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Correct syntax for json workflow tool usage with documentation

**Here is the correct JSON syntax for adding a tool node to a Vapi workflow:**

```json
{
  "nodes": [
    {
      "type": "tool",
      "name": "lookup_customer",
      "toolId": "your-tool-id-here",
      "isStart": false
    }
  ],
  "edges": [
    {
      "from": "previous_node_name",
      "to": "lookup_customer"
    }
  ],
  "name": "Example Workflow"
}
```
*Replace `your-tool-id-here` with your actual tool's ID. For more details, see the [official documentation](https://docs.vapi.ai/tools/custom-tools).*

Sources:
- [Custom Tools](https://docs.vapi.ai/tools/custom-tools)
- [Workflow Controller Create (API Reference)](https://docs.vapi.ai/api-reference/workflow/workflow-controller-create)

Could you clarify which part of JSON workflow tool usage you need help with—are you looking for the syntax to define a tool node in a workflow, the API request format, or something else?

Sources:
- [Custom Tools Documentation](https://docs.vapi.ai/tools-calling)
- [Workflows Quickstart](https://docs.vapi.ai/workflows/quickstart)
- [Workflows Overview](https://docs.vapi.ai/workflows/overview)

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