set-up-security-headers SKILL.md skillB
This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.
set-up-security-headers from velimirmueller/claude-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add velimirmueller/claude-skills/set-up-security-headers@git:20261009.0ae007bPins git:20261009.0ae007b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- velimirmueller/claude-skills
- Path
skills/frontend/set-up-security-headers/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261009.0ae007b, committed Oct 9, 2026
- First version recorded
- Jun 9, 2026
- Size
- 9,570 bytes
- Repository stars
- 5
- License
- MIT
Use when hardening a frontend SPA's delivery — one strict Content-Security-Policy and header set (no unsafe-inline scripts), rendered for the project's host (Netlify, Vercel, or self-hosted Caddy/nginx/Traefik), plus Dependabot hygiene and an honest note on the XSS surface.
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
# Set Up Security Headers Security headers are delivered by the host, not the bundle. The policy is the same on every host; only the file that carries it changes. This skill writes the policy once (step 3), renders it for the project's host (step 4), and wires `connect-src` to the origins the app actually calls. ## 1. Audit current state ```bash cat .claude/stack-profile.md 2>/dev/null || cat ~/.claude/stack-profile.md 2>/dev/null # hosting, ci ls netlify.toml public/_headers vercel.json vercel.ts Caddyfile nginx.conf compose*.y*ml .github/dependabot.yml 2>/dev/null grep -in "content-security-policy\|strict-transport" netlify.toml public/_headers vercel.json vercel.ts Caddyfile nginx.conf 2>/dev/null grep -n "VITE_API_URL\|VITE_REALTIME_URL" src/libs/env.ts 2>/dev/null # origins for connect-src grep -n "<script>" index.html 2>/dev/null # inline scripts break script-src 'self' ``` Pick the host branch from the profile's `hosting` list. If there is no profile, detect it from the files above. | Profile `hosting` / evidence | Branch | |---|---| | `netlify`, or `netlify.toml` | Netlify (4a) | …
Read the whole file at its exact version.
How to install
mdr add velimirmueller/claude-skills/set-up-security-headers@sha256:15b65206ba9583d2The line at the top of this page pins the label git:20261009.0ae007b, 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_jkk2ndug7lifxi2d)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jun 9, 2026 and Oct 9, 2026, about one every 122 days. Its first recorded version is graded A and its latest B.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261009.0ae007b latest | 2026-10-09 | 0ae007b | 9,570 B | B | view · diff |
| git:20260609.c2107a9 | 2026-06-09 | c2107a9 | 3,872 B | A | view |
Audit of the latest version
- fail: No script tag (matched: <script)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9570 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
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
velimirmueller/claude-skills · 5 stars · license MIT · pushed 2026-10-12 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jkk2ndug7lifxi2d GET https://markdownregistry.com/api/v1/resolve?ref=velimirmueller/claude-skills/set-up-security-headers GET https://markdownregistry.com/api/v1/blob/15b65206ba9583d26d0885965793c6396a858c9b65a81ce5fcfe25246906bf89
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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