diff --git a/src/gateway/openai-http.message-channel.test.ts b/src/gateway/openai-http.message-channel.test.ts
new file mode 100644
index 00000000000..92c2a2ca21a
--- /dev/null
+++ b/src/gateway/openai-http.message-channel.test.ts
@@ -0,0 +1,43 @@
+import { describe, expect, it } from "vitest";
+import { agentCommand, installGatewayTestHooks, withGatewayServer } from "./test-helpers.js";
+
+installGatewayTestHooks({ scope: "test" });
+
+describe("OpenAI HTTP message channel", () => {
+  it("passes x-openclaw-message-channel through to agentCommand", async () => {
+    agentCommand.mockReset();
+    agentCommand.mockResolvedValueOnce({ payloads: [{ text: "ok" }] } as never);
+
+    await withGatewayServer(
+      async ({ port }) => {
+        const res = await fetch(`http://127.0.0.1:${port}/v1/chat/completions`, {
+          method: "POST",
+          headers: {
+            "content-type": "application/json",
+            authorization: "Bearer secret",
+            "x-openclaw-message-channel": "custom-client-channel",
+          },
+          body: JSON.stringify({
+            model: "openclaw",
+            messages: [{ role: "user", content: "hi" }],
+          }),
+        });
+
+        expect(res.status).toBe(200);
+        const firstCall = (agentCommand.mock.calls[0] as unknown[] | undefined)?.[0] as
+          | { messageChannel?: string }
+          | undefined;
+        expect(firstCall?.messageChannel).toBe("custom-client-channel");
+        await res.text();
+      },
+      {
+        serverOptions: {
+          host: "127.0.0.1",
+          auth: { mode: "token", token: "secret" },
+          controlUiEnabled: false,
+          openAiChatCompletionsEnabled: true,
+        },
+      },
+    );
+  });
+});
diff --git a/src/gateway/openai-http.ts b/src/gateway/openai-http.ts
index 8a616866752..b7b6e3daec3 100644
--- a/src/gateway/openai-http.ts
+++ b/src/gateway/openai-http.ts
@@ -5,6 +5,7 @@ import { agentCommand } from "../commands/agent.js";
 import { emitAgentEvent, onAgentEvent } from "../infra/agent-events.js";
 import { logWarn } from "../logger.js";
 import { defaultRuntime } from "../runtime.js";
+import { normalizeMessageChannel } from "../utils/message-channel.js";
 import { resolveAssistantStreamDeltaText } from "./agent-event-assistant-text.js";
 import {
   buildAgentMessageFromConversationEntries,
@@ -14,7 +15,7 @@ import type { AuthRateLimiter } from "./auth-rate-limit.js";
 import type { ResolvedGatewayAuth } from "./auth.js";
 import { sendJson, setSseHeaders, writeDone } from "./http-common.js";
 import { handleGatewayPostJsonEndpoint } from "./http-endpoint-helpers.js";
-import { resolveAgentIdForRequest, resolveSessionKey } from "./http-utils.js";
+import { getHeader, resolveAgentIdForRequest, resolveSessionKey } from "./http-utils.js";
 
 type OpenAiHttpOptions = {
   auth: ResolvedGatewayAuth;
@@ -45,6 +46,7 @@ function buildAgentCommandInput(params: {
   prompt: { message: string; extraSystemPrompt?: string };
   sessionKey: string;
   runId: string;
+  messageChannel: string;
 }) {
   return {
     message: params.prompt.message,
@@ -52,7 +54,7 @@ function buildAgentCommandInput(params: {
     sessionKey: params.sessionKey,
     runId: params.runId,
     deliver: false as const,
-    messageChannel: "webchat" as const,
+    messageChannel: params.messageChannel,
     bestEffortDeliver: false as const,
   };
 }
@@ -226,6 +228,8 @@ export async function handleOpenAiHttpRequest(
 
   const agentId = resolveAgentIdForRequest({ req, model });
   const sessionKey = resolveOpenAiSessionKey({ req, agentId, user });
+  const messageChannel =
+    normalizeMessageChannel(getHeader(req, "x-openclaw-message-channel") ?? "") ?? "webchat";
   const prompt = buildAgentPrompt(payload.messages);
   if (!prompt.message) {
     sendJson(res, 400, {
@@ -243,6 +247,7 @@ export async function handleOpenAiHttpRequest(
     prompt,
     sessionKey,
     runId,
+    messageChannel,
   });
 
   if (!stream) {