Bug: Invalid prompt at compaction

[jerome-benoit]

Description

At compaction with latest git on a regular basis:

AI_InvalidPromptError: Invalid prompt: The messages must be a ModelMessage[]. If you have passed a UIMessage[], you can use convertToModelMessages to convert them.

Plugins

No response

OpenCode version

git

Steps to reproduce

1. Use GitHub Copilot provider (Claude Opus 4.5, but does not matter) with high reasoning
2. Prompt until compaction is triggered
3. Repeat until the error occurs

Screenshot and/or share link

No response

Operating System

GNU/Linux

Terminal

tmux

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• Empty message content causes Anthropic API errors during compaction #6446: Empty message content causes Anthropic API errors during compaction (related error handling and message conversion at compaction)

Feel free to ignore if none of these address your specific case.

[jerome-benoit]

Cannot reproduce with update to latest git ...

[jerome-benoit]

Just occurred again with latest git ...

[rekram1-node]

Ah ur building off of dev sorry about that, hsould be fixed

[jerome-benoit]

Ah ur building off of dev sorry about that, hsould be fixed

dev is meant to break and dev users meant to report breakage before release ;)