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onToolStart: async ({ agent, tool, context }) => {
const reqId = context.context.get("requestId");
console.log(`[${reqId}] Tool starting: ${tool.name}`);
},
onToolEnd: async ({ agent, tool, output, context }) => {
const reqId = context.context.get("requestId");
console.log(`[${reqId}] Tool completed: ${tool.name}`, output);
},
onError: async ({ agent, error, context }) => {
const reqId = context.context.get("requestId");
console.error(`[${reqId}] Error occurred:`, error);
// Error tracking services integration
},
});
const productionAgent = new Agent({
name: "Production Agent",
// ... other config
hooks, // Full observability
});
```
## Real Project Examples
### E-commerce Customer Support Bot
```typescript
import { createTool } from "@voltagent/core";
const orderQueryTool = createTool({
name: "query_order",
description: "Query order status by order number",
parameters: z.object({
orderNumber: z.string().describe("Order number"),
}),
execute: async ({ orderNumber }) => {
// Database query
const order = await database.orders.findOne({ id: orderNumber });
return {
status: order.status,
trackingCode: order.trackingCode,
estimatedDelivery: order.estimatedDelivery,
};
},
});
const supportAgent = new Agent({
name: "customer-support",
instructions: "E-commerce customer support that can track orders",
tools: [orderQueryTool, refundTool, humanHandoffTool],
memory: new LibSQLStorage(),
llm: new VercelAIProvider(),
model: openai("gpt-4o"),
});
```
Results with this system:
- 35% less human intervention
- 60% faster response time
- 24/7 availability
### Content Generation Pipeline
```typescript
// Research → Writing → Review → Publishing workflow
const contentPipeline = new Agent({
name: "Content Creator",
instructions: "Coordinator that researches, writes, and reviews blog posts",
subAgents: [researchAgent, writerAgent, editorAgent],
tools: [seoAnalyzer, plagiarismChecker, publishTool],
});
const result = await contentPipeline.generateText(
"Write an SEO-optimized blog post about new features in React 19"
);
```
## Debugging & Monitoring: VoltOps Console
Visual debugging console integrated with the framework:
```bash
npm run dev
# VoltOps Console: https://console.voltagent.dev
```
What you can do from the console:
- **Real-time conversation monitoring**
- **Tool execution tracing**
- **Memory state inspection**
- **Performance metrics**
- **Error debugging**
![VoltOps Workflow Observability](https://cdn.voltagent.dev/docs/workflow-observability-demo.gif)
This visual-first approach makes the debugging process more understandable.
## Migration Guide