skillcheck

Name: skillcheck
Author: Noem836

by Noem836version 0.1.2i★ –iRuns in the cloud

Registry nameio.github.Noem836/skillcheck

Install

Overview

Description from the maker (original English)

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

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi3 of 3 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 3 of 3 passed
Runs on the maker’s server: what you ask it goes through their server.
Can do 2 things (tools) check_skill_repo, preflight_skill
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://skillcheck-alpha.vercel.app/mcp

Run this in your terminal

claude mcp add --transport http skillcheck https://skillcheck-alpha.vercel.app/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "skillcheck": {
      "url": "https://skillcheck-alpha.vercel.app/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "skillcheck": {
      "type": "http",
      "url": "https://skillcheck-alpha.vercel.app/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://skillcheck-alpha.vercel.app/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Tool names and descriptions exactly as the server reported them on Nov 7, 2026. The maker wrote them, not us; we show them as plain text.

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, dupl
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 ski

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Noem836, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
✓ Pass
Endpoint responds
Responded in 97 ms (HTTP 200)
– Not applicable
Sign-in with OAuth
No sign-in needed
✓ Pass
No hidden instructions in tool descriptions
Read 2 tool descriptions and found no hidden instructions to the AI

Compared with others in Otheri

More stars than 0% of the other 32602 servers in this category
Published to the registry more recently than 78% of the other 32602 servers in this category
Basic checks equal to or better than 100% of the other 32602 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is skillcheck safe?

It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.2) reached the registry 10 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Rystic

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Spec Driven Development

by formulahendry

MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.

Runs on your computer★ 440MITUpdated 14 months ago

Install

Remote Desktop Commander

by desktop-commander

Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated 2 days ago

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Rystic

by Rystic-Inc

Start, seed, clock, inspect and diff Rystic API simulators from your agent.

Runs on your computerUpdated today

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

skillcheck

Find out which of your skills is stealing the request.

Your skill passed eval. Does it fire in *your* setup, next to everything else you installed?

Official skill evals load one skill in a clean environment. In real use it sits next to dozens of other skills and plugins, and one of them quietly takes the request. In the author's setup, prompts that fired 21/21 in an isolated claude plugin eval missed 5 times in the real harness.

skillcheck runs your prompts through your real claude and codex CLIs with everything you have installed, and reports which skill fired, which one stole the request, how flaky each prompt is, and whether your description fix helped.

**New: check a skill *before* you install it.** preflight tells you which of your installed skills a new one will take requests from, by running your existing skills' prompts with and without it in a throwaway folder. Your real skill folders are not touched. Word overlap only suggests suspects (a narrow skill can take requests with little shared wording), so name the skills you care about with --skills:

python3 skillcheck.py preflight path/to/new-skill            # instant: name clashes, likely rivals, listing size

python3 skillcheck.py preflight path/to/new-skill --measure # real runs: your skills' fire rate without → with it python3 skillcheck.py preflight path/to/new-skill --measure --skills my-a,my-b # pick which of yours to measure

Example report: two skills went from 0/4 and 1/4 to 4/4 after rewriting their descriptions.

Install

As a Claude Code plugin (the skillcheck skill walks you through scan → run → fix → re-run):

/plugin install skillcheck --marketplace Noem836/skillcheck

Or as one file (Python 3 standard library; PyYAML is used for frontmatter checks if installed). Pin a release and check its hash:

curl -fsSLO https://raw.githubusercontent.com/Noem836/skillcheck/v0.1.2/skillcheck.py

shasum -a 256 skillcheck.py # compare with the release notes

Use

python3 skillcheck.py scan                          # static checks, no model calls

python3 skillcheck.py gen --skills my-skill # draft should-fire / near-miss prompts → suite.json python3 skillcheck.py run --agent claude --tag before --runs 3 python3 skillcheck.py report --tag before # fire rate, false fires, who took it

edit the description, then

python3 skillcheck.py run --agent claude --tag after --runs 3 python3 skillcheck.py compare --before before --after after python3 skillcheck.py html --tag before,after # one-file HTML report python3 skillcheck.py upload --tag before,after # optional share link

For AI agents (remote MCP, no install)

A hosted, read-only MCP server runs the static checks on any public GitHub repo, which is useful before installing or publishing a skill pack:

claude mcp add --transport http skillcheck https://skillcheck-alpha.vercel.app/mcp

Tools:

preflight_skill(github_url, installed): call it before installing a skill. Pass the skills the user already has (name and description, which an agent can read from its own skill listing). It returns the name clashes that would shadow an installed skill, which installed skills the new one is most likely to take requests from, and how much the skill listing grows.
check_skill_repo(github_url) returns the frontmatter/YAML errors, name mismatches, weak or slash-only descriptions, nested SKILL.md files, duplicate names, and pairs of skills whose descriptions overlap enough to compete. Real trigger measurement still needs the CLI, because it runs in *your* setup.

What it checks

Discovery: Claude Code (~/.claude/skills, .claude/skills, enabled plugins, skillOverrides) and Codex (~/.agents/skills, ~/.codex/skills, .agents/skills)
Static: missing/broken frontmatter, name vs folder mismatch, too short/long descriptions, nested SKILL.md, slash-only wording, disable-model-invocation, duplicate names
Real triggers: each prompt run N times; the first skill loaded is recorded and the run is stopped
Competition: which other skill grabbed a should-fire prompt, and where near-miss prompts went

Safety

Prompt suites and third-party skills may contain prompt injection, so runs are locked down: Claude runs with --tools Skill only; Codex runs with --ignore-user-config, no web search, no apps/plugins, read-only sandbox. python3 check_isolation.py verifies this with a canary file.

Runs use your own CLI login and subscription. Nothing is sent anywhere unless you run upload, which sends skill names and hit/miss rows only — never prompt texts.

Report server

server.py is the share-link server (stdlib, sqlite for local runs, Vercel Blob when configured). check_web.py [url] attacks a running instance (XSS, oversized/deep JSON, slow clients, id guessing, rate-limit spoofing). Deploy on Vercel; the Dockerfile remains for self-hosting.

FAQ

Why isn't my Claude Code skill triggering? Usually another installed skill wins the request, or the description reads as slash-command only ("use as /name"). Run scan, then run + report and look at the *taken by* column. See the guide.

My skill passes `claude plugin eval` but doesn't fire in my normal setup. Why? The official eval loads the skill in a clean environment. skillcheck measures it next to everything you actually have installed.

Which of my skills is stealing requests from another? report lists, per skill, which other skill loaded on its should-fire prompts.

Does it work with Codex CLI? Yes: run --agent codex. Skill activation is read from the SKILL.md read in codex exec --json events.

How do I test SKILL.md descriptions before publishing to a marketplace? gen drafts should-fire and near-miss prompts, run measures, you edit, then compare shows before/after. The remote MCP gives a quick static check of the whole repo.

Does it send my prompts or code anywhere? No. Runs use your own CLI login locally. upload is opt-in and sends skill names and hit/miss rows only.

Limits

Claude Code and Codex only. Gemini CLI and Cursor: activation can't be read reliably yet — PRs welcome.
A run takes about a minute per prompt; 10 skills × 6 prompts × 3 runs is a few hours of subscription usage.

MIT license.

skillcheck

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Rystic

README from the maker

skillcheck

Install

Use

edit the description, then

For AI agents (remote MCP, no install)

What it checks

Safety

Report server

FAQ

Limits