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agent: Fix Mistral tool use error message (#34692)

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Closes #32675

Exactly the same changes as in #33640 by @sviande

The PR has been in WIP state for 3 weeks with no activity, and the issue
basically makes Mistral models unusable. I have tested the changes
locally, and it does indeed work. Full credit goes to @sviande, I just
want this feature to be finished.

Release Notes:

- agent: Fixed an issue with tool calling with the Mistral provider
(thanks [@sviande](https://github.com/sviande) and
[@armyhaylenko](https://github.com/armyhaylenko))

Co-authored-by: sviande <sviande@gmail.com>
This commit is contained in:
Oleksandr Mykhailenko 2025-07-19 18:59:57 +03:00 • committed by Peter Tripp
parent 8da6604165
commit 44946231aa
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1 changed files with 14 additions and 20 deletions
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34
crates/language_models/src/provider/mistral.rs
View file

@ -410,8 +410,20 @@ pub fn into_mistral(
.push_part(mistral::MessagePart::Text { text: text.clone() });
}
MessageContent::RedactedThinking(_) => {}
MessageContent::ToolUse(_) | MessageContent::ToolResult(_) => {
// Tool content is not supported in User messages for Mistral
MessageContent::ToolUse(_) => {
// Tool use is not supported in User messages for Mistral
}
MessageContent::ToolResult(tool_result) => {
let tool_content = match &tool_result.content {
LanguageModelToolResultContent::Text(text) => text.to_string(),
LanguageModelToolResultContent::Image(_) => {
"[Tool responded with an image, but Zed doesn't support these in Mistral models yet]".to_string()
}
};
messages.push(mistral::RequestMessage::Tool {
content: tool_content,
tool_call_id: tool_result.tool_use_id.to_string(),
});
}
}
}
@ -482,24 +494,6 @@ pub fn into_mistral(
}
}
for message in &request.messages {
for content in &message.content {
if let MessageContent::ToolResult(tool_result) = content {
let content = match &tool_result.content {
LanguageModelToolResultContent::Text(text) => text.to_string(),
LanguageModelToolResultContent::Image(_) => {
"[Tool responded with an image, but Zed doesn't support these in Mistral models yet]".to_string()
}
};
messages.push(mistral::RequestMessage::Tool {
content,
tool_call_id: tool_result.tool_use_id.to_string(),
});
}
}
}
// The Mistral API requires that tool messages be followed by assistant messages,
// not user messages. When we have a tool->user sequence in the conversation,
// we need to insert a placeholder assistant message to maintain proper conversation