Your API request included an 'assistant' message in the final position

[stabenfeldt]

Thanks for building this great tool!
I'm so happy to get Claude incorporated into my ViM workflow!
The first few messages within the chat worked flawlessly, but then it ended here:

How do you think I could fix this issue?

[atihonovschi]

The main issue you've hit here is the "overloaded_error" - this one is sent when Claude servers are overloaded and cannot proceed with the request. Last time (September-October 2025) looks like these are not so frequent.

However then you tried to write message (Why did you return this?) directly after the Claude response, without preceding You:. And this led to the following errors - like you've added response on your own.