# MCP Playground — Test MCP Servers Online, Free

> A free browser-based toolkit for the Model Context Protocol. Connect to any remote MCP server, inspect and call its tools, run evals against 60+ AI models, and audit it for security issues — without installing anything.

**Source:** https://mcpplaygroundonline.com/

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## What this site is for

If you are building or consuming an MCP server, these are the questions this site answers:

- **Does my MCP server work at all?** → [MCP Server Tester](https://mcpplaygroundonline.com/mcp-server-tester) — connect, list tools/prompts/resources, call them with real arguments, watch the raw JSON-RPC.
- **Can an AI agent actually use my server?** → [MCP Evals](https://mcpplaygroundonline.com/mcp-evals) — auto-generated test suites that prove an agent can answer real questions with your tools.
- **Does it behave the same across models?** → [MCP Agent Studio](https://mcpplaygroundonline.com/mcp-agent-studio) — run the same server against 60+ models and compare tool-selection behaviour side by side.
- **Is it safe to expose?** → [MCP Security Scanner](https://mcpplaygroundonline.com/mcp-security-scanner) — 35+ checks across transport, auth, protocol compliance, injection and disclosure, graded A–F.
- **Is my MCP *client* correct?** → [MCP Test Client](https://mcpplaygroundonline.com/mcp-test-client) and [Mock MCP Servers](https://mcpplaygroundonline.com/mock-mcp-servers) — six hosted servers with public URLs, including deliberate-failure endpoints.

## Tools

- [MCP Agent Studio](https://mcpplaygroundonline.com/mcp-agent-studio) — browser AI agent over any MCP server, 60+ models, saved agents, live tool-call inspection, eval runs.
- [MCP Server Tester](https://mcpplaygroundonline.com/mcp-server-tester) — validate schemas and exercise `tools/call` before you ship.
- [MCP Inspector Online](https://mcpplaygroundonline.com/mcp-inspector-online) — the MCP Inspector without `npx`, Node, or local setup.
- [MCP Evals](https://mcpplaygroundonline.com/mcp-evals) — generated eval suites with deterministic checks plus model-graded agentic tasks.
- [MCP Security Scanner](https://mcpplaygroundonline.com/mcp-security-scanner) — graded security audit of any MCP server URL.
- [MCP Test Client](https://mcpplaygroundonline.com/mcp-test-client) — validate a client implementation against hosted mock servers.
- [Mock MCP Servers](https://mcpplaygroundonline.com/mock-mcp-servers) — six free public MCP endpoints, no sign-up.
- [MCP Agent Templates](https://mcpplaygroundonline.com/templates) — 50 ready-to-run agents for Notion, GitHub, Jira, Sentry, Stripe, Linear, Slack, Supabase and more.
- [MCP Server Registry](https://mcpplaygroundonline.com/mcp-registry) — searchable directory of MCP servers, with 37 hand-written setup pages.
- [MCP With Different AI Models](https://mcpplaygroundonline.com/mcp-model-comparison) — which models support MCP and how their tool calling differs.

## Machine-readable index

- [https://mcpplaygroundonline.com/llms.txt](https://mcpplaygroundonline.com/llms.txt) — curated index of every tool and guide.
- [https://mcpplaygroundonline.com/llms-full.txt](https://mcpplaygroundonline.com/llms-full.txt) — the tool pages and top guides inlined in full.
- Append `.md` to any blog or server-page URL, or send `Accept: text/markdown`, for a clean Markdown rendering.

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_Canonical page: https://mcpplaygroundonline.com/_

_MCP Playground (mcpplaygroundonline.com) is a free, browser-based toolkit for the Model Context Protocol: test any remote MCP server, run evals that prove an AI agent can use its tools, build reusable agents across 60+ models, and audit servers for security issues. No install, no local Node, free to start._