Contracts — 1 of 20 skills in the Architect & BTP pack
Mise-En-Demeure
The graduated follow-up that actually gets invoices paid.
Install in one command
npx educasium --skill mise-en-demeure --globalPaste the command into PowerShell — the skill installs for all your projects, wherever you are.
Prerequisites: Claude Code + Node.jsHow to install themSee the 3 stepsDon't use a terminal?
Free, no account, no email — the command is all you need.
Install
/mise-en-demeure installs in 3 steps
Prerequisites: Claude Code + Node.js
The skill runs inside Claude Code, Anthropic's AI assistant installed on your computer. Node.js is the engine that runs the install command. Both are free.
Open PowerShell
Click Start, type "PowerShell", then press Enter.
Paste the command
Right-click inside the PowerShell window (or press Ctrl + V) to paste the command below, then press Enter. Wait a few seconds.
npx educasium --skill mise-en-demeure --globalWhat you should see:
npx educasium --skill mise-en-demeure --global
Fetching https://raw.githubusercontent.com/Chappygo-OS/claude-meta-skills/main/dist/mise-en-demeure.zip
…
Installed "mise-en-demeure". Restart Claude Code to pick it up.
Restart Claude Code
In Claude Code, type /restart (or quit and relaunch Claude Code). The skill now appears in the command list.
Don't use a terminal?
Using Claude.ai in your browser?
The assisted install works through a .zip file imported into Claude.ai. It takes longer and asks for your email.
What the skill does
View the source codeIn detail.
Three escalation levels — amicable reminder, formal mise en demeure (registered letter), pre-litigation — with automatic late-payment penalty and flat-fee indemnity calculation. Knows which level to stop at.
When to use it
An invoice is overdue and you need to follow up, from a polite nudge to pre-litigation.
Example usage
/mise-en-demeure Invoice F-2025-004, 10 days overdue, level 1...Download for free