → proceed to verification// Step 3: Final gateSkill({ skill: 'verification-before-completion' });
// Step 4: Mark completeTaskUpdate({ taskId: 'X', status: 'completed' });
Iron Laws
NO COMPLETION CLAIM WITHOUT EVALUATION EVIDENCE — If composite score < 2.5 (POOR or FAILING), rework the output before marking any task complete.
ALWAYS score all 5 dimensions — never skip dimensions to save time; each dimension catches different failure modes (accuracy ≠ completeness ≠ groundedness).
ALWAYS cite specific evidence for every dimension score — "Evidence: [file:line or direct quote]" is mandatory, not optional. Assertions without grounding are invalid.
ALWAYS use the weighted composite — accuracy×0.30 + groundedness×0.25 + completeness×0.20 + coherence×0.15 + helpfulness×0.10. Never use simple average.
NEVER evaluate before the work is complete — evaluating incomplete outputs produces falsely low scores and wastes context budget.
Anti-Patterns
Anti-Pattern
Why It Fails
Correct Approach
Skipping dimensions to save time
Each dimension catches different failures
Always score all 5 dimensions
No evidence citation per dimension
Assertions without grounding are invalid
Quote specific text or file:line for every score
Using simple average for composite
Accuracy (30%) matters more than helpfulness (10%)
Use the weighted composite formula
Only checking EXCELLENT vs FAILING
ADEQUATE outputs need targeted improvements, not full rework
Use all 5 verdict tiers with appropriate action per tier
Evaluating before work is done
Incomplete outputs score falsely low
Evaluate completed outputs only
Treating evaluation as binary gate
Quality is a spectrum; binary pass/fail loses nuance
Use composite score + per-dimension breakdown together
Assigned Agents
This skill is used by:
qa — Primary: validates test outputs and QA reports before completion
