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backend-security SKILL.md skillA

backend-security from bekaku/java-spring-boot-starter is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add bekaku/java-spring-boot-starter/backend-security@git:20260924.15dc64a

Pins git:20260924.15dc64a in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: bekaku/java-spring-boot-starter
Path: .agents/skills/backend-security/SKILL.md
Versions recorded: 3
Latest version: git:20260924.15dc64a, committed Sep 24, 2026
First version recorded: Sep 21, 2026
Size: 4,861 bytes
Repository stars: 31
License: none declared

Use when a change affects who can call an endpoint or see a row — public vs protected routes, JWT/cookie/Bearer/X-API-KEY authentication, refresh tokens and sessions, @PreAuthorize permission codes, owner scoping, signup, OTP, or password reset — in this Spring Boot backend.

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

# Backend Security — Playbook

> **Role:** HOW to change access behavior without opening holes. Binding facts + evidence: `skills/backend/SECURITY.md` (read it too).
> **Requires:** `backend-core`. **Often paired with:** `backend-api`, `backend-data`, `backend-testing`.

## Know this first

- Access is decided in three places: route rules (`WebSecurityConfig`), the credential filter (`JwtTokenFilter`), and method/data checks (`@PreAuthorize` + owner predicates). Check all three.
- The principal is `AppUserDto` with **no authorities**. Use `@permissionChecker.hasPermission('code')`, never `hasRole` / `hasAuthority`.
- The principal holds only `id`, `token`, `accessTokenId`. `auth.getUsername()` / `getEmail()` are `null` — load the user via `AppUserService` if needed.
- JWT requests must also send an `Accept-Apiclient` header (any non-empty value today), or the filter returns `401`. Include it in tests and curl examples.
- `AuthorizationInterceptor` and `CustomPermissionEvaluator` do nothing. `X-User-Id` / `_sid` are not identity.

## Recipe A — protect a new admin endpoint
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add bekaku/java-spring-boot-starter/backend-security@sha256:0a8543f0fc502e9a

The line at the top of this page pins the label git:20260924.15dc64a, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_yu7lsx66si4oev4m.svg)](https://markdownregistry.com/a/art_yu7lsx66si4oev4m)

5 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 3 versions of this file, between Sep 21, 2026 and Sep 24, 2026, about one every 2 days.

version	committed	commit	size	audit
git:20260924.15dc64a latest	2026-09-24	15dc64a	4,861 B	A	view · diff
git:20260923.b5acb6d	2026-09-23	b5acb6d	2,155 B	A	view · diff
git:20260921.de5eb9f	2026-09-21	de5eb9f	1,378 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the 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 (4861 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

bekaku/java-spring-boot-starter · 31 stars · license none declared · pushed 2026-11-03 · branch master

API

GET https://markdownregistry.com/api/v1/artifacts/art_yu7lsx66si4oev4m
GET https://markdownregistry.com/api/v1/resolve?ref=bekaku/java-spring-boot-starter/backend-security
GET https://markdownregistry.com/api/v1/blob/0a8543f0fc502e9a3deb173ec74cd55d1ca25e561e6715a55d0f3bcf52ce4e18

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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