diff --git a/src/builtin_actions.py b/src/builtin_actions.py
index bf4ddd950..ce6d540c0 100644
--- a/src/builtin_actions.py
+++ b/src/builtin_actions.py
@@ -2175,6 +2175,8 @@ async def action_cookbook_serve(
             )
             if existing is None:
                 display_name = repo_id.split("/")[-1] if "/" in repo_id else repo_id
+                ssh_port = str(srv.get("port") or cfg.get("ssh_port") or "")
+                platform = str(srv.get("platform") or cfg.get("platform") or "linux")
                 placeholder = (
                     f"Launched by scheduled task {task_name!r} — waiting for tmux output…\n"
                     f"  session: {sid}\n"
@@ -2192,8 +2194,8 @@ async def action_cookbook_serve(
                     "ts": int(_time.time() * 1000),
                     "payload": {"repo_id": repo_id, "remote_host": host or "", "_cmd": cmd},
                     "remoteHost": host or "",
-                    "sshPort": "",
-                    "platform": "linux",
+                    "sshPort": ssh_port or "",
+                    "platform": platform or "linux",
                     "_serveReady": False,
                     "_endpointAdded": False,
                 }
diff --git a/tests/test_builtin_actions_cookbook_serve_state.py b/tests/test_builtin_actions_cookbook_serve_state.py
new file mode 100644
index 000000000..62f5641c8
--- /dev/null
+++ b/tests/test_builtin_actions_cookbook_serve_state.py
@@ -0,0 +1,72 @@
+import json
+
+import httpx
+import pytest
+
+from src import builtin_actions
+
+
+class _FakeServeResponse:
+    content = b"{}"
+
+    def json(self):
+        return {"ok": True, "session_id": "tmux-123"}
+
+
+async def _fake_post(self, *_args, **_kwargs):
+    return _FakeServeResponse()
+
+
+async def _run_scheduled_serve(tmp_path, monkeypatch, server):
+    state_path = tmp_path / "cookbook_state.json"
+    state_path.write_text(
+        json.dumps({"env": {"servers": [server]}}),
+        encoding="utf-8",
+    )
+    monkeypatch.setattr(builtin_actions, "COOKBOOK_STATE_FILE", str(state_path))
+    monkeypatch.setattr(httpx.AsyncClient, "post", _fake_post)
+
+    message, ok = await builtin_actions.action_cookbook_serve(
+        owner="alice",
+        task_name="test-serve",
+        command=json.dumps({
+            "repo_id": "org/model",
+            "cmd": "llama-server --port 8080",
+            "host": "gpu-box",
+            "end_after_min": 30,
+        }),
+    )
+
+    assert ok is True, message
+    tasks = json.loads(state_path.read_text(encoding="utf-8"))["tasks"]
+    assert len(tasks) == 1
+    return tasks[0]
+
+
+@pytest.mark.asyncio
+async def test_scheduled_serve_preserves_server_ssh_port_and_platform(tmp_path, monkeypatch):
+    task = await _run_scheduled_serve(
+        tmp_path,
+        monkeypatch,
+        {"name": "gpu-box", "host": "gpu-box", "port": "2222", "platform": "windows"},
+    )
+
+    assert task["sshPort"] == "2222"
+    assert task["platform"] == "windows"
+    assert task["remoteHost"] == "gpu-box"
+    assert task["payload"]["_cmd"] == "llama-server --port 8080"
+
+
+@pytest.mark.asyncio
+async def test_scheduled_serve_uses_task_state_fallbacks_without_server_metadata(
+    tmp_path,
+    monkeypatch,
+):
+    task = await _run_scheduled_serve(
+        tmp_path,
+        monkeypatch,
+        {"name": "gpu-box", "host": "gpu-box"},
+    )
+
+    assert task["sshPort"] == ""
+    assert task["platform"] == "linux"