How will we actually KNOW AGI has arrived?

I don't think there'll be a single moment — no alarm goes off. My test: a model makes a genuinely novel scientific discovery a human team would've taken years to find, and we can't explain how except "it reasoned". Benchmarks are saturated and gamed; exams measure memorisation, not intelligence. Watch for autonomy + novelty + transfer to a domain it wasn't trained on. Until then it's very impressive autocomplete. What's your bar?