ToolFit + MCPCheck MCP Server

by youraitools Your server? Claim it

answering

ToolFit + MCPCheck is answering right now. Last checked 4 min ago. It exposes 6 tools.

Audit, pin and diff agent tool lists; preflight and watch remote MCP servers. Free tier; x402.

Uptime history 22 hours of history

22 hours agonow

100.0%

Uptime 24h

83 of 83 checks

Tools

read from the server

92 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check ToolFit + MCPCheck every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add toolfit --transport http https://api.youraitools.co/toolfit/mcp

Settings → Connectors → Add custom connector, then paste this address

https://api.youraitools.co/toolfit/mcp

~/.codex/config.toml

[mcp_servers.toolfit]
url = "https://api.youraitools.co/toolfit/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "toolfit": {
      "url": "https://api.youraitools.co/toolfit/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "toolfit": {
      "type": "http",
      "url": "https://api.youraitools.co/toolfit/mcp"
    }
  }
}

Available tools 6

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

watch

watch_cancel

Free: cancel a watch (no further checks or webhooks; not refunded). Needs watch_id and the secret returned when it was created.

watch_mcp_server

Hosted watch (paid only; this MCP call validates and returns how to pay): ToolFit re-audits a public remote MCP server every 24 h ($0.25) or 6 h ($0.60) for 30 days and POSTs an HMAC-SHA256 signed JSON webhook to your https endpoint when its tools/list fingerprint or grade changes, or it goes unreachable or recovers. Pay at POST /v1/watch or /v1/watch/6h with x402 or a credits key; the response has watch_id and the signing secret (shown once).

watch_status

Free: state (active, expired, cancelled), interval, expiry, next check, last result (pin, grade, score, tool count) and webhook delivery counters for a watch. Needs watch_id and the secret returned when it was created.

audit

audit_tools

Check the tool definitions an agent loads, before they cost tokens or fail: estimated tokens per tool, schema errors per provider (OpenAI, Anthropic, Gemini, Bedrock, MCP; add openai_strict for strict mode) with JSON paths and fixed definitions, tool pairs models will confuse with fix hints, basic poisoning patterns, a grade and a pin (set_id) for diff_tools. Pass "tools" (array in any common format) or "url" (public remote MCP server; tools are listed, never called). level "lite" returns the summary only. Free: 20 calls/day per IP (shared with diff_tools), then $0.003 lite / $0.01 full via x402 or credits.

diff

diff_tools

What changed in a tool list since you approved it? Compares "tools" or "url" now with "pin" (set_id from audit_tools/diff_tools) or "baseline" (earlier definitions). Each change is labeled breaking (removed tool or param, new required param, type or enum removal), suspicious (new text with injection patterns or hidden characters), review (description, title, annotation or new tool) or additive; descriptions come with before/after text and a word diff. Returns a new pin. Free: 20 calls/day per IP (shared with audit_tools), then $0.002 via x402 or credits.

mcp

check_mcp_server

Does this remote MCP server work, and is it worth connecting or paying for? Sends initialize and tools/list only (never calls a tool) and reports reachability, protocol version, sign-in method (OAuth protected-resource metadata), x402 payment terms if it asks for payment, latency, tool count and token cost, provider compatibility, poisoning patterns in tools and server instructions, issues and a grade A-F, plus a pin for later diffs. https public hosts only. Free: 10 checks/day per IP, then $0.005 via x402 or credits.

Endpoints

URL	Transport	State	Latency	Checked
https://api.youraitools.co/toolfit/mcp	streamable-http	answering	72 ms	4 min ago

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ToolFit + MCPCheck — questions

Answers built from our own checks of this server.

What can ToolFit + MCPCheck do?

It exposes 6 tools, read directly from the server on our last check. Among them: audit_tools, check_mcp_server, diff_tools, watch_cancel, watch_mcp_server, watch_status. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is ToolFit + MCPCheck working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 83 of 83 checks got a reply (100.0%), average response time 92 ms. The bar chart above shows every period we have measured.

How do I connect ToolFit + MCPCheck?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does ToolFit + MCPCheck need an API key?

No. ToolFit + MCPCheck completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 6 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is ToolFit + MCPCheck?

It answers our handshake in 92 ms on average, which is faster than 97% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.