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solve-challenge

solve-challenge is a skill for Claude Code from dailyyarn/CTF-agent. It costs 77 tokens per session (1,759 once invoked), scanned A, original, MIT.

A workflow skill for solving capture-the-flag challenges, which are security puzzles designed to find hidden flags. It examines files, services, links, and clues, then chooses methods for areas such as web security, cryptography, reverse engineering, and forensics.

In plain words
What is it for?
Analyzing challenge files, connecting to challenge services, investigating evidence, exploiting vulnerabilities, and finding flags.
Why use it?
It gives challenge solving a repeatable process for identifying the problem and selecting the right security technique.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions Claude Code.

not rated 5repo 5mo ago A scan 77 tokens original MIT

Good fit Analyzing challenge files, connecting to challenge services, investigating evidence, exploiting vulnerabilities, and finding flags.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/dailyyarn/ctf-agent/solve-challenge
View source ↗ dailyyarn/CTF-agent
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add dailyyarn/CTF-agent --skill solve-challenge
Clone the repo
git clone --depth 1 https://github.com/dailyyarn/CTF-agent

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for solve-challenge

README.md
[![agentmods](https://agentmods.dev/badge/skills/dailyyarn/ctf-agent/solve-challenge.svg)](https://agentmods.dev/skills/dailyyarn/ctf-agent/solve-challenge)
Your own site
<a href="https://agentmods.dev/skills/dailyyarn/ctf-agent/solve-challenge"><img src="https://agentmods.dev/badge/skills/dailyyarn/ctf-agent/solve-challenge.svg" alt="Measured on agentmods" height="20"></a>
Per session 77 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,759 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00077 $0.01759
Opus 5 $0.00039 $0.00879
Sonnet 5 $0.00015 $0.00352
Haiku 4.5 $0.00008 $0.00176

Measured 7d ago against content hash c9b212ee3070, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

solve-challenge scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- Web + Forensics: paywall bypass (curl reveals content hidden by CSS overlays)
ctf_agent/knowledge/embedded_ctf_skills/solve-challenge/SKILL.md · 139 lines

How it starts

The opening of the file, as written. The whole thing — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CTF Challenge Solver

You're a skilled CTF player. Your goal is to solve the challenge and find the flag.

Workflow

Step 1: Recon

  1. Explore files -- List the challenge directory, run file * on everything
  2. Triage binaries -- strings, xxd | head, binwalk, checksec on binaries
  3. Fetch links -- If the challenge mentions URLs, fetch them FIRST for context
  4. Connect -- Try remote services (nc) to understand what they expect
  5. Read hints -- Challenge descriptions, filenames, and comments often contain clues

Step 2: Categorize

Determine the primary category, then invoke the matching skill.

By file type:

  • .pcap, .pcapng, .evtx, .raw, .dd, .E01 -> forensics
  • .elf, .exe, .so, .dll, binary with no extension -> reverse or pwn (check if remote service provided -- if yes, likely pwn)
  • .py, .sage, .txt with numbers -> crypto
  • .apk, .wasm, .pyc -> reverse
  • Web URL or source code with HTML/JS/PHP/templates -> web
  • Images, audio, PDFs with no obvious content -> forensics (steganography)

By challenge description keywords:

  • "buffer overflow", "ROP", "shellcode", "libc", "heap" -> pwn
  • "RSA", "AES", "cipher", "encrypt", "prime", "modulus", "lattice", "LWE", "GCM" -> crypto
  • "XSS", "SQL", "injection", "cookie", "JWT", "SSRF" -> web
  • "disk image", "memory dump", "packet capture", "registry", "power trace", "side-channel", "spectrogram", "audio tracks", "MKV" -> forensics
  • "find", "locate", "identify", "who", "where" -> osint
  • "obfuscated", "packed", "C2", "malware", "beacon" -> malware
  • "jail", "sandbox", "escape", "encoding", "signal", "game", "Nim", "commitment", "Gray code" -> misc

By service behavior:

  • Port with interactive prompt, crash on long input -> pwn
  • HTTP service -> web
  • netcat with math/crypto puzzles -> crypto
  • netcat with restricted shell or eval -> misc (jail)

Step 3: Invoke the Category Skill

Once you identify the category, invoke the matching skill to get specialized techniques:

Read the full file on GitHub · 139 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 7d ago First seen · 139 lines · 77 tokens per session scan A c9b212ee3070

Subscribe to this mod's changes

solve-challenge is a skill published in the GitHub repository dailyyarn/CTF-agent (5 stars, last pushed 5mo ago), licensed MIT. It adds 77 tokens to every session and 1,759 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Security
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