> ## Documentation Index
> Fetch the complete documentation index at: https://docs.devin.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# ToolCallEvent

> A tool call started or changed.

A tool call started or changed. `call` is the merged snapshot across all
updates for this `toolCallId`; `settled` is true once it reached a terminal
status (completed, failed, canceled, or rejected).

## Properties

**call** `ToolCall` *required*

**settled** `boolean` *required*

**type** `"tool_call"` *required*

**update** `SessionUpdate` *required*


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