harness-engineering

Harness Engineering: What I learned from 24,000 prompts building production apps

Since early 2026 I've been building my own harness around Claude Code. What held, who checks the agent's work, and what it actually costs.

Android

I Gave My AI Agent Eyes: Introducing ComposeProof

I write a lot of Compose UI with an AI coding agent now. It's fast at producing composables and completely blind to what they actually look like. It writes the code, says it's done, and the first time anyone sees whether the empty state overflows or

Authority Is a Feature, Not a Value

Most orgs treat "ownership" as a culture problem. It's not. It's a missing feature - the same way a form with no validation isn't a training issue, it's a spec gap. Every engineering culture doc I've read says

Compose State Has No Name

Four walls between you and a flight recorder for Compose state — verified against androidx source.

Engineering

How I Tamed My Claude Code Usage: A Token Optimization War Story

How a quick Slack thread about rate limits led to diagnosing a massive token leak in Claude Code and the exact steps taken to cut weekly API usage from 460M down to 212M tokens.

ai

The Correction Tax: What AI Speed Actually Costs You

352 commits in 25 days. 179 AI sessions. One person doing the output of a small team. Here's what that actually looks like when you're honest about it.

Introducing Rebound: context-aware recomposition budgets for Compose

We had stable data in prod for months. One feature change broke it. We shipped it. Nobody caught it because the recomposition count didn't look unusual — it just looked unusual for that composable. No existing tool makes that distinction. So we built one. Introducing Compose Rebound.

Android

The Compose Styles API: Building 8 Labs to Master Declarative Styling

Hands-on exploration of compose-foundation 1.11.0-alpha06's experimental Styles API. 8 interactive labs covering interaction states, transforms, and more.

Android

Hunting the Play Store Heisenbug: R8, ART Verify Mode, and Firebase Init Races

App crashes with "FirebaseApp is not initialized" only in Play Store Pre-Launch Reports? Fresh installs run in ART's interpreted mode, turning a 1ms race into 100ms+. A deep dive into verify mode, R8 Full Mode, and the latch fix.

Building StickerExplode(Part 1): Gestures, physics, and making stickers feel real

Part 1 of three. This one covers the gesture system, spring physics, peel-off animation, and die-cut rendering. Part 2 gets into the holographic shader, tilt sensing, haptics, and cross-platform architecture. I built a sticker canvas app. You slap stickers on a surface, drag them around, pinch to resize, rotate with

Building StickerExplode(Part 2): The peel-off effect and holographic shimmer

Part 2 of three. Part 1 covers what the app is and the tech stack. This one goes deep on two features. Part 3 is the full end-to-end build. Two things people ask about most: the peel-off grab (sticker lifts with a shadow when you touch it) and the holographic

Building StickerExplode(Part 3): The full end-to-end build

Part 3 of three. Part 1 covers what the app is. Part 2 goes deep on the peel-off effect and holographic shimmer. This one walks through everything else: die-cut rendering, tilt sensors, haptics, persistence, and the cross-platform architecture. Part 2 covered the peel-off grab and holographic shimmer. But a sticker