Show HN: The AI Lethal Trifecta

If you're building agents, this is worth knowing. Simon Willison (who coined the term "prompt injection") describes three capabilities that are individually fine but devastating together, the lethal trifecta includes:

1. Access to private data (such as internal databases, emails, etc.)
2. Exposure to untrusted content (like web pages and external text)
3. The ability to exfiltrate data (a tool or a channel of sorts that reaches the outside world)

Combine all three in one agent and you've got a perfect storm: untrusted content can hijack the agent into reading private data and then persuade the agent to send it out.

To teach the lethal trifecta, I built a Gandalf-style puzzle: 10 levels, each a real injection concept, with the full trifecta as the final level. It's free, there's no sign up and initially it's beginner-friendly.

See if you can chain all three together and complete the trifecta! You can find more details here.