secondsky__claude-skills/docs/reference/STANDARDS_COMPARISON.md

Official Anthropic Standards vs Our Approach

Last Updated: 2025-10-21 Official Source: https://github.com/anthropics/skills Spec Version: 1.0 (2025-10-16)

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TL;DR

✅ We are 100% compliant with official Anthropic Agent Skills Spec ✅ We exceed minimum requirements for better quality ✅ Our additions are compatible and don't break the standard

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Official Requirements (MUST HAVE)

From agent_skills_spec.md

Requirement	Official Spec	Our Approach	Status
SKILL.md file	Required	✅ Required	COMPLIANT
YAML frontmatter	Required	✅ Required	COMPLIANT
name field	Required, lowercase hyphen-case	✅ Required, enforced	COMPLIANT
description field	Required	✅ Required, enhanced	COMPLIANT
Markdown body	No restrictions	✅ Structured with best practices	COMPLIANT

Verdict: ✅ FULLY COMPLIANT

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Optional YAML Fields

From agent_skills_spec.md

Field	Official Spec	Our Approach	Notes
license	Optional	✅ We use MIT	Recommended
allowed-tools	Optional (Claude Code only)	⚠️ Not yet using	Can add when needed
metadata	Optional (key-value map)	⚠️ Not yet using	Can add custom fields

Verdict: ✅ COMPATIBLE - We can add these anytime without breaking anything

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Directory Structure

Official Anthropic Structure (from skill-creator/SKILL.md)

skill-name/
├── SKILL.md (required)
├── scripts/          # Executable code
├── references/       # Documentation to load as needed
└── assets/           # Files used in output

Our Current Structure

skill-name/
├── SKILL.md (required)
├── README.md         # ← OUR ADDITION
├── scripts/          # Official (we add when needed)
├── references/       # Official (we call it reference/ sometimes)
└── assets/           # Official (we call it templates/ sometimes)

Key Differences:

1. README.md: We add this for quick reference - NOT required by spec, fully compatible
2. templates/ vs assets/: We use both names depending on content - both valid

Verdict: ✅ COMPATIBLE - Our additions don't conflict with spec

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Writing Style Guidelines

Official Anthropic Guidance

From skill-creator/SKILL.md:

Guideline	Official	Our Approach	Status
Description style	Third-person ("This skill should be used when...")	✅ Enforced	COMPLIANT
Instruction style	Imperative/infinitive ("To do X, run Y")	✅ Enforced	COMPLIANT
Avoid second person	Don't use "you should"	✅ Enforced	COMPLIANT

Verdict: ✅ FULLY COMPLIANT

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Progressive Disclosure Principle

Official Anthropic Design

From skill-creator/SKILL.md:

1. Metadata (name + description) - Always in context (~100 words)
2. SKILL.md body - When skill triggers (<5k words)
3. Bundled resources - As needed by Claude

Our Approach

1. Metadata (name + description + keywords) - Always in context (~150 words)
   ↑ We add more keywords for better discovery
2. SKILL.md body - When skill triggers (<5k words)
   ✅ Same as official
3. Bundled resources (scripts/references/assets) - As needed
   ✅ Same as official

Verdict: ✅ ENHANCED BUT COMPATIBLE

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What We Add (Beyond Minimum)

1. README.md

Official: Not required Us: Always include

Why: Quick reference for discovery keywords and metrics Impact: Zero (not parsed by Claude Code skill system) Compatibility: ✅ Fully compatible

2. Enhanced Description

Official: "Description of what the skill does and when Claude should use it" Us:

description: |
  What the skill does.

  Use when: specific scenarios

  Keywords: trigger terms

Why: Better auto-discovery Impact: Improves skill matching Compatibility: ✅ Fully compatible (just more detailed)

3. Production Testing Evidence

Official: Not required Us: Document in README and research logs

Why: Quality assurance Impact: None on functionality Compatibility: ✅ Fully compatible

4. Token Efficiency Metrics

Official: Not mentioned Us: Measure and document

Why: Prove value Impact: None on functionality Compatibility: ✅ Fully compatible

5. Known Issues Documentation

Official: Not required Us: Required with GitHub sources

Why: Error prevention Impact: Better skill quality Compatibility: ✅ Fully compatible

Verdict: ✅ ALL ADDITIONS ARE COMPATIBLE

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Where We Differ (And Why It's OK)

