Dev's open-source agent harness builds playable DOOM in a few prompts
donotfire · reddit · 2026-09-22
Reddit user donotfire showed off 'second-brain', an agent harness they built: after adding Artifacts-like 'widgets', they asked the agent to build DOOM and generate a widget to play it—done in a few prompts.
- The author disclosed the widget was built with Kimi K2.7; the harness also supports local models, limited mainly by VRAM.
- The project is open source at github.com/henrydaum/second-brain, letting anyone try the agent-builds-interactive-apps workflow.
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