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Mastra is a TypeScript framework for building AI agents. It provides first-class MCP support through its MCPClient class. By connecting Context7 as an MCP server, your Mastra agents can access up-to-date library documentation, enabling them to generate accurate code and answer technical questions with current API references. For more details on how Mastra handles MCP, see the Mastra MCP documentation.

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Setup

1

Install the MCP Package

Add the Mastra MCP package to your project:
npm install @mastra/mcp@latest
2

Create an MCP Client

Configure an MCPClient that connects to Context7:
import { MCPClient } from "@mastra/mcp";

const context7 = new MCPClient({
  id: "context7",
  servers: {
    context7: {
      url: new URL("https://mcp.context7.com/mcp"),
      requestInit: {
        headers: {
          CONTEXT7_API_KEY: process.env.CONTEXT7_API_KEY!,
        },
      },
    },
  },
});
Set CONTEXT7_API_KEY in your environment with your API key from the Context7 dashboard.
3

Connect to Your Agent

Pass the Context7 tools to your Mastra agent:
import { Agent } from "@mastra/core/agent";

const agent = new Agent({
  id: "coding-assistant",
  name: "Coding Assistant",
  instructions: "You are a helpful coding assistant with access to up-to-date library documentation via Context7.",
  model: "anthropic/claude-sonnet-4-6",
  tools: await context7.listTools(),
});

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How It Works

Once connected, your Mastra agents will query Context7 for relevant library documentation. This helps agents:
  • Answer technical questions with accurate, up-to-date API references
  • Generate code that follows current library patterns and best practices
  • Avoid hallucinating outdated or incorrect API usage
  • Provide version-specific guidance for any supported library