diff --git a/.gitignore b/.gitignore
index ee89d7a..84f723e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,6 +46,17 @@ app.*.map.json
 # AI coding tools
 .ac/
 
+# Worktrees Claude Code creates for parallel sessions and isolated subagents.
+# Only this subdirectory: the rest of `.claude/` is tracked, because the rules
+# under it are part of the repository.
+#
+# They sit inside the working tree rather than beside it. `git clean -xdf` leaves them
+# alone: git's nested-repository guard resolves a gitfile too, so it reports "Skipping
+# repository .claude/worktrees/<slug>" and the contents survive. `git clean -xdff` does
+# not skip them, and wipes a live worktree while `.git/worktrees/<slug>` survives,
+# leaving a registration that `git worktree prune` then has to clear.
+.claude/worktrees/
+
 # Package lock file
 pubspec.lock