socket.help vs MCP Inspector
They solve opposite sides of MCP testing. socket.help gives you hosted mock MCP servers plus a browser check of a public server’s tools. MCP Inspector is the official local client for connecting to, calling, and debugging a server.
Choose by your workflow.
Choose socket.help when your MCP client or agent needs a predictable server to call, or when you want a quick look at a public server’s tools without installing anything.
- Your MCP client needs a predictable server to call
- You want to test how an agent handles tool errors and latency
- You want to check a public server’s tools without installing anything
- You need to read a saved MCP trace offline
Choose MCP Inspector when you are building an MCP server and need to call tools, read resources, render prompts, and watch the JSON-RPC traffic, including for local stdio servers.
- You are building an MCP server and need to call its tools
- The server runs locally over stdio
- You need OAuth, resource subscriptions, or prompt rendering
- You want the raw JSON-RPC and HTTP traffic
The differences that matter.
| Area | socket.help | MCP Inspector |
|---|---|---|
| Role | Hosted mock MCP servers with configurable tools, plus a read-only inspector for public servers. | A client that connects to your server, with web, CLI, and terminal interfaces. |
| Where it runs | In the browser, with no installation. | Locally through npx; requires Node 22.19.0 or newer. |
| Transports | Public Streamable HTTP endpoints only. | Local stdio servers and remote HTTP or SSE servers. |
| Inspection depth | Lists tools, resources, or prompts and their schemas. Does not call tools or read resources. | Calls tools, reads and subscribes to resources, renders prompts, and shows protocol and network traffic. |
| Authorization | Bearer token or X-* headers. No OAuth login. | Full OAuth flow, plus custom headers. |
Where socket.help stops.
The socket.help MCP server inspector does not invoke tools, read resource contents, sign in with OAuth, or connect to local stdio servers, and it supports protocol versions up to 2025-11-25. Mock MCP servers return static responses for up to 10 tools.
The catalog includes planned tools, clearly marked Coming soon. Those tools cannot be used yet. Check the published allowances for storage, rate limits, and retention before choosing a workflow.
Frequently asked questions
How do I run the MCP Inspector?
Run npx @modelcontextprotocol/inspector with Node 22.19.0 or newer. It opens a web interface; --cli and --tui flags start the command-line and terminal clients.
Can I test an MCP server online without installing anything?
Yes, for public Streamable HTTP servers. socket.help’s MCP server inspector lists a server’s tools, resources, or prompts and schemas in the browser, but it does not call tools.
How can I test an MCP client without a real server?
Create a socket.help mock MCP server with up to 10 tools and static responses, then connect your client to its Streamable HTTP endpoint. The tool failure simulator returns controlled errors and delays.
Is the MCP Inspector open source?
Yes. MCP Inspector is published as @modelcontextprotocol/inspector, and its source is on GitHub under the modelcontextprotocol organization.
Check the sources.
Reviewed on against official documentation. Features can change. This page is written by socket.help and is not an endorsement by MCP Inspector.