Jina AI Remote MCP Server

Instructions

Implementation Reference

• src/tools/jina-tools.ts:148-270 (handler)

  The function that executes the read_url tool logic: normalizes the input URL, constructs headers based on options, fetches content from https://r.jina.ai/, handles errors, extracts structured data (title, links, images if requested), and returns markdown content and YAML-structured metadata.

  async ({ url, withAllLinks, withAllImages }: { url: string; withAllLinks?: boolean; withAllImages?: boolean }) => {
  	try {
  		const props = getProps();
  		// Normalize the URL first
  		const normalizedUrl = normalizeUrl(url);
  		if (!normalizedUrl) {
  			return {
  				content: [
  					{
  						type: "text" as const,
  						text: "Error: Invalid or unsupported URL",
  					},
  				],
  				isError: true,
  			};
  		}
  
  		const headers: Record<string, string> = {
  			'Accept': 'application/json',
  			'Content-Type': 'application/json',
  			'X-Md-Link-Style': 'discarded',
  		};
  
  		// Add Authorization header if bearer token is available
  		if (props.bearerToken) {
  			headers['Authorization'] = `Bearer ${props.bearerToken}`;
  		}
  
  		if (withAllLinks) {
  			headers['X-With-Links-Summary'] = 'all';
  		}
  
  		if (withAllImages) {
  			headers['X-With-Images-Summary'] = 'true';
  		} else {
  			headers['X-Retain-Images'] = 'none';
  		}
  
  		const response = await fetch('https://r.jina.ai/', {
  			method: 'POST',
  			headers,
  			body: JSON.stringify({ url: normalizedUrl }),
  		});
  
  		if (!response.ok) {
  			return handleApiError(response, "URL conversion");
  		}
  
  		const data = await response.json() as any;
  
  		if (!data.data) {
  			return {
  				content: [
  					{
  						type: "text" as const,
  						text: "Error: Invalid response data from r.jina.ai",
  					},
  				],
  				isError: true,
  			};
  		}
  
  		const responseContent = [];
  
  
  		// Add structured data as JSON if requested via parameters
  		const structuredData: any = {};
  
  		if (data.data.url) {
  			structuredData.url = data.data.url;
  		}
  
  		if (data.data.title) {
  			structuredData.title = data.data.title;
  		}
  
  		if (withAllLinks && data.data.links) {
  			// Transform links from [anchorText, url] arrays to {anchorText, url} objects
  			structuredData.links = data.data.links.map((link: [string, string]) => ({
  				anchorText: link[0],
  				url: link[1]
  			}));
  		}
  
  		if (withAllImages && data.data.images) {
  			structuredData.images = data.data.images;
  		}
  
  		// Add structured data if any exists
  		if (Object.keys(structuredData).length > 0) {
  			responseContent.push({
  				type: "text" as const,
  				text: yamlStringify(structuredData),
  			});
  		}
  
  		// Add main content
  		if (data.data.content) {
  			responseContent.push({
  				type: "text" as const,
  				text: String(data.data.content),
  			});
  		}
  
  		return {
  			content: responseContent.length > 0 ? responseContent : [
  				{
  					type: "text" as const,
  					text: "No content available",
  				},
  			],
  		};
  	} catch (error) {
  		return {
  			content: [
  				{
  					type: "text" as const,
  					text: `Error: ${error instanceof Error ? error.message : String(error)}`,
  				},
  			],
  			isError: true,
  		};
  	}

• src/tools/jina-tools.ts:143-147 (schema)

  Input schema using Zod for validating tool parameters: url (required string URL), optional booleans for including all links and images.

