Day 123 of 2026 building!

Let's learn something very technical. Here is Secure Playground: a local web app for exploring prompt-injection attacks and defensive strategies against LLMs.

What it does:

- Run simulations with seed payloads and mutated variants

- Test configurable defenses (system prompt strictness, HTML stripping, PII redaction, instruction rejection)

- Score and persist experiment results in a leaderboard

Tech: Python 3.10, FastAPI, Jinja2, Agno multi-agent pipeline, OpenAI/Ollama-compatible client adapters.

Try it locally: clone, create a virtualenv, pip install -e . and run `uvicorn secure_playground.app.main:app --reload`.

Contributions welcome - PRs, provider adapters, dockerization, and more.

Code, technical architecture and more in the first comment.

#DailyBuild2026