Openharness

A local MCP server that lets AI coding agents find each other's recent session files so one agent can reference another's work.

What you can do

List recent session paths and metadata for all supported agents, filtered by project path, with format and update time, and whether the match came from a directory name, a workspace field or a path hash. Look up the most recent session path for one named agent, returning null when none is found. Supported agents are Claude Code, Codex CLI and Gemini CLI. It only returns paths and metadata; the calling agent reads the session files itself.

When to use it

Useful when you run several coding agents on the same project and want one to review or build on what another recently did, for example asking Codex to review Claude Code's latest session. Not needed if you use a single agent or do not want agents reading each other's local session files.

Requirements

Runs as a local process installed from the npm package, so Node.js and npm are needed. Each agent must be able to read local files directly. Setup registers the server in each agent's config, either through the init command or by adding a manual MCP entry. No accounts, API keys or environment variables are declared.