security-and-hardening SKILL.md skillA

security-and-hardening from skillmds/skillmd is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add skillmds/skillmd/security-and-hardening@git:20260919.fecc0d5

Pins git:20260919.fecc0d5 in mdr.lock. Pin the fingerprint instead.

Audit grade

A, 17 of 17 checks passed

Kind

SKILL.md skill

Repository

skillmds/skillmd

Path

plugins/code-security-review-pipeline/skills/security-and-hardening/SKILL.md

Versions recorded

1

Latest version

git:20260919.fecc0d5, committed Sep 19, 2026

Size

18,879 bytes

Repository stars

250

License

MIT

Hardens code against vulnerabilities. Use when handling user input, authentication, data storage, or external integrations. Use when building any feature that accepts untrusted data, manages user sessions, or interacts with third-party services.

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

# Security and Hardening

## Overview

Security-first development practices for web applications. Treat every external input as hostile, every secret as sacred, and every authorization check as mandatory. Security isn't a phase — it's a constraint on every line of code that touches user data, authentication, or external systems.

## When to Use

- Building anything that accepts user input
- Implementing authentication or authorization
- Storing or transmitting sensitive data
- Integrating with external APIs or services
- Adding file uploads, webhooks, or callbacks
- Handling payment or PII data

## Process: Threat Model First

Controls bolted on without a threat model are guesses. Before hardening, spend five minutes thinking like an attacker:

1. **Map the trust boundaries.** Where does untrusted data cross into your system? HTTP requests, form fields, file uploads, webhooks, third-party APIs, message queues, and **LLM output**. Every boundary is attack surface.
2. **Name the assets.** What's worth stealing or breaking? Credentials, PII, payment data, admin actions, money movement.
3. **Run STRIDE over each boundary** — a quick lens, not a ceremony:
…

Read the whole file at its exact version.

How to install

mdr add skillmds/skillmd/security-and-hardening@sha256:6b18a4367eedfb4f

[![mdr](https://markdownregistry.com/badge/art_7jelhabunphnowsc.svg)](https://markdownregistry.com/a/art_7jelhabunphnowsc)

Versions

The registry has recorded 1 version of this file, committed on Sep 19, 2026.

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_7jelhabunphnowsc
GET https://markdownregistry.com/api/v1/resolve?ref=skillmds/skillmd/security-and-hardening
GET https://markdownregistry.com/api/v1/blob/6b18a4367eedfb4fd0d97e6ea6dd3590e0eb77f949eea9686fcc121bc68063f2

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.

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