MCP Agent TypeScript Port

/** * Helper functions for working with content objects */ import { TextContent, ImageContent, EmbeddedResource, ResourceContents } from '@modelcontextprotocol/sdk/types.js'; /** * Extract text content from a content object if available */ export function getText( content: TextContent | ImageContent | EmbeddedResource | ResourceContents ): string | null { // Direct text content if ('type' in content && content.type === 'text' && 'text' in content) { return (content as TextContent).text; } // Text resource contents if ('text' in content && typeof content.text === 'string') { return content.text; } // Embedded resource with text if ('type' in content && content.type === 'resource' && 'resource' in content) { const embedded = content as EmbeddedResource; if ('text' in embedded.resource) { return embedded.resource.text as string; } } return null; } /** * Extract image data from a content object if available */ export function getImageData( content: TextContent | ImageContent | EmbeddedResource ): string | null { // Direct image content if ('type' in content && content.type === 'image' && 'data' in content) { return (content as ImageContent).data; } // Embedded resource with blob if ('type' in content && content.type === 'resource' && 'resource' in content) { const embedded = content as EmbeddedResource; if ('blob' in embedded.resource) { return embedded.resource.blob as string; } } return null; } /** * Extract MIME type from a content object if available */ export function getMimeType( content: TextContent | ImageContent | EmbeddedResource | ResourceContents ): string | null { // Image content has mimeType if ('type' in content && content.type === 'image' && 'mimeType' in content) { return (content as ImageContent).mimeType; } // Resource contents might have mimeType if ('mimeType' in content && typeof content.mimeType === 'string') { return content.mimeType; } // Embedded resource if ('type' in content && content.type === 'resource' && 'resource' in content) { const embedded = content as EmbeddedResource; if ('mimeType' in embedded.resource) { return embedded.resource.mimeType as string; } } return null; } /** * Check if content is text-based */ export function isTextContent( content: TextContent | ImageContent | EmbeddedResource | ResourceContents ): boolean { return getText(content) !== null; } /** * Check if content is image-based */ export function isImageContent( content: TextContent | ImageContent | EmbeddedResource ): boolean { return getImageData(content) !== null; } /** * Convert content array to plain text */ export function contentToText( contents: Array<TextContent | ImageContent | EmbeddedResource> ): string { return contents .map(content => { const text = getText(content); if (text) return text; if (isImageContent(content)) { const mimeType = getMimeType(content) || 'unknown'; return `[Image: ${mimeType}]`; } return '[Unknown content]'; }) .join('\n'); }