> ## Documentation Index
> Fetch the complete documentation index at: https://docs.coreweave.com/llms.txt
> Use this file to discover all available pages before exploring further.

# SDK

<Card title="Why does my API key fail with 'must be 40 characters long'?" href="/support/models/articles/why-does-my-api-key-fail-with-must-be-40-characters" arrow="true" horizontal>
  Forge now issues longer API keys (about 86 characters). Older wandb SDK versions validate exactly 40 characters and reje ...
</Card>


## Related topics

- [Python SDK](/products/agent-lens/reference/python-sdk.md)