Is Ksef safe and trustworthy?

tashan scores Ksef on public evidence — it is currently active. Audit scope: OSV advisories, install-time scripts, build provenance and declared permission surface. We do not review source code or execute the capability.

How do I install Ksef?

Drop the skill folder into ~/.claude/skills/ (user scope) or .claude/skills/ (project scope).

4 GitHub contributors, source: Flopsstuff/flugins.

‹ The Index

Ksef

skill

- Use when the user wants to work with the Polish National e-Invoice System (KSeF): send an invoice (faktura), find/query/download invoices, download a UPO receipt, check invoice status, set up or install the ksef tool, log in to KSeF, or fix KSeF errors (401 unauthorized, 440 duplicate invoice). Triggers: KSeF, faktura, e-faktura, e-invoice, FA3, UPO, NIP, KSeF token, invoice send/query, "wyślij fakturę", "pobierz fakturę".

Works with: Claude Code (native) · Cursor, Codex CLI (manual)
native: this artifact type is that client's own format

Category: Dev Tools & CI — see all ranked ›

Install (Claude Code):

cp -r ksef ~/.claude/skills/

Adoption: 1 repos
Upkeep: 95.0
Freshness: 89.0
Evidence coverage: 84% of the inputs this score can use — the rest are unknown, and the score is discounted for it
Health: active
Contributors: 4
License: MIT

Security audit

Not scanned yet. We audit npm-published capabilities for known advisories, install-time scripts and permission surface; this one has no npm package we can resolve, or has not reached the queue.

Its own instructions

Its SKILL.md says when to use it, shows worked examples and covers setup.

Read from the capability’s own SKILL.md. This is not a grade and does not compare to the instruction-depth verdict on an MCP server — a skill has no tools to document, so that rubric does not apply to it.

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Reads the config already on your machine and names what is dead, deprecated or running code at install time. No account, nothing uploaded.

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Every score since we started measuring, for any capability
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source ↗ · skill:Flopsstuff/ksef

Everything on this page is public evidence and free. What it cannot know is whether you run this — check your whole config, free, in the browser. tashan Pro adds the series behind each row and names a replacement for anything dying.

Already running this? Check your whole config — free, in your browser, nothing installed. Or npx tashan-cli doctor locally, which sends nothing at all.

Measured 2026-08-22 · scorer s5 · how · something wrong here?