Create docs/writing-agents.md with comprehensive documentation for
writing new agents:
- File structure and naming conventions (agents/<name>/AGENT.md)
- How agents combine multiple skills into focused personas
- Use cases: parallel processing, context isolation, complex workflows,
autonomous exploration
- When to use agents vs direct skill invocation with decision matrix
- Annotated walkthrough of product-manager agent
- Best practices for skill selection, boundaries, and guardrails
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>