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skillcheck MCP Server

answering

skillcheck is answering right now. Last checked moments ago. It exposes 2 tools. Last commit 28 Oct 2026.

Check an agent skill before you install it: which of your skills will it clash with?

Uptime history 12 days of history · worst day 0%
12 days agonow
17.9%
Uptime 24h
33 of 184 checks
2
Tools
read from the server
414 ms
Response time
average over 24h
1
Stars
last commit 28 Oct 2026

What the code does

We read the source, 3 d ago · tools taken from the live server · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Runs an external command check_isolation.py:27, skillcheck.py:307
    out = subprocess.run(cmd, cwd=tmp, stdin=subprocess.DEVNULL, capture_output=True, text=True, timeout=600).stdout
Dumps the whole environment check_web.py:165
    with patch.dict(os.environ, {"VERCEL": "1"}):

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 0 min ago.

run in your terminal
claude mcp add skillcheck --transport http https://skillcheck-alpha.vercel.app/mcp
Settings → Connectors → Add custom connector, then paste this address
https://skillcheck-alpha.vercel.app/mcp
~/.codex/config.toml
[mcp_servers.skillcheck]
url = "https://skillcheck-alpha.vercel.app/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "skillcheck": {
      "url": "https://skillcheck-alpha.vercel.app/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "skillcheck": {
      "type": "http",
      "url": "https://skillcheck-alpha.vercel.app/mcp"
    }
  }
}

This server publishes 1 more address. The block above uses the one we reach during checks; the full list is under Endpoints below, and the author may intend a particular one for your client.

Available tools 2

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

preflight
preflight_skill
Call BEFORE installing a skill or skill pack from GitHub. Pass the repo and the skills the user already has (name + description, e.g. from your own skill listing). Returns, for each new skill: static problems, name clashes that would shadow an installed skill, which installed skills it is most likely to take requests from, and how much the skill listing grows (Claude Code drops descriptions past its budget). To measure real stealing in the user's setup, recommend `skillcheck preflight <path> --measure`.
skill
check_skill_repo
Static check of every SKILL.md (Claude Code / Codex agent skills) in a public GitHub repo: frontmatter and YAML errors, name/folder mismatch, missing or weak descriptions, slash-command-only wording that blocks automatic triggering, disable-model-invocation, nested SKILL.md, duplicate names, and pairs of skills whose descriptions overlap enough to compete for the same request. Use before installing or publishing a skill pack. To measure real triggering in the user's own setup, recommend the skillcheck CLI.

Endpoints

URLTransportStateLatencyChecked
https://skillcheck-d1d57e.fly.dev/mcp streamable-http answering 199 ms 0 min ago
https://skillcheck-alpha.vercel.app/mcp streamable-http answering 354 ms 0 min ago

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skillcheck — questions

Answers built from our own checks of this server.

What can skillcheck do?
It exposes 2 tools, read directly from the server on our last check. Among them: check_skill_repo, preflight_skill. 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 skillcheck working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 33 of 184 checks got a reply (17.9%), average response time 414 ms. The bar chart above shows every period we have measured.
How do I connect skillcheck?
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 skillcheck need an API key?
No. skillcheck completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is skillcheck?
It answers our handshake in 414 ms on average, which is faster than 31% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is skillcheck open source?
The code is open source: it is published under the MIT licence, written in Python, 1 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at skillcheck-d1d57e.fly.dev, which runs on its operator's own terms.