backend-files SKILL.md skillA
backend-files from bekaku/java-spring-boot-starter is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add bekaku/java-spring-boot-starter/backend-files@git:20260924.15dc64aPins 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-files/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260924.15dc64a, committed Sep 24, 2026
- First version recorded
- Sep 21, 2026
- Size
- 3,444 bytes
- Repository stars
- 31
- License
- none declared
Use when a change reads, writes, deletes, lists, uploads, downloads, streams, or serves files — FileManager/FilesDirectory endpoints, CDN/public paths, chunked upload and merge, HTTP Range streaming, image processing, or any filesystem path handling — 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 Files — Playbook
> **Role:** HOW to change file handling safely. Binding facts + evidence: `skills/backend/FILES.md` (read it too).
> **Requires:** `backend-core`. **Usually paired with:** `backend-security` (ownership), `backend-data` (metadata), `backend-testing`.
## Know this first
- The upload root **is** the public `/cdn/**` root. Anything saved there is downloadable without login.
- DB rollback does not undo file writes or deletes.
- Path containment only proves "inside the root", not "belongs to this user".
## Recipe A — store a new kind of file
1. Decide: public (served via `/cdn/**`) or private. Private files must not be reachable through `/cdn/**`; serve them through an authenticated, owner-checked endpoint.
2. Generate the filename on the server; build the path from the configured root; verify containment after resolving.
3. Order the steps and define cleanup:
```text
write file to final path
→ save FileManager row (@Transactional service method)
→ if the save fails: delete the written file (log, do not swallow)
```
4. Record the owner (`created_user` via audit, or an explicit owner id from `auth.getId()`).
…Read the whole file at its exact version.
How to install
mdr add bekaku/java-spring-boot-starter/backend-files@sha256:ecfa1f73279a1b0eThe 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.
[](https://markdownregistry.com/a/art_otye3hnc7nzuhh6i)
3 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 | 3,444 B | A | view · diff |
| git:20260923.b5acb6d | 2026-09-23 | b5acb6d | 1,985 B | A | view · diff |
| git:20260921.de5eb9f | 2026-09-21 | de5eb9f | 1,207 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 (3444 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
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_otye3hnc7nzuhh6i GET https://markdownregistry.com/api/v1/resolve?ref=bekaku/java-spring-boot-starter/backend-files GET https://markdownregistry.com/api/v1/blob/ecfa1f73279a1b0e8f326e05472b6e7a0447cd682ccc5c8d00c3149089ece4d2
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.