Asynchronous 1-to-1 postcard messaging between local AI agent sessions via a Git-backed ledger. Ships as a Python CLI and a Claude Code plugin.
1 file for Claude Code: Postcard CLAUDE.md — 1,105 tokens loaded in every session.
CLAUDE.md A 1,105 tok These files are Open-Agent-Tools/Postcard's own configuration — they tell Claude Code how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.