  {
  	url: z.string().url().describe("The complete URL of the webpage or PDF file to read and convert (e.g., 'https://example.com/article')"),
  	withAllLinks: z.boolean().optional().describe("Set to true to extract and return all hyperlinks found on the page as structured data"),
  	withAllImages: z.boolean().optional().describe("Set to true to extract and return all images found on the page as structured data")
  },

• src/index.ts:19-22 (registration)

  In the MCP agent's init method, calls registerJinaTools to register all tools, including read_url, on the MCP server.

  async init() {
  	// Register all Jina AI tools
  	registerJinaTools(this.server, () => this.props);
  }

• src/utils/url-normalizer.ts:2-71 (helper)

  Supporting utility normalizeUrl cleans and standardizes input URLs by removing tracking params, utm, sessions, anchors, www prefix, etc., before sending to the API.

  export function normalizeUrl(urlString: string, options = {
  	removeAnchors: true,
  	removeSessionIDs: true,
  	removeUTMParams: true,
  	removeTrackingParams: true,
  	removeXAnalytics: true
  }) {
  	try {
  		urlString = urlString.replace(/\s+/g, '').trim();
  
  		if (!urlString?.trim()) {
  			throw new Error('Empty URL');
  		}
  
  		// Handle x.com and twitter.com URLs with /analytics
  		if (options.removeXAnalytics) {
  			const xComPattern = /^(https?:\/\/(www\.)?(x\.com|twitter\.com)\/([^/]+)\/status\/(\d+))\/analytics(\/)?(\?.*)?(#.*)?$/i;
  			const xMatch = urlString.match(xComPattern);
  			if (xMatch) {
  				let cleanUrl = xMatch[1];
  				if (xMatch[7]) cleanUrl += xMatch[7];
  				if (xMatch[8]) cleanUrl += xMatch[8];
  				urlString = cleanUrl;
  			}
  		}
  
  		const url = new URL(urlString);
  		if (url.protocol !== 'http:' && url.protocol !== 'https:') {
  			throw new Error('Unsupported protocol');
  		}
  
  		url.hostname = url.hostname.toLowerCase();
  		if (url.hostname.startsWith('www.')) {
  			url.hostname = url.hostname.slice(4);
  		}
  
  		if ((url.protocol === 'http:' && url.port === '80') ||
  			(url.protocol === 'https:' && url.port === '443')) {
  			url.port = '';
  		}
  
  		// Query parameter filtering
  		const searchParams = new URLSearchParams(url.search);
  		const filteredParams = Array.from(searchParams.entries())
  			.filter(([key]) => {
  				if (key === '') return false;
  				if (options.removeSessionIDs && /^(s|session|sid|sessionid|phpsessid|jsessionid|aspsessionid|asp\.net_sessionid)$/i.test(key)) {
  					return false;
  				}
  				if (options.removeUTMParams && /^utm_/i.test(key)) {
  					return false;
  				}
  				if (options.removeTrackingParams && /^(ref|referrer|fbclid|gclid|cid|mcid|source|medium|campaign|term|content|sc_rid|mc_[a-z]+)$/i.test(key)) {
  					return false;
  				}
  				return true;
  			})
  			.sort(([keyA], [keyB]) => keyA.localeCompare(keyB));
  
  		url.search = new URLSearchParams(filteredParams).toString();
  
  		if (options.removeAnchors) {
  			url.hash = '';
  		}
  
  		return url.toString();
  	} catch (error) {
  		return undefined;
  	}
  }

• src/utils/api-error-handler.ts:5-51 (helper)

  Supporting utility handleApiError returns standardized MCP error responses for common HTTP status codes (401,402,429) from the Jina API.

  export function handleApiError(response: Response, context: string = "API request") {
  	if (response.status === 401) {
  		return {
  			content: [
  				{
  					type: "text" as const,
  					text: "Authentication failed. Please set your API key in the Jina AI MCP settings. You can get a free API key by visiting https://jina.ai and signing up for an account.",
  				},
  			],
  			isError: true,
  		};
  	}
  	if (response.status === 402) {
  		return {
  			content: [
  				{
  					type: "text" as const,
  					text: "This key is out of quota. Please top up this key at https://jina.ai",
  				},
  			],
  			isError: true,
  		};
  	}
  	
  	if (response.status === 429) {
  		return {
  			content: [
  				{
  					type: "text" as const,
  					text: "Rate limit exceeded. Please upgrade your API key to get higher rate limits. Visit https://jina.ai to manage your subscription and increase your usage limits.",
  				},
  			],
  			isError: true,
  		};
  	}
  	
  	// Default error message for other HTTP errors
  	return {
  		content: [
  			{
  				type: "text" as const,
  				text: `Error: ${context} failed - ${response.status} ${response.statusText}`,
  			},
  		],
  		isError: true,
  	};
  }