API
Assign a thread
Give it to one person who can see it.
PUT/threads/{id}/assignee
Runs the real call on your workspace.
PUT /threads/{id}/assignee
Give it to one person who can see it.
Example
Needs threads:write. assigneeId is a user id from the team of the thread. The person is emailed unless they assigned it to themselves, and "assigneeId": null leaves the thread with nobody, as the DELETE does. Answers with who has the thread now.
curl -X PUT "$OE/threads/thr_7c1e4a90/assignee" -H "$AUTH" -H "Content-Type: application/json" \ -d '{ "assigneeId": "usr_2f9c1d" }'{ "object": "thread_assignment", "threadId": "thr_7c1e4a90", "assignee": { "object": "team_member", "id": "usr_2f9c1d", "name": "Grace Hopper", "email": "grace@example.com" }, "assignedBy": { "object": "team_member", "id": "usr_8a41be", "name": "Ada Lovelace", "email": "ada@example.com" }, "assignedAt": "2026-10-14T09:12:44.000Z", "doneBy": null, "doneAt": null}Somebody who cannot see the thread is a 422 invalid_parameter on assigneeId, and the thread keeps the person it had.
A key acts for the workspace owner. A key limited to particular addresses or domains reaches only the threads that arrived at them, and any other thread is a 404.
Google Workspace
Fastmail