Thinking tokens are not attached in between turns to Claude with extended thinking

[willkoh]

Please read this first

• Have you read the custom model provider docs, including the 'Common issues' section? Model provider docs Yes
• Have you searched for related issues? Others may have faced similar issues. Yes

Describe the question

Although preserve_thinking_tokens is a param for Converter.items_to_messages, it doesn't attach the thinking tokens unless there was a tool call.

I have a fix for this in a local branch with tests but I don't have permission to push the branch up.

Debug information

• Agents SDK version: v0.6.3
• Python version: 3.12

Repro steps

Enable thinking for Anthropic models using LitellmModel.

Expected behavior

Thinking tokens are attached to the assistant message.

[seratch]

Thanks for sharing this. Anyone can submit pull requests to this repo. If you have a fix for the issue, we're happy to review it!

[willkoh]

Oh awesome. Must've been a laptop configuration issue that I couldn't push. Will do tonight.