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Agent Skill

Ctf Osint skill

ctf-osintljagiello/ctf-skillsctf-osint/SKILL.md

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.

3.5kMIT

always on

65 tokname + description

once used

2,414 tokSKILL.md body

bundled files

455 KB

repo stars

3.5kGitHub

Install the Ctf Osint skill

Skills CLI (Claude Code, Codex, Cursor and others)

npx skills add https://github.com/ljagiello/ctf-skills --skill ctf-osint

Claude Code, by hand (all projects)

git clone --depth 1 https://github.com/ljagiello/ctf-skills.git /tmp/ctf-skills
mkdir -p ~/.claude/skills
cp -R /tmp/ctf-skills/ctf-osint ~/.claude/skills/ctf-osint

For one project only, copy the folder into .claude/skills/ in that project instead. The agent picks it up when a task matches its description.

What it costs your context

Agent Skills load in three steps. Tokens counted with the o200k tokenizer; your model's count will differ a little.

WhenWhat loadsCost
Every sessionName and description65 tok
When the agent uses itThe SKILL.md instructions2,414 tok
Only if opened4 bundled files (55 KB)varies

Until it is used, ctf-osint costs about 21× less than the median MCP server we measured (1,363 tokens on every turn). Installing all 12 skills from ljagiello/ctf-skills would load 1,099 tokens of descriptions. Skills vs MCP study

Checks

Our checks found nothing to flag: it follows the Agent Skills specification's naming and size guidelines and doesn't pipe downloads into a shell.

Pre-approved tools (allowed-tools): Bash, Read, Write, Edit, Glob, Grep, Task, WebFetch, WebSearch. The agent can use these without asking while the skill is active.

Checked 2026-10-22 · method

What's inside

The headings of its SKILL.md. Read the full file on GitHub.

  • CTF OSINT
  • Prerequisites
  • Additional Resources
  • When to Pivot
  • Quick Start Commands
  • String Identification
  • Twitter/X Account Tracking
  • Tumblr Investigation
  • Username OSINT
  • Image Analysis & Reverse Image Search
  • Geolocation
  • MGRS Coordinates
  • Google Plus Codes
  • Metadata Extraction
  • Google Dorking
  • Google Docs/Sheets
  • DNS Reconnaissance
  • Tor Relay Lookups
  • GitHub Repository Analysis
  • Telegram Bot Investigation
  • FEC Political Donation Research
  • IP Geolocation
  • Unicode Homoglyph Steganography
  • BlueSky Public API

More skills from ljagiello/ctf-skills

All skills in this repo
  1. ctf-ai-mlljagiello/ctf-skills

    Provides AI and machine learning techniques for CTF challenges. Use when attacking ML models, crafting adversarial examples, performing model extraction, prompt injection, membership inference, training data poisoning, fine-tuning manipulation, neural network analysis, LoRA adapter exploitation, LLM jailbreaking, or solving AI-related puzzles.

    3.5k67 tok idle · 1,584 in use
  2. ctf-cryptoljagiello/ctf-skills

    Provides cryptography attack techniques for CTF challenges. Use when attacking encryption, hashing, signatures, ZKP, PRNG, or mathematical crypto problems involving RSA, AES, ECC, lattices, LWE, CVP, number theory, Coppersmith, Pollard, Wiener, padding oracle, GCM, key derivation, or stream/block cipher weaknesses.

    3.5k78 tok idle · 11,292 in use
  3. ctf-forensicsljagiello/ctf-skills

    Provides digital forensics and signal analysis techniques for CTF challenges. Use when analyzing disk images, memory dumps, event logs, network captures, cryptocurrency transactions, steganography, PDF analysis, Windows registry, Volatility, PCAP, Docker images, coredumps, side-channel power traces, DTMF audio spectrograms, packet timing analysis, CD audio disc images, or recovering deleted files and credentials.

    3.5k88 tok idle · 9,386 in use
  4. ctf-malwareljagiello/ctf-skills

    Provides malware analysis and network traffic techniques for CTF challenges. Use when analyzing obfuscated scripts, malicious packages, custom crypto protocols, C2 traffic, PE/.NET binaries, RC4/AES encrypted communications, YARA rules, shellcode analysis, memory forensics for malware (Volatility malfind, process injection detection), anti-analysis techniques (VM/sandbox detection, timing evasion, API hashing, process injection, environment checks), or extracting malware configurations and indicators of compromise.

    3.5k101 tok idle · 2,213 in use
  5. ctf-miscljagiello/ctf-skills

    Provides miscellaneous CTF challenge techniques for problems that do not cleanly fit the main categories. Use for encoding puzzles, pyjails, bash jails, RF/SDR, DNS oddities, unicode tricks, esoteric languages, QR or audio puzzles, constraint solving, game theory, unusual sandbox escapes, and hybrid logic puzzles. Prefer a more specific skill first when the challenge is mainly web, pwn, reverse, forensics, malware, OSINT, or crypto. Treat this as the fallback skill for genuine cross-category or edge-case challenges, not the default starting point.

    3.5k122 tok idle · 7,542 in use
  6. ctf-pwnljagiello/ctf-skills

    Provides binary exploitation techniques for CTF challenges. Use when you already have a vulnerable native target or service and need to turn memory corruption or low-level primitives into code execution or privilege escalation, such as buffer overflows, format strings, heap bugs, ROP, ret2libc, shellcode, kernel exploitation, seccomp bypass, sandbox escape, or Windows/Linux exploit chains. Do not use it when the main blocker is understanding what the binary does; use reverse engineering first. Do not use it for pure web bugs, disk or packet forensics, or standalone crypto/math challenges.

    3.5k5122 tok idle · 5,113 in use
  7. ctf-reverseljagiello/ctf-skills

    Provides reverse engineering techniques for CTF challenges. Use when the main job is to understand how a compiled, obfuscated, packed, or virtualized target works before exploiting or solving it, including binaries, APKs, WASM, firmware, custom VMs, bytecode, game clients, malware-like loaders, and anti-debug or anti-analysis logic. Do not use it when the vulnerability is already understood and the remaining task is exploitation; use pwn instead. Do not use it for pure web workflows, log or disk forensics, or standalone crypto problems unless reversing the implementation is the real blocker.

    3.5k125 tok idle · 3,813 in use
  8. ctf-similar-searchljagiello/ctf-skills

    Searches for similar CTF challenge writeups using Tavily API for search and content extraction. Use when the user requests finding related challenges, when solve-challenge has failed multiple times and needs reference solutions, or when first identifying a challenge type and seeking examples.

    3.5k258 tok idle · 1,429 in use