zed-industries/zed · error

Invalid input for inline assistant tool `{tool_name}`: {json

Error message

Invalid input for inline assistant tool `{tool_name}`: {json_parse_error}

What it means

Raised when a tool call in the inline assistant's completion stream carries JSON input that fails to parse into the expected tool input type (RewriteSectionInput or the failure-message input). The offending input is the raw tool_name plus its malformed JSON payload from the model; note that incomplete streaming input is waited on, so this fires only for truly unparseable complete JSON.

Source

Thrown at crates/agent_ui/src/buffer_codegen.rs:1339

                                )),
                                cx,
                            );
                        } else if matches!(reason, StopReason::MaxTokens | StopReason::Refusal) {
                            finish_with_status(
                                CodegenStatus::Error(anyhow!(
                                    "Inline assistant response was interrupted ({reason:?})"
                                )),
                                cx,
                            );
                        } else {
                            finish_with_status(CodegenStatus::Done, cx);
                        }
                        return;
                    }
                    Ok(LanguageModelCompletionEvent::ToolUseJsonParseError {
                        tool_name,
                        json_parse_error,
                        ..
                    }) => {
                        finish_with_status(
                            CodegenStatus::Error(anyhow!(
                                "Invalid input for inline assistant tool \
                                 `{tool_name}`: {json_parse_error}"
                            )),
                            cx,
                        );
                        return;
                    }
                    Ok(
                        LanguageModelCompletionEvent::Queued { .. }
                        | LanguageModelCompletionEvent::Started
                        | LanguageModelCompletionEvent::Text(_)
                        | LanguageModelCompletionEvent::Thinking { .. }
                        | LanguageModelCompletionEvent::RedactedThinking { .. }
                        | LanguageModelCompletionEvent::ReasoningDetails(_)
                        | LanguageModelCompletionEvent::Compaction(_),

View on GitHub (pinned to 5a9b9558db)

Solutions

1. Retry the inline assist — malformed tool JSON is usually a transient model error
2. Simplify the edit request to reduce the complexity of generated tool input
3. Switch models if one provider repeatedly emits invalid tool JSON

When it happens

Trigger: Thrown at crates/agent_ui/src/buffer_codegen.rs:1337 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/eb167000dbfcee89. Report an issue: GitHub.