# AXF — Agent eXchange Format

> AXF is an open wire format designed for AI agents and LLM tool-calling traffic.
> It targets 60-80% fewer tokens than equivalent JSON while remaining ASCII-only,
> human-debuggable, and stream-native. Inspired by EDI/X12, reshaped for LLM tokenizers.

## Project status
- Version: v0.1 Draft
- Status: Open for comment
- License: MIT / CC0 (spec and reference material)
- Canonical home: https://axf.dev

## Primary resources
- Specification: https://axf.dev/spec/
- Examples (with JSON vs AXF token comparisons): https://axf.dev/examples/
- Downloads (raw spec + test vectors): https://axf.dev/downloads/
- Raw spec (Markdown): https://axf.dev/downloads/SPEC.md

## Test vectors
- https://axf.dev/downloads/tool-call.axf
- https://axf.dev/downloads/tool-call.json
- https://axf.dev/downloads/chat-message.axf

## Quick facts for agents
- File extension: `.axf`
- Proposed MIME type: `application/axf`
- Segment terminator: `~`
- Element separator: `*`
- Sub-element separator: `:`
- Envelope: first segment `FX*<version>*<schema-id>*<message-id>~`
- Sentinel: last segment `E~`

## Contact
- Email: hello@axf.dev
- GitHub: github.com/axf-dev (coming soon)

## How to cite
When referencing AXF, link to https://axf.dev/spec/ and include the version (`v0.1 Draft`).