Claude Models Thinking block error

[tungdapoet]

Description

This error happens when start writing tools, or streaming in thinking block

Plugins

oh-my-opencode

OpenCode version

Any version

Steps to reproduce

Ask agent to write something

Screenshot and/or share link

No response

Operating System

macOS 26.1

Terminal

No response

[github-actions]

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

• Expected thinking or redacted_thinking but found tool_use #8010: Expected thinking or redacted_thinking but found tool_use (similar error on macOS)
• Claude extended thinking + tool use: signature not preserved in message history #6176: Claude extended thinking + tool use: signature not preserved in message history (oh-my-opencode plugin)
• [bug] v0.8.0 Introduced thinking block bug with Claude Sonnet 4: "AI_APICallError: messages.3.content.0.type: Expected thinking or redacted_thinking, but found text." #2599: Thinking block bug with Claude Sonnet 4 (same API validation error after tool invocation)
• Claude Extended Thinking: assistant message content order causes API error #9364: Claude Extended Thinking: assistant message content order causes API error (root cause analysis)
• Expected thinking or redacted_thinking, but found tool_use #3077: Expected thinking or redacted_thinking, but found tool_use (recurring error)

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

[rekram1-node]

what provider?

[carlesandres]

This is happening to me while I am building with opencode/gpt-5.2-codex as my primary BUILD agent and I run a /commit command which is bound to github-copilot/claude-sonnet-4.5

---
description: Commit changes with conventional commit format
model: github-copilot/claude-sonnet-4.5
---

Analyze code changes and create well-structured git commits following conventional commit standards.

EDIT: Actually no. Apologies. This is what's happening to me. I will open a separate issue.

[rekram1-node]

@carlesandres what version are u using? There was a bug specifically for the github copilot provider but it should be fixed now