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Activity, energy, technology, population and natural conditions. WorldPop and company-basic-information ZIP processing support run-tool. ERA5, CAMS EAC4 and forecasts offer website/API guidance and verified small examples, without runner adapters. Yearbooks, energy and enterprise disclosure need adaptation.
Choose observations, reanalysis or forecasts by the question, verify variables/time/grid/units, then follow the relevant skill. ERA5/EAC4/forecasts have one primary home here, referenced by 03/04. Station observations remain in stage 03.
Follow the four-step workflow: confirm scope, choose methods, check prerequisites and hand off validated artifacts. See the stage methods and shared methods.
Documentation maintenance reads descriptions and interfaces only, not original data. Actual execution depends on tool manifests; directories and SKILL.md do not register tools.
Follow the asset contract: share data by stage, actual name and version; group results by project and run, referencing the same data across stages. Registration uses compute/check, human review and a fresh data version.