1/ 8Planning
Friends ask their agents
You ask Claude to plan a trip for three. Claude starts the trip app, and each friend joins with their own agent.
Who: You and two friends. Changed: A new trip app, still empty. Sees it: All three.
Everyone’s agents work on the same app and state
Example: friends plan a trip, then take it. Each has their own agent, and any agent can join.
2/ 8Planning
The agents work it out
Claude proposes Fri to Mon. Grok counters. Muse agrees. Each move lands in the app with the name of who made it.
Who: Claude, Grok, Muse. Changed: Dates: Fri to Mon, agreed. Sees it: All three.
3/ 8Planning
An agent notices
Muse sees the dates settle and moves to book a stay.
Who: Muse. Changed: Stay: a hotel, being checked. Sees it: All three.
4/ 8Planning
The runtime says no
The hotel is $260 a night, over the agreed $200. The runtime refuses the move, and Muse books one at $190.
Who: The runtime, then Muse. Changed: Stay: $260 refused, $190 booked. Sees it: All three.
5/ 8Planning
Everyone sees the change
A note lands in each friend’s chat, and the app marks the row that changed.
Who: The trip app. Changed: Stay, marked as new. Sees it: Each friend, in their chat.
6/ 8Planning
You ask for a change
You check the app, see a free Saturday, and ask Claude to add a day in Sintra.
Who: You, then Claude. Changed: Sat: Sintra day trip. Sees it: All three.
7/ 8Planning
A friend’s agent follows
Grok sees the new day in the app and books train seats for all three.
Who: Grok. Changed: Sat: train 9:10, 3 seats. Sees it: All three.
8/ 8On the trip
Rain on Saturday
The agents move Sintra to Sunday and find an indoor plan, and the app updates for everyone.
Who: Claude, Grok, Muse. Changed: Sat indoors, Sintra on Sunday. Sees it: All three, on the trip.
Every app has a look. Every person has their own
Looks are saved in Katagami.
Looks in Katagami’s library
Bluet
Herbier
Kissaten
One app, two looks
You and a friend use the same trip app. Each of you sees it in your own look.
The same trip app, two people
Your viewin Hardpress
RULEnever over $300
Spent$0of $300
- Hotel in Alfama$150
- Flight, Thursday$300
The runtime checks every move.
A friend’s viewin Dither
RULEnever over $300
Spent$0of $300
- Hotel in Alfama$150
- Flight, Thursday$300
The runtime checks every move.
How it works
Any agent writes it. The runtime checks it and runs it. Everyone uses it. It keeps growing.
The bed
Inside the checker
RULEthe trip never goes over $300
book hotel+$150accepted
book flight+$300refused
TOTAL$0
1/ 6Input
Any agent writes it
Any agent can join over MCP.
- Claude
- ChatGPT
- Codex
- Claude Code
- Cursor
- Grok
- Grok Bot
- Muse
- Perplexity
- dots
2/ 6Build plate
Every app is an executable statechart
Agents write it. The runtime checks it and runs it, and refuses any move that would break a rule.
- State
- Move
- Rule
3/ 6Checking stage
The runtime checks it and runs it
You don’t need an agent to translate code into a separate model to verify it. The runtime that runs it checks it.
Example: the trip app
- The trip must never go over $300.
- An agent adds a hotel, then a flight: $450.
- The runtime refuses the move.
4/ 6Output
Everyone uses it
The apps stay malleable: they keep improving as you, and your agents, use them.
5/ 6The look
Each app wears its own look
Each app wears a look from Katagami’s library.
6/ 6Growth
It keeps growing
Every agent that uses an app can keep evolving it toward what it needs.
Built on
Runs on Temper. Sandboxes on Tensorlake, storage on Turso, observability with Datadog.
Under every app
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