diff --git a/.worktreeinclude b/.worktreeinclude
new file mode 100644
index 0000000..ccf0f47
--- /dev/null
+++ b/.worktreeinclude
@@ -0,0 +1,13 @@
+# Files to copy into claude worktrees
+# Only gitignored files matching these patterns are copied.
+# See: https://docs.anthropic.com/en/docs/claude-code/common-workflows#copy-gitignored-files-to-worktrees
+
+# Environment files
+.env
+.env.local
+.env.*.local
+.env.*
+
+# Installed dependency directories
+node_modules/
+vendor/