# Task ID: 96

**Title:** Implement mcpctl delete stage Command

**Status:** cancelled

**Dependencies:** 79 ✓

**Priority:** low

**Description:** Add CLI command to delete a custom stage file (cannot delete built-ins).

**Details:**

Create `src/cli/src/commands/delete-stage.ts`:

```typescript
import { Command } from 'commander';
import { unlink, access } from 'fs/promises';
import { join } from 'path';
import { listStages } from 'mcplocal/proxymodel/stage-registry';

const STAGES_DIR = join(process.env.HOME ?? '', '.mcpctl', 'stages');

export function registerDeleteStage(program: Command): void {
  program
    .command('delete stage <name>')
    .description('Delete a custom stage')
    .action(async (name: string) => {
      const stages = listStages();
      const stageInfo = stages.find(s => s.name === name);
      
      if (!stageInfo) {
        console.error(`Stage '${name}' not found`);
        process.exit(1);
      }
      
      if (stageInfo.source === 'built-in') {
        console.error(`Cannot delete built-in stage '${name}'`);
        process.exit(1);
      }
      
      const filePath = join(STAGES_DIR, `${name}.ts`);
      await unlink(filePath);
      
      console.log(`Deleted ${filePath}`);
    });
}
```

**Test Strategy:**

CLI test: can delete custom stage, cannot delete built-in stage (error message), deleting non-existent stage shows error.