# Task ID: 92

**Title:** Implement mcpctl describe stage Command

**Status:** cancelled

**Dependencies:** 79 ✓

**Priority:** medium

**Description:** Add CLI command to show detailed information about a specific stage including its source location.

**Details:**

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

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

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

const STAGE_DESCRIPTIONS: Record<string, string> = {
  'passthrough': 'Returns content unchanged. No processing.',
  'paginate': 'Splits large content into pages with navigation.',
  'section-split': 'Splits content on structural boundaries (headers, JSON keys, etc.).',
  'summarize-tree': 'Recursively summarizes sections with hierarchical navigation.',
};

export function registerDescribeStage(program: Command): void {
  program
    .command('describe stage <name>')
    .description('Show detailed information about a 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);
      }
      
      console.log(`Name: ${name}`);
      console.log(`Source: ${stageInfo.source}`);
      if (stageInfo.source === 'local') {
        console.log(`Path: ${join(STAGES_DIR, name + '.ts')}`);
      }
      console.log(`Description: ${STAGE_DESCRIPTIONS[name] ?? 'Custom stage'}`);
      console.log(`Requires LLM: ${requiresLlm(name) ? 'yes' : 'no'}`);
    });
}
```

**Test Strategy:**

CLI test: `mcpctl describe stage passthrough` shows expected output. Test with custom stage, verify path is shown correctly.