Slug Available

Check whether a slug is available for the current workspace. Admin only.

Returns { available: true } if the slug is valid, not reserved, and not already claimed by another workspace. When unavailable, reason indicates why: invalid (format/length), reserved (blocked word), or taken (already in use globally). The workspace’s own current slug is self-excluded, so an admin can safely check their existing slug without receiving taken.

This is an advisory point-in-time check — a concurrent POST /workspaces or PATCH /workspaces/{id} from another session can claim the slug between this response and the caller’s write. Always handle 409 WORKSPACE_SLUG_TAKEN on create_workspace and update_workspace.

Requires the X-Workspace-Id header (the workspace being renamed) and admin role in that workspace. Missing/invalid header returns 400; not a member returns 404; not admin returns 403.