{"source":"https://api.gridrock.ai/mcp","tool":"read_at","scope":"mh36","archetype":"now","cell":{"admin_code":473,"cluster_id":4730004009,"lat":20.055,"lng":79.745},"signals":[{"signal":"temperature","resolved_at":"2026-08-29T12:07:25Z","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` 2026-08-29T12:07:25Z is after the latest witnessed instant (2026-08-29T11:16:40+00:00); the engine will not back-cast a value it has not yet observed (R7)"}}},{"signal":"rainfall_imd","resolved_at":"2026-08-29T12:07:25Z","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` 2026-08-29T12:07:25Z is after the latest witnessed instant (2026-08-29T11:16:40+00:00); the engine will not back-cast a value it has not yet observed (R7)"}}},{"signal":"rainfall","resolved_at":"2026-08-29T12:07:25Z","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` 2026-08-29T12:07:25Z is after the latest witnessed instant (2026-08-28T20:59:59.999000+00:00); the engine will not back-cast a value it has not yet observed (R7)"}}},{"signal":"aqi","resolved_at":"2026-08-29T12:07:25Z","envelope":{"ok":true,"tool":"read_at","generation":{"namespace":"bs:cube:0852c73eef54","schema_fingerprint_ns":"0852c73eef54"},"result":{"signal":"aqi","unit":"cpcb_per_pollutant","admin_code":473,"cluster_id":4730004009,"value":{"aqi_pm2_5_idw":null,"aqi_pm10_idw":73,"aqi_no2_idw":23,"aqi_so2_idw":7.936,"aqi_co_idw":25,"aqi_ozone_idw":null},"valid_time":{"kind":"valid_time","requested":"2026-08-29T12:07:25Z","served_window_start_utc":"2026-08-29T12:00:53+00:00","served_window_end_utc":"2026-08-29T13:00:53+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":0,"aqi_pm10_n_stations":1,"aqi_no2_n_stations":1,"aqi_so2_n_stations":2,"aqi_co_n_stations":1,"aqi_ozone_n_stations":0},"note":"coarse witness support is disclosed; the value is not zoomed below it (§1.7)"},"witness":{"tier":"tier_m_v1","pin_seq":1331,"pin_sha256":"48da2118729bdc8130937278c0f9b012bf9fe76332777661befb89d843d97447","provenance_kind":"upstream-reingest:cpcb-aqi-hourly"}},"coverage":{"temporal_kind":"valid_time","observed_window_end_utc":"2026-08-29T13:00:53+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":"2026-08-29T12:07:25Z","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` 2026-08-29T12:07:25Z is after the latest witnessed instant (2026-08-29T12:06:49+00:00); the engine will not back-cast a value it has not yet observed (R7)"}}}]}