security-and-hardening SKILL.md skillA
security-and-hardening from addyosmani/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add addyosmani/agent-skills/security-and-hardening@git:20261029.78f00a4Pins git:20261029.78f00a4 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- addyosmani/agent-skills
- Path
skills/security-and-hardening/SKILL.md- Versions recorded
- 8
- Latest version
- git:20261029.78f00a4, committed Oct 29, 2026
- First version recorded
- Aug 31, 2026
- Size
- 17,578 bytes
- Repository stars
- 113,383
- License
- MIT
Hardens code against vulnerabilities. Use when auditing an input handler for vulnerabilities, when handling user input, authentication, data storage, or external integrations, or when checking a login flow is safe against the OWASP Top Ten. Use when building any feature that accepts untrusted data, manages user sessions or session cookies, or interacts with third-party services. Use when auditing dependencies for known vulnerabilities, triaging package-manager audit findings, or assessing…
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: …
Read the whole file at its exact version.
How to install
mdr add addyosmani/agent-skills/security-and-hardening@sha256:358566859a3d791cThe line at the top of this page pins the label git:20261029.78f00a4, 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.
[](https://markdownregistry.com/a/art_a45vwqebrwoyfbtv)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 8 versions of this file, between Aug 31, 2026 and Oct 29, 2026, about one every 8 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261029.78f00a4 latest | 2026-10-29 | 78f00a4 | 17,578 B | A | view · diff |
| git:20260920.d1463fd | 2026-09-20 | d1463fd | 17,559 B | A | view · diff |
| git:20260918.623af98 | 2026-09-18 | 623af98 | 17,178 B | A | view · diff |
| git:20260907.cda4542 | 2026-09-07 | cda4542 | 27,993 B | A | view · diff |
| git:20260904.45fd4a0 | 2026-09-04 | 45fd4a0 | 27,876 B | A | view · diff |
| git:20260903.020ec10 | 2026-09-03 | 020ec10 | 25,429 B | A | view · diff |
| git:20260831.1483fc1 | 2026-08-31 | 1483fc1 | 24,340 B | A | view · diff |
| git:20260831.1458305 | 2026-08-31 | 1458305 | 25,281 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (17578 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
addyosmani/agent-skills · 113,383 stars · license MIT · pushed 2026-11-01 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_a45vwqebrwoyfbtv GET https://markdownregistry.com/api/v1/resolve?ref=addyosmani/agent-skills/security-and-hardening GET https://markdownregistry.com/api/v1/blob/358566859a3d791c474eb9fa36939b45875c7480d7d4650eaa092dceae2c1c37
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.
More from addyosmani/agent-skills
Every file in addyosmani/agent-skills