All tests run on an 8-year-old MacBook Air.

All results from shipping 7 Mac apps as a solo developer. No sponsored opinion.

HiyokoHelper explains terminal commands and warns when they're dangerous. Building the danger detection layer was more interesting than I expected.

Why bother with local detection

The obvious approach: send the command to Gemini, ask if it's dangerous.

The problem: you want the warning to appear before the user runs the command — ideally as they're looking at it. Gemini latency (even fast) adds friction. A local check is instant.

Use local detection for obvious cases.…