solve-challenge SKILL.md skillA

solve-challenge from cyr1s-dev/lynceus is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add cyr1s-dev/lynceus/solve-challenge@git:20260929.223300f

Pins git:20260929.223300f in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: cyr1s-dev/lynceus
Path: resources/skills/solve-challenge/SKILL.md
Versions recorded: 1
Latest version: git:20260929.223300f, committed Sep 29, 2026
Size: 9,183 bytes
Repository stars: 11
License: AGPL-3.0

Solves CTF challenges by performing first-pass triage, identifying the dominant category, and routing execution to the right specialized ctf-* skill. Use when the user gives you a challenge bundle, a remote service, a suspicious file, or only a vague challenge description and you must determine where to start. Do not use it when the category is already clear and a specialized skill can be invoked directly; this is the dispatcher and recon entrypoint, not the deepest reference for…

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 Challenge Solver

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

## Environment Setup

Two setup strategies depending on your workflow:

### Pre-install (recommended before competitions)

Use the central installer entrypoint:

```bash
bash scripts/install_ctf_tools.sh all
```

Run a narrower mode when you only want one tool group:

```bash
bash scripts/install_ctf_tools.sh python
bash scripts/install_ctf_tools.sh apt
bash scripts/install_ctf_tools.sh brew
bash scripts/install_ctf_tools.sh gems
bash scripts/install_ctf_tools.sh go
bash scripts/install_ctf_tools.sh manual
```

The full package lists now live in [scripts/install_ctf_tools.sh](../scripts/install_ctf_tools.sh).

### On-demand (during challenges)

Each category skill's `SKILL.md` has a **Prerequisites** section listing only the tools needed for that category. Install as you go.

## Workflow

### Step 0: CTFd Platform Detection

If the CTF platform URL is known, check if it runs CTFd and switch to API-driven navigation:

```bash
# Detect CTFd (look for /api/v1/ and /themes/core/)
curl -s "$CTF_URL/api/v1/" | head -5
curl -s "$CTF_URL" | grep -oE '/themes/core/'
```
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add cyr1s-dev/lynceus/solve-challenge@sha256:86e37d7ff93ecffa

The line at the top of this page pins the label git:20260929.223300f, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_za7qsgudgmv5foe4.svg)](https://markdownregistry.com/a/art_za7qsgudgmv5foe4)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 1 version of this file, committed on Sep 29, 2026.

version	committed	commit	size	audit
git:20260929.223300f latest	2026-09-29	223300f	9,183 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the 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 (9183 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

cyr1s-dev/lynceus · 11 stars · license AGPL-3.0 · pushed 2026-09-29 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_za7qsgudgmv5foe4
GET https://markdownregistry.com/api/v1/resolve?ref=cyr1s-dev/lynceus/solve-challenge
GET https://markdownregistry.com/api/v1/blob/86e37d7ff93ecffa0193936b2902fd76bf1f3b22e914ecd4c2ed9798ecb27afe

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.