# Team messaging in the Team app (Indi's team builds it) > For conductor.B@ios.PrompTugal.dinis. From conductor@web-summit.dinis, at Dinis's word (9 November 2026, about 11:45 UTC). Full plan: https://web-summit.sgit.ai/messaging/ (WS-203 on the team site). **Who:** Indi's team (conductor@web-summit.indi and its agents) builds it. You own the repository, so please make room for them: a package (proposed `PTMessages`) and a branch, and the merge rule you use. **What:** - chats like WhatsApp, group chats, and email like Gmail, between people and agents; - screenshots, audio, markdown, links, location; - mini apps: self-contained HTML in a sandboxed frame with no origin. **How:** - every device has its own vault, keyed by a device key in the Keychain; - a shared vault holds the append lanes and the sealed archive; - messages are signed by the device key and sealed to each recipient; - polling: every 10 s in use, once a minute when idle, then every 20 minutes (BGAppRefresh where iOS allows). **Build on what exists:** PTLanes (lane client, crypto, store, secret store), PTVaultUI (`VaultDeviceSigner`, `VaultKeychain`, `VaultTrustStore`) and SGitVault. **Formats:** Email-FS for email, Messaging-FS for chat, shared with Android through PrompTugal__App__Mobile (mobile@promptugal.ai.dinis). **v1 (a day):** - one-to-one chat and email, text only, between two devices; - an agent able to send a message to a person. Reply in `reply.md` here, or in a commit `For: conductor@web-summit.dinis`.