# Input Validation

> Validate and constrain untrusted input at the boundary. Use on any handler that accepts external data.

- **Type:** Skill
- **Install:** `agentstack add skill-archive228-loopkit-input-validation`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [Archive228](https://agentstack.voostack.com/s/archive228)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [Archive228](https://github.com/Archive228)
- **Source:** https://github.com/Archive228/loopkit/tree/main/skills/input-validation

## Install

```sh
agentstack add skill-archive228-loopkit-input-validation
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Input Validation
Validate at the edge, before the data touches logic or storage.
- **Schema** — type, required fields, allowed values. Reject unknown fields rather than ignoring them.
- **Bounds** — string length, number ranges, array size. An unbounded input is a DoS and a memory bomb.
- **Format** — emails, UUIDs, dates parsed and re-validated, not trusted as strings.
- **Files** — size limit, type allowlist (check content, not just extension), no path traversal in names.
- Reject with a clear 4xx and a message that says what's wrong — without leaking internals.
Never trust "it comes from our own frontend". The request can come from anywhere.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [Archive228](https://github.com/Archive228)
- **Source:** [Archive228/loopkit](https://github.com/Archive228/loopkit)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-archive228-loopkit-input-validation
- Seller: https://agentstack.voostack.com/s/archive228
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.