Two sessions driving the same phone interleave their taps: on 2026-09-20 a
tap meant for the workout sandbox opened another session's manga reader,
twice. The lease is a flock-guarded JSON file per serial under
~/.cache/phone-lease/, owned by the nearest ancestor `claude` process (one per
session), refreshed on every android_ui call and expiring 180 s after the
last one, so a quiet session frees the phone without anyone remembering to.
A foreign fresh lease makes a call wait up to 60 s, then exit 3 naming the
holder and pointing at the alternatives (the phone's virtual display, the
headless emulator) instead of inviting a retry loop. phone_deploy.sh takes
the same lease (exit 40).
The oldest evidence artifact is pruned to stay under the 60-file cap; it
remains in history.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YbBZqUaNWyhHYfzz6zGC7q
Shared across every repo with an Android surface (screen-locker's workout_app,
todo, dufs-cloud/app). Works against a plain release APK on a physical device
over adb — no root, no emulator, no Flutter debug connection, no app changes.
Driving an app by tapping pixel positions read off a screenshot fails in ways
that look like success. All observed in one session (2026-08-10) verifying
workout_app's Firebase restore:
* A tap aimed at a password field landed with the field unfocused. The typed
password went nowhere and NOTHING errored — the next screenshot just showed
an empty box. type_into/type_into_field now re-read the field and raise.
* Opening the soft keyboard moved a field from y=1572 to y=1319, so a
coordinate captured one step earlier was already wrong. Every action
re-resolves the element immediately before acting.
* A widget behind the keyboard reports its LAID-OUT position (1549) not its
real one (1939) — a 390px error that taps a letter key and reports success.
keyboard_is_up() distinguishes "absent" from "behind the keyboard", and tap
closes the keyboard first.
* KEYCODE_BACK is a route pop in Flutter, not a keyboard dismiss: it navigated
out of Settings and discarded typed credentials, twice. dismiss_keyboard
tries ESCAPE then BACK and verifies via dumpsys input_method.
* `input text` inserts at the cursor, so typing over a filled field produced
"canary@example.com321krzychu@gmail.com". Fields are cleared first.
* uiautomator returns ONLY the focused EditText nodes while a Flutter text
field has focus, and stays that way across retries — so a naive retry loop
never converges. Partial trees are retried and the best result kept.
* An EMPTY EditText has no text, content-desc or resource-id, so a
"must be labelled" filter drops the very field you need to fill in. Editable
nodes are kept regardless and addressable by position.
Ambiguity is an error rather than a silent first-match: `tap "Back"` correctly
refuses when "OFFLINE BACKUP" is also on screen.
Its own test suite caught a real bug in _escape: backslash sat inside the
escape loop, so "&" became "\\&" and a password containing shell
metacharacters would have been typed wrong.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JupKvZCNKRmEeRQY3G1unG
