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ctf-osint

Solves authorized CTF OSINT challenges using public information and challenge-provided scope.

1|Updated Aug 3, 2026
Search Tags:#investigation#reconnaissance#ctf#osint#challenge solving#open source intelligence
One-click install
npx skills add https://github.com/hanmujun/hanmujun-agent-public --skill ctf-osint-hanmujun
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: ctf-osint
Source: https://github.com/hanmujun/hanmujun-agent-public/tree/main/.agents/skills/ctf-osint
Command: npx skills add https://github.com/hanmujun/hanmujun-agent-public --skill ctf-osint-hanmujun

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Solving OSINT challenges in authorized CTF competitions requires structured investigation of public information while staying strictly within the challenge-defined scope, and this Skill provides the entry point and methodology for that workflow. ## Core Features & Use Cases - Scoped Investigation: Conducts open-source intelligence gathering limited to public information and the scope explicitly authorized by the challenge. - Source Documentation: Records sources and reasoning chains for every finding so conclusions are traceable and verifiable. - Use Case: Given a CTF challenge that provides a username or image, use this Skill to systematically research public profiles, metadata, and web traces, document the derivation path, and hand off a candidate flag for verification rather than submitting blindly. ## Quick Start Load the ctf-osint skill and investigate the current challenge using only public information within the authorized scope, recording all sources and reasoning.

Frequently Asked Questions about ctf-osint

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I solve OSINT challenges in CTF competitions?▼

Start by defining the challenge-authorized scope, then investigate only public information sources such as social profiles, image metadata, and web archives. Record every source and the reasoning chain leading to each candidate answer before flag verification.

What information sources are allowed for CTF OSINT investigations?▼

Only public information and data explicitly within the challenge-provided scope are permitted. The skill enforces this boundary and requires documenting sources so the investigation stays auditable and within competition rules.

Does this skill submit flags automatically?▼

No, the skill explicitly does not submit flags directly. It produces documented findings and candidate answers that must go through the competition's verification and submission workflow separately.

Why is scope limitation important in CTF OSINT work?▼

Exceeding the authorized scope can violate competition rules and legal boundaries around real targets. Restricting investigation to public, in-scope information keeps the activity authorized and the evidence chain clean.

Where is the full OSINT methodology documented?▼

The complete technical manual lives in the skill-library at skill-library/ctf-osint/SKILL.md, which this entry point references for detailed techniques and reference material.

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