ctf-web SKILL.md skillA

ctf-web 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/ctf-web@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/ctf-web/SKILL.md
Versions recorded: 1
Latest version: git:20260929.223300f, committed Sep 29, 2026
Size: 12,754 bytes
Repository stars: 11
License: AGPL-3.0

Provides web exploitation techniques for CTF challenges. Use when the target is primarily an HTTP application, API, browser client, template engine, identity flow, or smart-contract frontend/backend surface, including XSS, SQLi, SSTI, SSRF, XXE, JWT, auth bypass, file upload, request smuggling, OAuth/OIDC, SAML, prototype pollution, and similar web bugs. Do not use it for native binary memory corruption, reverse engineering of standalone executables, disk or memory forensics, or pure…

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 Web Exploitation

Use this skill as a routing and execution guide for web-heavy challenges. Keep the first pass short: map the app, confirm the trust boundary, and only then dive into the detailed technique notes.

## Prerequisites

**Python packages (all platforms):**
```bash
pip install sqlmap flask-unsign requests httpx
```

**Linux (apt):**
```bash
apt install hashcat jq curl
```

**macOS (Homebrew):**
```bash
brew install hashcat jq curl
```

**Go tools (all platforms, requires Go):**
```bash
go install github.com/ffuf/ffuf/v2@latest
```

**Manual install:**
- ysoserial — [GitHub](https://github.com/frohoff/ysoserial), requires Java (Java deserialization payloads)
- PayloadsAllTheThings — git clone to ctf-web/payloads/PayloadsAllTheThings (auto via install script or lazy clone)
  ```bash
  bash scripts/install_ctf_tools.sh pat   # PAT only
  bash scripts/install_ctf_tools.sh all   # all tools including PAT
  # manual fallback:
  git clone --depth 1 https://github.com/swisskyrepo/PayloadsAllTheThings.git ctf-web/payloads/PayloadsAllTheThings
  ```
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add cyr1s-dev/lynceus/ctf-web@sha256:20e8d2278208414c

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_zphcumi2zsvo6qsy.svg)](https://markdownregistry.com/a/art_zphcumi2zsvo6qsy)

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	12,754 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 (12754 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_zphcumi2zsvo6qsy
GET https://markdownregistry.com/api/v1/resolve?ref=cyr1s-dev/lynceus/ctf-web
GET https://markdownregistry.com/api/v1/blob/20e8d2278208414c2d5d8177c48dcee15becfd01eaba406cd095d95e51822381

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.