Borrowing it
Nothing to install: this file belongs to ultrathink-art/agentbrush. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/ultrathink-art/agentbrush/main/CLAUDE.mdgit clone --depth 1 https://github.com/ultrathink-art/agentbrushWrote 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.
[](https://agentmods.dev/instructions/ultrathink-art/agentbrush/claude-md)<a href="https://agentmods.dev/instructions/ultrathink-art/agentbrush/claude-md"><img src="https://agentmods.dev/badge/instructions/ultrathink-art/agentbrush/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.
<a href="https://agentmods.dev/instructions/ultrathink-art/agentbrush/claude-md"><img src="https://agentmods.dev/badge/instructions/ultrathink-art/agentbrush/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00523 | $0.00523 |
| Opus 5 | $0.00262 | $0.00262 |
| Sonnet 5 | $0.00105 | $0.00105 |
| Haiku 4.5 | $0.00052 | $0.00052 |
Grade A, and why
agentbrush 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 28 lines — stays where its author put it; the contents beside it link to each section on GitHub.
README Visual Examples
- BG removal demos: ALWAYS use WHITE background — white has zero color overlap with any colorful illustration. Black bg is risky: dark feather/fur/shadow details near edges are close to black threshold, flood fill nibbles them. Three iterations proved this. Current showcase: colorful owl on white bg.
- Comparison images built with
/tmp/rebuild_readme_examples.pypattern: Pillow checker-bg composites, side-by-side panels, labeled withfind_font()Menlo fallback. - Composite example (#4) reuses the bg-removal cutout — if #1 looks bad, #4 cascades.
Trapped Green Screen (0.4.0)
- Edge flood fill can never reach green enclosed by artwork — the sweep pass is the only thing that ever removed those pockets, and it only matches pixels still close to pure green. A pocket whose blend ring has drifted (or that a later hue/lift pass brightens) survives every pass and prints as a coloured bar. Detection is a REACHABILITY question, not a colour question.
- Never assume the key colour. Real defect: art was keyed on (107,195,21)
while the pipeline default was (24,242,41) — 83 apart on red, so key matching
silently matched nothing.
sample_key_color()reads it off the border. - Key mode gates, chroma mode only warns. Green-dominance + saturation is all
that survives once the key has been blended away, and it also matches
deliberate green artwork — measured 43% hit rate on a real 207-file catalogue.
A gate that fires on 43% of shipped work gets ignored, so heuristic findings
are warnings and the hard gate needs a key (
--source/--key). - Labelling is run-based (horizontal runs + union-find), not per-pixel: ~0.5s on a 24MP file. numpy is required — per-pixel Python is not viable at that size.
- Size thresholds on print files must be relative, not absolute. 40px is a real defect on a 1024px concept and invisible speckle on a 4500x5400 tee. Measured separation: real trapped field 91 ppm of canvas, sub-visible edge fringe 2.3 ppm — the default sits at 8 ppm with a 40px floor.
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.
- 9d ago First seen · 28 lines · 523 tokens per session scan A 9aeeaa8f4316
agentbrush CLAUDE.md is an instructions file published in the GitHub repository ultrathink-art/agentbrush (9 stars, last pushed 1mo ago), licensed MIT. It adds 523 tokens to every session, about $0.0026 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 2026-08-31.
Other instructions, from other repositories
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.