tool_use` ids were found without `tool_result` blocks

[berenddeboer]

Description

With Anthropic Claude Opus 4.5 (latest)

Seems unrecoverable:

messages.55: `tool_use` ids were found without `tool_result` blocks immediately after:
toolu_01JKfqxRrU8oAPSczPHTGAkZ. Each `tool_use` block must have a corresponding
`tool_result` block in the next message.

Does not want to proceed after this.

OpenCode version

1.0.115

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

Ubuntu 24.04

Terminal

Alacritty, tmux

[github-actions]

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

• AI_APICallError: tool_use blocks found without corresponding tool_result blocks #2720: AI_APICallError: tool_use blocks found without corresponding tool_result blocks
• AI_APICallError: tool_use ids were found without tool_result blocks immediately after #1662: AI_APICallError: tool_use ids were found without tool_result blocks immediately after (Claude Pro - Sonnet 4)
• AI_APICallError: messages.3: tool_use ids were found without tool_result blocks immediately after: toolu_01G5ipgNZWmDHuV6cvzyQpfH. Each tool_use block must have a corresponding tool_result block in the next message. #2214: AI_APICallError: messages.3: tool_use ids were found without tool_result blocks immediately after (occurs when interrupting response mid-flight in plan mode)

These all report the same error about tool_use blocks not having corresponding tool_result blocks. The issue appears to be a known bug with the messaging format/validation when using Claude models.

Feel free to ignore if this relates to a specific new trigger or different use case with Claude Opus 4.5.

[rekram1-node]

okay enoughs enough ill fix this

The anthropic api has some bug where it corrupts the local state, the client has to account for the discrepency itself

Until it's fixed you can always do /undo

[rekram1-node]

im gonna close this as a duplicate but just know this is top of mind to address soon

[rekram1-node]

@berenddeboer any chance you can send me the file session.json from an export dump:

opencode export > session.json

Itll open up a selector if you can choose the session that errored for u