diff --git a/README.zh-CN.md b/README.zh-CN.md
index e8519d5..47edee8 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -49,7 +49,7 @@ python3 -m unittest discover -s python/tests -v
 推荐流程：
 
 1. 第一次运行保持 `apply=false`，只看 preview。
-2. 确认 `repository`、`environment`、`strategy_profile`、`service_name`、`execution_mode` 和插件挂载正确。
+2. 确认 `repository`、`environment`、`strategy_profile`、`service_name`、`execution_mode`，以及由 `strategy_profile` 派生的 `scheduler` / 插件挂载正确。
 3. 再运行 `apply=true`，并填写 `confirm_apply=APPLY`，写入目标仓库变量。
 4. 如果要让平台仓同步 Cloud Run 环境，额外设置 `trigger_platform_sync=true`，并填写 `confirm_apply=APPLY_AND_SYNC`。
 
diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
index ea240c9..c4c5b1f 100644
--- a/docs/ARCHITECTURE.md
+++ b/docs/ARCHITECTURE.md
@@ -4,6 +4,8 @@
 
 QuantRuntimeSettings is a **config-driven** runtime settings package that serves as the central control plane for QuantStrategyLab deployments. It defines versioned strategy-to-platform assignments and hosts a Cloudflare Workers-based strategy switch console.
 
+The generated `RUNTIME_TARGET_JSON` payload is the canonical desired-state contract for a switch. `scheduler` and plugin mount outputs are derived from `strategy_profile`, while `execution_mode` is part of the target and validated against strategy-profile policy.
+
 The repository has a **three-tier architecture** built around a single source of truth:
 
 ```
diff --git a/python/tests/test_runtime_settings.py b/python/tests/test_runtime_settings.py
index 024768a..7d4a056 100644
--- a/python/tests/test_runtime_settings.py
+++ b/python/tests/test_runtime_settings.py
@@ -710,6 +710,7 @@ def test_build_switch_target_defaults_longbridge_sg_tqqq(self):
             "tqqq_growth_income/plugins/market_regime_control/latest_signal.json",
         )
         self.assertEqual(plugin_payload["strategy_plugins"][0]["expected_schema_version"], "market_regime_control.v1")
+        self.assertEqual(runtime_settings.validate_target(target), [])
 
     def test_build_switch_target_uses_fork_repository_overrides(self):
         parser = build_runtime_switch.build_parser()
@@ -1405,6 +1406,24 @@ def test_runtime_target_scheduler_rejects_invalid_cron_shape(self):
             runtime_settings.validate_target(target),
         )
 
+    def test_runtime_target_scheduler_rejects_extra_fields(self):
+        _, target = self.load_target("examples/targets/longbridge/hk_combo.example.json")
+        target["runtime_target"]["scheduler"]["offset_minutes"] = 10
+
+        self.assertIn(
+            "runtime_target.scheduler.offset_minutes is unsupported",
+            runtime_settings.validate_target(target),
+        )
+
+    def test_runtime_target_scheduler_requires_timezone(self):
+        _, target = self.load_target("examples/targets/longbridge/hk_combo.example.json")
+        target["runtime_target"]["scheduler"].pop("timezone")
+
+        self.assertIn(
+            "runtime_target.scheduler.timezone must be a non-empty string",
+            runtime_settings.validate_target(target),
+        )
+
     def test_build_switch_target_rejects_secret_extra_variable(self):
         parser = build_runtime_switch.build_parser()
         args = parser.parse_args(
diff --git a/schemas/runtime-target.schema.json b/schemas/runtime-target.schema.json
index d31d7c9..cea415f 100644
--- a/schemas/runtime-target.schema.json
+++ b/schemas/runtime-target.schema.json
@@ -77,6 +77,24 @@
           "type": "string",
           "enum": ["live", "paper", "dry_run"]
         },
+        "scheduler": {
+          "type": "object",
+          "additionalProperties": false,
+          "properties": {
+            "timezone": {
+              "type": "string"
+            },
+            "main_time": {
+              "type": "string"
+            },
+            "probe_time": {
+              "type": "string"
+            },
+            "precheck_time": {
+              "type": "string"
+            }
+          }
+        },
         "execution_windows": {
           "type": "object",
           "additionalProperties": false,