Find-Cohort-Gap Skill

Output directory: user-specified (default: current working directory).

Phase 0: Cohort Intake

The cohort does not have to be one this skill has heard of. Route on what the user actually has.

The user has…	Do this
A named public cohort (NHIS, UK Biobank, KNHANES, …)	Fill the profile from published documentation. Cite the source for every field.
A codebook / data dictionary / CSV export of their own registry or EMR extract	Run the input adapter below. This is the common case — an institutional registry or single-centre export that no public documentation describes.
A review, guideline, or preprint defining the clinical domain	Attach it as domain context (`--context`), as a file or a URL.