diff --git a/app/api/tasks/runs/route.ts b/app/api/tasks/runs/route.ts
index b9c876022..132811b0a 100644
--- a/app/api/tasks/runs/route.ts
+++ b/app/api/tasks/runs/route.ts
@@ -17,14 +17,16 @@ export async function OPTIONS() {
 /**
  * GET /api/tasks/runs
  *
- * Retrieves the status of a Trigger.dev task run.
- * Returns one of three possible statuses:
- * - pending: Task is still running
- * - complete: Task completed successfully with data
- * - failed: Task failed with error message
+ * Retrieves task runs from Trigger.dev.
+ * Supports two modes:
+ * - Retrieve mode: when `runId` is provided, returns a single run in `runs: [run]`
+ * - List mode: when `runId` is omitted, returns recent runs for the authorized account in `runs: []`
  *
  * Query parameters:
- * - runId (required): The unique identifier of the task run
+ * - runId (optional): The unique identifier of the task run
+ * - account_id (optional): Scope to this account when allowed: admin, org-authorized member, or
+ *   personal key with account_id equal to the authenticated account (self-access).
+ * - limit (optional): Number of runs to return in list mode (default 20, max 100)
  *
  * @param request - The request object containing query parameters.
  * @returns A NextResponse with task run status.
diff --git a/lib/tasks/__tests__/getTaskRunHandler.test.ts b/lib/tasks/__tests__/getTaskRunHandler.test.ts
index 9f17fffce..ca84ce235 100644
--- a/lib/tasks/__tests__/getTaskRunHandler.test.ts
+++ b/lib/tasks/__tests__/getTaskRunHandler.test.ts
@@ -61,7 +61,11 @@ describe("getTaskRunHandler", () => {
 
   describe("retrieve mode", () => {
     it("wraps a single run in { status, runs[] }", async () => {
-      vi.mocked(validateGetTaskRunQuery).mockResolvedValue({ mode: "retrieve", runId: "run_123" });
+      vi.mocked(validateGetTaskRunQuery).mockResolvedValue({
+        mode: "retrieve",
+        runId: "run_123",
+        accountId: "acc_123",
+      });
       vi.mocked(retrieveTaskRun).mockResolvedValue(mockRun);
 
       const response = await getTaskRunHandler(createMockRequest());
@@ -74,7 +78,11 @@ describe("getTaskRunHandler", () => {
     });
 
     it("returns 404 when run is not found", async () => {
-      vi.mocked(validateGetTaskRunQuery).mockResolvedValue({ mode: "retrieve", runId: "run_x" });
+      vi.mocked(validateGetTaskRunQuery).mockResolvedValue({
+        mode: "retrieve",
+        runId: "run_x",
+        accountId: "acc_123",
+      });
       vi.mocked(retrieveTaskRun).mockResolvedValue(null);
 
       const response = await getTaskRunHandler(createMockRequest());
@@ -82,7 +90,11 @@ describe("getTaskRunHandler", () => {
     });
 
     it("returns 500 when retrieveTaskRun throws", async () => {
-      vi.mocked(validateGetTaskRunQuery).mockResolvedValue({ mode: "retrieve", runId: "run_123" });
+      vi.mocked(validateGetTaskRunQuery).mockResolvedValue({
+        mode: "retrieve",
+        runId: "run_123",
+        accountId: "acc_123",
+      });
       vi.mocked(retrieveTaskRun).mockRejectedValue(new Error("API error"));
 
       const response = await getTaskRunHandler(createMockRequest());
@@ -90,6 +102,21 @@ describe("getTaskRunHandler", () => {
       const json = await response.json();
       expect(json.error).toBe("API error");
     });
+
+    it("returns 404 when run does not belong to the authorized account (no enumeration)", async () => {
+      vi.mocked(validateGetTaskRunQuery).mockResolvedValue({
+        mode: "retrieve",
+        runId: "run_123",
+        accountId: "acc_999",
+      });
+      vi.mocked(retrieveTaskRun).mockResolvedValue(mockRun);
+
+      const response = await getTaskRunHandler(createMockRequest());
+      const json = await response.json();
+
+      expect(response.status).toBe(404);
+      expect(json.error).toBe("Task run not found");
+    });
   });
 
   describe("list mode", () => {
diff --git a/lib/tasks/__tests__/validateGetTaskRunQuery.test.ts b/lib/tasks/__tests__/validateGetTaskRunQuery.test.ts
index f7126175d..830a10be5 100644
--- a/lib/tasks/__tests__/validateGetTaskRunQuery.test.ts
+++ b/lib/tasks/__tests__/validateGetTaskRunQuery.test.ts
@@ -100,7 +100,7 @@ describe("validateGetTaskRunQuery", () => {
       const result = await validateGetTaskRunQuery(request);
 
