Hacker News discussion: Show HN: A file-based protocol for two AI agents to talk until they agree

A developer introduced a file-based protocol that lets two AI agents collaboratively edit a single Markdown document, turn by turn, until they reach explicit consensus. The system uses only a local file with a fixed header format and four rules (single writer, atomic writes, no chat log), so it requires no server or framework. The conversation becomes the final deliverable rather than a growing transcript, and it works across different models and CLI tools. The creator reports it is already used for production handoffs and for settling disagreements between agents—citing an example where Codex and Claude argued about a branch. The npm-installable skill is MIT licensed and the demo replays a real session planning the project’s own website. The core novelty is forcing convergence into one document instead of accumulating chat history, which makes the output immediately usable without scrolling through debate logs. The summary is strictly derived from the supplied article without added facts or speculation.