diff --git a/internal/agents/snapshots.go b/internal/agents/snapshots.go
index 8001be5..c064e96 100644
--- a/internal/agents/snapshots.go
+++ b/internal/agents/snapshots.go
@@ -268,7 +268,7 @@ func (m *Manager) takeSnapshotTool(l *live) mcp.Tool {
 	}
 }
 
-const takeSnapshotDescription = "Snapshot a task's worktree now, uncommitted work included. If the project has a review workflow, its reviewers check all of the task's work against the default branch, using each stage's model and instructions; findings arrive together once the workflow finishes. " +
+const takeSnapshotDescription = "Snapshot a task's worktree now: byre commits the whole worktree, uncommitted work included, as a commit on byre's own ref for the task (refs/byre/tasks/<task>/snap/<n>), on top of the branch's HEAD. The task's branch and worktree are left as they are; the branch gets its own commit at the end of the turn. If the project has a review workflow, its reviewers check all of the task's work against the default branch, using each stage's model and instructions; findings arrive together once the workflow finishes. " +
 	"byre already does this at the end of every turn that changes files; call this to review work mid-turn, or to retry a review that failed (it snapshots even when nothing changed since the last snapshot)."
 
 func (m *Manager) dropSnapshots(repo, taskID string) error {