How to use Grok Bot to test companion apps
Grok Bot helped prepare and test companion-app changes across several platforms. The author reported five merged PRs and a Windows build break caught on real hardware after cloud CI missed it.
x.com
Prompt to try
Editorial adaptation, not the source author’s exact prompt. Replace bracketed inputs and review tool permissions first.
For [companion-app repositories], add [demo/screenshot mode] and update [website]. Prepare the iOS changes and draft an App Review reply using [review message]. Run relevant tests on [Mac], [Windows PC] and [Linux machine], and report any failures that differ from cloud CI. Present PRs and the reply for my review.
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See placements →What happened
The author reported five merged PRs, 93 and 556 tests green for companion-app work, a 599-test iOS PR, and a Windows build break caught that cloud CI missed.
Reported by @mariusfanu on XHow the agent did it
- Added a demo/screenshot mode for Linux and Windows companion apps.
- Updated the website as part of five merged pull requests.
- Built an iOS pull request and drafted an App Review reply.
Where a person stepped in
The author reported merging five PRs; the post does not describe the review process or whether the iOS reply was sent.
A person approved each step before the agent continued.
@mariusfanu reported merging five pull requests across Rust, WinUI and the web with Grok Bot. The work included a demo and screenshot mode for Linux and Windows companion apps, along with a website update. The post reports 93 and 556 tests green for the companion-app work, without explaining how those totals were divided between the changes.
The iOS work had a different reported status: the bot built a pull request with 599 tests and drafted an App Review reply. The author did not say that this iOS pull request had been merged or that the reply had been sent. Those distinctions keep the delivered changes separate from the work prepared for subsequent action.
Testing extended to the author's actual Mac, Windows PC and Linux machine. That testing caught a Windows build break that cloud CI had missed. The source does not identify the cause of the break or describe its repair.
Who it's for: Developers maintaining companion apps across multiple operating systems who want help preparing changes and checking them on their own hardware.
Prompt
Suggested prompt (written by Agents In Use, not the author's)
Source: X · @mariusfanu
Frequently asked questions
What changes did the author merge?
The author reported five merged PRs across Rust, WinUI and the web, covering a demo/screenshot mode for Linux and Windows companion apps plus a website update.
What did testing on real machines catch?
The bot tested on the author’s Mac, Windows PC and Linux box and caught a Windows build break that cloud CI missed.
Was the iOS work also merged?
The source says the bot built a 599-test iOS PR and drafted an App Review reply. It does not report merging that PR or sending the reply.
More details
Remaining steps
- Tested changes on the author’s real Mac, Windows PC and Linux box.
- Caught a Windows build break that cloud CI had missed.
About this account
The bot built an iOS PR, drafted an App Review reply and tested changes on the author’s real machines.
Platform: X. Attribution: https://x.com/mariusfanu/status/2108874865688133814. Prompt: Suggested (written by Agents In Use, not the author's). Sourced by the Agents In Use pipeline.
Credit: @mariusfanu on X
Source published 10 Oct 2026
Source checked 14 Oct 2026
Tools and topics
Grok Bot · Rust · WinUI · Cloud CI · Mac · Windows PC · Linux
Cross-platform apps · Testing · Pull requests
Editorial completeness: 100/100. Measures documented fields, not agent performance or verified outcomes.