# How to integrate Opencage MCP with Vercel AI SDK v6 ```json { "title": "How to integrate Opencage MCP with Vercel AI SDK v6", "toolkit": "Opencage", "toolkit_slug": "opencage", "framework": "Vercel AI SDK", "framework_slug": "ai-sdk", "url": "https://composio.dev/toolkits/opencage/framework/ai-sdk", "markdown_url": "https://composio.dev/toolkits/opencage/framework/ai-sdk.md", "updated_at": "2026-05-12T10:20:50.267Z" } ``` ## Introduction This guide walks you through connecting Opencage to Vercel AI SDK v6 using the Composio tool router. By the end, you'll have a working Opencage agent that can get coordinates for a hotel address, find the address of given gps coordinates, return geojson for a city location through natural language commands. This guide will help you understand how to give your Vercel AI SDK agent real control over a Opencage account through Composio's Opencage MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved. ## Also integrate Opencage with - [OpenAI Agents SDK](https://composio.dev/toolkits/opencage/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/opencage/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/opencage/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/opencage/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/opencage/framework/codex) - [OpenClaw](https://composio.dev/toolkits/opencage/framework/openclaw) - [Hermes](https://composio.dev/toolkits/opencage/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/opencage/framework/cli) - [Google ADK](https://composio.dev/toolkits/opencage/framework/google-adk) - [LangChain](https://composio.dev/toolkits/opencage/framework/langchain) - [Mastra AI](https://composio.dev/toolkits/opencage/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/opencage/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/opencage/framework/crew-ai) ## TL;DR Here's what you'll learn: - How to set up and configure a Vercel AI SDK agent with Opencage integration - Using Composio's Tool Router to dynamically load and access Opencage tools - Creating an MCP client connection using HTTP transport - Building an interactive CLI chat interface with conversation history management - Handling tool calls and results within the Vercel AI SDK framework ## What is Vercel AI SDK? The Vercel AI SDK is a TypeScript library for building AI-powered applications. It provides tools for creating agents that can use external services and maintain conversation state. Key features include: - streamText: Core function for streaming responses with real-time tool support - MCP Client: Built-in support for Model Context Protocol via @ai-sdk/mcp - Step Counting: Control multi-step tool execution with stopWhen: stepCountIs() - OpenAI Provider: Native integration with OpenAI models ## What is the Opencage MCP server, and what's possible with it? The Opencage MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Opencage account. It provides structured and secure access to global geocoding services, so your agent can perform actions like translating addresses to coordinates, finding locations from GPS, converting to GeoJSON, and handling multiple output formats on your behalf. - Forward geocoding for addresses: Instantly convert human-readable addresses into precise latitude and longitude coordinates for mapping or logistics tasks. - Reverse geocoding coordinates: Give your agent raw GPS coordinates and receive the nearest human-readable address or location details. - GeoJSON feature generation: Request GeoJSON output for geocoding results, making it easy to visualize or integrate locations in mapping applications. - Flexible output formats: Get geocoding data in XML or JSONP formats, ensuring compatibility with a variety of development workflows and systems. - Seamless integration with open data sources: Tap into comprehensive and up-to-date location information sourced from open datasets for global coverage. ## Supported Tools | Tool slug | Name | Description | |---|---|---| | `OPENCAGE_GEOCODE_FORWARD` | Forward Geocode Address | Tool to convert a human-readable address into geographic coordinates. Use when you need to retrieve latitude and longitude from an address. | | `OPENCAGE_GEOCODE_GEOJSON` | Geocode to GeoJSON | Geocode addresses or coordinates and return results in GeoJSON FeatureCollection format. Use this tool when you need: - Geographic data in standard GeoJSON