ljagiello/ctf-skills · ctf-osint/SKILL.md

ctf-osint skillA

ctf-osint is agent-read markdown (skill) from ljagiello/ctf-skills: Provides open source intelligence techniques for CTF challenges. Use when gathering information from public sources, social media, geolocation, DNS records, username enumeration, reverse image search, Google dorking, Wayback Machine, Tor relays, FEC filings, or identifying unknown data like hashes and coordinates..

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 ljagiello/ctf-skills/ctf-osint@git:20260417.b80ec3f
Exact content
mdr add ljagiello/ctf-skills/ctf-osint@sha256:a78f55e0162d3b09

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_gesx65hfh2qwlgeo.svg)](https://markdownregistry.com/a/art_gesx65hfh2qwlgeo)

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Versions

versioncommittedcommitsizeaudit
git:20260417.b80ec3f latest2026-04-17 b80ec3f 9,255 BA view · diff
git:20260328.ac4dfd92026-03-28 ac4dfd9 9,254 BA view · diff
git:20260327.40100a92026-03-27 40100a9 8,819 BA view · diff
git:20260327.62aa5ea2026-03-27 62aa5ea 8,485 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (9255 bytes)
  • 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

ljagiello/ctf-skills · 3,307 stars · license MIT · pushed 2026-09-13 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_gesx65hfh2qwlgeo
GET https://markdownregistry.com/api/v1/resolve?ref=ljagiello/ctf-skills/ctf-osint
GET https://markdownregistry.com/api/v1/blob/a78f55e0162d3b09bc57456676ce0595d89a350b91e7496c1aedfaec458e21f9

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