What is ditherer AGENTS.md?

A project guide for Ditherer, a browser tool that applies dithering and other effects to images and video. It explains the app’s structure, technologies, controls, and common commands.

Use it when developing or maintaining Ditherer, especially when working on React components, image or video processing, state handling, tests, linting, or builds.

It gives coding agents the project context they need before changing code, reducing guesswork about how the interface and data flow are organised.

How gyng/ditherer configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to gyng/ditherer. 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/gyng/ditherer/master/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/gyng/ditherer

Made for: Codex, OpenCode.

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/gyng/ditherer/agents-md/github.svg)](https://agentmods.dev/instructions/gyng/ditherer/agents-md)

Your own site

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

Per session 4,670 This file is loaded in full into every session.

When invoked 4,670 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.

Model	Per session	Once invoked
Fable 5.1	$0.04670	$0.04670
Opus 5.5	$0.01868	$0.01868
Sonnet 5.5	$0.00934	$0.00934
Haiku 4.5	$0.00467	$0.00467

Measured 24d ago against content hash bcd8823c153f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ditherer AGENTS.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 24d 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.

AGENTS.md · 331 lines

How it starts

The opening of the file, as written. The whole thing — 331 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Ditherer — Agent Guidelines

Project Overview

Ditherer is a browser-based image/video processing tool. Users load an image, select a dithering algorithm (or other effect), adjust parameters via a control panel, and apply the filter. The app also supports video frame processing, palette extraction, and state export/import via URL.

Stack: React 19, Vite, TypeScript, Rust/WASM (color space conversions), cmdk + Radix UI for the filter picker.

Quick reference: npm run dev (dev server) · npm run build (production build to build/) · npm run test (Vitest) · npm run lint (oxlint, plus Biome CSS checks via npm run lint:css).

Architecture

Component Hierarchy (Atomic Design)

The UI follows an implicit atomic design pattern:

Tokens — Design primitives defined in CSS custom properties:

Colors: --light-gray, --gray, --beautiful-blue, --bg-color
Layout values are inline (no token system yet)

Atoms — Leaf control components in src/components/controls/. Each renders a single HTML control:

Range.tsx — <input type="range"> with editable value display
Bool.tsx — <input type="checkbox">
Enum.tsx — <select> dropdown
Stringly.tsx — <input type="text">
Textly.tsx — <textarea>

Molecules — Composed controls:

Palette.tsx — palette selector + nested atom controls for palette options
ColorArray.tsx — color swatch grid + palette extraction UI (stateful)

Organisms — Sections of the app:

Controls (src/components/controls/index.tsx) — dispatches to the right atom/molecule based on optionTypes.type
ChainList (src/components/ChainList/index.tsx) — filter chain editor, presets, drag/drop reordering
Exporter (src/components/App/Exporter.tsx) — URL/JSON state export panel
SaveAs (src/components/SaveAs/index.tsx) — image/video file export dialog (uses MediaRecorder for video)

Page — Single page app:

App (src/components/App/index.tsx) — top-level layout: sidebar controls + draggable canvas area

Read the full file on GitHub · 331 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.

24d ago Changed · +15 tokens per session bcd8823c153f
2mo ago First seen · 331 lines · 4,655 tokens per session scan A d49beaed9bb3

Subscribe to this mod's changes

ditherer AGENTS.md is an instructions file published in the GitHub repository gyng/ditherer (98 stars, last pushed 24d ago), licensed MIT. It adds 4,670 tokens to every session, about $0.0187 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.

Creative and media browser-tool crt dithering image-filters image-processing video

ditherer AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
ditherer AGENTS.mdgyng/ditherer	Instructions file	98	24d ago	MIT	A	4,670	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	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	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

ditherer: Instructions file for Codex