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Test MCP Server

FreeNo Sign-up

Connect to any remote MCP server, explore its tools, prompts, and resources, and execute tool calls — all from your browser.

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How to Test an MCP Server

Testing an MCP server is straightforward with MCP Playground. Follow these steps:

  1. Enter the server URL - Paste the remote MCP server URL (e.g., https://mcp.example.com/sse)
  2. Add authentication - If required, enter a Bearer token for protected servers
  3. Connect - Click the connect button to establish a connection
  4. Explore capabilities - Browse available tools, prompts, and resources
  5. Test tools - Execute tools with custom parameters and see real-time responses

Need a server to test? Browse the MCP servers directory to find servers with remote URLs you can connect to.

What You Can Test

  • Tools: Execute server tools with custom arguments and view responses
  • Prompts: Retrieve and test prompt templates with variables
  • Resources: Access server resources like files, database records, or API data
  • Protocol Logs: View raw JSON-RPC messages for debugging
  • Connection Status: Monitor connection health and capabilities

Supported Transport Types

MCP Playground supports remote MCP servers using these transport protocols:

  • HTTP + SSE: Standard HTTP requests with Server-Sent Events for streaming responses
  • Streamable HTTP: Modern HTTP streaming for bidirectional communication

Note: STDIO-based servers require local installation and cannot be tested directly in the browser.

Frequently Asked Questions

Is MCP Playground free to use?
Yes! MCP Playground is completely free. Test MCP servers without any sign-up, credit card, or installation required. Just paste your MCP server URL and start testing.
Can I test local MCP servers?
MCP Playground works with remote MCP servers accessible via HTTP or SSE. For STDIO-based local servers, you'll need to use a local MCP client like Claude Desktop or Cursor IDE.
What MCP servers can I test?
You can test any MCP server with a remote URL. Popular options include Supabase MCP, GitHub MCP, Notion MCP, Playwright MCP, and many more. Browse our MCP servers list to find servers you can test.
Do I need to install anything?
No installation required! MCP Playground runs entirely in your browser. Just enter the MCP server URL, add authentication if needed, and click Connect.

Building Your Own MCP Server?

If you're developing an MCP server, use this tool to validate your implementation:

  • Verify tool schemas are correctly defined
  • Test tool execution and error handling
  • Debug protocol-level issues with the log viewer
  • Validate authentication flows

Learn more in our guide on building a custom MCP server.