zed-industries/zed · error

Received incomplete tool call: missing id or name

Error message

Received incomplete tool call: missing id or name

What it means

Guard in process_tool_calls: after assembling streamed tool-call deltas by index, a tool call still lacks an id or name, so it cannot be emitted as a valid ToolUse event. Indicates the provider sent a truncated or malformed tool-call stream.

Source

Thrown at crates/language_models/src/provider/mistral.rs:737

                }
                unexpected => {
                    log::error!("Unexpected Mistral stop_reason: {unexpected:?}");
                    events.push(Ok(LanguageModelCompletionEvent::Stop(StopReason::EndTurn)));
                }
            }
        }

        events
    }

    fn process_tool_calls(
        &mut self,
    ) -> Vec<Result<LanguageModelCompletionEvent, LanguageModelCompletionError>> {
        let mut results = Vec::new();

        for (_, tool_call) in self.tool_calls_by_index.drain() {
            if tool_call.id.is_empty() || tool_call.name.is_empty() {
                results.push(Err(LanguageModelCompletionError::from(anyhow!(
                    "Received incomplete tool call: missing id or name"
                ))));
                continue;
            }

            match parse_tool_arguments(&tool_call.arguments) {
                Ok(input) => results.push(Ok(LanguageModelCompletionEvent::ToolUse(
                    LanguageModelToolUse {
                        id: tool_call.id.into(),
                        name: tool_call.name.into(),
                        is_input_complete: true,
                        input: language_model::LanguageModelToolUseInput::Json(input),
                        raw_input: tool_call.arguments,
                        thought_signature: None,
                    },
                ))),
                Err(error) => {
                    results.push(Ok(LanguageModelCompletionEvent::ToolUseJsonParseError {

View on GitHub (pinned to f4178619ac)

Solutions

1. Retry the completion; streaming truncation is usually transient
2. Reduce response length or disable tool use if it recurs on long tool calls

When it happens

Trigger: Thrown at crates/language_models/src/provider/mistral.rs:737 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@f4178619ac (2026-08-20). Data as JSON: /api/errors/b57f5870c610168c. Report an issue: GitHub.