Create a monitor. kind=http (needs url), tcp (target "host:port"), tls (target host[:port] — cert-expiry watch), domain (target — registration-expiry via RDAP), dns (target + rtype A/AAAA/MX/... , optional expect_value), heartbeat (dead-man’s switch for cron jobs/agent loops: needs name; response includes ping_url to curl from the job, and a ping_email address). Common options: name, interval (seconds, min 60), tags. http options: expect ("2xx,301"), keyword, keyword_absent:"absent", slow_ms (number or "auto"), method, headers, body, json_path/json_expect, header_name/header_expect. heartbeat options: grace (seconds), cron ("0 3 * * *") + tz, max_duration_s. Any other documented field (see /llms.txt) also works — extra properties are passed through.