What is katana-markdown-linter AGENTS.md?

Project instructions for working on katana-markdown-linter, a Rust library that checks and fixes Markdown formatting in code editors and other tools.

Use them when editing the project’s README or documentation, especially when changing language or status tables.

They explain language and command rules that keep documentation consistent and ensure the required lint check is run before reporting changes complete.

How HiroyukiFuruno/katana-markdown-linter configures Codex and OpenCod

Reuse

Borrowing it

Nothing to install: this file belongs to HiroyukiFuruno/katana-markdown-linter. 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/HiroyukiFuruno/katana-markdown-linter/master/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/HiroyukiFuruno/katana-markdown-linter

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/hiroyukifuruno/katana-markdown-linter/agents-md/github.svg)](https://agentmods.dev/instructions/hiroyukifuruno/katana-markdown-linter/agents-md)

Your own site

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

Per session 91 This file is loaded in full into every session.

When invoked 91 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	$0.00091	$0.00091
Opus 5.5	$0.00036	$0.00036
Sonnet 5.5	$0.00018	$0.00018
Haiku 4.5	$0.00009	$0.00009

Measured 2mo ago against content hash 5a26469bfe24, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

katana-markdown-linter 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 · 9 lines

What it actually says

Project Rules

README.md and public Markdown under docs/ must be written in English.
Do not add Japanese prose or Japanese status labels to user-facing documentation.
When updating README.md or docs language/status tables, run just ast-lint before reporting completion.
Use scripts/openspec instead of calling a bare openspec command from agent instructions or local workflow docs.

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 First seen · 9 lines · 91 tokens per session scan A 5a26469bfe24

Subscribe to this mod's changes

katana-markdown-linter AGENTS.md is an instructions file published in the GitHub repository HiroyukiFuruno/katana-markdown-linter (0 stars, last pushed yesterday), licensed MIT. It adds 91 tokens to every session, about $0.0004 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 2026-08-31.

katana-markdown-linter AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
katana-markdown-linter AGENTS.mdHiroyukiFuruno/katana-markdown-linter	Instructions file	0	yesterday	MIT	A	91	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

katana-markdown-linter: Instructions file for Codex