📉 feat: Add Token Usage Tracking for Agents API Routes (#11600)

* feat: Implement token usage tracking for OpenAI and Responses controllers

- Added functionality to record token usage against user balances in OpenAIChatCompletionController and createResponse functions.
- Introduced new utility functions for managing token spending and structured token usage.
- Enhanced error handling for token recording to improve logging and debugging capabilities.
- Updated imports to include new usage tracking methods and configurations.

* test: Add unit tests for recordCollectedUsage function in usage.spec.ts

- Introduced comprehensive tests for the recordCollectedUsage function, covering various scenarios including handling empty and null collectedUsage, single and multiple usage entries, and sequential and parallel execution cases.
- Enhanced token handling tests to ensure correct calculations for both OpenAI and Anthropic formats, including cache token management.
- Improved overall test coverage for usage tracking functionality, ensuring robust validation of expected behaviors and outcomes.

* test: Add unit tests for OpenAI and Responses API controllers

- Introduced comprehensive unit tests for the OpenAIChatCompletionController and createResponse functions, focusing on the correct invocation of recordCollectedUsage for token spending.
- Enhanced tests to validate the passing of balance and transactions configuration to the recordCollectedUsage function.
- Ensured proper dependency injection of spendTokens and spendStructuredTokens in the usage recording process.
- Improved overall test coverage for token usage tracking, ensuring robust validation of expected behaviors and outcomes.

packages/api/src/agents/index.ts

@@ -8,6 +8,7 @@ export * from './legacy';
 export * from './memory';
 export * from './migration';
 export * from './openai';
+export * from './usage';
 export * from './resources';
 export * from './responses';
 export * from './run';