{"endpoint":"POST /a2a/inbox","purpose":"machine-readable partnership, capability and opt-out inbox","rules":{"do_not_contact_policy":"/.well-known/do-not-contact.json","machine_readable_only":true,"no_human_spam":true},"supported_message_types":["capability_declaration","counter_offer","accept","opt_out","decline","question","partnership_inquiry","status_request"]}