Prioritize safely
Classification is separated from mailbox mutation.
Communications
Communication with an authority boundary.
Signal can classify, draft, route, and follow up while keeping sending authority, identity, and delivery evidence explicit.
A draft is not a send. A provider response is not proof of delivery.
Human-controlled effects
Prepare quickly. Send deliberately.
Read, summarize, and draft can remain reversible preparation. External delivery is a separate governed transition with its own actor, scope, and receipt.
Review before effect
Prepared language grants no sending authority.
Record the outcome
Provider events reconcile to an immutable lifecycle.
Channel independent
Identity is not a phone number or inbox.
Endpoints are routing details. Signal keeps the principal, organization, consent, and policy boundary above any one transport.