Remote MCP server (Streamable HTTP, stateless)

JSON-RPC 2.0 per the Model Context Protocol. Same Bearer key as the REST API. Tools: get_usage, list_agents, list_calls, list_conversations, get_daily_call_stats, get_contact, get_upgrade_options, create_upgrade_checkout (plus request_callback on callbacks-scoped keys). Without any Authorization header the server exposes only the signup tools (start_signup, check_signup_status), so an AI assistant can set up Canarics for a company that has no account yet. Send Accept: application/json, text/event-stream.