MCP Playground

MCP Playground is a free browser-based testing tool for the Model Context Protocol. It is meant for testing MCP servers, clients, and tools directly in the browser, with no installation or configuration required. The service is aimed at developers and is described as a way to validate protocol implementations, test tools before deployment, and explore MCP servers and resources.

The site supports connecting to remote MCP servers from a browser and browsing their tools, prompts, and resources. It offers real-time request and response logs, full request/response JSON for each tool call, per-call latency, and credit cost details. The page also mentions an MCP Security Scanner, an MCP Token Counter, a Config Generator, MCP Tutorials, and MCP Recipes. In addition, the MCP Agent Studio lets users build, test, and ship MCP-powered AI agents in the browser, compare up to four AI models in parallel, and export an agent as a production API with bearer authentication and a server-side locked prompt.

Transport support includes HTTP, SSE, Streamable HTTP, and local stdio/CLI processes. The site says users can connect up to four servers at once in one chat, with tools merged automatically, and that agents can be saved and reused as named configurations. It also lists browsing 10,000+ MCP servers, including Supabase, Playwright, Figma, and GitHub, and says users can add any server with one click. For local tools, it mentions running npx or uvx alongside remote HTTP servers and injecting environment variables for authentication in the UI.

MCP Playground is described as free, with no sign-up or credit card needed, and the Agent Studio mentions free credits on sign-up. The page also says features remain free and no registration is required. It presents itself as a browser-based MCP testing tool rather than a desktop app or local install.