FamilySearch login session. "status" reports whether the dedicated Chrome is signed in and who the user is; "open_login" opens the sign-in page for the user.

People in the FamilySearch Family Tree (one shared, collaborative tree — edits are public and attributed; always give a changeMessage/reason). Actions: get (names, facts with ids, relatives, couple and child-parent relationships; sources=true adds source descriptions) · search (tree persons by name/dates/places/relatives; q* fields; matching is fuzzy by default — name wildcards "?" = one character, "" = any length, up to 4 per name, at least 3 literal letters, may lead or trail: bou, Tlts*) · ancestry / descendancy (generations) · changes (change history) · matches (record hints; records=true) · create (unconnected new person; connect with relationship.create) · update (add or edit facts/name/gender; a fact with id edits, without id adds) · delete_conclusion (remove a fact/name/gender by id) · delete (remove a person you created; needs reason). Dates and places on facts should carry formalDate and placeId (see the fact fields) or the tree flags them as non-standardized. Living people you create are private to your account (invisible to other users) until marked deceased.

Family Tree relationships. Actions: create_couple (person1 + person2, optional marriage facts) · create_child_parents (child + parent1/parent2, lineage types BiologicalParent/AdoptiveParent/StepParent/FosterParent/GuardianParent) · get_couple / get_child_parents (by relationship id, from person.get) · delete_couple / delete_child_parents (needs reason).

Sources on FamilySearch. A source description lives in the user's Source Box; attaching it to a person creates a source reference (with optional tags = the fact types it supports). Actions: list_person (a person's attached sources) · source_box (my source descriptions) · create (title, citation, optional about URL/ark) · get · delete_description · attach (personId + descriptionId + tags) · detach (personId + sourceReferenceId).

Notes on a Family Tree person. Actions: list · add (subject + text) · delete (noteId).

Memories (photos, documents). Actions: list_person · list_mine · get (metadata + file url) · download (file to outPath, or base64) · upload (local file → my memories; then attach) · attach (memoryId → personId) · delete (memoryId).

FamilySearch historical records. Actions: search (indexed records by name/dates/places/relatives/census role; collectionType narrows to a category; every field is fuzzy unless listed in exactFields; facets=true returns the site filter groups (collection, birth/marriage/death/residence place region and year range, sex) whose params can be passed back via extraParams; use offset/count to page; wildcards are rarely needed — "?" = one character, "" = any length, up to 4 per name, at least 3 literal letters, may lead or trail: Sm?th, bou, Tlts*) · get (full record by persona id or ark, with all persons on the record, their events, and the image ark) · download_image (the record's scanned image as JPEG to outPath or base64; maxWidth to scale) · collections (record collections). To cite a record on a tree person: source.create with about=the record ark, then source.attach.

Standardized places. Actions: search (name → place ids, jurisdictions, coordinates) · get (place description by id).

Escape hatch: any FamilySearch platform request with the session bearer token (path like "/platform/tree/persons/XXXX-XXX"; default Accept application/x-fs-v1+json). Set viaSite=true for www.familysearch.org /service/ endpoints that reject non-browser clients.