500 InternalServerError from Google Generative AI client with no retry/backoff

[EngineerAbdullahIqbal]

When calling the Generative AI endpoint via openai-agents-sdk (via AsyncOpenAI + OpenAIChatCompletionsModel), we occasionally receive a raw 500 with no automatic retry or helpful diagnostics:

openai.InternalServerError: Error code: 500 - [{'error': {
  'code': 500,
  'message': 'An internal error has occurred. Please retry or report in https://developers.generativeai.google/guide/troubleshooting',
  'status': 'INTERNAL'
}}]

This bubbles up directly to user code, with no built‑in exponential‑backoff or payload dump.

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Steps to Reproduce:

1. Install latest openai and openai-agents-sdk.
2. Initialize SDK with Gemini-Flash endpoint.
3. Send any valid prompt via Runner.run(...) repeatedly in a loop.
4. Observe occasional 500 errors with no retry.

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Expected Behavior:

• SDK should implement a configurable retry/backoff policy on HTTP 500s (e.g. up to N attempts, doubling delay).
• On fatal server errors, expose request payload (or at least message lengths and roles) to help diagnose malformed inputs.

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Actual Behavior:

• A single raw InternalServerError exception is raised.
• No retry, no backoff, no context about which request triggered it.

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Suggested Fixes:

1. Wrap calls to openai_client.chat.completions.create in a common retry decorator (e.g. using tenacity or custom backoff).
2. On failure, log the HTTP request body (without API key) at debug level.
3. Expose retry/backoff parameters via RunConfig or client constructor.