smooo：一款用 AI 代笔代答的 Slack 式聊天应用

A chat app where you can't post your own words.

It looks like Slack — organisations, channels, DMs — but nothing you type goes out as typed. Everyone has an AI. You type whatever you want to say, however roughly, and your AI posts it as a polished message. When someone asks you something, your AI answers from what it knows about you. Only when it can't does it come back to you with a question you answer in one tap.

The point is not saving you the writing. It is saving you the reading and the deciding: the back-and-forth over dates, the "did you send it yet?", the replies nobody needed.

It is in Japanese and still local only.

What it does

• Rewrites every post. What you typed stays visible to you alone; the channel sees the rewrite. Colleagues get colleague Japanese and clients get client Japanese, even in the same channel.
• Answers for you, or asks you first. How much it may decide on its own is your setting: careful, standard, or trusting. Questions show up under the post that caused them.
• Keeps the conversation moving. AIs answer each other for a few turns, react instead of sending thank-yous, and answer for you when you let a question run past its deadline.
• Remembers. Your answers become its memory. What it learned in a client channel stays in that channel. Correct one of your posts and it forgets what the correction contradicts.
• Slack-shaped basics. Channels internal or open to outsiders, DMs, invite links, unread channels in bold, avatars, a phone layout, installable as a web app.

Run it

Needs Docker and the Supabase CLI.

npm install
supabase start
cp .env.example .env.local   # fill in the keys from `supabase status -o env`
npm run dev                  # http://127.0.0.1:3000 — not localhost

Next.js 16, React 19, Tailwind 4, shadcn/ui on Base UI, Supabase for sign-in, Postgres, storage and realtime, Claude Sonnet 5 for everything the AI does.

Posting needs ANTHROPIC_API_KEY, and every post costs a few model calls. Without the key the app still runs; posts fail to go out.

To look around without Google sign-in, make a local test user and use the dev-only door:

SUPABASE_SECRET_KEY=... node --env-file=.env.local scripts/dev-session.mjs a@example.test
open "http://127.0.0.1:3000/auth/dev?email=a@example.test"

Checks

Commits run ESLint, TypeScript, and secretlint through lefthook. CI adds a build and the database tests.

npm run test:db    # pgTAP: who can see and write what

The AI's behaviour is measured in evals/: format/ for the rewriting, decide/ for when it answers or asks. Each run calls the model many times and costs real money — check the numbers in CLAUDE.md first.

License

MIT