diff --git a/apps/rlark/docs/examples/agent-rbac.yaml b/apps/rlark/docs/examples/agent-rbac.yaml
index d31c726..b79fe9b 100644
--- a/apps/rlark/docs/examples/agent-rbac.yaml
+++ b/apps/rlark/docs/examples/agent-rbac.yaml
@@ -1,5 +1,5 @@
 # Agent RBAC
-# Applied by quickstart.sh to each kind data plane cluster.
+# Applied by quickstart.sh and quickstart-dp.sh to each kind data plane cluster.
 apiVersion: v1
 kind: ServiceAccount
 metadata:
@@ -14,6 +14,10 @@ rules:
 - apiGroups: [""]
   resources: ["nodes", "pods", "pods/log", "services", "configmaps", "secrets", "namespaces", "persistentvolumeclaims", "events"]
   verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
+# WebTerminal opens a container session with POST pods/exec.
+- apiGroups: [""]
+  resources: ["pods/exec"]
+  verbs: ["create"]
 - apiGroups: ["apps"]
   resources: ["deployments", "replicasets", "statefulsets", "daemonsets"]
   verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
@@ -38,4 +42,4 @@ roleRef:
 subjects:
 - kind: ServiceAccount
   name: rlark-agent
-  namespace: rlark-system
\ No newline at end of file
+  namespace: rlark-system
diff --git a/apps/rlark/docs/user-guide/jobs.md b/apps/rlark/docs/user-guide/jobs.md
index f82caf3..1aa90d3 100644
--- a/apps/rlark/docs/user-guide/jobs.md
+++ b/apps/rlark/docs/user-guide/jobs.md
@@ -147,6 +147,18 @@ You can open an interactive terminal directly into the main container of any run
 
 From the Worker list, click **Terminal** on any running Worker. This opens `/bin/bash` by default in the Worker's main container. The browser establishes a WebSocket to Gateway, which proxies the session through Server to Agent and then execs into the container. The user does not need to log in with SSH.
 
+### Troubleshooting Permission Errors
+
+If the terminal reports `cannot create resource "pods/exec"`, the data-plane Agent's ServiceAccount lacks permission to execute commands in containers. Ask an administrator to grant the Agent `create` access to `pods/exec` in the target data-plane cluster. For quickstart deployments, reapply the updated RBAC manifest from the repository root:
+
+```bash
+kubectl --kubeconfig <data-plane-kubeconfig> apply -f apps/rlark/docs/examples/agent-rbac.yaml
+kubectl --kubeconfig <data-plane-kubeconfig> auth can-i create pods --subresource=exec \
+  -n rlark-system --as=system:serviceaccount:rlark-system:rlark-agent
+```
+
+Once the check returns `yes`, reopen the terminal; no Agent or Worker restart is required. Apply these permissions to the data-plane Kubernetes cluster, not the control-plane kcp instance.
+
 ### Diagnostic Commands
 
 Once inside the terminal, you can run diagnostic commands to inspect the container environment:
diff --git a/apps/rlark/docs/zh/user-guide/jobs.md b/apps/rlark/docs/zh/user-guide/jobs.md
index 8b705f3..d35407a 100644
--- a/apps/rlark/docs/zh/user-guide/jobs.md
+++ b/apps/rlark/docs/zh/user-guide/jobs.md
@@ -143,6 +143,18 @@ RLark 支持以下任务类型，每种类型预配置了适合该工作负载
 
 在 Worker 列表中点击任意运行中 Worker 的**终端**操作，默认会在其主容器中打开 `/bin/bash`。浏览器通过 WebSocket 连接 Gateway，再由 Gateway 经 Server 代理到 Agent，最终 exec 进入容器；用户无需进行 SSH 登录。
 
