What is react-x11 AGENTS.md?

Repository guidance for coding agents and contributors working on react-x11, a React renderer that draws interfaces in X11 desktop windows using JavaScript.

Use it when modifying the renderer, its X11 window handling, layout, events, or development files.

It explains the project’s structure and rendering rules so changes fit its architecture and avoid incorrect assumptions about how windows and layout work.

How sidorares/react-x11 configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to sidorares/react-x11. 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/sidorares/react-x11/master/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/sidorares/react-x11

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/sidorares/react-x11/agents-md/github.svg)](https://agentmods.dev/instructions/sidorares/react-x11/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/sidorares/react-x11/agents-md"><img src="https://agentmods.dev/badge/instructions/sidorares/react-x11/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/sidorares/react-x11/agents-md"><img src="https://agentmods.dev/badge/instructions/sidorares/react-x11/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 32,484 This file is loaded in full into every session.

When invoked 32,484 The same file — it is already loaded in full.

Security scan A 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	$0.32484	$0.32484
Opus 5.5	$0.12994	$0.12994
Sonnet 5.5	$0.06497	$0.06497
Haiku 4.5	$0.03248	$0.03248

Measured 11d ago against content hash 59ede0858b4e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

react-x11 AGENTS.md scanned grade A 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 11d 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.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

would drag in `ws` and `node:child_process`.

AGENTS.md · 2,024 lines

How it starts

The opening of the file, as written. The whole thing — 2,024 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Guidance for AI agents (and new contributors) working on react-x11.

What this project is

A custom React renderer for desktop applications, with react-like ergonomics over four backends:

X11 — ntk / node-x11, pure JavaScript implementations of the X11 protocol, no native bridge. The flagship target, and the only one with <foreign> embedding, substructure redirect (examples/wm.jsx) and react-x11/test.
Cocoa — src/cocoa/, over the @windowkit/appkit bridge (an optionalDependency, prebuilt). Real NSWindows, Core Animation compositing, the system menu bar, native control bezels. The default on darwin, so npm test, the benches and the examples all behave differently there than they did before it existed — check which backend you are measuring. design/macos.md is the design record; docs/macos.md is what an app sees.
Wayland — src/wayland/, the wire protocol in pure JavaScript with a GLES rasterizer of its own (design/wayland.md's Tier D). Opt-in only, never through 'auto': X11 stays the default on Linux because the remote case is the flagship reason this project exists and Wayland has no network transparency.
win32 — src/win32/, over the @windowkit/win32 bridge (an optionalDependency, prebuilt). HWNDs on a UI thread of the bridge's own, a DirectComposition surface per window, Direct2D drawing and DirectWrite text. The default on win32, falling back to X11 when the bridge is absent so a WSLg or Cygwin setup with DISPLAY keeps working. design/windows.md is the design record. Young: the examples run, with an IMM32 input method, a UI Automation bridge and most desktop services (tray, notifications, file dialogs, taskbar) in place — docs/windows-integrations.md is the measured status.

The 2d drawing dialect lives in src/backend/context2d.js and is shared by the two native bridges: the class takes its native as a constructor argument and calls nothing else, so one wrapper drives CoreGraphics verbs and Direct2D verbs alike. Wayland is deliberately not in that family — its context is a rasterizer that draws the dialect rather than forwarding it, which is a different layer and not a duplicate.

Read the full file on GitHub · 2,024 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.

11d ago Changed · +5 lines · +85 tokens per session 59ede0858b4e
15d ago Changed · +28 lines · +496 tokens per session 139ad3b7448b
17d ago Changed · +62 lines · +1,136 tokens per session a4192147e364
18d ago Changed · +18 lines · +325 tokens per session 27ae9c6260ff
25d ago Changed · +3 tokens per session e99733b0b895
26d ago Changed · +8 lines · +160 tokens per session 041836ad3fb7
29d ago Changed · +6 lines · +111 tokens per session c483055d02f8
1mo ago Changed · +3 lines · +62 tokens per session 52bf29dcbbc0
1mo ago Changed · +5 tokens per session 2561a74d53b5
1mo ago First seen · 1,894 lines · 30,101 tokens per session scan A ef262f03c70b

Subscribe to this mod's changes

react-x11 AGENTS.md is an instructions file published in the GitHub repository sidorares/react-x11 (265 stars, last pushed yesterday), licensed MIT. It adds 32,484 tokens to every session, about $0.1299 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

react-x11 AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
react-x11 AGENTS.mdsidorares/react-x11	Instructions file	265	yesterday	MIT	A	32,484	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	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

react-x11: Instructions file for Codex