format for mapping applications - Forward geocoding: convert addresses to coordinates - Reverse geocoding: convert coordinates to addresses The response includes coordinates, formatted addresses, and optional annotations like timezone, currency, and sun times for each location. | | `OPENCAGE_GEOCODE_GEOJSONP` | Geocode with JSONP | Geocode an address and return results wrapped in a JavaScript callback function (JSONP format). Use this tool when you need geocoding results that can be directly consumed by JavaScript through a callback function, typically for cross-domain AJAX requests in browser environments. The response wraps standard geocoding JSON with your specified callback function name. Example response: myCallback({"results":[{"geometry":{"lat":52.5,"lng":13.4},"formatted":"Berlin, Germany",...}],...}) | | `OPENCAGE_GEOCODE_GOOGLE_V3_JSON` | Geocode Google v3 JSON | Tool to perform forward geocoding and return results in Google Geocoding API v3 compatible JSON format. Use when you need Google v3 compatible output for legacy integrations. Note: This is a legacy format that may be discontinued; using the standard JSON format is recommended. | | `OPENCAGE_GEOCODE_REVERSE` | Reverse Geocode Coordinates | Tool to convert coordinates to a human-readable address. Use when you have latitude and longitude and need a readable location. | | `OPENCAGE_GEOCODE_XML` | Geocode XML | Geocode a location query and return results in XML format. Supports both forward geocoding (address to coordinates) and reverse geocoding (coordinates to address). Use this when you need XML-formatted output instead of JSON. | | `OPENCAGE_PING_OPENCAGE` | Check API Health | Tool to check API health and connectivity. Returns 'pong' if the API is reachable. Use when you need to verify that the OpenCage API is accessible and operational. | ## Supported Triggers None listed. ## Creating MCP Server - Stand-alone vs Composio SDK The Opencage MCP server is an implementation of the Model Context Protocol that connects your AI agent to Opencage. It provides structured and secure access so your agent can perform Opencage operations on your behalf through a secure, permission-based interface. With Composio's managed implementation, you don't have to create your own developer app. For production, if you're building an end product, we recommend using your own credentials. The managed server helps you prototype fast and go from 0-1 faster. ## Step-by-step Guide ### 1. Prerequisites Before you begin, make sure you have: - Node.js and npm installed - A Composio account with API key - An OpenAI API key ### 1. Getting API Keys for OpenAI and Composio OpenAI API Key - Go to the [OpenAI dashboard](https://platform.openai.com/settings/organization/api-keys) and create an API key. You'll need credits to use the models, or you can connect to another model provider. - Keep the API key safe. Composio API Key - Log in to the [Composio dashboard](https://dashboard.composio.dev?utm_source=toolkits&utm_medium=framework_docs). - Navigate to your API settings and generate a new API key. - Store this key securely as you'll need it for authentication. ### 2. Install required dependencies First, install the necessary packages for your project. What you're installing: - @ai-sdk/openai: Vercel AI SDK's OpenAI provider - @ai-sdk/mcp: MCP client for Vercel AI SDK - @composio/core: Composio SDK for tool integration - ai: Core Vercel AI SDK - dotenv: Environment variable management ```bash npm install @ai-sdk/openai @ai-sdk/mcp @composio/core ai dotenv ``` ### 3. Set up environment variables Create a .env file in your project root. What's needed: - OPENAI_API_KEY: Your OpenAI API key for GPT model access - COMPOSIO_API_KEY: Your Composio API key for tool access - COMPOSIO_USER_ID: A unique identifier for the user session ```bash OPENAI_API_KEY=your_openai_api_key_here COMPOSIO_API_KEY=your_composio_api_key_here COMPOSIO_USER_ID=your_user_id_here ``` ### 4. Import required modules and validate environment What's happening: - We're importing all necessary libraries including Vercel AI SDK's OpenAI provider and Composio - The dotenv/config import automatically loads environment variables - The MCP client import enables connection to Composio's tool server ```typescript import "dotenv/config"; import { openai } from "@ai-sdk/openai"; import { Composio } from "@composio/core"; import * as readline from "readline"; import { streamText, type ModelMessage, stepCountIs } from "ai"; import { createMCPClient } from "@ai-sdk/mcp"; const composioAPIKey = process.env.COMPOSIO_API_KEY; const composioUserID = process.env.COMPOSIO_USER_ID; if (!process.env.OPENAI_API_KEY) throw new Error("OPENAI_API_KEY is not set"); if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set"); if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set"); const composio = new Composio({ apiKey: composioAPIKey, }); ``` ### 5. Create Tool Router session and initialize MCP client What's happening: - We're creating a Tool Router session that gives your agent access to Opencage tools - The create method takes the user ID and specifies which toolkits should be available - The returned mcp object contains the URL and authentication headers needed to connect to the MCP server - This session provides access to all Opencage-related tools through the MCP protocol ```typescript async function main() { // Create a tool router session for the user const session = await composio.create(composioUserID!, { toolkits: ["opencage"], }); const mcpUrl = session.mcp.url; ``` ### 6. Connect to MCP server and retrieve tools What's happening: - We're creating an MCP client that connects to our Composio Tool Router session via HTTP - The mcp.url provides the endpoint, and mcp.headers contains authentication credentials - The type: "http" is important - Composio requires HTTP transport - tools() retrieves all available Opencage tools that the agent can use ```typescript const mcpClient = await createMCPClient({ transport: { type: "http", url: mcpUrl, headers: session.mcp.headers, // Authentication headers for the Composio MCP server }, }); const tools = await mcpClient.tools(); ``` ### 7. Initialize conversation and CLI interface What's happening: - We initialize an empty messages array to maintain conversation history - A readline interface is created to accept user input from the command line - Instructions are displayed to guide the user on how to interact with the agent ```typescript let messages: ModelMessage[] = []; console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n"); console.log( "Ask any questions related to opencage, like summarize my last 5 emails, send an email, etc... :)))\n", ); const rl = readline.createInterface({ input: process.stdin, output: process.stdout, prompt: "> ", }); rl.prompt(); ``` ### 8. Handle user input and stream responses with real-time tool feedback What's happening: - We use streamText instead of generateText to stream responses in real-time - toolChoice: "auto" allows the model to decide when to use Opencage tools - stopWhen: stepCountIs(10) allows up to 10 steps for complex multi-tool operations - onStepFinish callback displays which tools are being used in real-time - We iterate through the text stream to create a typewriter effect as the agent responds - The complete response is added to conversation history to maintain context - Errors are caught and displayed with helpful retry suggestions ```typescript rl.on("line", async (userInput: string) => { const trimmedInput = userInput.trim(); if (["exit", "quit", "bye"].includes(trimmedInput.toLowerCase())) { console.log("\nGoodbye!"); rl.close(); process.exit(0); } if (!trimmedInput) { rl.prompt(); return; } messages.push({ role: "user", content: trimmedInput }); console.log("\nAgent is thinking...\n"); try { const stream = streamText({ model: openai("gpt-5"), messages, tools, toolChoice: "auto", stopWhen: stepCountIs(10), onStepFinish: (step) => { for (const toolCall of step.toolCalls) { console.log(`[Using tool: ${toolCall.toolName}]`); } if (step.toolCalls.length > 0) { console.log(""); // Add space after tool calls } }, }); for await (const chunk of stream.textStream) { process.stdout.write(chunk); } console.log("\n\n---\n"); // Get final result for message history const response = await stream.response; if (response?.messages?.length) { messages.push(...response.messages); } } catch (error) { console.error("\nAn error occurred while talking to the agent:"); console.error(error); console.log( "\nYou can try again or restart the app if it keeps happening.