On one 19-line Inkasso fee module it printed 7 findings (6 errors, 1 warning) from 5 rules, each with file:line and the 2025 value.

Who it’s for
For developers of German dunning, Inkasso and legal-billing software that compute Mahnbescheid fees.

What breaks, and when
Since 1.6.2025 (KostRÄG 2025) GKG and RVG Anlage 2 values are higher; code on the 2021 table claims too little, e.g. a 36,00 € KV 1100 minimum instead of 38,00 €.

What you get
• A scanner Claude runs over every source file - not fee values from memory

See it first
The real output of the bundled example is on getreadystack.com/skills/gkg-rvg-2025-fee-table-check/ — free, no sign-up, so you see what it finds before you pay.

Install in 30 seconds
Unzip into ~/.claude/skills/, then ask Claude Code: “Our Inkasso backend calculates the court and lawyer fees for Mahnbescheid applications and I’m not sure the tables were updated for the 2025 fee increase. Can you go through the code and tell me which fee values are out of date? Don’t edit anything yet.”. Needs Node 16+.

What it does not do
Checks fee constants only; no full bill, Auslagen, interest or VAT, and no court contact.

FAQ
Q: How is this different from asking Claude without the skill?
A: The skill carries a dated rule table and a scanner that reads every file, so Claude quotes the exact date and line instead of guessing from memory.
Q: How do I get the files?
A: In your Whop library after paying: the lesson “gkg-rvg-2025-fee-table-check.zip”.