[Bug]: Switching from one provider back to claude fails #2646
Description
Bug Description
I was switching a conversation from Minimax to Claude Code, it gives a 400 error due to Invalid signatureinthinking block".
Steps to Reproduce
enter a code base
:config-provider
-> select minimax
: tell me what you think about this codebase
-> let it think a bit and then ctrl-C
:config-provider
-> select Claude Code
✗ : continue
⏺ [17:28:54] Continue 3bbf0a77-c535-40ac-9853-071f882af251
⏺ [17:28:54] ERROR: POST https://api.anthropic.com/v1/messages
Caused by: 400 Bad Request Reason: {"type":"error","error":{"type":"invalid_request_error","message":"messages.1.content.19: Invalid `signature` in `thinking` block"},"request_id":"req_011CZLQZWUyjyW2mPYVs8zfb"}
Caused by: Invalid Status Code: 400
Repeating this using forge --dump and forge --conversation has the same effect
Expected Behavior
Conversation continues with different provider
Actual Behavior
400 error from claude API.
Error Logs
Forge Version
2.1.0
Operating System
macOS
OS Version
macOS 26.3.1
AI Provider
Other
Model
minimax 2.7 and Claude Opus 4.6
Installation Method
npx forgecode@latest
Configuration
~/forge/.config.json
{
"keyInfo": null,
"provider": "claude_code",
"model": {
"minimax": "MiniMax-M2.7",
"claude_code": "claude-opus-4-6"
}
}