diff --git a/vite.config.ts b/vite.config.ts
index 5bc4af7..56212c8 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -14,7 +14,12 @@ export default defineConfig({
       '**/cypress/**',
       '**/.{idea,git,cache,output,temp}/**',
       '**/{karma,rollup,webpack,vite,vitest,jest,ava,babel,nyc,cypress,tsup,build}.config.*',
-      'supabase/functions/**',
+      '**/supabase/functions/**',
+      // Git worktrees for in-progress branches live nested under .claude/worktrees/
+      // in this project's dev setup — without this, running vitest from the main
+      // checkout also picks up each worktree's full copy of src/, duplicating
+      // every test (and, for worktrees mid-migration, potentially failing ones).
+      '**/.claude/worktrees/**',
     ],
   },
 })