diff --git a/.claude/skills/worktree-update/SKILL.md b/.claude/skills/worktree-update/SKILL.md
index 403b2e1c3..d0a676748 100644
--- a/.claude/skills/worktree-update/SKILL.md
+++ b/.claude/skills/worktree-update/SKILL.md
@@ -44,10 +44,16 @@ Branch determines the mode: `main` → outbound sync, anything else → inbound
 git fetch --all
 ```
 
+Discover all worktree branches (excluding `main` itself):
+
+```bash
+git worktree list | grep -v '\[main\]' | sed 's/.*\[//;s/\]//'
+```
+
 For each worktree branch, check if it has commits ahead of main:
 
 ```bash
-git rev-list --count main..<branch>
+git rev-list --count main..origin/<branch>
 ```
 
 Skip branches with 0 commits ahead. For branches that ARE ahead, collect: