Things it built
4 public posts of somebody having an AI agent they text handle things it built, from 4 people, on Instinct and Muse. None reports going wrong; people post successes.
Posts where the agent wrote software because nothing existed: a sync to Things, which has no official API, in a minute or two; a swipe-through tool for unfollowing people on Instagram, in about two; a personal CRM with a dashboard of the user's network, in ten, on the day Instinct announced Files; and a working arrangement between an Instinct and a Muse, negotiated by the two of them over a shared Google Sheet. The Instagram tool worked because the agent was already logged in rather than because the model was better, and its author said so. None of them says where the code runs or who can read it, which is the question the security write-ups answer for one product here and not the others.
Instinct
MuseThe posts, by agent
Instinct
A user gave his Instinct and his Muse access to one Google Sheet and told each it was the channel to the other. He says they introduced themselves, agreed a protocol and their own limits on what to share, then took a vendor lead list from Instinct's backlog and split it into lanes, Instinct on national registries and rental-software storefronts, Muse on wedding directories and franchise locators: 4,700 leads in two hours, no duplicates. A second project had Muse, with no access to the code, review his live app as a user and file bug reports for Instinct's builder to fix, which he says found four UX bugs Instinct's own tests had missed.
Why it is notable
The first outside account of agents from two companies working one job between them, and the join is a spreadsheet rather than either vendor's protocol. Instinct's agent-to-agent capability, on its own pages, is Instinct to Instinct; Meta's pages say nothing about Muse talking to another agent at all. The counts are his and the thread is the only account.
Posted by a user by Zev (@ZevLapin): x.com, 2026-09-18. Added 2026-09-18.
On the day Instinct announced Files, a user had it build him a personal CRM in ten minutes: his relationships categorised, a search across them, contact cards with the context of each relationship, and a dashboard mapping his network, which he says had taken him hours to set up in other tools.
Why it is notable
The first outside account of Files, posted within an hour of the announcement, and a use the company's five examples did not list. His profile says he works at Merit Systems, which makes OpenInstinct, the open-source assistant listed here separately, and runs an assistant benchmark site; neither is Instinct's company. Sixty views.
Posted by a user by David Pawlan (@DavidPawlan): x.com, 2026-09-18. Added 2026-09-18.
Muse
A developer who keeps his to-dos in Things, which has no official API, told Muse to build the sync. A minute or two later, he says, his agent's to-dos were syncing to Things across his Apple devices.
Why it is notable
A connector the agent wrote for itself, to a product that refuses to publish one, which is the second account here of Muse extending its own reach with code, after Meta's engineer showed the same. The user is a former GitHub engineer, so the judgement of what counts as sync is an informed one.
Posted by a user by Zach Holman (@holman): x.com, 2026-09-14. Added 2026-09-17.
A user built himself a swipe-through interface for unfollowing people on Instagram in about two minutes by asking Muse for it, and credits the native Instagram access rather than the model.
Why it is notable
It is the first recorded case of somebody using one of these agents to build a small tool for themselves rather than to run an errand, and what made it possible was not capability but access: the assistant is already inside the account the tool operates on, so there was no integration to authorise and no scraper to write. Every other listing here would need permission it does not have.
Posted by a user by brett goldstein (@thatguybg): x.com, 2026-09-08. Added 2026-09-09.