diff --git a/src/infra/outbound/message-action-runner.threading.test.ts b/src/infra/outbound/message-action-runner.threading.test.ts
index 0a6ca44e9..ecbc168ba 100644
--- a/src/infra/outbound/message-action-runner.threading.test.ts
+++ b/src/infra/outbound/message-action-runner.threading.test.ts
@@ -4,6 +4,7 @@ import type { OpenClawConfig } from "../../config/config.js";
 import { setActivePluginRegistry } from "../../plugins/runtime.js";
 import { createTestRegistry } from "../../test-utils/channel-plugins.js";
 import { slackPlugin } from "../../../extensions/slack/src/channel.js";
+import { telegramPlugin } from "../../../extensions/telegram/src/channel.js";
 
 const mocks = vi.hoisted(() => ({
   executeSendAction: vi.fn(),
@@ -116,3 +117,111 @@ describe("runMessageAction Slack threading", () => {
     expect(call?.ctx?.mirror?.sessionKey).toBe("agent:main:slack:channel:c123:thread:333.444");
   });
 });
+
+const telegramConfig = {
+  channels: {
+    telegram: {
+      enabled: true,
+      botToken: "test:token",
+    },
+  },
+} as MoltbotConfig;
+
+describe("runMessageAction thread id injection from toolContext", () => {
+  beforeEach(async () => {
+    const { createPluginRuntime } = await import("../../plugins/runtime/index.js");
+    const { setTelegramRuntime } = await import("../../../extensions/telegram/src/runtime.js");
+    const runtime = createPluginRuntime();
+    setTelegramRuntime(runtime);
+    setActivePluginRegistry(
+      createTestRegistry([
+        {
+          pluginId: "telegram",
+          source: "test",
+          plugin: telegramPlugin,
+        },
+      ]),
+    );
+  });
+
+  afterEach(() => {
+    setActivePluginRegistry(createTestRegistry([]));
+    mocks.executeSendAction.mockReset();
+    mocks.recordSessionMetaFromInbound.mockReset();
+  });
+
+  it("injects toolContext.currentThreadTs into params.threadId when not explicitly set", async () => {
+    mocks.executeSendAction.mockResolvedValue({
+      handledBy: "plugin",
+      payload: { ok: true, messageId: "123", chatId: "63448508" },
+    });
+
+    await runMessageAction({
+      cfg: telegramConfig,
+      action: "send",
+      params: {
+        channel: "telegram",
+        target: "63448508",
+        message: "hello from topic",
+      },
+      toolContext: {
+        currentChannelId: "63448508",
+        currentChannelProvider: "telegram",
+        currentThreadTs: "994409",
+      },
+    });
+
+    const call = mocks.executeSendAction.mock.calls[0]?.[0];
+    expect(call?.ctx?.params?.threadId).toBe("994409");
+  });
+
+  it("does not override explicit threadId with toolContext", async () => {
+    mocks.executeSendAction.mockResolvedValue({
+      handledBy: "plugin",
+      payload: { ok: true, messageId: "124", chatId: "63448508" },
+    });
+
+    await runMessageAction({
+      cfg: telegramConfig,
+      action: "send",
+      params: {
+        channel: "telegram",
+        target: "63448508",
+        message: "explicit thread",
+        threadId: "12345",
+      },
+      toolContext: {
+        currentChannelId: "63448508",
+        currentChannelProvider: "telegram",
+        currentThreadTs: "994409",
+      },
+    });
+
+    const call = mocks.executeSendAction.mock.calls[0]?.[0];
+    expect(call?.ctx?.params?.threadId).toBe("12345");
+  });
+
+  it("does not inject threadId when toolContext has no currentThreadTs", async () => {
+    mocks.executeSendAction.mockResolvedValue({
+      handledBy: "plugin",
+      payload: { ok: true, messageId: "125", chatId: "63448508" },
+    });
+
+    await runMessageAction({
+      cfg: telegramConfig,
+      action: "send",
+      params: {
+        channel: "telegram",
+        target: "63448508",
+        message: "no thread context",
+      },
+      toolContext: {
+        currentChannelId: "63448508",
+        currentChannelProvider: "telegram",
+      },
+    });
+
+    const call = mocks.executeSendAction.mock.calls[0]?.[0];
+    expect(call?.ctx?.params?.threadId).toBeUndefined();
+  });
+});
diff --git a/src/infra/outbound/message-action-runner.ts b/src/infra/outbound/message-action-runner.ts
index 98beaa828..11ac4fcc0 100644
--- a/src/infra/outbound/message-action-runner.ts
+++ b/src/infra/outbound/message-action-runner.ts
@@ -900,6 +900,13 @@ export async function runMessageAction(
     }
   }
 
+  // Inject thread id from session context when not explicitly provided.
+  // This ensures the message tool sends to the correct Telegram DM topic
+  // (or forum thread) instead of the General/root chat.
+  if (!params.threadId && input.toolContext?.currentThreadTs) {
+    params.threadId = input.toolContext.currentThreadTs;
+  }
+
   applyTargetToParams({ action, args: params });
   if (actionRequiresTarget(action)) {
     if (!actionHasTarget(action, params)) {