Function convertToFunctionResponse

packages/core/src/core/coreToolScheduler.ts:150–209

(
  toolName: string,
  callId: string,
  llmContent: PartListUnion,
)

}

export function convertToFunctionResponse(
  toolName: string,
  callId: string,
  llmContent: PartListUnion,
): PartListUnion {
  const contentToProcess =
    Array.isArray(llmContent) && llmContent.length === 1
      ? llmContent[0]
      : llmContent;

  if (typeof contentToProcess === 'string') {
    return createFunctionResponsePart(callId, toolName, contentToProcess);
  }

  if (Array.isArray(contentToProcess)) {
    const functionResponse = createFunctionResponsePart(
      callId,
      toolName,
      'Tool execution succeeded.',
    );
    return [functionResponse, ...contentToProcess];
  }

  // After this point, contentToProcess is a single Part object.
  if (contentToProcess.functionResponse) {
    if (contentToProcess.functionResponse.response?.['content']) {
      const stringifiedOutput =
        getResponseTextFromParts(
          contentToProcess.functionResponse.response['content'] as Part[],
        ) || '';
      return createFunctionResponsePart(callId, toolName, stringifiedOutput);
    }
    // It's a functionResponse that we should pass through as is.
    return contentToProcess;
  }

  if (contentToProcess.inlineData || contentToProcess.fileData) {
    const mimeType =
      contentToProcess.inlineData?.mimeType ||
      contentToProcess.fileData?.mimeType ||
      'unknown';
    const functionResponse = createFunctionResponsePart(
      callId,
      toolName,
      `Binary content of type ${mimeType} was processed.`,
    );
    return [functionResponse, contentToProcess];
  }

  if (contentToProcess.text !== undefined) {
    return createFunctionResponsePart(callId, toolName, contentToProcess.text);
  }

  // Default case for other kinds of parts.
  return createFunctionResponsePart(
    callId,
    toolName,
    'Tool execution succeeded.',