{"source":"https://api.gridrock.ai/mcp","tool":"read_at","scope":"mh36","archetype":"now","cell":{"admin_code":493,"cluster_id":4930001140,"lat":16.945,"lng":74.425},"signals":[{"signal":"temperature","resolved_at":"2026-09-04T07:57:11Z","envelope":{"ok":true,"tool":"read_at","generation":{"namespace":"bs:cube:0852c73eef54","schema_fingerprint_ns":"0852c73eef54"},"result":{"signal":"temperature","unit":"celsius","admin_code":493,"cluster_id":4930001140,"value":{"temperature_c_idw":29.0425},"valid_time":{"kind":"valid_time","requested":"2026-09-04T07:57:11Z","served_window_start_utc":"2026-09-04T07:16:44+00:00","served_window_end_utc":"2026-09-04T08:16:44+00:00","natural_cadence_seconds":3600,"note":"the witness pin whose own natural window brackets `at`; never interpolated, never back-cast (R7)"},"support":{"kind":"imd_idw_station","support_m":null,"detail":{"temperature_c_n_stations":3},"note":"coarse witness support is disclosed; the value is not zoomed below it (§1.7)"},"witness":{"tier":"tier_o_v2","pin_seq":2180,"pin_sha256":"994ea062e174fdd516064b52f6d941d6f764372e7de4e1e01e69a0a357b880b4","provenance_kind":"upstream-reingest:imd-city-weather-hourly"}},"coverage":{"temporal_kind":"valid_time","observed_window_end_utc":"2026-09-04T08:16:44+00:00","support_kind":"imd_idw_station","scope":"mh36","note":"value is the witness observed in the pin whose natural window contains the requested instant; 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