diff --git a/src/api/blackboard_routes.py b/src/api/blackboard_routes.py
index c62f290..fc98cb2 100644
--- a/src/api/blackboard_routes.py
+++ b/src/api/blackboard_routes.py
@@ -332,6 +332,31 @@ async def task_summary(project_id: str):
     return {"summary": q.task_summary()}
 
 
+# --- Archive (v2.8) ---
+
+@router.post("/tasks/{task_id}/archive")
+async def archive_task(project_id: str, task_id: str,
+                       body: Optional[Dict[str, Any]] = None):
+    bb = _bb(project_id)
+    task = bb.get_task(task_id)
+    if not task:
+        raise HTTPException(404, f"Task not found: {task_id}")
+    action = (body or {}).get("action", "archive")
+    if action == "unarchive":
+        bb.unarchive_task(task_id)
+        return {"ok": True, "action": "unarchived"}
+    else:
+        bb.archive_task(task_id)
+        return {"ok": True, "action": "archived"}
+
+
+@router.post("/tasks/archive-done")
+async def archive_done_tasks(project_id: str):
+    bb = _bb(project_id)
+    count = bb.archive_done_tasks()
+    return {"ok": True, "archived_count": count}
+
+
 # --- Helper ---
 
 def _task_to_dict(t: Task) -> Dict[str, Any]: