`agents.retrieve` throwing 500

**ENVIRONMENT:**

- SDK version: 0.6.6
- Python: 3.13.5
- OS: linux
- Date Reported: 07/02/2025

**REPRODUCING:**

```
with Glean(api_token=config.GLEAN_API_TOKEN, instance=config.GLEAN_INSTANCE) as glean:
    agent = glean.client.agents.retrieve(agent_id=config.GLEAN_AGENT_ID)
```

Other endpoints such as `retrieve_schemas` and `list` are working with the same config