What is horseMD AGENTS.md?

Repository guidelines for HorseMD, an Electron and React Markdown editor with desktop and mobile builds. They describe where the main process, secure bridge, interface, documentation, scripts, and platform files live.

Use them when modifying file operations, menus, editor behavior, mobile support, documentation, verification scripts, or packaging assets.

They show where a change belongs and help prevent desktop, mobile, and shared-interface code from becoming mixed together.

How BND-1/horseMD configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to BND-1/horseMD. 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/BND-1/horseMD/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/BND-1/horseMD

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/bnd-1/horsemd/agents-md/github.svg)](https://agentmods.dev/instructions/bnd-1/horsemd/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/bnd-1/horsemd/agents-md"><img src="https://agentmods.dev/badge/instructions/bnd-1/horsemd/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/bnd-1/horsemd/agents-md"><img src="https://agentmods.dev/badge/instructions/bnd-1/horsemd/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 4,502 This file is loaded in full into every session.

When invoked 4,502 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	$0.04502	$0.04502
Opus 5.5	$0.01801	$0.01801
Sonnet 5.5	$0.00900	$0.00900
Haiku 4.5	$0.00450	$0.00450

Measured 2mo ago against content hash f10bee43c6b5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

horseMD 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 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.

AGENTS.md · 183 lines

How it starts

The opening of the file, as written. The whole thing — 183 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Repository Guidelines

Project Structure & Module Organization

HorseMD is an Electron + Vite + React Markdown editor with a shared renderer for desktop and Capacitor mobile builds.

src/main/index.js: Electron main-process lifecycle, window, IPC assembly, menus, assets, and update checks.
src/main/filesystem.js, watchers.js, documents.js: file operations, watchers, dialogs, and PDF export.
src/preload/index.js: secure window.api bridge exposed to the renderer.
src/renderer/src/: React app, Milkdown editor, hooks, shell components, themes, i18n, platform shim.
src/renderer/src/components/Editor.jsx: Crepe/ProseMirror editor wrapper; keep new editor features in focused editor-*.js helpers when possible.
src/renderer/src/hooks/ and src/renderer/src/lib/: file ops, lifecycle, outline, find/replace, menus, and review actions.
docs/: architecture, features, development workflow, mobile notes, and manual testing.
scripts/: lightweight verification and CDP helpers.
website/: static product/download homepage; guide/: isolated VitePress user tutorial site.
build/, icons/, android/, ios/: packaging assets and mobile shells.

Build, Test, and Development Commands

npm install
npm run dev
npm run build
npm start
npm run dist
npm run build:mobile
npm run test:source-map
npm run guide:check
node scripts/test-strike-guard.mjs

npm run dev: starts Electron/Vite hot reload.
npm run build: builds main, preload, and renderer into out/; CI uses this.
npm start: runs the built app.
npm run dist: creates the host-platform installer via electron-builder.
npm run build:mobile: builds the Capacitor renderer into dist-mobile/.
npm run test:source-map: runs Markdown raw-offset ↔ ProseMirror mapping tests for tables, duplicate text, code, images, lists, and HTML.
npm run guide:check: validates tutorial metadata, versions, links, assets, screenshot privacy/dimensions, and builds the guide site.
node scripts/test-strike-guard.mjs: runs CriticMarkup strike regression checks.

Read the full file on GitHub · 183 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.

2mo ago Changed · +15 lines · +390 tokens per session f10bee43c6b5
2mo ago First seen · 168 lines · 4,112 tokens per session scan A 0b5626196942

Subscribe to this mod's changes

horseMD AGENTS.md is an instructions file published in the GitHub repository BND-1/horseMD (588 stars, last pushed 6d ago), licensed MIT. It adds 4,502 tokens to every session, about $0.0180 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.

horseMD AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
horseMD AGENTS.mdBND-1/horseMD	Instructions file	588	6d ago	MIT	A	4,502	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	yesterday	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

horseMD: Instructions file for Codex