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Michał Pierzchała

@thymikee • 8,591 subscribers

Principal Engineer for Open Source @callstackio. Core @reactnative Community contributor. Building @agent_device, RN Testing Library, ex-maintainer Jest

Shorts

Fable 5 made every app relaunch in agent-device 6× faster. 𝚘𝚙𝚎𝚗 --𝚛𝚎𝚕𝚊𝚞𝚗𝚌𝚑: 12s → 2s For an AI agent, that's 2.3x faster time-to-interaction. It's verifying and tapping in 5s instead of 13.

Fable 5 made every app relaunch in agent-device 6× faster. 𝚘𝚙𝚎𝚗 --𝚛𝚎𝚕𝚊𝚞𝚗𝚌𝚑: 12s → 2s For an AI agent, that's 2.3x faster time-to-interaction. It's verifying and tapping in 5s instead of 13.

88,373 views

Introducing Agent Device: token‑efficient iOS & Android automation for AI agents 𝚗𝚙𝚡 𝚊𝚐𝚎𝚗𝚝-𝚍𝚎𝚟𝚒𝚌𝚎

Introducing Agent Device: token‑efficient iOS & Android automation for AI agents 𝚗𝚙𝚡 𝚊𝚐𝚎𝚗𝚝-𝚍𝚎𝚟𝚒𝚌𝚎

157,953 views

RNEF is now Rock 🎉 There are two hard things in computer science: naming and cache invalidation. While we've built React Native Enterprise Framework to tackle the latter, I admit, nailing the name was a challenge. So, we fixed it. 𝚗𝚙𝚖 𝚌𝚛𝚎𝚊𝚝𝚎 𝚛𝚘𝚌𝚔

RNEF is now Rock 🎉 There are two hard things in computer science: naming and cache invalidation. While we've built React Native Enterprise Framework to tackle the latter, I admit, nailing the name was a challenge. So, we fixed it. 𝚗𝚙𝚖 𝚌𝚛𝚎𝚊𝚝𝚎 𝚛𝚘𝚌𝚔

29,002 views

What if your cloud agents could use iOS and Android devices just like that? Introducing Agent Device Cloud: hosted on your dusted Mac Mini, used through 𝚊𝚐𝚎𝚗𝚝-𝚍𝚎𝚟𝚒𝚌𝚎

What if your cloud agents could use iOS and Android devices just like that? Introducing Agent Device Cloud: hosted on your dusted Mac Mini, used through 𝚊𝚐𝚎𝚗𝚝-𝚍𝚎𝚟𝚒𝚌𝚎

13,351 views

This basically allows you to run any untrusted JavaScript in your app, whether it's written by 3rd party developers or AI agents

This basically allows you to run any untrusted JavaScript in your app, whether it's written by 3rd party developers or AI agents

13,150 views

Videos

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Last week this session took 9 minutes and 150k tokens on Opus 4.6. Complex app navigation, network debugging, perf profiling on a production app. Justified, right? Not really. Same session today: 69k tokens. 6 minutes. Less than half. Here's how 🧵

Last week this session took 9 minutes and 150k tokens on Opus 4.6. Complex app navigation, network debugging, perf profiling on a production app. Justified, right? Not really. Same session today: 69k tokens. 6 minutes. Less than half. Here's how 🧵

Michał Pierzchała

149,708 views • 3 months ago

run Maestro tests 2x faster on Android with this tool » 𝚊𝚐𝚎𝚗𝚝-𝚍𝚎𝚟𝚒𝚌𝚎 𝚝𝚎𝚜𝚝

run Maestro tests 2x faster on Android with this tool » 𝚊𝚐𝚎𝚗𝚝-𝚍𝚎𝚟𝚒𝚌𝚎 𝚝𝚎𝚜𝚝

Michał Pierzchała

26,360 views • 1 month ago

anyone can optimize performance in React Native apps now, it's really just a single prompt

anyone can optimize performance in React Native apps now, it's really just a single prompt

Michał Pierzchała

32,496 views • 1 month ago

Remote iOS Simulator control from a Linux agent container. One command on the Mac: » agent-device proxy Here’s a remote Claude container connecting to my Mac through a cloudflared tunnel and controlling Maps on an iOS Simulator like it’s local.

Remote iOS Simulator control from a Linux agent container. One command on the Mac: » agent-device proxy Here’s a remote Claude container connecting to my Mac through a cloudflared tunnel and controlling Maps on an iOS Simulator like it’s local.

Michał Pierzchała

13,912 views • 25 days ago

working on a faster boot, interactions, and test replay for agent-device. so far: → 3.4x faster than baseline → 1.5x faster than Maestro (yes, we're adding compatibility layer) shipping this in v0.15 once tested better

working on a faster boot, interactions, and test replay for agent-device. so far: → 3.4x faster than baseline → 1.5x faster than Maestro (yes, we're adding compatibility layer) shipping this in v0.15 once tested better

Michał Pierzchała

22,050 views • 2 months ago

Upgrading React Native apps in 2026 couldn't be easier

Upgrading React Native apps in 2026 couldn't be easier

Michał Pierzchała

45,567 views • 5 months ago

agent-device v0.15 is out. faster than ever on iOS ⚡

agent-device v0.15 is out. faster than ever on iOS ⚡

Michał Pierzchała

17,834 views • 2 months ago

here’s codex controlling my physical iPhone because why not

here’s codex controlling my physical iPhone because why not

Michał Pierzchała

28,921 views • 5 months ago

there's something magical in using the tools your team ships: → Apex: an AI model fine-tuned for React Native dev → agent-device: mobile verification for AI agents → React Native: best mobile cross-platform lib Cost of Apex running this flow for 1 minute: $0.008876

there's something magical in using the tools your team ships: → Apex: an AI model fine-tuned for React Native dev → agent-device: mobile verification for AI agents → React Native: best mobile cross-platform lib Cost of Apex running this flow for 1 minute: $0.008876

Michał Pierzchała

12,939 views • 1 month ago

For a few weeks we've been building agents that are capable of understanding any app and then autonomously convert it to a React Native app. Powered by agent-device and react-native-best-practices skills from Callstack Engineers and some custom instructions DM if you're interested

For a few weeks we've been building agents that are capable of understanding any app and then autonomously convert it to a React Native app. Powered by agent-device and react-native-best-practices skills from Callstack Engineers and some custom instructions DM if you're interested

Michał Pierzchała

10,396 views • 1 month ago

what if your end-to-end tests: → were generated by agents → auto-fix as the app changes → run without AI involved » npx agent-device@latest

what if your end-to-end tests: → were generated by agents → auto-fix as the app changes → run without AI involved » npx agent-device@latest

Michał Pierzchała

22,075 views • 5 months ago

The best build is no build.

The best build is no build.

Michał Pierzchała

33,943 views • 1 year ago

Agents can now easily: → analyze a native crash → fix it → verify the fix without guessing » npx agent-device@0.6.1

Agents can now easily: → analyze a native crash → fix it → verify the fix without guessing » npx [email protected]

Michał Pierzchała

12,757 views • 4 months ago

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