Get the CONCEPT CARD for one Field Registry field: what it means (curated description + extraction instruction), its synonyms and aliases, maturity, where it occurs (document/occurrence counts, first/last seen, document-type spread), its value distribution (top values with counts, distinct count, examples), schema usage, and identity links (superseded_by, absorbed concepts).
USE WHEN: you must decide whether a field is the right concept for a question, need example values or the value shape before writing a filter, or hold a field NAME from the user and need the live concept behind it.
NOT FOR: listing many fields (talonic_list_fields) or reading every value (talonic_field_values).
ARGS: exactly one of `field_id` or `name`. Names are resolved through canonical name → spelling fold → merge aliases → synonyms (then case-insensitive fallbacks) and followed to the live concept; the response says which arm matched. `include_history: true` appends the curation trail (merges, renames, maturity moves).
RETURNS: the card { id, canonical_name, maturity, data_type, definition, identity, occurrence, values, usage, links } plus `resolution` when a name was given and `history` when requested.