docs: add authoring agent instructions guide

[Paveltarno]

Note

Description

This PR adds a new topic guide, docs/authoring-agent-instructions.md, covering best practices for writing Claude Code skills, CLAUDE.md project instructions, AGENTS.md files, and subagent definitions. The guide emphasizes token efficiency and progressive disclosure as core principles. A corresponding entry is added to docs/AGENTS.md to register the new guide in the project's topic index.

Related Issue

None

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Other (please describe):

Changes Made

• Added docs/authoring-agent-instructions.md — new topic guide covering:
  • CLAUDE.md structure, what to include/exclude, and anti-patterns
  • Skill authoring (SKILL.md): frontmatter fields, body guidelines, progressive disclosure levels, bundled resource directory conventions, and description examples
  • Subagent definitions (.claude/agents/): format and a skills-vs-subagents comparison table
  • Pre-ship checklist for any instruction file
• Updated docs/AGENTS.md to add the new guide to the topic guide index

Testing

• I have tested these changes locally
• I have added/updated tests as needed
• All tests pass (npm test)

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• I have updated docs/ (AGENTS.md) if I made architectural changes

Additional Notes

None

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_{🤖 Generated by Claude | 2026-02-22 00:00 UTC}

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