fetchsandbox/playground ? reverse-engineered prompt

Build me a small Python playground with a handful of tiny web apps that each connect to a different third party service, and make one app where the integration is already working from scratch.

I want each app to be simple and fast to run locally, with a basic API, clear instructions, and a few realistic bugs hidden in the integrations so an agent can investigate what is broken and prove it with a receipt or note. One app should be a clean setup task where the integration is only partially wired and needs to be finished. Another app should be about testing and finding a planted bug in an existing setup.

Keep the apps lightweight, easy to start, and written in a way that makes it obvious what each one is supposed to do. Add a short README for each app, a main project README, and a simple way to save findings into a markdown file so someone can open a pull request with what they discovered. If you need current docs for the third party services, look them up online.