Problem Description

We're experiencing issues integrating with the Relevance.AI API in our Sales Agent AI Assistant Platform. After multiple implementation attempts, we're receiving a "Resource not found (404): The API endpoint or project does not exist" error. Our application currently has multiple implementation files (relevanceai.ts, relevanceAICall.ts, relevanceAICall.new.ts, and relevanceAICall.fixed.ts) with inconsistent approaches to URL formatting, authentication, and endpoint structures. We initially tried using https://api.relevance.ai as the base URL, but documentation indicates we should be using https://api-{region-id}.stack.tryrelevance.com/latest with region-specific authentication.

Acceptance Criteria

1. A consolidated implementation that correctly integrates with Relevance.AI's API using:

   • The proper URL format: https://api-{region-id}.stack.tryrelevance.com/latest
   • Correct authentication header: {ProjectID}:{APIKey} without Bearer prefix
   • Proper request body structures for different endpoints

2. The implementation should support:

   • Synchronous and asynchronous agent operations
   • Tool execution
   • Proper error handling with descriptive messages
   • Fallback to Anthropic when Relevance.AI is unavailable

3. A diagnostic utility function that can verify:

   • Authentication is working
   • Region and project ID are valid
   • Agent/tool IDs exist

4. Documentation on the correct parameter formats and required fields for different endpoint types

5. Removal of outdated/incorrect implementations to prevent future confusion