file-upload-fullstack

A skill for building complete file-upload flows, from a drag-and-drop interface to cloud storage and content delivery.

In plain words
What is it for?
Use it when implementing browser uploads, presigned upload links, multipart uploads, backend confirmation, or CDN delivery.
Why use it?
It addresses the work of uploading files directly to services such as Amazon S3 or Google Cloud Storage, showing progress and confirming the upload without sending the file through your own server.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/blunotech-dev/agents/file-upload-fullstack
Any agent
npx skills add blunotech-dev/agents --skill file-upload-fullstack
Clone the repo
git clone --depth 1 https://github.com/blunotech-dev/agents

Made for: Claude Code, Codex.

Per session 75 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,163 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00075 $0.03163
Opus 5 $0.00037 $0.01581
Sonnet 5 $0.00015 $0.00633
Haiku 4.5 $0.00007 $0.00316

Measured yesterday against content hash 7dc9878076ea, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

file-upload-fullstack scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

const uploadRes = await fetch(uploadUrl, {
fullstack/file-upload-fullstack/SKILL.md · 351 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 351 lines · 75 tokens per session scan A 7dc9878076ea

Subscribe to this mod's changes

file-upload-fullstack is a skill published in the GitHub repository blunotech-dev/agents (2 stars, last pushed 3mo ago), with no licence file. It adds 75 tokens to every session and 3,163 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.