diff --git a/frontend/src/types/index.ts b/frontend/src/types/index.ts
index 36ac8eb..79d38ff 100644
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -386,7 +386,8 @@ export interface DagExecuteResult {
   execution_id?: number;
   status: string;
   message?: string;
-  results?: Array<{
+  success?: boolean;
+  results?: Record<string, number> | Array<{
     task_id: number;
     status: string;
     output?: string;
@@ -394,6 +395,36 @@ export interface DagExecuteResult {
   }>;
 }
 
+// ============ DAG Canvas ============
+
+export interface DagGraphNode {
+  id: number;
+  title: string;
+  status: TaskStatus;
+  priority: TaskPriority;
+  task_type: string;
+  worker_id?: number;
+  assignee_id?: number;
+  requires_review: boolean;
+}
+
+export interface DagGraphEdge {
+  id: string;
+  source: number;
+  target: number;
+}
+
+export interface DagGraph {
+  project_id: number;
+  nodes: DagGraphNode[];
+  edges: DagGraphEdge[];
+}
+
+export interface DependencyPayload {
+  task_id: number;
+  depends_on_id: number;
+}
+
 // ============ Generic ============
 
 export interface ApiError {