Function isToolResultObject

nodejs/src/session.ts:1395–1420

* Type guard that checks whether a value is a ToolResultObject. * A valid object must have a string `textResultForLlm` and a recognized `resultType`.

(value: unknown)

 * A valid object must have a string `textResultForLlm` and a recognized `resultType`.
 */
function isToolResultObject(value: unknown): value is ToolResultObject {
    if (typeof value !== "object" || value === null) {
        return false;
    }

    if (
        !("textResultForLlm" in value) ||
        typeof (value as ToolResultObject).textResultForLlm !== "string"
    ) {
        return false;
    }

    if (!("resultType" in value) || typeof (value as ToolResultObject).resultType !== "string") {
        return false;
    }

    const allowedResultTypes: Array<ToolResultObject["resultType"]> = [
        "success",
        "failure",
        "rejected",
        "denied",
        "timeout",
    ];

    return allowedResultTypes.includes((value as ToolResultObject).resultType);
}

/** Convert a canvas handler error into a ResponseError with a structured data envelope. */
function toCanvasRpcError(error: unknown): ResponseError<unknown> {