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openpencil: Instructions file for Claude Code

CLAUDE.md

openpencil CLAUDE.md is an instructions file for Claude Code from ZSeven-W/openpencil. It costs 1,425 tokens per session, scanned A, original, MIT.

Repository instructions for OpenPencil, a Rust drawing product with a thin WebAssembly-based web SDK. They document its architecture, commands, coding rules, and commit conventions, including which older TypeScript code is retired.

In plain words
What is it for?
Use them to understand modules, build and test the workspace, check or format Rust and SDK code, and prepare commits that follow the repository rules.
Why use it?
They keep coding agents aligned with the current Rust codebase and stop them from relying on historical project structure.

Instructions file for Claude Code

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

This is ZSeven-W/openpencil's own configuration. It tells Claude Code how to work on openpencil 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 openpencil configures →

not rated 5.9krepo +79 today A scan 1,425 tokens original MIT
View source ↗ ZSeven-W/openpencil op.zseven.tech
About the project

OpenPencil is an open-source vector design tool where users describe interfaces in natural language and edit them on a live canvas with AI. Designers and developers use it for UI creation, design iteration, and coordinating multiple AI agents on different parts of a page. The catalogue entries provide instructions for working with OpenPencil.

ZSeven-W/openpencil · 5,875 stars · on GitHub · op.zseven.tech

Reuse

Borrowing it

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

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
[![agentmods](https://agentmods.dev/badge/instructions/zseven-w/openpencil/claude-md.svg)](https://agentmods.dev/instructions/zseven-w/openpencil/claude-md)
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<a href="https://agentmods.dev/instructions/zseven-w/openpencil/claude-md"><img src="https://agentmods.dev/badge/instructions/zseven-w/openpencil/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 1,425 This file is loaded in full into every session.
When invoked 1,425 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 $0.01425 $0.01425
Opus 5 $0.00713 $0.00713
Sonnet 5 $0.00285 $0.00285
Haiku 4.5 $0.00143 $0.00143

Measured 8d ago against content hash 1220aceffcb8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

openpencil 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 8d 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 · 77 lines

How it starts

The opening of the file, as written. The whole thing — 77 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.

The TypeScript OpenPencil has been retired. apps/web, apps/desktop, apps/cli, and the pen-* packages (pen-types/core/engine/renderer/figma/mcp/ai-skills/sdk/react/acp) are gone. The product is now implemented in Rust (crates/) with a thin wasm-backed web SDK (packages/op-web-sdk*). Historical // ported from pen-* comments in the Rust sources name the retired TS as their origin — that code no longer exists in-tree; consult git history (last TS tag v0.7.5) if you need it.

Detailed module docs load automatically in subdirectories:

  • crates/CLAUDE.md — Rust shell: crate layout, editor core, widgets, hosts (native/web/desktop), MCP, AI, orchestrator, codegen. The canonical architecture doc.
  • packages/CLAUDE.md — Remaining packages (op-web-sdk web viewer SDK family).

Commands

Tooling is Cargo (Rust — the product). The root has no package.json; the JS/Bun tooling for the web SDK lives under packages/ — run SDK/JS scripts from there.

  • Web dev server (Rust): bash scripts/start-web-rust.sh
  • Build (Rust): cargo build --workspace --release
  • Run all tests (Rust): cargo test --workspace; single crate: cargo test -p <crate>
  • Type check: cargo check --workspace; wasm: cargo check --target wasm32-unknown-unknown -p op-host-web --no-default-features --features web
  • Lint / format (Rust): cargo clippy --workspace --all-targets -- -D warnings / cargo fmt --all
  • Lint / format (remaining TS SDK): from packages/: bun run lint (oxlint) / bun run format (oxfmt)
  • Desktop app: cargo build -p op-host-desktop → binary openpencil-desktop (live MCP on 127.0.0.1:<port>/mcp)
  • CLI: cargo build -p op-cli → binary op
  • MCP server: built into the desktop/web host (--mcp <path>); crate op-mcp
  • Iconify catalog (Rust assets): from packages/: bun run generate-iconify-catalog
  • Sync all managed versions: scripts/sync-version.sh reads the canonical version from root Cargo.toml; verify without writing via tools/check-version-sync.sh

Read the full file on GitHub · 77 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. 8d ago First seen · 77 lines · 1,425 tokens per session scan A 1220aceffcb8

Subscribe to this mod's changes

openpencil CLAUDE.md is an instructions file published in the GitHub repository ZSeven-W/openpencil (5,875 stars, last pushed today), licensed MIT. It adds 1,425 tokens to every session, about $0.0071 per session on Opus 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.

CommitsGit and workflowLanguagesRustagentaifimgaopenpencilpencilui
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