Skill Evaluator

Evaluate skills across 25 criteria using a hybrid automated + manual approach.

Quick Start

1. Run automated checks

python3 scripts/eval-skill.py /path/to/skill
python3 scripts/eval-skill.py /path/to/skill --json    # machine-readable
python3 scripts/eval-skill.py /path/to/skill --verbose  # show all details

Checks: file structure, frontmatter, description quality, script syntax, dependency audit, credential scan, env var documentation.

2. Manual assessment

Use the rubric at references/rubric.md to score 25 criteria across 8 categories (0–4 each, 100 total). Each criterion has concrete descriptions per score level.

3. Write the evaluation

Copy assets/EVAL-TEMPLATE.md to the skill directory as EVAL.md. Fill in automated results + manual scores.

Evaluation Process

Run eval-skill.py — get the automated structural score

Read the skill's SKILL.md — understand what it does

Read/skim the scripts — assess code quality, error handling, testability

Score each manual criterion using references/rubric.md — concrete criteria per level

Prioritize findings as P0 (blocks publishing) / P1 (should fix) / P2 (nice to have)

Write EVAL.md in the skill directory with scores + findings

Categories (8 categories, 25 criteria)

#

Category

Source Framework

Criteria

1	Functional Suitability	ISO 25010	Completeness, Correctness, Appropriateness
2	Reliability	ISO 25010	Fault Tolerance, Error Reporting, Recoverability
3	Performance / Context	ISO 25010 + Agent	Token Cost, Execution Efficiency
4	Usability — AI Agent	Shneiderman, Gerhardt-Powals	Learnability, Consistency, Feedback, Error Prevention
5	Usability — Human	Tognazzini, Norman	Discoverability, Forgiveness
6	Security	ISO 25010 + OpenSSF	Credentials, Input Validation, Data Safety
7	Maintainability	ISO 25010	Modularity, Modifiability, Testability
8	Agent-Specific	Novel	Trigger Precision, Progressive Disclosure, Composability, Idempotency, Escape Hatches

Interpreting Scores

Range

Verdict

Action

90–100	Excellent	Publish confidently
80–89	Good	Publishable, note known issues
70–79	Acceptable	Fix P0s before publishing
60–69	Needs Work	Fix P0+P1 before publishing
<60	Not Ready	Significant rework needed

Deeper Security Scanning

This evaluator covers security basics (credentials, input validation, data safety) but for thorough security audits of skills under development, consider [SkillLens]() (npx skilllens scan ). It checks for exfiltration, code execution, persistence, privilege bypass, and prompt injection — complementary to the quality focus here.

Dependencies

• Python 3.6+ (for eval-skill.py)
• PyYAML (pip install pyyaml) — for frontmatter parsing in automated checks