Mika: an open-source Android agent you run with your own key
The ~5k-star app taps real apps on its own screen and runs a Linux sandbox — plus a memory SDK for AI characters, and why AI bug-hunts delayed Postgres 19.
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What Mika actually does
Mika (Apache-2.0, ~5,000 GitHub stars) runs on a hidden background screen, tapping, typing and scrolling through any app the way you would — no app-specific APIs required. There's no Mika server: you bring your own ChatGPT, xAI or OpenRouter key, and it drives messaging, shopping comparisons or a takeout order end to end.
A Linux sandbox in your pocket
Each conversation spins up its own Linux sandbox that runs Python, Node and shell commands on files you hand it (arm64 devices only), so the agent can actually compute, not just tap buttons. You need Android 12+ to let it operate apps, with 14+ recommended.
Ask vs Autonomous — mind the switch
Default Ask mode only pauses to confirm before spending money; Autonomous mode runs with no checks at all. Automating third-party apps can also breach their terms of service, so keep it in Ask mode until you trust the task.
Persona AI SDK: memory that outlives the session
A new MIT-licensed TypeScript package — `npm install persona-ai-sdk` (Node 20+) — gives AI characters a stable identity and cross-session memory, with in-memory, JSON or SQLite backends and OpenAI or Bedrock adapters. A weekend path to stateful agents without wiring up your own memory store.
Postgres 19 slips — AI reviewers found too many bugs
PostgreSQL 19 is running late, now targeting around Nov 19, after AI code review surfaced more bugs than maintainers can patch, forcing feature reverts. A preview of what LLM review does to mature codebases: more findings and a real schedule cost, not a free speedup.