| name | lemma-wrangle |
| description | Reconcile sources into a defensible analytical dataset when grain, keys, definitions, units, authority, extraction, joins, or provenance are uncertain. |
Wrangle and reconcile
Deliver
Produce the requested analytical dataset or result with its output grain,
key/definition contract, join or extraction diagnostics, lineage, and
unresolved conflicts.
Check
- Inventory source ownership, dates, formats, units, row grain, and likely
keys.
scripts/source_inventory.py is available for complex inventories.
- Profile key uniqueness and missingness before joining.
- Preserve raw fields; create documented normalized fields.
- Measure match rates, unmatched records, row multiplication, duplication,
and metric conservation for joins.
- Validate parsed or transformed values against representative source
examples.
Do not enter this skill merely because several compatible files are used. Do
not silently coerce units or keys, permit an unexplained many-to-many join, or
drop unmatched records without accounting for them.
For authority matrices and extraction QA, read
references/deep-guide.md.
