Free MCP server
Give Claude (or any MCP client) 20 reliable tools for exact maths, time zones, text, encoding and developer chores. MCP (Model Context Protocol) is the open standard that lets AI apps call external tools — connect once and the model can use them whenever it needs to.
Connect in 30 seconds
0 tools exposedRun this in your terminal, then start Claude Code — the tools appear as mcp__buonnet__*.
claude mcp add --transport http buonnet "https://www.buonnet.com/api/mcp"
Scopes: the default local scope applies to the current project only.
# Personal, all projects: claude mcp add --transport http --scope user buonnet "https://www.buonnet.com/api/mcp" # Shared with your team via .mcp.json in the repo: claude mcp add --transport http --scope project buonnet "https://www.buonnet.com/api/mcp" # Check it is connected: claude mcp list
Tool catalog
Expose only the tools you need — fewer tools means better tool selection by the model. Your selection updates the server URL and every snippet above.
No tools match “”.
Live tester MCP inspector
Calls the server straight from your browser and shows the exact JSON-RPC traffic. Target: —
Test another MCP server
Any Streamable-HTTP MCP server that allows CORS and replies with JSON.
FAQ
Is it really free? Do I need an account or API key?
Yes, it is free and needs no sign-up or key. The server is stateless and read-only: every tool is a pure function (maths, time, text, encoding, developer helpers, Claude model data). Nothing is stored between calls.
What happens to the data I send?
Arguments are processed in memory to compute the result and then discarded. We do not log tool arguments beyond the standard request logs of our hosting platform. Still, never send passwords, private keys or production secrets to any third-party tool.
Are there limits?
It is a shared free service, so keep inputs reasonable (large texts are truncated) and avoid automated high-volume traffic. Timeouts are short — every tool is designed to answer in milliseconds.
Why expose only some tools?
Models pick tools more reliably when the list is short and relevant. Untick what you do not need and the server URL encodes your selection — no account required.
Can I add my own tools or prompts?
Yes. MCP Tool Studio lets you build templates, lookup tables, random pickers, pipelines and slash-command prompts. Your whole server is encoded in the URL, so there is nothing to host.