diff --git a/CHANGELOG.md b/CHANGELOG.md
index 66a11bce406..b677bfb514d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -70,6 +70,7 @@ Docs: https://docs.openclaw.ai
 ### Fixes
 
 - Gateway/OpenAI-compatible: send the assistant role SSE chunk as soon as streaming chat-completion headers are accepted, so cold agent setup cannot leave `/v1/chat/completions` clients with a bodyless 200 response until their idle timeout fires.
+- Agents/media: avoid direct generated-media completion fallback while the announce-agent run is still pending, so async video and music completions do not duplicate raw media messages. (#77754)
 - TUI/sessions: bound the session picker to recent rows and use exact lookup-style refreshes for the active session, so dusty stores no longer make TUI hydrate weeks-old transcripts before becoming responsive. Thanks @vincentkoc.
 - Doctor/gateway: report recent supervisor restart handoffs in `openclaw doctor --deep`, using the installed service environment when available so service-managed clean exits are visible in guided diagnostics. Thanks @shakkernerd.
 - Gateway/status: show recent supervisor restart handoffs in `openclaw gateway status --deep`, including JSON details, so clean service-managed restarts are reported as restart handoffs instead of opaque stopped-service diagnostics. Thanks @shakkernerd.
diff --git a/src/agents/subagent-announce-delivery.ts b/src/agents/subagent-announce-delivery.ts
index f44fe6b5668..a4ea8f7d721 100644
--- a/src/agents/subagent-announce-delivery.ts
+++ b/src/agents/subagent-announce-delivery.ts
@@ -6,6 +6,7 @@ import { normalizeAccountId } from "../routing/session-key.js";
 import { defaultRuntime } from "../runtime.js";
 import { deriveSessionChatTypeFromKey } from "../sessions/session-chat-type-shared.js";
 import { isCronSessionKey } from "../sessions/session-key-utils.js";
+import { isNonTerminalAgentRunStatus } from "../shared/agent-run-status.js";
 import { normalizeOptionalLowercaseString } from "../shared/string-coerce.js";
 import {
   mergeDeliveryContext,
@@ -694,7 +695,7 @@ function isGatewayAgentRunPending(response: unknown): boolean {
     return false;
   }
   const status = (response as { status?: unknown }).status;
-  return status === "accepted" || status === "in_flight" || status === "started";
+  return isNonTerminalAgentRunStatus(status);
 }
 
 function inferCompletionChatType(params: {
diff --git a/src/gateway/server-methods/agent-wait-dedupe.ts b/src/gateway/server-methods/agent-wait-dedupe.ts
index 83ae4f842b9..1f7fe959132 100644
--- a/src/gateway/server-methods/agent-wait-dedupe.ts
+++ b/src/gateway/server-methods/agent-wait-dedupe.ts
@@ -1,3 +1,4 @@
+import { isNonTerminalAgentRunStatus } from "../../shared/agent-run-status.js";
 import { setSafeTimeout } from "../../utils/timer-delay.js";
 import type { DedupeEntry } from "../server-shared.js";
 
@@ -91,7 +92,7 @@ function readTerminalSnapshotFromDedupeEntry(entry: DedupeEntry): AgentWaitTermi
       }
     | undefined;
   const status = typeof payload?.status === "string" ? payload.status : undefined;
-  if (status === "accepted" || status === "started" || status === "in_flight") {
+  if (isNonTerminalAgentRunStatus(status)) {
     return null;
   }
 
diff --git a/src/shared/agent-run-status.test.ts b/src/shared/agent-run-status.test.ts
new file mode 100644
index 00000000000..b4d70c63366
--- /dev/null
+++ b/src/shared/agent-run-status.test.ts
@@ -0,0 +1,15 @@
+import { describe, expect, it } from "vitest";
+import { isNonTerminalAgentRunStatus } from "./agent-run-status.js";
+
+describe("isNonTerminalAgentRunStatus", () => {
+  it.each(["accepted", "started", "in_flight"])("recognizes %s as non-terminal", (status) => {
+    expect(isNonTerminalAgentRunStatus(status)).toBe(true);
+  });
+
+  it.each(["ok", "error", "timeout", "queued", "", null, undefined, 1, {}, []])(
+    "does not recognize %s as non-terminal",
+    (status) => {
+      expect(isNonTerminalAgentRunStatus(status)).toBe(false);
+    },
+  );
+});
diff --git a/src/shared/agent-run-status.ts b/src/shared/agent-run-status.ts
new file mode 100644
index 00000000000..d43a4646b41
--- /dev/null
+++ b/src/shared/agent-run-status.ts
@@ -0,0 +1,5 @@
+const NON_TERMINAL_AGENT_RUN_STATUSES = new Set(["accepted", "started", "in_flight"]);
+
+export function isNonTerminalAgentRunStatus(status: unknown): boolean {
+  return typeof status === "string" && NON_TERMINAL_AGENT_RUN_STATUSES.has(status);
+}