Show HN: Harness.apk – a drop-in on-device agent for Android

A developer released Harness.apk, a drop-in on-device agent for Android that runs the full agentic loop locally on a phone and uses Claude by default, according to the Show HN post. The developer said the app has been their daily driver since the first version a month ago and has been used to develop itself, citing limitations with Claude for Android's inability to write scripts to the filesystem or generate proper Maps routes. The post notes the experience may vary.

The typical human-agent interaction loop currently looks as follows: operator writes a prompt, agent presents some options to choose from until the requirements become clear, does some work, and finally presents a report of what was actually done. This "specify present" loop scales very well: you can specify a spaceship, a project at work, a vacation plan, or an omelette. I got tired of specifying vacations and omelettes over SSH and remote sessions which depend on a host somewhere to run the actual agent , and got tired of Claude Android's inability to write scripts to the filesystem or make me proper Maps routes, so here you go: harness.apk The full agentic loop on a host that's already in your pocket and online 24/7, with rich widgets in writeups, and with hooks into everything the phone can do. Its been my daily driver since the first version a month ago. Its been used to develop itself, even. Demo video is on the README. Uses claude by default. Experience may vary Comments URL: https://news.ycombinator.com/item?id=49832851 https://news.ycombinator.com/item?id=49832851 Points: 1 Comments: 0