AI_APICallError: `tool_use` ids were found without `tool_result` blocks immediately after

[ShamanicArts]

On claude pro - sonnet 4

AI_APICallError: messages.13:
`tool_use` ids were found without
`tool_result` blocks immediately
after:
toolu_01CfJCsh21fK1pAXsXWYJYBA,
toolu_01NoqnwsaxoK3AYM2FyrxmjN.
Each `tool_use` block must have a
corresponding `tool_result` block
in the next message.

happpens regularly . conversation cannot be continued without switching to a different model

https://opencode.ai/s/gkaS8vZY

ubuntu via WSL

[AnsgarH1]

I also got the error on MacOS with OpenCode v0.5.5

[rekram1-node]

did this happen after an abort or something? Like you aborted a request then tried to continue convo?

[ShamanicArts]

did this happen after an abort or something? Like you aborted a request then tried to continue convo?

this commonly seems to be a trigger, but is not the sole trigger. it can occur randomly. it can be mitigated by undoing to the message before the message which triggers this error

[esafak]

I am getting this error on 0.5.28 with opus 4.1 as the planning agent. I exited and restarted opencode and the problem persisted after resuming the session.

I suspect there is 'corruption' in the history as I can also trigger this error by running /compact after it occurs.

[namchuai]

I'm also faced this issue

messages.453: `tool_use` ids were found without `tool_result` blocks immediately after: toolu_01BmQLHErsVFKDSd51CUnUXg. Each `tool_use` block must have a corresponding `tool_result` block in the next message.

Edit 1: Switching other model (to Claude Opus 4.1) does not help.

[rekram1-node]

Yeah this is a bug with the anthropic api itself it sends back duplicate content or something and messes up the state of the client.

We can fix it on our end its just a little messy reordering things all the time

[sawy3r]

I'm also facing this one, it's happening across at least Sonnet 4, Sonnet 4.5 and Opus 4.5. I'm seeing it when the agent reads a pdf file (in the same project). Once this happens it corrupts the conversation, I need to undo the prompt that caused it, and can then continue, but to no avail to read the PDF and get past that point. Switching to a non-Anthropic model of course enables it to proceed (as the error is being returned from the Anthropic API). I can then switch back to the Anthropic model and continue, so there is a workaround albeit not ideal!

Running opencode binary version 1.0.157 on MacOS

[rekram1-node]

@sawy3r now that's interesting would u be able to share your session reproducing that?

opencode export > session.json

[sawy3r]

@sawy3r now that's interesting would u be able to share your session reproducing that?

opencode export > session.json

Sure can!

See attached, I've redacted it slightly and truncated the PDF base64 data that was included (I've also attached the PDF for your reference as well. It happens with any I try at the moment). I set this session up to attempt to replicate it, and it happened right away at the first prompt, where I asked the agent to read a PDF.

sessionNew-redacted.json AI_APICallError_ tool_use ids were found without tool_result blocks immediately after · Issue #1662 · sst_opencode.pdf

[tagpro]

ctrl+x u will undo the previous message. Undo until the error message disappears from the chat. This can happen when a message response was interrupted and the result from the message wasn't created. So, undo until chat history is at a good stage and then continue again.