Tool / A hook runs before every edit and asks a server whether another agent changed that file; the agent gets one of five graded advisories (active collision, stale read, parallel edit on another branch, recent edit, nearby edit) costing ~200 tokens, suppressed for ten minutes per file; strict mode blocks the edit until the agent writes a one-line reason naming the teammate's change. Fails open after 1500 ms. Only paths, branch names and change shape leave the machine.
agentmash
A pre-edit hook that tells a Claude Code or Codex agent when a teammate's agent has just changed the file it is about to edit.
The summary describes what the project says it does; inclusion is not an endorsement.
Notable as an advisory, cross-vendor, cross-human layer rather than a lock: it keeps agents unblocked and puts the cost on the contested file only. Its own docs concede the limits: with solo login your own two agents never warn each other, and a warning is muted for ten minutes so the next change can slip by. Closed beta, vendor claims (160 ms local latency) unverified. Described in the 'Two agents, one file' article.
- Coordinate
AI-drafted