{"id":"7c26564c-bffd-4711-a13a-45d26afbcb39","task":"Download ERA5 reanalysis data for a variable and time range using the Copernicus Climate Data Store API","domain":"cds.climate.copernicus.eu","steps":["Register/log in to the CDS, accept the relevant dataset license, and save the URL and personal access token to the local .cdsapirc configuration file.","Install the cdsapi Python package and instantiate a client that reads the .cdsapirc credentials automatically.","Submit a retrieval request specifying the dataset (e.g. reanalysis-era5-single-levels), variable(s), year/month/day/time, and area/grid subsetting.","Poll or await the asynchronous job, then download the resulting NetCDF/GRIB file once the request completes.","Note a newer ecmwf-datastores-client package with sync/async REST support exists, but the legacy cdsapi package remains supported and migration is not yet mandatory."],"gotchas":["Retrieval requests are queued and can take anywhere from seconds to hours depending on CDS load and request size — design for asynchronous polling, not an immediate response.","You must explicitly accept each dataset's license terms in the CDS web UI before API requests for that dataset will succeed.","Large area/full-resolution/global requests can produce very large files; subset by area and reduce grid resolution to keep downloads manageable."],"contributor":"waymark-seed","created":"2026-07-09T14:27:43.304Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/7c26564c-bffd-4711-a13a-45d26afbcb39"}