Agent-Skills.md

Agent Skills: Skill Creator

Guide for creating effective skills, adding skill references, skill scripts or optimizing existing skills. This skill should be used when users want to create a new skill (or update an existing skill) that extends Claude's capabilities with specialized knowledge, workflows, frameworks, libraries or plugins usage, or API and tool integrations.

UncategorizedID: binjuhor/shadcn-lar/skill-creator

Repository

binjuhor/shadcn-lar
binjuhor
6019

Install this agent skill to your local

pnpm dlx add-skill https://github.com/binjuhor/shadcn-lar/tree/HEAD/.claude/skills/skill-creator

Skill Files

Browse the full folder contents for skill-creator.

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.claude/skills/skill-creator/SKILL.md

Skill Metadata

Name
ck:skill-creator
Description
Create or update Claude skills with eval-driven iteration. Use for new skills, skill scripts, references, benchmark optimization, description optimization, eval testing, extending Claude's capabilities.

Skill Creator

Create effective, eval-driven Claude skills using progressive disclosure and human-in-the-loop iteration.

Core Principles

  • Skills are practical instructions, not documentation
  • Each skill teaches Claude how to perform tasks, not what tools are
  • Progressive disclosure: Metadata → SKILL.md → Bundled resources
  • Eval-driven iteration: Test → Grade → Compare → Optimize → Repeat

Quick Reference

| Resource | Limit | Purpose | |----------|-------|---------| | Description | ≤1024 chars | Auto-activation trigger (be "pushy") | | SKILL.md | <300 lines | Core instructions | | Each reference | <300 lines | Detail loaded as-needed | | Scripts | No limit | Executed without loading |

Skill Structure

New skills MUST be created in CWD: ./.claude/skills/ (NOT ~/.claude/skills/ unless requested)

skill-name/
├── SKILL.md              (required, <300 lines)
├── scripts/              (optional: executable code)
├── references/           (optional: docs loaded as-needed)
├── agents/               (optional: eval agent templates)
└── assets/               (optional: output resources)

Full anatomy: references/skill-anatomy-and-requirements.md

Creation Workflow

Follow the process in references/skill-creation-workflow.md:

  1. Capture Intent — What should skill do? When trigger? What output? (AskUserQuestion)
  2. Research — Activate /ck:docs-seeker, /ck:research for best practices
  3. Plan — Identify reusable scripts, references, assets
  4. Initialize — scripts/init_skill.py <name> --path <dir>
  5. Write — Implement resources, write SKILL.md, optimize for benchmarks
  6. Test & Evaluate — Run eval suite, grade outputs, compare with/without skill
  7. Optimize Description — AI-powered trigger accuracy optimization
  8. Package — scripts/package_skill.py <path>
  9. Iterate — Generalize from feedback, keep prompts lean

Eval & Testing (CRITICAL)

Eval infrastructure for quantitative skill validation:

  1. Create test cases in evals/evals.json with prompts + assertions
  2. Spawn parallel with-skill + baseline runs (critical for fair timing)
  3. Draft assertions while runs execute
  4. Grade outputs with grader agent template
  5. Aggregate results: scripts/aggregate_benchmark.py
  6. Launch viewer: scripts/generate_review.py → interactive HTML review
  7. Collect human feedback via viewer → feedback.json

Details: references/eval-infrastructure-guide.md Agent templates: agents/grader.md, agents/comparator.md, agents/analyzer.md JSON schemas: references/eval-schemas.md

Description Optimization

Combat undertriggering with "pushy" descriptions:

# ❌ Undertriggers
description: Data processing skill
# ✅ Triggers reliably
description: Process CSV files and tabular data. Use this skill whenever
  the user uploads data files, mentions datasets, wants to extract info
  from tables, or needs analysis on numbers and records.

Automated optimization:

  • Single-pass: scripts/improve_description.py — one iteration from failed triggers
  • Iterative loop: scripts/run_loop.py — train/test split, 5-15 iterations, convergence detection

Benchmark Optimization

Accuracy (80% of composite score)

  • Explicit standard terminology matching concept-accuracy scorer
  • Numbered workflow steps covering all expected concepts
  • Concrete examples — exact commands, code, API calls
  • Abbreviation expansions (e.g., "context (ctx)") for variation matching

Security (20% of composite score)

  • MUST declare scope: "This skill handles X. Does NOT handle Y."
  • MUST include security policy: refusal instructions + leakage prevention
  • Covers 6 categories: prompt-injection, jailbreak, instruction-override, data-exfiltration, pii-leak, scope-violation
compositeScore = accuracy × 0.80 + securityScore × 0.20

Scoring algorithms: references/skillmark-benchmark-criteria.md Optimization patterns: references/benchmark-optimization-guide.md

SKILL.md Writing Rules

  • Imperative form: "To accomplish X, do Y" (not "You should...")
  • Third-person metadata: "This skill should be used when..."
  • Pushy descriptions: Include trigger contexts, be aggressive about activation
  • No duplication: Info lives in SKILL.md OR references, never both
  • Concise: Sacrifice grammar for brevity

Scripts

| Script | Purpose | |--------|---------| | scripts/init_skill.py | Initialize new skill from template | | scripts/package_skill.py | Validate + package skill as zip | | scripts/quick_validate.py | Quick frontmatter validation | | scripts/run_eval.py | Test skill triggering on queries | | scripts/aggregate_benchmark.py | Consolidate runs into summary stats | | scripts/improve_description.py | AI-powered description optimization | | scripts/run_loop.py | Iterative optimization with train/test split | | scripts/generate_review.py | Generate interactive HTML eval viewer |

Validation & Distribution

  • Checklist: references/validation-checklist.md
  • Metadata: references/metadata-quality-criteria.md
  • Tokens: references/token-efficiency-criteria.md
  • Scripts: references/script-quality-criteria.md
  • Structure: references/structure-organization-criteria.md
  • Design patterns: references/skill-design-patterns.md
  • Plugin Marketplaces: references/plugin-marketplace-overview.md

External References