What is claustre CLAUDE.md?

A project-specific instruction guide for Claustre, a Rust command-line, terminal, and desktop application. It documents the code structure, build and test commands, and main entities.

Use it when developing Claustre, especially when building, testing, linting, formatting, or working on its architecture and entity model.

It gives coding agents the repository rules and checks they need to make compatible changes across the shared library, command-line tools, and Tauri desktop app.

How pmbrull/claustre configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to pmbrull/claustre. 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/pmbrull/claustre/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/pmbrull/claustre

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/pmbrull/claustre/claude-md/github.svg)](https://agentmods.dev/instructions/pmbrull/claustre/claude-md)

Your own site

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

Per session 7,719 This file is loaded in full into every session.

When invoked 7,719 The same file — it is already loaded in full.

Security scan B 1 finding. 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.

Model	Per session	Once invoked
Fable 5.1	$0.07719	$0.07719
Opus 5.5	$0.03088	$0.03088
Sonnet 5.5	$0.01544	$0.01544
Haiku 4.5	$0.00772	$0.00772

Measured 2mo ago against content hash 7805de77e116, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

claustre CLAUDE.md scanned grade B with 1 finding 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 2mo 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

grep "stop_hook_summary" ~/.claude/projects/<dir>/<session>.jsonl

CLAUDE.md · 488 lines

How it starts

The opening of the file, as written. The whole thing — 488 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Claustre Development Guide

Build & Test

cargo build              # Debug build (CLI + lib)
cargo build --workspace  # Build everything including Tauri app
cargo build --release    # Release build
cargo test               # Run all tests (skills, store, config modules)
cargo test --workspace   # Run all tests including Tauri app tests
cargo clippy             # Lint (strict: clippy::all denied, pedantic warned)
cargo fmt --check        # Check formatting

The project must compile cleanly with zero clippy warnings before committing.

Tauri App

cargo build -p claustre-app   # Build the Tauri desktop app
cargo test -p claustre-app    # Run Tauri app tests

The Tauri app is at app/src-tauri/ and shares the claustre library. Launch via claustre app.

Architecture Overview

Cargo workspace with a shared library (src/lib.rs) and two binaries:

claustre (CLI + TUI) — src/main.rs
claustre-app (Tauri desktop app) — app/src-tauri/

Both binaries share the same library modules. Eleven modules, one responsibility each:

Module	Purpose
`main.rs`	CLI entry point (clap). Dispatches to TUI or subcommands
`config/`	Config loading (`config.toml`), `CLAUDE.md` merge, path helpers
`store/`	SQLite database: schema, models, CRUD queries
`tui/`	ratatui terminal UI: app state, event loop, rendering
`session/`	Git worktree lifecycle + session setup
`pty/`	Native PTY embedding via `portable-pty` + `vt100`
`skills/`	skills.sh CLI wrapper, ANSI parser
`scanner/`	Passive scanner for external Claude Code sessions
`session_host.rs`	Detached PTY owner + Unix socket server for session IPC
`update.rs`	Auto-update: GitHub release check, download, rollback

Entity Model

Read the full file on GitHub · 488 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.

2mo ago First seen · 488 lines · 7,719 tokens per session scan B 7805de77e116

Subscribe to this mod's changes

claustre CLAUDE.md is an instructions file published in the GitHub repository pmbrull/claustre (4 stars, last pushed 7mo ago), licensed MIT. It adds 7,719 tokens to every session, about $0.0309 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

claustre CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
claustre CLAUDE.mdpmbrull/claustre	Instructions file	4	7mo ago	MIT	B	7,719	Claude Code
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
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

claustre: Instructions file for Claude Code