Difference #1: Directory Naming

Official: scripts/, references/, assets/ Us: Sometimes use templates/ or reference/ (singular)

Why It's OK:

• SKILL.md is what matters for discovery
• Directory names are for organization only
• We follow official structure when using scripts

Action: Standardize to official names going forward

Difference #2: README.md

Official: Not mentioned Us: Always include

Why It's OK:

• Not parsed by skill system
• Helps humans (GitHub, documentation)
• Zero impact on Claude Code functionality

Action: Keep doing this

Difference #3: Enhanced Frontmatter

Official: Minimal description Us: Detailed description with keywords

Why It's OK:

• Official spec says "description of what it does and when to use it"
• We just provide MORE detail
• Improves discovery accuracy

Action: Keep doing this

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Compliance Checklist

When building a skill, verify against official spec:

• ✅ SKILL.md exists
• ✅ YAML frontmatter present
• ✅ name field: lowercase hyphen-case, matches directory
• ✅ description field: what it does + when to use
• ✅ license field: MIT or reference to LICENSE file
• ✅ Third-person description style
• ✅ Imperative instruction style
• ✅ No "you should" phrasing
• ✅ Resources in scripts/, references/, or assets/

All items checked = ✅ COMPLIANT

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Official Examples We Reference

From https://github.com/anthropics/skills:

1. skill-creator - Meta skill about creating skills
2. template-skill - Minimal example
3. document-skills/ - Complex production skills (PDF, DOCX, XLSX, PPTX)
4. mcp-builder - MCP server generation
5. artifacts-builder - Claude.ai artifacts

Key Takeaways:

• Even official skills vary in structure
• Some use scripts/, others don't
• Quality matters more than perfect uniformity
• SKILL.md frontmatter is the critical piece

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What Changed from Our Original Approach

Before Reading Official Spec

• ❌ Used custom frontmatter fields (version, author, tags)
• ❌ Didn't know about allowed-tools field
• ⚠️ Inconsistent use of templates/ vs assets/
• ⚠️ Didn't emphasize third-person descriptions

After Aligning with Official Spec

• ✅ Removed custom frontmatter fields
• ✅ Documented optional allowed-tools and metadata fields
• ✅ Standardized on scripts/references/assets structure
• ✅ Enforced third-person, imperative style
• ✅ Referenced official examples

Impact: 2 skills needed fixes (cloudflare-workers-ai, cloudflare-vectorize)

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Future Considerations

Potential Official Changes

If Anthropic updates the spec, we need to:

1. Review changes in https://github.com/anthropics/skills
2. Update this comparison document
3. Audit existing skills for compliance
4. Update templates to match new requirements

Potential Additions We Might Make

allowed-tools field:

allowed-tools:
  - bash
  - python

Use when skill frequently uses specific tools

metadata field:

metadata:
  category: "cloudflare"
  difficulty: "intermediate"
  estimated-time: "10-15 minutes"

Use for custom organization

Both are officially supported - we can add anytime

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Summary

Aspect	Official Anthropic	Our Approach	Compatibility
YAML frontmatter	name + description (required)	✅ Same + optional license	✅ COMPLIANT
SKILL.md	Required	✅ Required	✅ COMPLIANT
Directory structure	scripts/references/assets	✅ Following	✅ COMPLIANT
Writing style	Third-person, imperative	✅ Enforced	✅ COMPLIANT
Progressive disclosure	3-level loading	✅ Same	✅ COMPLIANT
README.md	Not mentioned	✅ We add	✅ COMPATIBLE
Token metrics	Not mentioned	✅ We measure	✅ COMPATIBLE
Production testing	Not required	✅ We require	✅ COMPATIBLE

Overall Verdict: ✅ 100% COMPLIANT + ENHANCED

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References

• Agent Skills Spec: https://github.com/anthropics/skills/blob/main/agent_skills_spec.md
• Skill Creator Guide: https://github.com/anthropics/skills/blob/main/skill-creator/SKILL.md
• Official Skills Repo: https://github.com/anthropics/skills
• Claude Code Docs: https://docs.claude.com/en/docs/claude-code/skills
• Our Standards: claude-code-skill-standards.md

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Last Verified: 2025-10-21 Next Review: When Anthropic updates spec or we notice changes Confidence Level: HIGH - Based on official published spec