diff --git a/CHANGELOG.md b/CHANGELOG.md
index a49a78997d3..9d08877a0a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -41,6 +41,7 @@ Docs: https://docs.openclaw.ai
 - Discord/timeouts: send a visible timeout reply when the inbound Discord worker times out before a final reply starts, including created auto-thread targets and queued-run ordering. (#53823) Thanks @Kimbo7870.
 - Models/google: normalize bare Google Generative AI API roots for custom provider names, and keep built-in Google model-id rewrites working when `api` is declared only on individual models, so custom Google lanes and older configs stop missing `/v1beta` or preview-id normalization. (#44969) Thanks @Kathie-yu.
 - Gateway/ports: parse Docker Compose-style `OPENCLAW_GATEWAY_PORT` host publish values correctly without reviving the legacy `CLAWDBOT_GATEWAY_PORT` override. (#44083) Thanks @bebule.
+- Feishu/MSTeams message tool: keep provider-native `card` payloads optional in merged tool schemas so media-only sends stop failing validation before channel runtime dispatch. (#53715) Thanks @lndyzwdxhs.
 
 ## 2026.3.23
 
diff --git a/src/agents/tools/message-tool.test.ts b/src/agents/tools/message-tool.test.ts
index 66410aea2e8..02369744d9b 100644
--- a/src/agents/tools/message-tool.test.ts
+++ b/src/agents/tools/message-tool.test.ts
@@ -3,7 +3,10 @@ import { afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "vite
 import type { ChannelMessageCapability } from "../../channels/plugins/message-capabilities.js";
 import type { ChannelMessageActionName, ChannelPlugin } from "../../channels/plugins/types.js";
 import type { MessageActionRunResult } from "../../infra/outbound/message-action-runner.js";
-import { createMessageToolButtonsSchema } from "../../plugin-sdk/channel-actions.js";
+import {
+  createMessageToolButtonsSchema,
+  createMessageToolCardSchema,
+} from "../../plugin-sdk/channel-actions.js";
 type CreateMessageTool = typeof import("./message-tool.js").createMessageTool;
 type SetActivePluginRegistry = typeof import("../../plugins/runtime.js").setActivePluginRegistry;
 type CreateTestRegistry = typeof import("../../test-utils/channel-plugins.js").createTestRegistry;
@@ -418,6 +421,38 @@ describe("message tool schema scoping", () => {
     expect(actionEnum).toContain("poll");
   });
 
+  it("keeps provider card schema optional after merging into the message tool schema", () => {
+    const feishuPlugin = createChannelPlugin({
+      id: "feishu",
+      label: "Feishu",
+      docsPath: "/channels/feishu",
+      blurb: "Feishu test plugin.",
+      actions: ["send"],
+      capabilities: ["cards"],
+      toolSchema: () => ({
+        properties: {
+          card: createMessageToolCardSchema(),
+        },
+      }),
+    });
+
+    setActivePluginRegistry(
+      createTestRegistry([{ pluginId: "feishu", source: "test", plugin: feishuPlugin }]),
+    );
+
+    const tool = createMessageTool({
+      config: {} as never,
+      currentChannelProvider: "feishu",
+    });
+    const schema = tool.parameters as {
+      properties?: Record<string, unknown>;
+      required?: string[];
+    };
+
+    expect(schema.properties?.card).toBeDefined();
+    expect(schema.required ?? []).not.toContain("card");
+  });
+
   it("hides telegram poll extras when telegram polls are disabled in scoped mode", () => {
     const telegramPluginWithConfig = createChannelPlugin({
       id: "telegram",