Ksef Fa3 Invoice Lint runs on your own machine — the client starts it, so there is no endpoint to ping. 58 installs a week from npm. Last commit 2 Nov 2026.
Finds the lines KSeF will reject in a Polish structured invoice XML, before you send it
We read the source, 6 h ago · rules 995398eba69f
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.
этот файл ставится пользователю, но в репозитории его нет
function loadMod(h, name) { try { return require(path.join(h.extDir || __dirname, name)); } catch (e) { return null; } }
ProcessBuilder pb = new ProcessBuilder(win ? "npx.cmd" : "npx", "-y", NPM, f.toString());
Found in continuous integration, deployment or infrastructure files, or in a neighbouring package of the same monorepo. None of this is installed when you add the server: it describes how the project is built and released. We list it because a leaked key in a build pipeline is still a real problem, but it is not something this server does on your machine.
o.innerHTML=s+'</table>'};
…S Firebase's defaults, and this list has no **/.* entry. Every dotfile under the public root — .env, .env.production, .npmrc, .git — is uploaded and served.","fix":"Add \"**/.*\" back to the ignore array."},
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
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.
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add ksef-fa3-invoice-lint -- npx -y @readystack/ksef-fa3-invoice-lint
{
"mcpServers": {
"ksef-fa3-invoice-lint": {
"command": "npx",
"args": [
"-y",
"@readystack/ksef-fa3-invoice-lint"
]
}
}
}
[mcp_servers.ksef-fa3-invoice-lint]
command = "npx"
args = ["-y", "@readystack/ksef-fa3-invoice-lint"]
{
"mcpServers": {
"ksef-fa3-invoice-lint": {
"command": "npx",
"args": [
"-y",
"@readystack/ksef-fa3-invoice-lint"
]
}
}
}
{
"servers": {
"ksef-fa3-invoice-lint": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@readystack/ksef-fa3-invoice-lint"
]
}
}
}
Find the lines your bank will refuse before you send the batch
Find the package.json lines that stop vsce before you run the release build
Find the ISO 20022 postal addresses your correspondent bank will repair by hand, before you send the
Finds the France-French and left-over English lines in your fr-CA locale file before an OQLF complai
Finds the Gov-Client and Gov-Vendor header mistakes HMRC rejects, in your editor, offline, before yo
Vet an agent skill before you install it: structure, triggers, secrets.
Finds the credential in your release workflow that expires before your next release
Finds the lines that make Google Play reject your release - target API below 36, Billing Library bel
Answers built from our own checks of this server.