diff --git a/src/entrypoints/cli.tsx b/src/entrypoints/cli.tsx
index a6e7a58ad..50dcb38e1 100644
--- a/src/entrypoints/cli.tsx
+++ b/src/entrypoints/cli.tsx
@@ -314,15 +314,6 @@ async function main(): Promise<void> {
     process.exit(0);
   }
 
-  // Fast-path for `claude environment-runner`: headless BYOC runner.
-  // feature() must stay inline for build-time dead code elimination.
-  if (feature('BYOC_ENVIRONMENT_RUNNER') && args[0] === 'environment-runner') {
-    profileCheckpoint('cli_environment_runner_path');
-    const { environmentRunnerMain } = await import('../environment-runner/main.js');
-    await environmentRunnerMain(args.slice(1));
-    return;
-  }
-
   // Fast-path for --worktree --tmux: exec into tmux before loading full CLI
   const hasTmuxFlag = args.includes('--tmux') || args.includes('--tmux=classic');
   if (
diff --git a/src/environment-runner/main.ts b/src/environment-runner/main.ts
deleted file mode 100644
index 43a89b481..000000000
--- a/src/environment-runner/main.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-// Auto-generated stub — replace with real implementation
-export {}
-export const environmentRunnerMain: (args: string[]) => Promise<void> = () =>
-  Promise.resolve()