AI: Copilot with Claude 4 errors on any chatting

[0x00ahmad]

Summary

AI Assistant response stops/crashes halfway in generating a response.

Description

Steps to trigger the problem:

1. Open AI assistant chat window, choose Claude Sonnet 4 (Copilot chat) specifically
2. give it a couple files/folders
3. and hit enter

Expected Behavior:
A full proper response is generated.

Actual Behavior:
It throws a error modal:
"""
Error interacting with language model
The final message must be from the user. To provide a system prompt, you must provide the system prompt followed by a user prompt.
"""
– Midway of response.

Model Provider Details

• Provider: Copilot Chat
• Model Name: Claude Sonnet 4
• Mode: Agent Panel, in Ask mode
• Other Details: I just use context7, but I didn't use anything beyond what I described above

Even though The image below shows where it stopped for me,

Zed Version and System Specs

Zed: v0.191.4 (Zed)
OS: macOS 15.5.0
Memory: 48 GiB
Architecture: aarch64

[bennetbo]

Duplicate of #32888