secondsky/claude-skills · plugins/defense-in-depth-validation/skills/defense-in-depth-validation/SKILL.md

defense-in-depth-validation skillA

defense-in-depth-validation is agent-read markdown (skill) from secondsky/claude-skills: Validate at every layer data passes through to make bugs impossible. Use when invalid data causes failures deep in execution, requiring validation at multiple system layers..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add secondsky/claude-skills/defense-in-depth-validation@v1.1.0
Exact content
mdr add secondsky/claude-skills/defense-in-depth-validation@sha256:bde5acdddbfa5ada

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_r6w3x5gvyde2o3pu.svg)](https://markdownregistry.com/a/art_r6w3x5gvyde2o3pu)

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Versions

versioncommittedcommitsizeaudit
v1.1.0 latest2026-07-19 059fc9f 5,321 BA view · diff
v1.1.02026-04-02 75421fa 3,922 BA view · diff
v1.1.02026-04-02 89c5e89 3,909 BA view · diff
v1.1.02025-12-24 ba827ce 3,895 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, 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 (5321 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

secondsky/claude-skills · 219 stars · license MIT · pushed 2026-09-17 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_r6w3x5gvyde2o3pu
GET https://markdownregistry.com/api/v1/resolve?ref=secondsky/claude-skills/defense-in-depth-validation
GET https://markdownregistry.com/api/v1/blob/bde5acdddbfa5adaeeda1fe6c4cde76128587f50e09cf765606d60ff975660c5

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.