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MessagePart

A structured part of a message (text, tool call, or tool result).

Properties

Section titled “Properties”

args?

Section titled “args?”

optional args?: Record<string, unknown>

Arguments passed to the tool (for “tool-call” parts).

result?

Section titled “result?”

optional result?: unknown

Result returned by the tool (for “tool-result” parts).

text?

Section titled “text?”

optional text?: string

Text content (for “text” parts).

toolCallId?

Section titled “toolCallId?”

optional toolCallId?: string

Tool call ID linking a call to its result.

toolName?

Section titled “toolName?”

optional toolName?: string

Name of the tool being called or that produced the result.

type

Section titled “type”

type: "text" | "tool-call" | "tool-result"