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droidpi-proof

The question

Can an agent run on a phone with no runtime?

Not “an app that talks to an agent API”. The agent itself, its event loop, its ESM loader, its session lifecycle, running as a library inside a native Android process.

The verdict

WORKS. A custom-built Node.js runtime (libnode.so, v24.19.0) runs the Pi coding-agent SDK in-process inside a native Kotlin app, end to end on an Android emulator. Events flow between Kotlin and JS over JNI, from agent start to agent settled.

Three stories from the build:

The proof
The evidence: result.json, the event stream, both ABIs, and the caveats.
The build
The reproducible recipe: cross-compiling Node 24 for Android and every fix the build needed.
Lessons
What the build taught about WSL, patches that fail without errors, and long jobs, plus limits and next steps.