What problem does it solve? A change made in one SDLC artifact silently invalidates everything built from it and everything it was built from, leaving requirements, specifications, plans, tasks, tests, code, and documentation out of sync. This Skill runs a bidirectional propagation pass over the artifact graph so drift is detected, dependents are updated, and ambiguous conflicts are escalated to humans instead of guessed. ## Core Features & Use Cases - Bidirectional Propagation: Walks the artifact graph downward to rewrite stale dependents and upward to re-check premises, flagging drift for human decision. - Traceability and Orphan Detection: Builds a full traceability matrix from issue to code, classifying findings as orphan upstream, orphan downstream, or broken references with severity levels. - Safe Fix Mode: With --fix, applies mechanical rewrites, bumps revision counters, and regresses stale review verdicts so the forward pipeline resyncs artifacts. - Use Case: After renaming an API endpoint mid-review, run /propagate-changes FEAT-7 --entry code --fix to update docs and test expectations, refresh the PR description, and flag the outdated specification for re-review. ## Quick Start Ask the agent to run /propagate-changes for a feature after a code change, optionally with --fix, to bring all SDLC artifacts back in sync.