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Crane: Instructions file for Claude Code

CLAUDE.md

Crane CLAUDE.md is an instructions file for Claude Code from rajpootathar/Crane. It costs 3,674 tokens per session, scanned A, original, MIT.

Project rules for Crane, a Rust desktop development environment with a graphical interface and built-in terminal.

In plain words
What is it for?
Use them when adding or changing Crane features, especially projects, workspaces, terminal behavior, panels, Git integration, or desktop interface code.
Why use it?
They define the approved technology choices, naming, architecture, and terminology contributors must follow.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: reads .claude/ paths; mentions CLAUDE.md.

This is rajpootathar/Crane's own configuration. It tells Claude Code how to work on Crane 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 Crane configures →

not rated 20repo 29d ago A scan 3,674 tokens original MIT
View source ↗ rajpootathar/Crane
Reuse

Borrowing it

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

Made for: Claude Code.

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Per session 3,674 This file is loaded in full into every session.
When invoked 3,674 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 $0.03674 $0.03674
Opus 5.5 $0.01470 $0.01470
Sonnet 5.5 $0.00735 $0.00735
Haiku 4.5 $0.00367 $0.00367

Measured 2mo ago against content hash 9110c819382d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Crane 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 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.

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 · 227 lines

How it starts

The opening of the file, as written. The whole thing — 227 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Crane — Project Ruleset

Native GPU-rendered desktop development environment built in pure Rust with egui/wgpu.

Tech stack

  • Language: Rust edition 2024
  • GUI: eframe 0.34 + egui 0.34 + wgpu backend
  • Terminal: in-house crane_term crate (crates/crane_term) wrapping vte 0.15 (parser only) + portable-pty 0.9 (cross-platform PTY). Owns the grid, scrollback, ?2026 sync replay, and resize reflow. Replaced alacritty_terminal end-to-end on the feat/crane-term branch.
  • Concurrency: parking_lot mutexes, std::thread for PTY reader; no async runtime
  • Git: shell out to the git binary via std::process::Command — never git2, never libgit2
  • Text / markdown / diff: syntect (syntax highlighting), pulldown-cmark (markdown), similar (diff)
  • File dialogs: rfd (native folder/file pickers)
  • Icon: loaded from crane.png via image crate, set as app icon via ViewportBuilder::with_icon

Naming glossary (canonical — do not drift)

Regions (top-level screen areas):

  • Left Panel — projects tree
  • Main Panel — active Tab's Layout of Panes
  • Right Panel — Changes / Files

Hierarchy:

  • Project — a git repo on disk. Contains 1+ Workspaces.
  • Workspace — a branch checkout of a Project, backed by git worktree add under ~/.crane-worktrees/<project-name>/<branch> by default (user can override location). Contains 1+ Tabs.
  • Tab — a named surface in the Main Panel. Owns one Layout.
  • Layout — the split tree inside a Tab (what ⌘D / ⌘⇧D splits).
  • Pane — a leaf in a Layout; one of: Terminal, Files, Markdown, Diff, Browser.
  • File Tab — an open file inside the Files Pane. Internal-only term — never at the top level.

Code still uses the old names Workspace (for the Layout struct) and Worktree (for the Workspace struct); rename is agreed but not yet executed.

Architecture

Single binary, single process. No FFI, no Go, no subprocesses other than git.

crate::app vs warpui — two names, two things

Read the full file on GitHub · 227 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. 2mo ago First seen · 227 lines · 3,674 tokens per session scan A 9110c819382d

Subscribe to this mod's changes

Crane CLAUDE.md is an instructions file published in the GitHub repository rajpootathar/Crane (20 stars, last pushed 29d ago), licensed MIT. It adds 3,674 tokens to every session, about $0.0147 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 2026-08-30.

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