+### 权限错误排查
+
+如果终端提示 `cannot create resource "pods/exec"`，说明数据面 Agent 的 ServiceAccount 缺少执行容器命令的权限。请管理员在目标数据面集群为 Agent 授予 `pods/exec` 的 `create` 权限。使用快速开始部署的集群，可以在仓库根目录重新应用更新后的 RBAC 清单：
+
+```bash
+kubectl --kubeconfig <数据面-kubeconfig> apply -f apps/rlark/docs/examples/agent-rbac.yaml
+kubectl --kubeconfig <数据面-kubeconfig> auth can-i create pods --subresource=exec \
+  -n rlark-system --as=system:serviceaccount:rlark-system:rlark-agent
+```
+
+确认返回 `yes` 后重新打开终端，无需重启 Agent 或 Worker。该权限配置在数据面 Kubernetes 集群中，不是在控制面的 kcp 中。
+
 ### 诊断命令
 
 进入终端后可运行诊断命令检查容器环境：
diff --git a/apps/rlark/pkg/agent/rbac_test.go b/apps/rlark/pkg/agent/rbac_test.go
new file mode 100644
index 0000000..23e3db0
--- /dev/null
+++ b/apps/rlark/pkg/agent/rbac_test.go
@@ -0,0 +1,77 @@
+package agent
+
+import (
+	"io"
+	"os"
+	"slices"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	corev1 "k8s.io/api/core/v1"
+	rbacv1 "k8s.io/api/rbac/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/util/yaml"
+	"k8s.io/client-go/kubernetes/scheme"
+)
+
+func TestQuickstartAgentTerminalRBAC(t *testing.T) {
+	manifest, err := os.Open("../../docs/examples/agent-rbac.yaml")
+	require.NoError(t, err)
+	defer func() { require.NoError(t, manifest.Close()) }()
+
+	var account *corev1.ServiceAccount
+	var role *rbacv1.ClusterRole
+	var binding *rbacv1.ClusterRoleBinding
+	decoder := yaml.NewYAMLOrJSONDecoder(manifest, 4096)
+	for {
+		var raw runtime.RawExtension
+		err := decoder.Decode(&raw)
+		if err == io.EOF {
+			break
+		}
+		require.NoError(t, err)
+		obj, _, err := scheme.Codecs.UniversalDeserializer().Decode(raw.Raw, nil, nil)
+		require.NoError(t, err)
+		switch obj := obj.(type) {
+		case *corev1.ServiceAccount:
+			account = obj
+		case *rbacv1.ClusterRole:
+			role = obj
+		case *rbacv1.ClusterRoleBinding:
+			binding = obj
+		}
+	}
+	require.NotNil(t, account)
+	require.NotNil(t, role)
+	require.NotNil(t, binding)
+	require.Equal(t, "rlark-agent", account.Name)
+	require.Equal(t, "rlark-system", account.Namespace)
+	require.Equal(t, rbacv1.RoleRef{APIGroup: rbacv1.GroupName, Kind: "ClusterRole", Name: role.Name}, binding.RoleRef)
+	require.Contains(t, binding.Subjects, rbacv1.Subject{Kind: "ServiceAccount", Name: account.Name, Namespace: account.Namespace})
+
+	// handleTerminal uses POST pods/exec. Ordinary Pod access does not grant
+	// access to this subresource, and exec does not need mutation verbs other
+	// than create.
+	for _, tt := range []struct {
+		verb string
+		want bool
+	}{
+		{"create", true},
+		{"delete", false},
+		{"patch", false},
+		{"update", false},
+	} {
+		t.Run(tt.verb, func(t *testing.T) {
+			allowed := false
+			for _, rule := range role.Rules {
+				if len(rule.ResourceNames) == 0 &&
+					(slices.Contains(rule.APIGroups, "") || slices.Contains(rule.APIGroups, "*")) &&
+					(slices.Contains(rule.Resources, "pods/exec") || slices.Contains(rule.Resources, "*")) &&
+					(slices.Contains(rule.Verbs, tt.verb) || slices.Contains(rule.Verbs, "*")) {
+					allowed = true
+				}
+			}
+			require.Equal(t, tt.want, allowed)
+		})
+	}
+}