Tool / Advisory leases
MCP Agent Mail
Agents get identities and threaded inboxes, take TTL leases on file globs, and an optional pre-commit hook blocks commits that touch files another agent has reserved.
The summary describes what the project says it does; inclusion is not an endorsement.
The README says: "File reservations are advisory leases, not hard locks." The commit guard is opt-in and agents can override it. A Rust rewrite of the original Python project.