zed-industries/zed · error

Inline assistant called `{REWRITE_SECTION_TOOL_NAME}` multip

Error message

Inline assistant called `{REWRITE_SECTION_TOOL_NAME}` multiple times

What it means

Raised by the inline assistant's tool-use processor when the model emits a second rewrite_section tool call while a previous rewrite is already in progress. The protocol for inline edits allows exactly one rewrite_section invocation per response; a duplicate indicates the model violated that contract. The offending input is the redundant REWRITE_SECTION tool call in the completion stream.

Source

Thrown at crates/agent_ui/src/buffer_codegen.rs:1201

            }

            let rewrite_state: Arc<Mutex<Option<RewriteState>>> = Arc::new(Mutex::new(None));
            let process_rewrite_state = rewrite_state.clone();
            let process_tool_use =
                move |tool_use: LanguageModelToolUse| -> Result<Option<ToolUseOutput>> {
                    match tool_use.name.as_ref() {
                        REWRITE_SECTION_TOOL_NAME => {
                            let input = match tool_use.input.parse::<RewriteSectionInput>() {
                                Ok(input) => input,
                                Err(_) if !tool_use.is_input_complete => return Ok(None),
                                Err(error) => {
                                    return Err(error.context(format!(
                                        "invalid input for `{REWRITE_SECTION_TOOL_NAME}` tool"
                                    )));
                                }
                            };
                            let mut rewrite_state = process_rewrite_state.lock();
                            if let Some(state) = rewrite_state.as_ref()
                                && state.tool_use_id != tool_use.id
                            {
                                return Err(anyhow!(
                                    "Inline assistant called `{REWRITE_SECTION_TOOL_NAME}` \
                                     multiple times"
                                ));
                            }
                            let state = rewrite_state.get_or_insert_with(|| RewriteState {
                                tool_use_id: tool_use.id,
                                chars_read: 0,
                                is_input_complete: false,
                            });
                            let Some(text_slice) = input.replacement_text.get(state.chars_read..)
                            else {
                                return Ok(None);
                            };
                            let text = text_slice.to_string();
                            state.chars_read = input.replacement_text.len();

View on GitHub (pinned to 5a9b9558db)

Solutions

1. Retry the inline assist so the model produces a single rewrite_section call
2. Rephrase the instruction so only one contiguous rewrite is needed
3. Split very large edits into multiple sequential inline assists

When it happens

Trigger: Thrown at crates/agent_ui/src/buffer_codegen.rs:1199 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@5a9b9558db (2026-08-20). Data as JSON: /api/errors/491b07cdc31e2004. Report an issue: GitHub.