A command for checking or fixing Markdown linting issues in selected files, folders, or the whole project. Markdown linting checks whether Markdown follows consistent formatting rules.

Run it in check mode to report issues or fix mode to change files. The scope can be a file, several files, a folder, or a glob pattern.

It helps find documentation formatting problems and can correct them automatically when requested.

mdlinter — Command for Claude Code by s2005: A command for checking or fixing Markdown linting issues…

Install

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.

agentmods

npx agentmods add commands/s2005/markdown-linter-fixer-skill/mdlinter

Clone the repo

git clone --depth 1 https://github.com/s2005/markdown-linter-fixer-skill

Made for: Claude Code.

Or install markdown-linter-fixer, the plugin that ships this one along with the rest of its 1 skill, 1 command.

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/commands/s2005/markdown-linter-fixer-skill/mdlinter.svg)](https://agentmods.dev/commands/s2005/markdown-linter-fixer-skill/mdlinter)

Your own site

<a href="https://agentmods.dev/commands/s2005/markdown-linter-fixer-skill/mdlinter"><img src="https://agentmods.dev/badge/commands/s2005/markdown-linter-fixer-skill/mdlinter.svg" alt="Measured on agentmods" height="20"></a>

Per session 10 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 601 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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	$0.00010	$0.00601
Opus 5	$0.00005	$0.00300
Sonnet 5	$0.00002	$0.00120
Haiku 4.5	$0.00001	$0.00060

Measured 6d ago against content hash 450896a8ffd2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

mdlinter 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 6d 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.

commands/mdlinter.md · 66 lines

What it actually says

Markdown Linter - {{ARGUMENTS}}

Use the markdown-linter-fixer skill to check or fix markdown linting issues.

Command format: /markdown-linter-fixer:mdlinter [mode] [scope]

Arguments:

Mode (optional): {{ARGUMENTS}}
- First argument can be either check or fix
- check - scan and report issues WITHOUT making changes (DEFAULT if not specified or invalid)
- fix - scan and automatically fix all issues
- Safety default: If no mode is provided or an invalid mode is given, defaults to check mode
Scope (optional):
- Can be specified as second argument (or first if mode is omitted)
- Can be: a specific file, multiple files (space-separated), a folder, or a glob pattern
- If not provided, operates on ALL markdown files in the project

Examples:

/markdown-linter-fixer:mdlinter - check all files (default mode)
/markdown-linter-fixer:mdlinter check - explicitly check all files
/markdown-linter-fixer:mdlinter fix - fix all files
/markdown-linter-fixer:mdlinter README.md - check only README.md (default mode)
/markdown-linter-fixer:mdlinter check README.md - explicitly check only README.md
/markdown-linter-fixer:mdlinter fix docs/ - fix all files in docs folder
/markdown-linter-fixer:mdlinter check README.md CONTRIBUTING.md - check specific files

Workflow based on mode:

IMPORTANT: If mode is not specified or is invalid, always use CHECK mode as the safe default.

For CHECK mode:

Verify markdownlint-cli2 installation
Check for existing configuration files
Run diagnostic scans on the specified scope
Categorize and analyze all errors by type
Generate comprehensive report
IMPORTANT: Do NOT execute auto-fix (--fix flag)
Do NOT make any manual fixes to files
ONLY scan and report the issues found

For FIX mode:

Verify markdownlint-cli2 installation
Check/create configuration files
Run diagnostic scans on the specified scope
Apply automatic fixes using --fix flag
Handle any remaining manual fixes (especially MD029 issues)
Verify all issues are resolved
Provide comprehensive summary report

Report should include:

Total files scanned
All errors found by type (MD001, MD029, MD032, etc.)
File names and line numbers for each error
Count of each error type
Which errors are auto-fixable vs require manual intervention

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.

6d ago First seen · 66 lines · 10 tokens per session scan A 450896a8ffd2

Subscribe to this mod's changes

mdlinter is a command published in the GitHub repository s2005/markdown-linter-fixer-skill (10 stars, last pushed 5mo ago), licensed MIT. It adds 10 tokens to every session and 601 once invoked, about $0.0001 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 2026-08-31.

Writing and docs documentation formatting linter markdown markdownlint md

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