Unrestricted File Upload Anti Pattern

Name: Unrestricted File Upload Anti Pattern
Author: igbuend

Checked

igbuend·vlatest·security·MIT

Detects and flags suspicious file uploads bypassing security measures, preventing malicious content from entering systems.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

Run this in your project

terminal

$ npx skills add igbuend/grimbard --skill unrestricted-file-upload-anti-pattern -a claude-code

Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

igbuend

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned 2 Oct 2026

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

Declares what it does: passed
SKILL.md parses and declares a name and a description.
SKILL.md exists, its frontmatter parses, and it declares a name and a description.
No undeclared network calls: passed
Makes no network calls.
Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.
No obfuscated payloads: passed
No encoded or obfuscated payloads.
No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.
No credential access: passed
Reads no keys, tokens, keychains or credential files.
Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.
No pipe-to-shell installers: passed
No pipe-to-shell or download-and-run installers.
No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.
Pinned to a commit: passed
Scanned igbuend/grimbard at cde088f5d7.
The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit: cde088f5d7
Manifest: skills/unrestricted-file-upload-anti-pattern/SKILL.md
Scanned: 1 file, 140 lines

This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.

What each check looks for →

About this skill

What it does

This skill identifies and prevents AI agents from attempting unrestricted file uploads, a common security vulnerability. It analyzes user prompts for patterns indicative of attempts to upload files without proper authorization or validation. The anti-pattern aims to block these actions and provide informative feedback to the user about why their request was denied.

When to use it

When building AI agents that interact with systems where file uploads are possible, but must be strictly controlled.
To proactively prevent potential security breaches related to unauthorized file uploads.
In environments requiring strict adherence to data governance and compliance policies regarding file handling.
During development and testing phases to identify and mitigate vulnerabilities early on.

Key capabilities

Pattern recognition of unrestricted file upload attempts in user prompts.
Blocking of identified malicious requests.
Provision of informative feedback to the user explaining why their request was blocked.

Example prompts

"Upload this document to the server."
"Can you put this file somewhere?"
“Send this attachment.”

Tips & gotchas

This skill is a preventative measure and relies on prompt analysis; it's not a replacement for robust backend security measures. Ensure your agent’s underlying systems have proper authorization and validation controls in place for file uploads.