Works with the AI tools you already use
Claude Code
Cursor
Codex CLI
Muse
Dots+22 moreClaude CodeCursorCodex CLIMuseDots
OpenClaw
Manus
Grok
Grok Bot+18 agentsNex Einvoice pl
Technical implementation guide for Polish KSeF e-invoicing, FA(3) schemas, and API onboarding.
Free
nex-einvoice-pl
Example session with this skill installed
Provide the FA(3) field mapping for a correction invoice (korekta) where the error was present from the start.
- Read your context and instructions
- Compiled the nex-einvoice-pl
Set RodzajFaktury to 'KOR'. Under the Naglowek node, use WariantFormularza 3. In the Fa node, set TypKorekty to 'A' (error from start) and provide the mandatory PrzyczynaKorekty. You must include the DaneFaKorygowanej section referencing the original invoice's KSeF number.
Connects securely to your tools. The creator never sees your data.
About this skill
The problem
Integrating Polish KSeF (Krajowy System e-Faktur) is more than just XML mapping. Developers must manage a clearing model where invoices only legally exist once assigned a central KSeF number, requiring specific authentication flows and offline contingency logic.
What it does
- Generates readiness checklists based on taxpayer category, gross sales, and VAT status.
- Provides FA(3) schema field structures for standard, correction (korekta), and advance (zaliczkowa) invoices.
- Outlines onboarding workflows for KSeF 2.0 API environments across test, demo, and production.
- Defines offline24 contingency procedures, including mandatory QR code rules and submission windows.
- Flags critical 2026 deadlines for penalty grace periods and token expiration.
Frameworks & tools
KSeF 2.0 API, FA(3) XML Schema, MCU module (Moduł Certyfikatów i Uprawnień), and ZAW-FA filing protocols.
Why this beats prompting it yourself
Generic LLMs often confuse KSeF clearing with Peppol exchange models. This skill enforces the specific FA(3) hierarchy, legal issuance dates based on transmission, and the technical requirements for Type 2 certificates needed for offline QR codes.
Use cases
- Map legacy ERP data fields to the mandatory FA(3) XML structure.
- Build a recovery workflow for the offline24 mode and system failures.
- Determine the exact compliance deadline for a specific Polish entity or branch.
- Configure authentication using KSeF certificates, seals, or tokens before the 2027 cutoff.
Known limitations
Requires a KSeF certificate for offline24 modes. Commercial attachments like PDFs must be sent out-of-band as the Zalacznik node is restricted to structured tax data.
How to install
Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.
- 1
Download the ZIP
Free skills download straight away. Paid skills unlock right after purchase.
- 2
Unzip into your skills folder
Every agent reads skills from one folder on your machine. Drop the unzipped folder in there.
- 3
Ask your agent to use it
Restart the agent if it was already running. It picks the skill up automatically - no config needed.
Skills folder by agent
Click the path to copy it. Create the folder if it does not exist yet.
Reviews
No reviews yet
Be one of the first to try it. Every listed skill passes our trust checks below.
Security scanned
Passed our 8-point scan before listing
1 install
Downloaded by developers to date
Free forever
No account required to browse
Trust & safety
Security scanned
Verified clean 1 month ago
- Free to download with an account
Needs access to
Gov
Nex Ai