MCP Tester
Connect to a Model Context Protocol server and try its tools, resources and prompts. This tool runs entirely in your browser: nothing you paste or upload leaves your device.
What MCP Tester does
MCP Tester sits in the Local AI section of Toolbox, alongside 7 related tools. It opens instantly at https://jsglobe.com/apps/mcp-tester/, keeps working offline once the page has loaded, and stores anything you save in this browser rather than on a server.
Also useful for: mcp, model context protocol, mcp inspector, mcp client, mcp server, json-rpc, tools, resources, prompts, ai agents, streamable http, sse.
How it works
- Open the page and start using it. There is no account, no sign up and no paywall.
- Everything runs as JavaScript in your own browser, so your input never reaches a server.
- Settings and saved work live in this browser and can be cleared at any time.
- The whole site is open source at https://github.com/samalstudios/jsglobe.
Questions
- Is MCP Tester free?
- Yes. MCP Tester is free to use, with no account, no sign up and no usage limits.
- Does MCP Tester upload my data?
- No. It runs entirely in your browser, so the text, files and images you give it never leave your device.
- Does MCP Tester work offline?
- Yes. Once the page has loaded, the tool keeps working without a connection.
- Where can I find the source?
- Toolbox is open source at https://github.com/samalstudios/jsglobe.
Related tools
- AI Builder - Describe a small web app and let a model in your browser write the files into a folder you choose
- AI Chat - Chat with a model running on this device
- AI Code - Explain, review, document and convert code
- AI Writer - Summarise, rewrite, translate and proofread
- Translate - Translate text with a model on this device
- AI Regex - Describe a pattern and get a tested regex
- Inspector AI - Ask questions of your own documents, answered with references