@agent_device

The mobile verification for AI agents. Use with CLI, MCP, or Node.js API. By @callstackio

 Poland
agent-device.dev
Joined June 2026
  • Tweets132
  • Following3
  • Followers796
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MichaΕ‚ PierzchaΕ‚a
@thymikeeOct 20
so I got nerd sniped by @o_kwasniewski with an experimental renderer being faster than agent-device in e2e, so now v0.21.29 comes with: β†’ 2Γ— faster Android taps and verified fills β†’ 18Γ— faster immediate screenshots, β†’ 18% quicker on a 42-test suite enjoy
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MichaΕ‚ PierzchaΕ‚a
@thymikeeOct 15
ok expo simulators are pretty cool. agent-device testing itself like it always does, now in the cloud
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Joe Ryan
@joe_d_ryanOct 15
This is very cool and generally what we are seeing across our best apps. 99 of incident.io's last 144 mobile PRs were written by agents. Now the agents also run each change on an @expo cloud simulator with @agent_device and hand the reviewer screenshots and a video.

AI software reliability platform | incident.io

incident.io is a software reliability platform unifying on-call, agentic root cause analysis, incident response, and status pages – helping teams resolve issues faster.

incident.io
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Mike
@grabbouOct 15
Great article from @incident_io on testing apps in the cloud with agents. Nice insights and explanations on tunneling simulator access from a lightweight VM. Powered by @agent_device and @expo infrastructure!
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Callstack Engineers
@callstackioOct 13
e2e by @TesterArmy runs mobile tests through our open-source @agent_device. Combine goal-based agent actions with exact assertions, then replay cached actions without inference on cache hits. Read how it works on iOS and Android πŸ“– clstk.com/4i1onKP
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Thiago Brezinski
@thiagobrezOct 12
react-native-arrangement-view now runs on @TesterArmy’s e2e + @agent_device, folding the device and testing different postures
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MichaΕ‚ PierzchaΕ‚a
@thymikeeOct 5
Great explainer on e2e, a testing framework by @TesterArmy powered by @agent_device on mobile
Expo
@expoOct 5
Introduction to Verification Engineering In this video, you'll learn: β†’ How to build an agentic loop with @testerarmy's e2e open source testing framework β†’ Run this loop on every PR β†’ What makes e2e different: deterministic AND agentic β†’ The future of agentic development
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Oskar
@o_kwasniewskiOct 1
Introducing e2e The agentic testing framework for any app ~/ npx e2e init β†’ Fully Open Source β†’ Mix deterministic and agentic APIs β†’ Supports web, mobile, and more β†’ Bring your own agent and infrastructure β†’ Run locally or in CI tester.army/e2e
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Mike
@grabbouOct 1
Great to see @agent_device powering the app interaction in @expo bug-fixing workflow. Reproduce the crash, fix it, verify it on EAS Simulator. Bring back recordings for a human to review. Check it out! ⬇️ expo.dev/blog/agent-fixes-bu…

What if your app could fix itself? β€” Expo blog

With EAS Workflows and EAS Simulator, a bug report becomes a pull request with a fix and recordings showing it works.

expo.dev
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szymon
@szdziedzicSep 24
I became a T3 Code user recently - it’s great especially if you have many subs and many machines to manage. I recommend giving it a shot if you haven’t already πŸ‘. I also like in-app simulator preview experience support powered by @expo device hub (for streaming) and @agent_device (for agentic control) 😎
Julius
@jullerinoSep 10
T3 Code now has a device hub to let you and your agent see and manage iOS and Android simulators while working! One of the coolest things (I think) is that the simulator doesn't even have to run on your device! You can setup remote hosts to let agents running on Linux boxes trivially test iOS changes on a Mac Mini! Still early but wanted it out there, lmk any feedback! Available now on nightly!
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MichaΕ‚ PierzchaΕ‚a
@thymikeeSep 22
Any agent can test iPhone Duo apps for you now. No need to do it by hand. Folded, half-open, open, all without stealing your focus or other agents sessions. Just give them @agent_device
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MichaΕ‚ PierzchaΕ‚a
@thymikeeSep 18
Jev playing Flappy Bird like it’s nothing
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Krzysztof
@krzysztof_mochSep 17
You can hire Jev from @typesafeai as your QA tester
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Daniel Williams@Danny_H_WSep 17
The @AgentConf keynote covers Apex, @agent_device Apex now generally available! And free during the conference. Cheap and fast intelligence! apex.callstack.com
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Matt Zatorski
@matzatorskiSep 16
playing around with @eve, spun up a little Mobile Agents Index. compares tools like @agent_device, Argent from @swmansion, @Baconbrix’s serve-sim, and more fully autonomous, run by @vercel’s Eve mobileagents.dev

Mobile Agent Index

Compare mobile automation tools. See what’s supportedβ€”and the evidence behind it. Explore iOS, Android, testing, debugging, profiling, and agent skills.

mobileagents.dev
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Oskar
@o_kwasniewskiSep 12
e2e + agent device πŸ“± I ported React Native Pager View's test suite from Maestro to e2e (a new testing framework I'm building) and... It's 2x faster. we are still iterating on it, but it's very promising.
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Julius
@jullerinoSep 11
Replying to @thymikee
Thanks for agent-device! So far much better than the Codex plugin I’ve been rocking before
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MichaΕ‚ PierzchaΕ‚a
@thymikeeSep 11
T3 Code (Nightly) device panel is pretty cool. Agent clicks around the app, and I can throw modifiers like dark mode and inspect a11y tree. A bit laggy when recording the demo, smooth otherwise. Thanks @jullerino for shipping this
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Julius
@jullerinoSep 10
T3 Code now has a device hub to let you and your agent see and manage iOS and Android simulators while working! One of the coolest things (I think) is that the simulator doesn't even have to run on your device! You can setup remote hosts to let agents running on Linux boxes trivially test iOS changes on a Mac Mini! Still early but wanted it out there, lmk any feedback! Available now on nightly!
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ryu
@ryuhzkSep 9
I absolutely love @agent_device
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