check

check is a command for Claude Code from edochi/mdvs. It costs 0 tokens per session (1,488 once invoked), scanned A, original, MIT.

A command that checks Markdown files against the fields and rules declared in mdvs.toml. Frontmatter is the metadata block at the top of a Markdown file, such as its title or status.

In plain words
What is it for?
Use it to validate a directory locally or in continuous integration, with an optional external JSON Schema or without updating the schema first.
Why use it?
It finds missing, invalid, wrongly typed, or disallowed metadata before the files are used or committed.

Command for Claude Code

Written for Claude Code: a Claude Code command (commands/*.md).

Good fit Use it to validate a directory locally or in continuous integration, with an optional external JSON Schema or without updating the schema first.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/edochi/mdvs/check
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.

Clone the repo
git clone --depth 1 https://github.com/edochi/mdvs

Made for: Claude Code.

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.

agentmods badge for check

README.md
[![agentmods](https://agentmods.dev/badge/commands/edochi/mdvs/check/github.svg)](https://agentmods.dev/commands/edochi/mdvs/check)
Your own site
<a href="https://agentmods.dev/commands/edochi/mdvs/check"><img src="https://agentmods.dev/badge/commands/edochi/mdvs/check/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.

agentmods 80×15 button for check

Your own site · 80×15
<a href="https://agentmods.dev/commands/edochi/mdvs/check"><img src="https://agentmods.dev/badge/commands/edochi/mdvs/check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,488 The whole file, excluding the scripts and references it only reads on demand.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00000 $0.01488
Opus 5.5 $0.00000 $0.00595
Sonnet 5.5 $0.00000 $0.00298
Haiku 4.5 $0.00000 $0.00149

Measured 10d ago against content hash 33de06446023, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

check 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 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.

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.

book/src/commands/check.md · 166 lines

How it starts

The opening of the file, as written. The whole thing — 166 lines — stays where its author put it; the contents beside it link to each section on GitHub.

check

Validate frontmatter against the schema.

Usage

mdvs check [path]

Flags

Flag Default Description
path . Directory containing mdvs.toml
--no-update Skip auto-update before validating
--jsonschema PATH Override the [fields] block of mdvs.toml with an external JSON Schema file (.json or .toml) for this run only

Global flags (-o, -v, --logs) are described in Configuration.

What it does

check reads mdvs.toml, scans every markdown file, and validates each field value against the declared constraints.

By default, check auto-updates the schema before validating (see [check].auto_update). Use --no-update to skip the update pass and validate against the committed mdvs.toml as-is — what you want in CI.

It reports seven kinds of violations:

  • WrongType — value doesn't match the declared type (or fails a pattern regex)
  • Disallowed — field appears in a file whose path doesn't match any allowed glob
  • MissingRequired — file matches a required glob but the field is absent
  • NullNotAllowed — field is null but nullable = false
  • InvalidCategory — value is not in the field's declared categories (see Constraints)
  • OutOfRange — numeric value violates min/max, or length violates min_length/max_length
  • FrontmatterUnrepresentable — file's YAML can't be represented as JSON (NaN/inf, non-string keys, non-object top-level)

Read the full file on GitHub · 166 lines

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.

  1. 10d ago First seen · 166 lines · 0 tokens per session scan A 33de06446023

Subscribe to this mod's changes

check is a command published in the GitHub repository edochi/mdvs (27 stars, last pushed 11d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,488 tokens. 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 2026-10-05.