MCP Playground Online is a browser-based studio for building, testing, and running AI agents on top of MCP (Model Context Protocol) servers.
No SDKs to install. No local configuration. No infrastructure to manage.
What is MCP Playground Online?
MCP Playground Online is a free, browser-based platform for building, testing, and deploying AI agents that use the Model Context Protocol (MCP). It takes MCP server URLs (HTTP, SSE, Streamable HTTP) or local stdio commands as input and produces a live chat interface where users can invoke tools, compare AI model responses, and export agents as production APIs. The platform is developed by the MCP Playground team and runs entirely in the browser with no local setup required.
Key Features
- MCP Agent Studio — Build and test multi-server agents in a chat interface; connect up to four MCP servers simultaneously with automatic tool merging.
- AI Model Comparison — Run one prompt across up to four AI models (Claude, GPT, Gemini, Grok, DeepSeek, Qwen, GLM, MiniMax, Kimi, and 30+ others) side-by-side; winner ribbons flag fastest, cheapest, and most accurate.
- Live JSON Inspector — View full JSON-RPC request/response logs for every tool call, including per-call latency and credit cost.
- Hosted MCP Servers — Deploy 50+ ready-to-run servers (GitHub, Slack, Notion, Linear, Stripe, Playwright, MongoDB, Elasticsearch, Postgres) with a live HTTPS endpoint and bearer token in one click.
- Export Agents as APIs — Save any agent (servers, model, system prompt) and generate a stable REST endpoint with bearer auth for production use.
- Free MCP Tools — No-signup tools including an MCP Test Client, MCP Security Scanner, MCP Config Generator (for Claude Desktop, Cursor, Cline), MCP Token Counter, and a server directory of 10,000+ servers.
Who is it for?
- AI developers who want to prototype multi-server agents without local setup — they can connect to any MCP server, test tool calls, and iterate on prompts in the browser.
- MCP server maintainers who need to validate server implementations — they can connect their server, list tools, execute commands, and inspect raw JSON-RPC traffic in real time.
- Product teams evaluating AI models for their use case — they can compare up to four models head-to-head on the same prompt to find the fastest, cheapest, or most accurate option.
- DevOps engineers deploying production AI workflows — they can turn any tested agent into a production API with a REST endpoint and API key.
What can you do with MCP Playground Online?
- Build a multi-server code review agent: Connect GitHub and Slack MCP servers, set Claude as the model, and ask it to review open issues and post summaries to Slack. Try templates for GitHub code review, Stripe billing support, Notion knowledge retrieval, and more.
- Compare AI model responses for a tool call: Run a prompt like “Show top 5 open issues” across GPT-5.4 nano and Claude Sonnet 4.5. See latency and cost side-by-side, then pick the winner and use it for your agent.
- Deploy a hosted MCP server for MongoDB: One-click deploy a MongoDB MCP server with an HTTPS endpoint and bearer token. Connect it to the Agent Studio and start querying your database through natural language.
- Test a custom MCP server: Navigate to the MCP Test Server page, enter your server URL, click Connect, then browse tools, invoke them, and inspect every request/response log.
How does MCP Playground Online work?
- Go to the MCP Agent Studio or MCP Test Server page.
- Enter one or more MCP server URLs (HTTP/SSE/Streamable HTTP) or select from hosted servers.
- Optionally choose an AI model from 40+ options for agent interaction.
- Start chatting: type a prompt, and the platform calls the appropriate tools, showing live logs, latency, and cost.
- Save and export the agent as an API if needed.
Pricing
MCP Playground Online is free to use for testing and development. MCP Agent Studio offers free credits on sign-up with no credit card required. Detailed pricing tiers are not listed on the site.
FAQ
Is MCP Playground Online free?
Yes, the core testing tools (MCP Test Server, MCP Test Client, Security Scanner, Config Generator, Token Counter, and Server Directory) are completely free with no sign-up required. The MCP Agent Studio offers free credits on sign-up — no credit card needed.
Do I need to install anything?
No installation is required. Everything runs in your browser. The hosted MCP servers are deployed on the platform; you only need a browser.
What MCP protocols are supported?
The platform supports HTTP, SSE (Server-Sent Events), Streamable HTTP, and local stdio/CLI connections. You can connect up to four servers simultaneously in the Agent Studio.
Can I deploy my own MCP server?
Yes, you can deploy 50+ ready-to-run MCP servers (e.g., GitHub, Slack, Postgres, MongoDB) with one click. Each deployment includes a live HTTPS endpoint and bearer token. No Docker, npx, or port forwarding required.
How many AI models can I compare?
You can compare up to four AI models side-by-side from a selection of 40+ models including Claude, GPT, Gemini, Grok, DeepSeek, Qwen, GLM, MiniMax, and Kimi. The platform automatically flags the fastest, cheapest, and most accurate response.
Explore the MCP Server Directory with 10,000+ servers, browse tutorials and recipes, or start building with the MCP Agent Studio.
