Kiroween 2026: Build something wicked and git commit to the darkness.

Kiro’s annual Halloween-themed hackathon has returned, and building starts now. Show us how you use Kiro to push boundaries by working across a crew of agents, adding structure with specs, customizing workflows with hooks or steering, streamlining with Kiro powers, or bringing in new capabilities with MCP. Pick a category, build something wicked, and compete for $100,000 in prizes.