A documented workflow nothing could execute
A guard blocked the one step a documented runbook required. The fix was not a weaker guard, it was building the sanctioned command it was asking for.
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An auth gate you do not resent
A gate asked too often gets automated away, and one asked once never expires. Charge full authentication only for transitions that change the threat model.
Version state belongs in exactly one file
A version repeated across build files, manifests and tags is one fact with several caches. Decide which copies are derived and forbid everything else.
Your deploy output is a verification surface
A deploy that exits zero proves the commands ran, not that anything shipped. Print the counts that would differ between a real deploy and a no-op.
Two modules with the same name, one is a demo shell
A generator wrote a feature into a template demo module sharing the real one's name. Resolve the target from disk and halt on ambiguity rather than picking.
What a local model does to your battery
Battery cost is attributed at app level and spent at feature level. Measure the delta against a control run, and treat thermal state as part of the result.
The first inference is the one users judge you on
Cold start is a different system from steady state, not the same one measured twice. Treat warmth as a resource with a lifecycle, and measure both numbers.
An external display is a second window, not a bigger one
Android 16 makes external displays a mainstream concern. The layout work is mostly window size classes you already have; the new parts are density, input capability and deciding what belongs on which screen.
Core ML and LiteRT solve the same problem differently
A platform-native runtime and a portable one differ in ways the type system will not catch. What the shared declaration may promise is the whole design.
On-device semantic search over the user's own data
Semantic search on a phone is not a vector-database problem at user scale — it is an index-freshness problem, invisible until someone searches.
Designing the fallback for a device that cannot run your model
A fallback that silently became the default for 303 of 304 artifacts. Detect capability before attempting, and record on every artifact which path ran.
Gemini Nano on-device: what it actually costs you
On-device inference has no per-call bill, and that hides six real costs — eligibility, size, battery, thermal, capability ceiling and operations.