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/dahlia/hongdown/agents-mdgit clone --depth 1 https://github.com/dahlia/hongdownWrote 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/dahlia/hongdown/agents-md)<a href="https://agentmods.dev/instructions/dahlia/hongdown/agents-md"><img src="https://agentmods.dev/badge/instructions/dahlia/hongdown/agents-md.svg" alt="Measured on agentmods" 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 | $0.04357 | $0.04357 |
| Opus 5 | $0.02178 | $0.02178 |
| Sonnet 5 | $0.00871 | $0.00871 |
| Haiku 4.5 | $0.00436 | $0.00436 |
Grade A, and why
hongdown 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 5d 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.
The source is not reproduced here
Licensed GPL-3.0
The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 5d ago First seen · 522 lines · 4,357 tokens per session scan A 4de771a283de
hongdown AGENTS.md is an instructions file published in the GitHub repository dahlia/hongdown (197 stars, last pushed 1mo ago), licensed GPL-3.0. It adds 4,357 tokens to every session, about $0.0218 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
HyMarkX AGENTS.md
Instructions for NAME0x0/HyMarkX, covering agent instructions, before changing anything, verification is not optional, where decisions live and scope discipline.
HyMarkX CLAUDE.md
Instructions for NAME0x0/HyMarkX, covering hymarkx — working agreement, roles, hard invariants, current state and naming.
goldmark AGENTS.md
AGENTS.md instructions for yuin/goldmark, covering instructions for agents, testing instructions, benchmark instructions, coding conventions and key point of commonmark spec.
telegramify-markdown AGENTS.md
Instructions for sudoskys/telegramify-markdown, covering telegramify-markdown agent guide, task routing, quick commands, project rules and architecture map.
markview CLAUDE.md
Instructions for paulhkang94/markview, covering markview — ai development guide, quick reference, architecture, mcp tools (for ai integration) and safety rules.
goldmark CLAUDE.md
Claude Code instructions for yuin/goldmark, a project described as: :trophy: A markdown parser written in Go. Easy to extend, standard(CommonMark) compliant, well structured.