CallToolResult extension type

The server's response to a tool call.

Any errors that originate from the tool SHOULD be reported inside the result object, with isError set to true, not as an MCP protocol-level error response. Otherwise, the LLM would not be able to see that an error occurred and self-correct.

However, any errors in finding the tool, an error indicating that the server does not support tool calls, or any other exceptional conditions, should be reported as an MCP error response.

on

• Map<String, Object?>

Implemented types

• Result

Constructors

CallToolResult.new({Meta? meta, required List<Content> content, bool? isError})

factory

CallToolResult.fromMap(Map<String, Object?> _value)

Properties

content → List<Content>

The type of content, either TextContent, ImageContent, or EmbeddedResource,

no setter

isError → bool?

Whether the tool call ended in an error.

no setter

meta → Meta?

no setter, inherited