# Task ID: 35

**Title:** Implement health monitoring across all tiers

**Status:** done

**Dependencies:** 33 ✓, 34 ✓

**Priority:** medium

**Description:** Extend health monitoring to track connectivity and status across mcplocal, mcpd, and individual MCP server instances.

**Details:**

1. Update mcplocal health monitor in `src/mcplocal/src/health.ts`:
   ```typescript
   export class TieredHealthMonitor {
     async checkHealth(): Promise<TieredHealthStatus> {
       return {
         mcplocal: {
           status: 'healthy',
           llmProvider: await this.checkLlmProvider(),
           uptime: process.uptime()
         },
         mcpd: await this.checkMcpdHealth(),
         instances: await this.checkInstancesHealth()
       };
     }
     
     private async checkMcpdHealth(): Promise<McpdHealth> {
       try {
         const health = await this.mcpdClient.get('/api/v1/health');
         return { status: 'connected', ...health };
       } catch {
         return { status: 'disconnected' };
       }
     }
     
     private async checkInstancesHealth(): Promise<InstanceHealth[]> {
       const instances = await this.mcpdClient.get('/api/v1/instances');
       return instances.map(i => ({
         name: i.name,
         status: i.status,
         lastHealthCheck: i.lastHealthCheck
       }));
     }
   }
   ```
2. Add health endpoint to mcplocal HTTP server: `GET /health`
3. Update mcpctl status command to display tiered health
4. Add degraded state detection:
   - LLM provider unavailable but mcpd reachable
   - Some instances down but others healthy
5. Add health event notifications for state transitions
6. Add configurable health check intervals

**Test Strategy:**

1. Unit test: Health check correctly identifies all states
2. Unit test: Degraded state is detected correctly
3. Integration test: Full health check across all tiers
4. Test health endpoint returns correct format
5. Test mcpctl status displays health correctly
6. Test state transition events are emitted