What is fondation CLAUDE.md?

Claude Code instructions for Fondation, a repository with TypeScript back-end code and a database. TypeScript is a programming language that adds type checks to JavaScript.

Guiding TypeScript back-end development and database-related work in the Fondation repository.

They explain the project’s technical foundation and recommendations, helping the assistant make changes that fit its back-end and database setup.

How betagouv/fondation configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to betagouv/fondation. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/betagouv/fondation/develop/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/betagouv/fondation

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/betagouv/fondation/claude-md/github.svg)](https://agentmods.dev/instructions/betagouv/fondation/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/betagouv/fondation/claude-md"><img src="https://agentmods.dev/badge/instructions/betagouv/fondation/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/betagouv/fondation/claude-md"><img src="https://agentmods.dev/badge/instructions/betagouv/fondation/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,704 This file is loaded in full into every session.

When invoked 1,704 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.01704	$0.01704
Opus 5.5	$0.00682	$0.00682
Sonnet 5.5	$0.00341	$0.00341
Haiku 4.5	$0.00170	$0.00170

Measured 14d ago against content hash 55a79708655a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fondation CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 14d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 100 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

14d ago Changed 55a79708655a
15d ago Changed · -261 lines · -3,257 tokens per session b4581d285ab6
18d ago Changed · +3 lines · +277 tokens per session ca979c1bcb3e
22d ago Changed · +18 tokens per session 67d58ed38323
28d ago Changed · +3 lines · +232 tokens per session 0b7deed1be96
29d ago Changed · +13 tokens per session 8ac9cff89ee6
1mo ago Changed · +50 lines · +1,128 tokens per session e8acaa4ecd84
2mo ago First seen · 305 lines · 3,293 tokens per session scan A c6cc09e150c4

Subscribe to this mod's changes

fondation CLAUDE.md is an instructions file published in the GitHub repository betagouv/fondation (5 stars, last pushed 2d ago), with no licence file. It adds 1,704 tokens to every session, about $0.0068 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Backend and APIs Databases

fondation CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
fondation CLAUDE.mdbetagouv/fondation	Instructions file	5	2d ago	none	A	1,704	Claude Code
plan-forge caching.instructions.mdsrnichols/plan-forge	Instructions file	6	2d ago	MIT	A	733	GitHub Copilot
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot

fondation: Instructions file for Claude Code