\n", ); } finally { rl.prompt(); } }); rl.on("close", async () => { await mcpClient.close(); console.log("\n👋 Session ended."); process.exit(0); }); } main().catch((err) => { console.error("Fatal error:", err); process.exit(1); }); ``` ## Complete Code ```typescript import "dotenv/config"; import { openai } from "@ai-sdk/openai"; import { Composio } from "@composio/core"; import * as readline from "readline"; import { streamText, type ModelMessage, stepCountIs } from "ai"; import { createMCPClient } from "@ai-sdk/mcp"; const composioAPIKey = process.env.COMPOSIO_API_KEY; const composioUserID = process.env.COMPOSIO_USER_ID; if (!process.env.OPENAI_API_KEY) throw new Error("OPENAI_API_KEY is not set"); if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set"); if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set"); const composio = new Composio({ apiKey: composioAPIKey, }); async function main() { // Create a tool router session for the user const session = await composio.create(composioUserID!, { toolkits: ["opencage"], }); const mcpUrl = session.mcp.url; const mcpClient = await createMCPClient({ transport: { type: "http", url: mcpUrl, headers: session.mcp.headers, // Authentication headers for the Composio MCP server }, }); const tools = await mcpClient.tools(); let messages: ModelMessage[] = []; console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n"); console.log( "Ask any questions related to opencage, like summarize my last 5 emails, send an email, etc... :)))\n", ); const rl = readline.createInterface({ input: process.stdin, output: process.stdout, prompt: "> ", }); rl.prompt(); rl.on("line", async (userInput: string) => { const trimmedInput = userInput.trim(); if (["exit", "quit", "bye"].includes(trimmedInput.toLowerCase())) { console.log("\nGoodbye!"); rl.close(); process.exit(0); } if (!trimmedInput) { rl.prompt(); return; } messages.push({ role: "user", content: trimmedInput }); console.log("\nAgent is thinking...\n"); try { const stream = streamText({ model: openai("gpt-5"), messages, tools, toolChoice: "auto", stopWhen: stepCountIs(10), onStepFinish: (step) => { for (const toolCall of step.toolCalls) { console.log(`[Using tool: ${toolCall.toolName}]`); } if (step.toolCalls.length > 0) { console.log(""); // Add space after tool calls } }, }); for await (const chunk of stream.textStream) { process.stdout.write(chunk); } console.log("\n\n---\n"); // Get final result for message history const response = await stream.response; if (response?.messages?.length) { messages.push(...response.messages); } } catch (error) { console.error("\nAn error occurred while talking to the agent:"); console.error(error); console.log( "\nYou can try again or restart the app if it keeps happening.\n", ); } finally { rl.prompt(); } }); rl.on("close", async () => { await mcpClient.close(); console.log("\n👋 Session ended."); process.exit(0); }); } main().catch((err) => { console.error("Fatal error:", err); process.exit(1); }); ``` ## Conclusion You've successfully built a Opencage agent using the Vercel AI SDK with streaming capabilities! This implementation provides a powerful foundation for building AI applications with natural language interfaces and real-time feedback. Key features of this implementation: - Real-time streaming responses for a better user experience with typewriter effect - Live tool execution feedback showing which tools are being used as the agent works - Dynamic tool loading through Composio's Tool Router with secure authentication - Multi-step tool execution with configurable step limits (up to 10 steps) - Comprehensive error handling for robust agent execution - Conversation history maintenance for context-aware responses You can extend this further by adding custom error handling, implementing specific business logic, or integrating additional Composio toolkits to create multi-app workflows. ## How to build Opencage MCP Agent with another framework - [OpenAI Agents SDK](https://composio.dev/toolkits/opencage/framework/open-ai-agents-sdk) - [Claude Agent SDK](https://composio.dev/toolkits/opencage/framework/claude-agents-sdk) - [Claude Code](https://composio.dev/toolkits/opencage/framework/claude-code) - [Claude Cowork](https://composio.dev/toolkits/opencage/framework/claude-cowork) - [Codex](https://composio.dev/toolkits/opencage/framework/codex) - [OpenClaw](https://composio.dev/toolkits/opencage/framework/openclaw) - [Hermes](https://composio.dev/toolkits/opencage/framework/hermes-agent) - [CLI](https://composio.dev/toolkits/opencage/framework/cli) - [Google ADK](https://composio.dev/toolkits/opencage/framework/google-adk) - [LangChain](https://composio.dev/toolkits/opencage/framework/langchain) - [Mastra AI](https://composio.dev/toolkits/opencage/framework/mastra-ai) - [LlamaIndex](https://composio.dev/toolkits/opencage/framework/llama-index) - [CrewAI](https://composio.dev/toolkits/opencage/framework/crew-ai) ## Related Toolkits - [Excel](https://composio.dev/toolkits/excel) - Microsoft Excel is a robust spreadsheet application for organizing, analyzing, and visualizing data. 