class

MCProtocol::CallToolResult

Inherits JSON::Serializable < Reference < Object

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.

Constructors

new(pull : JSON::PullParser)

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new(content : Array(String), _meta : JSON::Any | Nil = Nil, isError : Bool | Nil = Nil)

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new(*, __pull_for_json_serializable pull : JSON::PullParser)

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Instance methods

_meta

This result property is reserved by the protocol to allow clients and servers to attach additional metadata to their responses.

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content

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isError

Whether the tool call ended in an error.

If not set, this is assumed to be false (the call was successful).

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