Storage Upload
Handle file uploads with Supabase Storage in Next.js — buckets, RLS on objects, signed URLs, image handling, and size/type validation. Use when adding avatars, portfolio images, document uploads, or any user file.
Install
$ agentstack add skill-m-binimran-dev-pack-storage-upload ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-m-binimran-dev-pack-storage-upload) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
storage-upload
User files are untrusted input. Validate, scope access, and never expose a writable public bucket.
Process
- Bucket per purpose, private by default. Public bucket only for genuinely public assets. Set
fileSizeLimit and allowedMimeTypes on the bucket.
- RLS on
storage.objects: users may only write/read paths they own — e.g. key prefixed with their
auth.uid(). Policies mirror the rls-policy skill (using + with check).
- Validate before upload: size and MIME on the client for UX, and again server-side / via bucket limits
for safety. Reject executables and oversized files.
- Serve privately via signed URLs:
createSignedUrl(path, expiresIn)with a short TTL. Don't hand out
permanent public URLs for private content.
- Images: store an original; render through
next/image(or a transform) — sized to avoid CLS.
Strip EXIF if privacy matters.
Output
- Bucket config, the storage RLS policies, the upload handler (with validation), and how files are served
(signed URL vs public).
Guardrails
- Never make a user-writable bucket public-read without considering what else lands in it.
- Path scoping by
auth.uid()is mandatory for private user files. - Size/type limits enforced server-side (bucket), not just in the UI.
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: m-binimran
- Source: m-binimran/dev-pack
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.