X402Check

Name: X402Check
Author: rawgroundbeef

Checked

rawgroundbeef·vlatest·other

X402Check verifies if a given prompt adheres to specific formatting guidelines, ensuring consistent and reliable outputs across various applications.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

Installs under a different name. Its SKILL.md names it x402lint, not the name it is listed under, so the command below uses that name.

Run this in your project

terminal

$ npx skills add rawgroundbeef/x402lint --skill x402lint -a claude-code

Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

rawgroundbeef

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned 2 Oct 2026

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

Declares what it does: passed
SKILL.md parses and declares a name and a description.
SKILL.md exists, its frontmatter parses, and it declares a name and a description.
No undeclared network calls: passed
Makes no network calls.
Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.
No obfuscated payloads: passed
No encoded or obfuscated payloads.
No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.
No credential access: passed
Reads no keys, tokens, keychains or credential files.
Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.
No pipe-to-shell installers: passed
No pipe-to-shell or download-and-run installers.
No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.
Pinned to a commit: passed
Scanned rawgroundbeef/x402check at 07c4a12954.
The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit: 07c4a12954
Manifest: .claude/skills/x402lint/SKILL.md
Scanned: 2 files, 294 lines

This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.

What each check looks for →

About this skill

What it does

The x402check skill provides a simple mechanism to verify if an input string matches a predefined pattern. It can be used to validate user input, check data formats, or ensure compliance with specific rules. The skill returns a boolean value indicating whether the input conforms to the expected pattern.

When to use it

Validating email addresses before sending confirmation emails.
Checking if a postal code is in the correct format.
Ensuring that user-provided passwords meet minimum complexity requirements.
Confirming that an order number follows a specific structure.

Key capabilities

Pattern matching
Boolean return value
Input validation

Example prompts

"Does '[email protected]' match the email pattern?"
"Is '12345-6789' a valid postal code according to the defined format?"
"Validate this password: 'P@sswOrd1'"

Tips & gotchas

The skill’s effectiveness depends on having a correctly defined pattern. Ensure that the pattern accurately reflects the expected input format for reliable validation.