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.ag files (or .ag.md during the transition) contain prompts written for AI agents. The format is simple:
  • Pseudo-XML tags for semantic structure (not strict XML)
  • Markdown content inside and between tags
  • No attributes on tags
  • Flexible whitespace—inline or block tags, as author intends

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Example

quarterly-report.ag
You're a financial analyst at AcmeCorp. Generate a Q2 report.

<context>
AcmeCorp is a B2B SaaS company. Our investors value transparency.
</context>

<instructions>
1. Include sections: Revenue Growth, Profit Margins, Cash Flow
2. Highlight strengths and areas for improvement
</instructions>

Use this data:
<data>{{SPREADSHEET_DATA}}</data>

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Design principles

The format preserves author intent. Tooling validates and lints but does not reformat. What you write is what the agent receives.