{"source":"https://api.gridrock.ai/mcp","tool":"read_at","scope":"mh36","archetype":"now","cell":{"admin_code":496,"cluster_id":4960000991,"lat":17.365,"lng":75.315},"signals":[{"signal":"temperature","resolved_at":"2026-08-11T16:43:37Z","envelope":{"ok":false,"tool":"read_at","generation":{"namespace":"bs:cube:0852c73eef54","schema_fingerprint_ns":"0852c73eef54"},"result":null,"coverage":null,"error":{"code":"after_observed_window","message":"`at` 2026-08-11T16:43:37Z is after the latest witnessed instant (2026-08-11T16:16:49+00:00); the engine will not back-cast a value it has not yet observed (R7)"}}},{"signal":"rainfall_imd","resolved_at":"2026-08-11T16:43:37Z","envelope":{"ok":false,"tool":"read_at","generation":{"namespace":"bs:cube:0852c73eef54","schema_fingerprint_ns":"0852c73eef54"},"result":null,"coverage":null,"error":{"code":"after_observed_window","message":"`at` 2026-08-11T16:43:37Z is after the latest witnessed instant (2026-08-11T16:16:49+00:00); the engine will not back-cast a value it has not yet observed (R7)"}}},{"signal":"rainfall","resolved_at":"2026-08-11T16:43:37Z","envelope":{"ok":false,"tool":"read_at","generation":{"namespace":"bs:cube:0852c73eef54","schema_fingerprint_ns":"0852c73eef54"},"result":null,"coverage":null,"error":{"code":"after_observed_window","message":"`at` 2026-08-11T16:43:37Z is after the latest witnessed instant (2026-08-08T18:29:59.999000+00:00); the engine will not back-cast a value it has not yet observed (R7)"}}},{"signal":"aqi","resolved_at":"2026-08-11T16:43:37Z","envelope":{"ok":true,"tool":"read_at","generation":{"namespace":"bs:cube:0852c73eef54","schema_fingerprint_ns":"0852c73eef54"},"result":{"signal":"aqi","unit":"cpcb_per_pollutant","admin_code":496,"cluster_id":4960000991,"value":{"aqi_pm2_5_idw":25.7625,"aqi_pm10_idw":20,"aqi_no2_idw":11.4768,"aqi_so2_idw":5.4165,"aqi_co_idw":19.4542,"aqi_ozone_idw":16.4685},"valid_time":{"kind":"valid_time","requested":"2026-08-11T16:43:37Z","served_window_start_utc":"2026-08-11T16:00:53+00:00","served_window_end_utc":"2026-08-11T17:00:53+00:00","natural_cadence_seconds":3600,"note":"the witness pin whose own natural window brackets `at`; never interpolated, never back-cast (R7)"},"support":{"kind":"cpcb_idw_district","support_m":null,"detail":{"aqi_pm2_5_n_stations":3,"aqi_pm10_n_stations":1,"aqi_no2_n_stations":2,"aqi_so2_n_stations":2,"aqi_co_n_stations":2,"aqi_ozone_n_stations":2},"note":"coarse witness support is disclosed; the value is not zoomed below it (§1.7)"},"witness":{"tier":"tier_m_v1","pin_seq":1019,"pin_sha256":"6557d6add9149c728e39553504a3fd3b16587de24236905f48abed22a9f4e75c","provenance_kind":"upstream-reingest:cpcb-aqi-hourly"}},"coverage":{"temporal_kind":"valid_time","observed_window_end_utc":"2026-08-11T17:00:53+00:00","support_kind":"cpcb_idw_district","scope":"mh36","note":"value is the witness observed in the pin whose natural window contains the requested instant; outside the observed window read_at refuses (R7) — it never interpolates and never replays a transaction-time cube."},"error":null}},{"signal":"weather_google","resolved_at":"2026-08-11T16:43:37Z","envelope":{"ok":false,"tool":"read_at","generation":{"namespace":"bs:cube:0852c73eef54","schema_fingerprint_ns":"0852c73eef54"},"result":null,"coverage":null,"error":{"code":"after_observed_window","message":"`at` 2026-08-11T16:43:37Z is after the latest witnessed instant (2026-08-11T16:06:48+00:00); the engine will not back-cast a value it has not yet observed (R7)"}}}]}