diff --git a/src/infra/outbound/message-action-runner.plugin-dispatch.test.ts b/src/infra/outbound/message-action-runner.plugin-dispatch.test.ts
index 7666188db1ef..24d0749fcbed 100644
--- a/src/infra/outbound/message-action-runner.plugin-dispatch.test.ts
+++ b/src/infra/outbound/message-action-runner.plugin-dispatch.test.ts
@@ -2937,6 +2937,51 @@ describe("runMessageAction plugin dispatch", () => {
       expectRecordFields(gatewayActionParams, { presentation }, "gateway action params");
     });
 
+    it("omits a blank shared-schema location from gateway-routed sends", async () => {
+      const cfg = {
+        channels: {
+          cardchat: {
+            enabled: true,
+          },
+        },
+        messages: { responsePrefix: "[Nexus]" },
+      } as OpenClawConfig;
+      mocks.callGatewayLeastPrivilege.mockResolvedValueOnce({
+        ok: true,
+        messageId: "card-location",
+      });
+
+      const result = await runMessageAction({
+        cfg,
+        action: "send",
+        params: {
+          channel: "cardchat",
+          target: "channel:test-card",
+          message: "hello",
+          location: "",
+        },
+        gateway: {
+          clientName: "cli",
+          mode: "cli",
+        },
+        dryRun: false,
+      });
+
+      expect(result.kind).toBe("send");
+      expect(result.handledBy).toBe("plugin");
+      expect(handleAction).not.toHaveBeenCalled();
+      const gatewayCall = readMockCallArg(
+        mocks.callGatewayLeastPrivilege,
+        "gateway least privilege call",
+      );
+      const gatewayActionParams = readRecordField(
+        readRecordField(gatewayCall, "params", "gateway call params"),
+        "params",
+        "gateway action params",
+      );
+      expect(gatewayActionParams).not.toHaveProperty("location");
+    });
+
     it("keeps gateway-routed chart presentations on the gateway", async () => {
       const presentation = {
         blocks: [
diff --git a/src/infra/outbound/message-action-runner.send-validation.test.ts b/src/infra/outbound/message-action-runner.send-validation.test.ts
index fbdaea1d41da..fa488526b256 100644
--- a/src/infra/outbound/message-action-runner.send-validation.test.ts
+++ b/src/infra/outbound/message-action-runner.send-validation.test.ts
@@ -472,6 +472,39 @@ describe("runMessageAction send validation", () => {
 
     expect(result.kind).toBe("send");
   });
+
+  it.each(["", " \t\n"])(
+    "treats blank shared-schema event location %j as omitted on send",
+    async (location) => {
+      const result = await runDrySend({
+        cfg: workspaceConfig,
+        actionParams: {
+          channel: "workspace",
+          target: "#C12345678",
+          message: "hello",
+          location,
+        },
+        toolContext: { currentChannelId: "C12345678" },
+      });
+
+      expect(result.kind).toBe("send");
+    },
+  );
+
+  it("keeps rejecting a non-empty event location string on send", async () => {
+    await expect(
+      runDrySend({
+        cfg: workspaceConfig,
+        actionParams: {
+          channel: "workspace",
+          target: "#C12345678",
+          message: "hello",
+          location: "Main stage",
+        },
+        toolContext: { currentChannelId: "C12345678" },
+      }),
+    ).rejects.toThrow("location must be an object");
+  });
 });
 
 describe("message body alias normalization", () => {
diff --git a/src/infra/outbound/message-action-runner.ts b/src/infra/outbound/message-action-runner.ts
index 9ab79c293e96..ecff00e3e36b 100644
--- a/src/infra/outbound/message-action-runner.ts
+++ b/src/infra/outbound/message-action-runner.ts
@@ -686,6 +686,17 @@ function updateSendPayloadPartsFromReplyPayload(
   };
 }
 
+function applySendLocationToActionParams(
+  actionParams: Record<string, unknown>,
+  location: ReplyPayload["location"],
+) {
+  if (location) {
+    actionParams.location = location;
+  } else {
+    delete actionParams.location;
+  }
+}
+
 function applySendPayloadPartsToActionParams(
   actionParams: Record<string, unknown>,
   parts: SendPayloadParts,
@@ -703,7 +714,7 @@ function applySendPayloadPartsToActionParams(
   actionParams.asVoice = parts.asVoice || undefined;
   actionParams.audioAsVoice = parts.asVoice || undefined;
   actionParams.asVideoNote = parts.payload.videoAsNote || undefined;
-  actionParams.location = parts.payload.location;
+  applySendLocationToActionParams(actionParams, parts.payload.location);
 }
 
 function collectMessageAttachmentMediaHints(value: unknown): string[] {
@@ -1188,7 +1199,14 @@ async function buildSendPayloadParts(params: {
     Boolean(mediaHint) || mediaUrlHints.length > 0 || attachmentMediaHints.length > 0;
   const hasPresentation = hasMessagePresentationBlocks(actionParams.presentation);
   const hasInteractive = hasLegacyInteractiveReplyBlocks(actionParams.interactive);
-  const location = normalizeOutboundLocation(actionParams.location);
+  const rawLocation = actionParams.location;
+  // The flat tool schema also carries scheduled-event `location` as a string,
+  // and some models pad unused optional slots with blanks. Keep real send locations strict.
+  const location =
+    typeof rawLocation === "string" && normalizeOptionalString(rawLocation) === undefined
+      ? undefined
+      : normalizeOutboundLocation(rawLocation);
+  applySendLocationToActionParams(actionParams, location);
   const caption = readStringParam(actionParams, "caption", { allowEmpty: true }) ?? "";
   let message =
     readStringParam(actionParams, "message", {