       expect(result).not.toBeInstanceOf(NextResponse);
-      expect(result).toEqual({ mode: "retrieve", runId: "run_abc123" });
+      expect(result).toEqual({ mode: "retrieve", runId: "run_abc123", accountId: "acc_123" });
     });
 
     it("trims whitespace from runId", async () => {
@@ -111,7 +111,7 @@ describe("validateGetTaskRunQuery", () => {
       const result = await validateGetTaskRunQuery(request);
 
       expect(result).not.toBeInstanceOf(NextResponse);
-      expect(result).toEqual({ mode: "retrieve", runId: "run_abc123" });
+      expect(result).toEqual({ mode: "retrieve", runId: "run_abc123", accountId: "acc_123" });
     });
 
     it("returns list mode with custom limit", async () => {
@@ -210,5 +210,24 @@ describe("validateGetTaskRunQuery", () => {
       expect(result).not.toBeInstanceOf(NextResponse);
       expect(result).toEqual({ mode: "list", accountId: "acc_123", limit: 20 });
     });
+
+    it("applies account_id override in retrieve mode for admin", async () => {
+      vi.mocked(validateAuthContext).mockResolvedValue({
+        accountId: "admin_acc",
+        orgId: null,
+        authToken: "bearer-token",
+      });
+      vi.mocked(checkIsAdmin).mockResolvedValue(true);
+
+      const request = createMockRequest(
+        "http://localhost:3000/api/tasks/runs?runId=run_123&account_id=other_acc",
+      );
+
+      const result = await validateGetTaskRunQuery(request);
+
+      expect(result).not.toBeInstanceOf(NextResponse);
+      expect(result).toEqual({ mode: "retrieve", runId: "run_123", accountId: "other_acc" });
+      expect(validateAccountIdOverride).not.toHaveBeenCalled();
+    });
   });
 });
diff --git a/lib/tasks/getTaskRunHandler.ts b/lib/tasks/getTaskRunHandler.ts
index f988c6b6a..8cd23db05 100644
--- a/lib/tasks/getTaskRunHandler.ts
+++ b/lib/tasks/getTaskRunHandler.ts
@@ -41,6 +41,17 @@ export async function getTaskRunHandler(request: NextRequest): Promise<NextRespo
       );
     }
 
+    const tags = Array.isArray((result as { tags?: unknown }).tags)
+      ? ((result as { tags?: unknown[] }).tags ?? [])
+      : [];
+    const hasAccountAccess = tags.includes(`account:${validatedQuery.accountId}`);
+    if (!hasAccountAccess) {
+      return NextResponse.json(
+        { status: "error", error: "Task run not found" },
+        { status: 404, headers: getCorsHeaders() },
+      );
+    }
+
     return NextResponse.json(
       { status: "success", runs: [result] },
       { status: 200, headers: getCorsHeaders() },
diff --git a/lib/tasks/validateGetTaskRunQuery.ts b/lib/tasks/validateGetTaskRunQuery.ts
index b4bdf1694..2cc8568a8 100644
--- a/lib/tasks/validateGetTaskRunQuery.ts
+++ b/lib/tasks/validateGetTaskRunQuery.ts
@@ -20,7 +20,7 @@ const getTaskRunQuerySchema = z.object({
   limit: z.coerce.number().int().min(1).max(100).default(20),
 });
 
-export type ValidatedRetrieveQuery = { mode: "retrieve"; runId: string };
+export type ValidatedRetrieveQuery = { mode: "retrieve"; runId: string; accountId: string };
 export type ValidatedListQuery = { mode: "list"; accountId: string; limit: number };
 export type GetTaskRunQuery = ValidatedRetrieveQuery | ValidatedListQuery;
 
@@ -28,7 +28,7 @@ export type GetTaskRunQuery = ValidatedRetrieveQuery | ValidatedListQuery;
  * Validates auth context and query parameters for GET /api/tasks/runs.
  *
  * Returns a discriminated union:
- * - `{ mode: "retrieve", runId }` when runId is provided
+ * - `{ mode: "retrieve", runId, accountId }` when runId is provided
  * - `{ mode: "list", accountId, limit }` when runId is omitted
  *
  * When account_id is provided:
@@ -68,10 +68,6 @@ export async function validateGetTaskRunQuery(
     );
   }
 
-  if (result.data.runId) {
-    return { mode: "retrieve", runId: result.data.runId };
-  }
-
   // Resolve the target account ID
   let targetAccountId = authResult.accountId;
 
@@ -95,5 +91,9 @@ export async function validateGetTaskRunQuery(
     }
   }
 
+  if (result.data.runId) {
+    return { mode: "retrieve", runId: result.data.runId, accountId: targetAccountId };
+  }
+
   return { mode: "list", accountId: targetAccountId, limit: result.data.limit };
 }