Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/feliperun/md.html/agents-mdgit clone --depth 1 https://github.com/feliperun/md.htmlWhat 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 | $0.01996 | $0.01996 |
| Opus 5 | $0.00998 | $0.00998 |
| Sonnet 5 | $0.00399 | $0.00399 |
| Haiku 4.5 | $0.00200 | $0.00200 |
Grade A, and why
md.html 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 2d 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 — 131 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md — md.html
Architecture · Abstractions · Vision · Getting Started · ADRs · Sentrux
Write the minimum code that runs. No fluff, no gold-plating.
- Do not preserve backward compatibility. Remove obsolete paths instead of adding compatibility layers, fallbacks, or migrations.
- Choose the simplest implementation that fully meets the current requirements. Avoid speculative abstractions, configuration, and indirection.
- Grow the system in layers. Start from the smallest version that works end to end, and add each new capability on top of a product that already works. Never trade a working product for unfinished complexity.
- Keep components modular and concerns clearly separated.
- Prefer established, well-maintained libraries when they reduce overall complexity or improve reliability. Do not reimplement common functionality without a clear reason.
- Lean on the dependencies already in the project before writing your own implementation or adding packages. Do not assume a library lacks a capability without checking its documentation and types.
- Make architectural decisions for the long term. Do not accept a stopgap that only works for now and is meant to be replaced later.
- Study how established products solve the problem before designing a solution. Adopt their proven patterns and conventions rather than inventing an approach from scratch.
Repository rules
AGENTS.mdis the single source of guidance.CLAUDE.md,GEMINI.md,CURSOR.md,AGENT.mdand.github/copilot-instructions.mdare symlinks to it. Never edit a symlink; never let one drift into a real file.- Never commit secrets. Tokens, credentials, and service-account JSON stay in a
secret manager or a gitignored
.env. Thepre-commithook scans the staged diff; do not work around it. - No personal or production-derived data in source, migrations, fixtures, tests, or docs. Committed fixtures are synthetic. User-specific values belong in runtime configuration.
- Never expose internals to users. No stack traces, internal URLs, or env var names in user-facing copy.
- Conventional Commits required.
feat:,fix:,docs:,refactor:,test:,chore:. One logical change per commit; one bounded scope per PR. Release tooling parses them — a break in a published contract ships asfeat!:or carries aBREAKING CHANGE:footer, never as a plainfeat:. - Never
--no-verify. If a hook blocks, fix the underlying issue. - Code, comments, and identifiers in English. Surgical changes — no opportunistic refactors in feature PRs, no suppression comments to silence a linter.
- Shell scripts run under
set -euo pipefailand are idempotent — re-running completes what is missing instead of duplicating or destroying.
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.
- 2d ago First seen · 131 lines · 1,996 tokens per session scan A bb10a425a100
md.html AGENTS.md is an instructions file published in the GitHub repository feliperun/md.html (11 stars, last pushed 7d ago), licensed MIT. It adds 1,996 tokens to every session, about $0.0100 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.
Other instructions, from other repositories
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
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).
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.
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.
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).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.