Usage Visibility for Anthropic and OpenAI when using agent-workflow

[bipulsimkhada-cr]

1. Anthropic (Streaming)

When using agent-workflow with Anthropic and stream = true, the usage info is filtered out from the chunk.
The usage info is of type "message-delta", and the chunk is not yielded in the code below:

🔗 LlamaIndexTS Anthropic LLM Code

Example payload:

{
  "type": "message_delta",
  "delta": {
    "stop_reason": "end_turn",
    "stop_sequence": null
  },
  "usage": {
    "input_tokens": 8,
    "cache_creation_input_tokens": 0,
    "cache_read_input_tokens": 0,
    "output_tokens": 12
  }
}

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2. Anthropic and OpenAI (Non-Streaming)

When running with agent.run, it is returning the finalEvent.
However, the finalEvent does not have usage info applicable.
https://github.com/run-llama/LlamaIndexTS/blob/main/packages/workflow/src/agent/agent-workflow.ts#L470-L476

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[marcusschiesser]

Thanks for pointing this out - want to send us an PR @bipulsimkhada-cr ?

[Kannav02]

HI @marcusschiesser , if nobody is picking this up , I can have a PR ready for this soon, would that be fine?