# Task ID: 95

**Title:** Implement mcpctl proxymodel validate Command

**Status:** cancelled

**Dependencies:** 78 ✓, 79 ✓

**Priority:** medium

**Description:** Add CLI command to validate a proxymodel definition, checking that all stages resolve and config is valid.

**Details:**

Create `src/cli/src/commands/proxymodel-validate.ts`:

```typescript
import { Command } from 'commander';
import { loadProxyModels } from 'mcplocal/proxymodel/loader';
import { getStage, loadCustomStages } from 'mcplocal/proxymodel/stage-registry';

export function registerProxymodelValidate(program: Command): void {
  program
    .command('proxymodel validate <name>')
    .description('Validate a proxymodel definition')
    .action(async (name: string) => {
      await loadCustomStages();
      const models = await loadProxyModels();
      const model = models.get(name);
      
      if (!model) {
        console.error(`Proxymodel '${name}' not found`);
        process.exit(1);
      }
      
      let valid = true;
      const errors: string[] = [];
      
      // Check all stages resolve
      for (const stageConfig of model.spec.stages) {
        const stage = getStage(stageConfig.type);
        if (!stage) {
          errors.push(`Stage '${stageConfig.type}' not found`);
          valid = false;
        }
      }
      
      // Check controller is valid
      const validControllers = ['gate', 'none'];
      if (model.spec.controller && !validControllers.includes(model.spec.controller)) {
        errors.push(`Unknown controller '${model.spec.controller}'`);
        valid = false;
      }
      
      if (valid) {
        console.log(`✓ Proxymodel '${name}' is valid`);
      } else {
        console.error(`✗ Proxymodel '${name}' has errors:`);
        for (const err of errors) {
          console.error(`  - ${err}`);
        }
        process.exit(1);
      }
    });
}
```

**Test Strategy:**

CLI test: valid proxymodel passes, proxymodel with unknown stage fails with clear error, proxymodel with unknown controller fails. Test with both built-in and custom stages.