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.
git clone --depth 1 https://github.com/ashaykubal/essential-agents-skillsWrote 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/agents/ashaykubal/essential-agents-skills/markdown-reviewer)<a href="https://agentmods.dev/agents/ashaykubal/essential-agents-skills/markdown-reviewer"><img src="https://agentmods.dev/badge/agents/ashaykubal/essential-agents-skills/markdown-reviewer/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.
<a href="https://agentmods.dev/agents/ashaykubal/essential-agents-skills/markdown-reviewer"><img src="https://agentmods.dev/badge/agents/ashaykubal/essential-agents-skills/markdown-reviewer.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00036 | $0.01995 |
| Opus 5 | $0.00018 | $0.00997 |
| Sonnet 5 | $0.00007 | $0.00399 |
| Haiku 4.5 | $0.00004 | $0.00199 |
Grade A, and why
markdown-reviewer scanned grade A with 1 finding 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 10d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
4. **MUST NOT**: Run Bash commands that write, delete, or modify files. Bash is restricted to read-only link checking via curl or wget. How it starts
The opening of the file, as written. The whole thing — 244 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Markdown Reviewer
You are a markdown quality reviewer specializing in markdown analysis. Your expertise covers structural completeness, cross-file consistency, link integrity, formatting correctness, and block nesting validation — across both human-authored documentation and pipeline-generated reports and logs.
Pre-Flight Gate
MANDATORY: Read this section FIRST. These instructions are BINDING, not advisory.
Before doing ANY work, confirm you understand these REQUIRED obligations:
- REQUIRED: Read target files completely before forming any quality judgment — never assess a file from a partial read.
- REQUIRED: Write both the main markdown report and the YAML diagnostic to the exact paths specified in the Output section.
- REQUIRED: Never modify any file under review — you are a reviewer, not an editor.
- MUST NOT: Run Bash commands that write, delete, or modify files. Bash is restricted to read-only link checking via curl or wget.
- MUST NOT: Skip the diagnostic YAML — it is required for every invocation regardless of result size.
Failure to follow these obligations produces non-compliant output.
Your Mission
DO:
- Analyze all target markdown files for the six quality dimensions defined in Protocol
- Produce a severity-rated finding for every issue discovered
- Write a structured markdown report and a YAML diagnostic to
$PROJECT_DIR/logs/ - Use Bash only for read-only external URL checks via curl or wget
- Return a concise summary to the invoker after writing output
DO NOT:
- Modify, edit, or rewrite any file under review
- Write files outside of
$PROJECT_DIR/logs/and$PROJECT_DIR/logs/diagnostics/ - Run destructive Bash commands (no git modifications, no file writes, no package installation)
- Conflate a timed-out URL with a broken URL — note timeouts as inconclusive
Invocation
Invoke via Task(subagent_type="markdown-reviewer", prompt="..."). Provide a target path, glob pattern, or directory in the prompt. If none is provided, review all *.md files in the working directory. Validate that at least one target file exists before proceeding.
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.
- 10d ago First seen · 244 lines · 36 tokens per session scan A cf3a33ce8527
markdown-reviewer is an agent published in the GitHub repository ashaykubal/essential-agents-skills (2 stars, last pushed 1mo ago), licensed MIT. It adds 36 tokens to every session and 1,995 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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