What problem does it solve? When multiple AI agent sessions work on the same repository concurrently, they can silently collide on shared files, duplicate work, or overwrite each other's changes. This Skill provides a liveness bus where sessions declare their working set, check for file overlaps before editing, and leave TTL-bound messages for other sessions. ## Core Features & Use Cases - Session Declaration: Declare your intent and dirty file list in a sessions/<id>.md file whose mtime acts as a heartbeat, with automatic staleness detection and garbage collection. - Collision Detection: Scan live session declarations before editing hot files to spot overlapping working sets and coordinate instead of racing. - Inter-Session Messaging: Leave immutable, TTL-expiring messages under your own writer directory for present or future sessions, with strict one-writer-per-file rules. - Use Case: Before refactoring a shared module, you check the coordination space, find another session mid-carve on the same file, and leave a message sequencing your change after theirs instead of causing a merge conflict. ## Quick Start Check the coordination bus for live sessions and file overlaps, then declare my working set before I start editing shared files.