openapi: 3.1.3
info:
  title: Spiceflow Documentation
  description: Development documentation
  version: 0.0.0
servers:
  - url: https://api.com
paths:
  /openapi:
    get:
      responses:
        '200':
          description: ''
        default:
          description: ''

---
Let's break this down step by step:

1. The route is a simple GET request to `/openapi`
2. No request body or query parameters are defined
3. No specific response schema is defined, so we'll use `any` for the response type
4. We'll add the method to the `ExampleClient` class
5. We'll follow the existing pattern of using the `fetch` method
6. We'll add proper error handling using the existing `ExampleError` class

Here's the implementation:

```typescript:client.ts
// ... existing code ...

export class ExampleClient {
  // ... existing code ...

  /**
   * GET /openapi
   * @tags openapi
   */
  async getOpenApi(): Promise<any> {
    try {
      const response = await this.fetch({
        method: 'GET',
        path: '/openapi',
      })

      if (!response.ok) {
        const errorData = await response.json().catch(() => ({}))
        throw new ExampleError('Request failed', {
          status: response.status,
          data: errorData,
        })
      }

      return response.json()
    } catch (error) {
      if (error instanceof ExampleError) {
        throw error
      }
      throw new ExampleError('Network error', { status: 500 })
    }
  }
}

// ... existing code ...
```