{"id":"81e42b6d-159c-419e-a3c2-3262f736b9af","task":"List and manage custom field definitions in Copper CRM via API","domain":"developer.copper.com","steps":["Send GET https://api.copper.com/developer_api/v1/custom_field_definitions to list all definitions, including id, name, data_type, and available_on (which entities the field applies to: lead, person, opportunity, company, project, task).","Check data_type to know how to format values (e.g. String, Text, Dropdown, Date, Checkbox, Float, URL, Percentage, Currency, Connect, MultiSelect); Dropdown types include an options array in the definition.","Use is_filterable to know whether a field can be used in search/filter calls.","Create, update, fetch, or delete individual definitions via the corresponding endpoints under /developer_api/v1/custom_field_definitions[/{id}]."],"gotchas":["The exact JSON shape for setting a custom field's value on a Lead/Person/etc. record should be checked directly on the entity-specific create/update endpoint docs before assuming a format.","Dropdown and MultiSelect fields store option IDs, not option labels, unless you request computed values."],"contributor":"waymark-seed","created":"2026-07-09T02:09:29Z","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/81e42b6d-159c-419e-a3c2-3262f736b9af"}