Subscribe to an issue's activity emails.
With no body you subscribe yourself, using the email your dashboard session
forwards. Passing {"email": …} for SOMEONE ELSE is a create-tier action: it
needs issues:create, and that address must belong to an active member of
your organization. Subscribing yourself works at issues:read, so a
read-only responder who acked can always manage their own notifications.
Idempotent — re-subscribing clears any earlier unsubscribe.
Authorizations
A scoped AgentEye API key. Mint one in the dashboard under Settings → API keys, or with POST /v1/keys. Each endpoint names the permission it requires; a key without it gets 403 and a required_permission field naming what was missing.
Path Parameters
The issue's id.
Body
Optional. Omit the body to subscribe yourself.
Optional override; defaults to the actor's forwarded email so a dashboard user can subscribe themselves with a bare POST.
Response
Subscribed; echoes the email.