harden-backend SKILL.md skillA
harden-backend from velimirmueller/lab-claude-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add velimirmueller/lab-claude-skills/harden-backend@git:20261009.d042141Pins git:20261009.d042141 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- velimirmueller/lab-claude-skills
- Path
skills/backend/harden-backend/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261009.d042141, committed Oct 9, 2026
- First version recorded
- Oct 9, 2026
- Size
- 8,421 bytes
- Repository stars
- 5
- License
- MIT
Use when a backend service is about to take untrusted traffic or fails a security review. Adds edge validation, rate and size/time limits, a CORS allow-list, API security headers, SSRF-safe outbound fetch, safe error responses and CI scanning (Hono, Go, FastAPI).
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
# Harden Backend Nine controls that decide whether untrusted traffic breaks the service. Rules and rationale: [harden-patterns.md](harden-patterns.md). Code per track: [harden-tracks.md](harden-tracks.md). Baseline: [security-baseline.md](../../core/_shared/security-baseline.md) rules 4, 6, 7, 8 and 13. Seam paths: [service-layout.md](../_shared/service-layout.md). The per-caller rate limit keys on the Principal of [set-up-backend-auth](../set-up-backend-auth/SKILL.md); run that first. For a read-only review with severities and no changes, use [audit-security](../../core/audit-security/SKILL.md). ## 1. Audit (change nothing) Read the profile first; detect only what it leaves open ([stack-profile.md](../../core/_shared/stack-profile.md)). ```bash cat .claude/stack-profile.md ~/.claude/stack-profile.md 2>/dev/null # backend.track, package_manager, ci ls src/transport/edge.ts internal/transport/httpapi/edge.go src/*/transport/edge.py internal/platform/safehttp src/*/platform/outbound.py 2>/dev/null # Wildcard CORS (Hono / FastAPI / Go) …
Read the whole file at its exact version.
How to install
mdr add velimirmueller/lab-claude-skills/harden-backend@sha256:a021e03f27e6c174The line at the top of this page pins the label git:20261009.d042141, 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_kdfhkonn3xsfo2lq)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, all committed on Oct 9, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261009.d042141 latest | 2026-10-09 | d042141 | 8,421 B | A | view · diff |
| git:20261009.e2b6168 | 2026-10-09 | e2b6168 | 8,424 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 (8421 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
velimirmueller/lab-claude-skills · 5 stars · license MIT · pushed 2026-10-12 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_kdfhkonn3xsfo2lq GET https://markdownregistry.com/api/v1/resolve?ref=velimirmueller/lab-claude-skills/harden-backend GET https://markdownregistry.com/api/v1/blob/a021e03f27e6c17441dd6ab1836f7e27eceff3176eb019f423ddb8a81cd4cd1d
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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