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It helps organizations meet GDPR, CCPA, and HIPAA data privacy compliance requirements. - [Api ninjas](https://composio.dev/toolkits/api_ninjas) - Api ninjas offers 120+ public APIs spanning categories like weather, finance, sports, and more. Developers use it to supercharge apps with real-time data and actionable endpoints. - [Api sports](https://composio.dev/toolkits/api_sports) - Api sports is a comprehensive sports data platform covering 2,000+ competitions with live scores and 15+ years of stats. Instantly access up-to-date sports information for analysis, apps, or chatbots. - [Apify](https://composio.dev/toolkits/apify) - Apify is a cloud platform for building, deploying, and managing web scraping and automation tools called Actors. It lets you automate data extraction and workflow tasks at scale—no infrastructure headaches. - [Autom](https://composio.dev/toolkits/autom) - Autom is a lightning-fast search engine results data platform for Google, Bing, and Brave. Developers use it to access fresh, low-latency SERP data on demand. - [Beaconchain](https://composio.dev/toolkits/beaconchain) - Beaconchain is a real-time analytics platform for Ethereum 2.0's Beacon Chain. It provides detailed insights into validators, blocks, and overall network performance. - [Big data cloud](https://composio.dev/toolkits/big_data_cloud) - BigDataCloud provides APIs for geolocation, reverse geocoding, and address validation. Instantly access reliable location intelligence to enhance your applications and workflows. - [Bigpicture io](https://composio.dev/toolkits/bigpicture_io) - BigPicture.io offers APIs for accessing detailed company and profile data. Instantly enrich your applications with up-to-date insights on 20M+ businesses. - [Bitquery](https://composio.dev/toolkits/bitquery) - Bitquery is a blockchain data platform offering indexed, real-time, and historical data from 40+ blockchains via GraphQL APIs. Get unified, reliable access to complex on-chain data for analytics, trading, and research. - [Brightdata](https://composio.dev/toolkits/brightdata) - Brightdata is a leading web data platform offering advanced scraping, SERP APIs, and anti-bot tools. It lets you collect public web data at scale, bypassing blocks and friction. - [Builtwith](https://composio.dev/toolkits/builtwith) - BuiltWith is a web technology profiler that uncovers the technologies powering any website. Gain actionable insights into analytics, hosting, and content management stacks for smarter research and lead generation. - [Byteforms](https://composio.dev/toolkits/byteforms) - Byteforms is an all-in-one platform for creating forms, managing submissions, and integrating data. It streamlines workflows by centralizing form data collection and automation. - [Cabinpanda](https://composio.dev/toolkits/cabinpanda) - Cabinpanda is a data collection platform for building and managing online forms. It helps streamline how you gather, organize, and analyze responses. ## Frequently Asked Questions ### What are the differences in Tool Router MCP and Opencage MCP? With a standalone Opencage MCP server, the agents and LLMs can only access a fixed set of Opencage tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Opencage and many other apps based on the task at hand, all through a single MCP endpoint. ### Can I use Tool Router MCP with Vercel AI SDK v6? Yes, you can. Vercel AI SDK v6 fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Opencage tools. ### Can I manage the permissions and scopes for Opencage while using Tool Router? Yes, absolutely. You can configure which Opencage scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do. ### How safe is my data with Composio Tool Router? All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Opencage data and credentials are handled as safely as possible. --- [See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)