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SimpleModule: Instructions file for Claude Code

CLAUDE.md

SimpleModule CLAUDE.md is an instructions file for Claude Code from antosubash/SimpleModule. It costs 3,652 tokens per session, scanned A, original, MIT.

A repository instruction file for SimpleModule, a .NET modular monolith framework with a React frontend and local database guidance. It records project-specific coding, attribution, build, and run rules.

In plain words
What is it for?
It is for following the repository's .NET, React, database, shared services, and commit-attribution rules.
Why use it?
It gives a coding agent the project context and local development constraints needed to work in this repository without conflicting with its setup.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions subagents; mentions Claude Code.

This is antosubash/SimpleModule's own configuration. It tells Claude Code how to work on SimpleModule itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything SimpleModule configures →

not rated 5repo 19d ago A scan 3,652 tokens original MIT
View source ↗ antosubash/SimpleModule app.simplemodule.dev
Reuse

Borrowing it

Nothing to install: this file belongs to antosubash/SimpleModule. 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/antosubash/SimpleModule/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/antosubash/SimpleModule

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
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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.

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Per session 3,652 This file is loaded in full into every session.
When invoked 3,652 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 original 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.03652 $0.03652
Opus 5.5 $0.01461 $0.01461
Sonnet 5.5 $0.00730 $0.00730
Haiku 4.5 $0.00365 $0.00365

Measured 1mo ago against content hash e818171ca70a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

SimpleModule 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 1mo 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 · 314 lines

How it starts

The opening of the file, as written. The whole thing — 314 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Attribution Policy

  • Never add "Co-authored-by: Claude" or any Claude/AI attribution to git commits
  • Never add comments like "Generated by Claude", "AI-generated", or similar in source code
  • Never list Claude as a contributor in any file (package.json, csproj, README, etc.)
  • All commits should appear as authored solely by the developer — do not modify git author/committer config
  • Do not append the claude.ai session URL to commit messages

What This Is

Modular monolith framework for .NET with compile-time module discovery via Roslyn source generators. Frontend uses React 19 + Inertia.js served via a static HTML shell.

Local database (shared dev-services stack)

Do NOT start your own Postgres container. All repos in ~/Repos share one stack defined in ~/Repos/dev-services (one PostGIS + Redis + MinIO + Adminer on the devnet Docker network). Start it once with make up there.

  • Local dev defaults to SQLite (app.db), so Postgres is optional here.
  • To use Postgres, point the app at the shared server: localhost:5432, postgres/postgres, database simplemodule (already created by the shared stack's init SQL).
  • This repo's own docker-compose.yml starts a postgres:17 container (db simplemodule, creds simplemodule/simplemodule). Prefer the shared stack and skip it — running both conflicts on port 5432. Running via the Aspire AppHost also provisions its own Postgres (simplemoduledb); that's a separate path from the shared stack.

If 5432 is taken by an old per-project container, stop that container rather than remapping ports. To add a database, edit dev-services/init/01-databases.sql.

Build & Run

dotnet build
dotnet run --project template/SimpleModule.Host     # runs on https://localhost:5001

Frontend (npm workspaces)

npm install                          # install all workspace dependencies
npm run dev                          # start development (dotnet + all module watches, unminified JS)
npm run build:dev                    # build all modules in dev mode (unminified, with source maps)
npm run build                        # production build (minified, optimized)
npm run check                        # biome lint + format check
npm run check:fix                    # auto-fix lint + formatting
npm run lint                         # lint only
npm run format                       # format only (with write)

Read the full file on GitHub · 314 lines

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.

  1. 1mo ago First seen · 314 lines · 3,652 tokens per session scan A e818171ca70a

Subscribe to this mod's changes

SimpleModule CLAUDE.md is an instructions file published in the GitHub repository antosubash/SimpleModule (5 stars, last pushed 19d ago), licensed MIT. It adds 3,652 tokens to every session, about $0.0146 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 2026-09-04.

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