Contracts — 1 of 20 skills in the Architect & BTP pack
Lettre-Mission
The lightweight contract for short, one-off engagements.
Install in one command
npx educasium --skill lettre-mission --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
/lettre-mission 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 lettre-mission --globalWhat you should see:
npx educasium --skill lettre-mission --global
Fetching https://raw.githubusercontent.com/Chappygo-OS/claude-meta-skills/main/dist/lettre-mission.zip
…
Installed "lettre-mission". 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.
For a feasibility study, a consultation, or a mission limited to one phase — a letter format, legally binding but concise (3-5 pages), without going through a full contract.
When to use it
For a short or one-off engagement that doesn't warrant a full contract.
Example usage
/lettre-mission Feasibility study for a rooftop addition, 4 weeks, lump sum €3,000...Download for free