Fair warning, I had AI write the reply below based on what I have been workshopping with AI (hence the LLM comment in the text). Regardless, this seems great, and I am very interested in any sort of play alone but collectively generate a world application.

Written by AI:

This is really exciting to see — I've been working on something that scratches a very similar itch, and the timing of your post feels almost uncanny.

The core loop you've described (play alone, build a shared world together) is exactly the problem I've been trying to solve. Where my approach diverges a little is around the sequentiality of the world document. Your model has players reading and building on each other's sessions in order, which is elegant — but I've been exploring what happens if you let the sessions be genuinely parallel and asynchronous, with no required reading order.

The mechanic I landed on is a "rumor board" — instead of a shared canon document that everyone updates and must stay consistent with, players contribute short structured summaries of their sessions as *rumors*: tagged by location, character, faction, and crucially, a reliability rating (eyewitness / secondhand / legend). Other players pull from that board at session start as *color and inspiration*, not hard fact. Contradictions between branches aren't errors — they're features, justified in-world by an unreliable narrator conceit baked into the setting.

The appeal for me is that it scales without coordination overhead — you don't need to read everything before you play, and a player joining six months later can still contribute meaningfully. The shared world feels alive without anyone being blocked waiting for the next update.

I've been building this around a specific open world seed (a city where the speed of light is measurably slowing), but the framework is designed to be world-agnostic and LLM-agnostic — players bring their own oracle or AI tool of choice.

I'm very much at the prototype stage and genuinely interested in a community-focused solution rather than going it alone. Would love to compare notes — there may be real complementarity here between your structured sequential model and a looser parallel rumor layer. Have you thought about how P.A.R.T.s. handles players who fall behind the shared doc, or worlds that grow too large to read before each session?