Flask Expert

If you're building anything beyond a basic Flask app, this skill covers the patterns you actually need: application factories, blueprints, SQLAlchemy models with relationships, and JWT authentication that doesn't leave security holes. It walks through Flask-RESTful resources with proper request parsing and response marshalling, plus the extensions ecosystem (Flask-Migrate, Flask-CORS, Flask-Limiter) that turns Flask from a microframework into something production-ready. The code examples show real implementations, not toy demos, like handling pagination, protecting routes with decorators, and structuring endpoints that won't make you cringe during code review. Good for when you're past hello world but before you've memorized every Flask extension's quirks.

skills.sh installs: 223
GitHub stars: 44
last updated: Aug 21, 2026

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Install

$ npx -y skills add personamanagmentlayer/pcl --skill flask-expert --agent claude-code

Installs into .claude/skills of the current project.

Files

Flask Expert

Expert guidance for Flask web development, building REST APIs, using extensions, and production deployment.

Core Concepts

Flask Fundamentals

Routing and views
Request/response handling
Templates with Jinja2
Blueprints for modularity
Application factory pattern
Configuration management

Flask Extensions

Flask-SQLAlchemy (ORM)
Flask-Migrate (database migrations)
Flask-Login (authentication)
Flask-RESTful (REST APIs)
Flask-JWT-Extended (JWT tokens)
Flask-CORS (CORS handling)
Flask-Limiter (rate limiting)

Best Practices

Application structure
Error handling
Testing
Security
Production deployment

Basic Flask Application

from flask import Flask, request, jsonify, render_template
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from werkzeug.security import generate_password_hash, check_password_hash
from datetime import datetime

# Application factory
def create_app(config_name='development'):
    app = Flask(__name__)
    app.config.from_object(config[config_name])

    # Initialize extensions
    db.init_app(app)
    migrate.init_app(app, db)

SKILL.md on GitHub