---
title: "Fullstack Guardian - Air Market"
description: "You are building a feature that needs both a screen people use and a server behind it, and security cannot be an afterthought bolted on later. This does all three at once: the interface, the backend,…"
canonical: "https://airmarket.ai/app/fullstack-guardian"
---

[Air Market](/) / [Developer Tools](/category/devtools) / Fullstack Guardian

Skill by [Jeffallan](/@jeffallan)

# Fullstack Guardian

Build the screen and the server behind it, with security in both

## What this does

You are building a feature that needs both a screen people use and a server behind it, and security cannot be an afterthought bolted on later. This does all three at once: the interface, the backend, and the checks that keep it safe, so a form and the endpoint it posts to are built together.

### Top 3 things it does for you

- Build a feature end to end, from database to screen
- Connect a page to the API that feeds it
- Add forms that create, edit and delete records

## Information

**Fullstack Guardian at a glance**

|  |  |
| --- | --- |
| Kind | Skill |
| Publisher | [Jeffallan](/@jeffallan) |
| Category | [Developer Tools](/category/devtools) |
| Works with | Agent Skills - an open standard supported by 40+ agents |
| Version | 1.1.1 |
| Size | 67 KB |
| Licence | MIT |
| Repository | [Jeffallan/claude-skills](https://github.com/Jeffallan/claude-skills/tree/5e8b6b8ff4007414f91f980771047b6136600c34/skills/fullstack-guardian) |
| GitHub stars | 11,146 (as of Nov 2026) |

## Security report

**Verified.** AIR scanned this exact version of Fullstack Guardian and flagged nothing. AIR's verdict: **safe**.

**What Fullstack Guardian's check was run against**

|  |  |
| --- | --- |
| Commit | 5e8b6b8ff4007414f91f980771047b6136600c34 |
| Content hash | e9dccb5f70539e034b0a0449eee786a2579799595f73212a4bac2ed061aef5c1 |
| Files read | [Browse the files at this exact commit](https://github.com/Jeffallan/claude-skills/blob/5e8b6b8ff4007414f91f980771047b6136600c34/skills/fullstack-guardian/SKILL.md) |

A scan is named by the exact content it read, not by a version number. A different version is a different artifact, and nothing here applies to a version AIR has not scanned.

[Read the full security report for Fullstack Guardian](/security/fullstack-guardian)

## About Fullstack Guardian

This builds full-stack web applications with security at every layer. It covers the complete stack from database to UI, enforcing auth, input validation, output encoding, and parameterized queries across all layers.

Use it when a feature spans frontend and backend at once: building REST APIs with the UI that goes with them, connecting frontend components to backend endpoints, creating end-to-end data flows from database to UI, or implementing CRUD operations with UI forms.

What separates it from frontend-only, backend-only, or API-only work is that it holds all three perspectives, frontend, backend and security, inside a single implementation workflow. It also covers authenticated API routes with views, microservices, real-time features, monorepo architecture, and technology selection decisions.

## What's inside

- SKILL.md - instructions
- references/api-design-standards.md - reference
- references/architecture-decisions.md - reference
- references/backend-patterns.md - reference
- references/common-patterns.md - reference
- references/deliverables-checklist.md - reference
- references/design-template.md - reference
- references/error-handling.md - reference
- references/frontend-patterns.md - reference
- references/integration-patterns.md - reference
- references/security-checklist.md - reference

## Questions

### Is Fullstack Guardian safe to install?

AIR scanned this exact version of Fullstack Guardian and flagged nothing. AIR's verdict: safe. The verdict is named by the content that was read, at commit 5e8b6b8ff400, so it cannot drift onto a version nobody scanned. The full report is at https://airmarket.ai/security/fullstack-guardian.

### How do I install Fullstack Guardian?

Open https://airmarket.ai/app/fullstack-guardian on Air Market and use the install action: Air Market hands Claude a prompt naming this exact skill, and Claude sets it up. Source, pinned to the exact commit this listing describes: https://github.com/Jeffallan/claude-skills/tree/5e8b6b8ff4007414f91f980771047b6136600c34/skills/fullstack-guardian. Install from that link, not the branch.

## Related on Air Market

- [More Developer Tools listings](/category/devtools)
- [Everything by Jeffallan](/@jeffallan)

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Canonical URL: <https://airmarket.ai/app/fullstack-guardian>