Skip to content
Get packs

Fullstack Guardian

Builds security-focused web features spanning database, API, and UI with auth and validation at each layer

Source Download skill
Repository
Jeffallan/claude-skills
Stars
12,176
Licence
MIT
Files
11 files

What it does

When installed, the agent plans and builds full-stack web features (database, backend API, and frontend UI) together, applying security checks at every layer: authentication, authorization, input validation on client and server, output encoding, and parameterized database queries. It follows a workflow of gathering requirements, writing a short design document, running a security checklist, then implementing and testing in small steps. It also loads reference guides on topics such as error handling, API design, and architecture choices when relevant.

Great for

  • Developers building CRUD features or REST endpoints with matching UI forms
  • Teams wanting a security-first checklist applied to new web features
  • Developers making technology selection or monolith versus microservices decisions

Skip it if

  • Projects that only need a frontend or only a backend change, since the skill is designed around the full stack and may add unnecessary structure
  • Production security sign-off: the guidance is a checklist and examples, not an audit, so a qualified security review is still needed for sensitive systems

Try asking

  • “Build a full-stack feature to let users update their profile, with a REST endpoint and form”
  • “Add an authenticated API route and connect it to a React component with error handling”
  • “Design the data flow from database to UI for a new orders dashboard”
  • “Help me choose between a monolith and microservices for this web app”
Step-by-step guide: how to use Fullstack GuardianInstall, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 11 original files, the MIT licence and an attribution note.

    fullstack-guardian.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip fullstack-guardian.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip fullstack-guardian.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • State your acceptance criteria and stack (for example FastAPI and React) up front so the agent's examples match your project
  • Ask the agent to write the design document first and review it before any code is generated
  • Treat the generated security notes as a starting point and verify auth and authorization logic with tests

What's inside

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

Redistributed unmodified from Jeffallan/claude-skills under the MIT licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.