ctf-osint SKILL.md skillA
This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.
ctf-osint from naravid19/claude-ctf-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add naravid19/claude-ctf-skills/ctf-osint@git:20261024.8f9bd65Pins git:20261024.8f9bd65 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- naravid19/claude-ctf-skills
- Path
skills/ctf-osint/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261024.8f9bd65, committed Oct 24, 2026
- First version recorded
- Sep 8, 2026
- Size
- 10,195 bytes
- Repository stars
- 4
- License
- MIT
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.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# CTF OSINT Quick reference for OSINT CTF challenges. Each technique has a one-liner here; see supporting files for full details. ## Prerequisites **Python packages (all platforms):** ```bash pip install shodan Pillow ``` **Linux (apt):** ```bash apt install whois dnsutils nmap libimage-exiftool-perl imagemagick curl ``` **macOS (Homebrew):** ```bash brew install whois bind nmap exiftool imagemagick curl ``` **MCP servers (optional):** Playwright MCP ([microsoft/playwright-mcp](https://github.com/microsoft/playwright-mcp)) for browser-driven OSINT (JS-rendered pages, reverse-image/map flows) — see [tools-mcp.md](tools-mcp.md). ## Additional Resources - [social-media.md](social-media.md) - Twitter/X (user IDs, Snowflake timestamps, syndication API, memory.lol, Wayback CDX), Tumblr (blog checks, post JSON, avatars), BlueSky search + API, Unicode homoglyph steganography, Discord API, username OSINT (namechk, whatsmyname, Osint Industries), username metadata mining (postal codes), platform false positives, multi-platform chains, Strava fitness route OSINT …
Read the whole file at its exact version.
How to install
mdr add naravid19/claude-ctf-skills/ctf-osint@sha256:92c0afad525c8dceThe line at the top of this page pins the label git:20261024.8f9bd65, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_p2irk2sj7fcooyk5)
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Versions
The registry has recorded 2 versions of this file, between Sep 8, 2026 and Oct 24, 2026, about one every 46 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261024.8f9bd65 latest | 2026-10-24 | 8f9bd65 | 10,195 B | A | view · diff |
| git:20260908.0cdca9b | 2026-09-08 | 0cdca9b | 9,255 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10195 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
naravid19/claude-ctf-skills · 4 stars · license MIT · pushed 2026-10-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_p2irk2sj7fcooyk5 GET https://markdownregistry.com/api/v1/resolve?ref=naravid19/claude-ctf-skills/ctf-osint GET https://markdownregistry.com/api/v1/blob/92c0afad525c8dce1047db2a749a7148b6aa0c5f13aac91755b4218835a95e4c
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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