runxhq/runx · fixtures/skills/x402-pay-paid-echo-fulfill/SKILL.md

pay-fulfill-rail skillB

pay-fulfill-rail is agent-read markdown (skill) from runxhq/runx: Deterministically fulfill the x402 paid echo fixture rail spend..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add runxhq/runx/pay-fulfill-rail@git:20260723.6e5370b
Exact content
mdr add runxhq/runx/pay-fulfill-rail@sha256:703a7df7f88dd4de

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_6sncqqcb2o2bfmnu.svg)](https://markdownregistry.com/a/art_6sncqqcb2o2bfmnu)

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Versions

versioncommittedcommitsizeaudit
git:20260723.6e5370b latest2026-07-23 6e5370b 180 BB view · diff
git:20260623.23b041b2026-06-23 23b041b 445 BA view · diff
git:20260521.b7b75872026-05-21 b7b7587 340 BA view

Audit of the latest version

B  16 of 17 checks passed. Deterministic, no model, same answer every run.
  • fail: Size between 200 bytes and 200 KB (180 bytes)
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

runxhq/runx · 90 stars · license Apache-2.0 · pushed 2026-09-14 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_6sncqqcb2o2bfmnu
GET https://markdownregistry.com/api/v1/resolve?ref=runxhq/runx/pay-fulfill-rail
GET https://markdownregistry.com/api/v1/blob/703a7df7f88dd4de15b17d52e53e05bb50408b73ed55d396f63b9056fa48996b

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.