diff --git a/extensions/googlechat/src/channel.adapters.ts b/extensions/googlechat/src/channel.adapters.ts
index b203ce98a58..a1b91dbf25e 100644
--- a/extensions/googlechat/src/channel.adapters.ts
+++ b/extensions/googlechat/src/channel.adapters.ts
@@ -1,4 +1,8 @@
 import { adaptScopedAccountAccessor } from "openclaw/plugin-sdk/channel-config-helpers";
+import type {
+  ChannelThreadingContext,
+  ChannelThreadingToolContext,
+} from "openclaw/plugin-sdk/channel-contract";
 import {
   createMessageReceiptFromOutboundResults,
   defineChannelMessageAdapter,
@@ -127,6 +131,29 @@ export const googlechatThreadingAdapter = {
       account.config.replyToMode,
     fallback: "off" as const,
   },
+  buildToolContext: ({
+    cfg,
+    accountId,
+    context,
+    hasRepliedRef,
+  }: {
+    cfg: OpenClawConfig;
+    accountId?: string | null;
+    context: ChannelThreadingContext;
+    hasRepliedRef?: { value: boolean };
+  }): ChannelThreadingToolContext => {
+    const currentChannelId = normalizeGoogleChatTarget(context.To);
+    const replyToId =
+      normalizeOptionalString(context.ReplyToIdFull) ?? normalizeOptionalString(context.ReplyToId);
+
+    return {
+      currentChannelId,
+      currentMessageId: replyToId,
+      currentThreadTs: replyToId,
+      replyToMode: resolveGoogleChatAccount({ cfg, accountId }).config.replyToMode,
+      hasRepliedRef,
+    };
+  },
 };
 
 export const googlechatPairingTextAdapter = {
diff --git a/extensions/googlechat/src/channel.test.ts b/extensions/googlechat/src/channel.test.ts
index c9611ec299e..6d5164c77e8 100644
--- a/extensions/googlechat/src/channel.test.ts
+++ b/extensions/googlechat/src/channel.test.ts
@@ -439,6 +439,62 @@ describe("googlechatPlugin threading", () => {
       googlechatThreadingAdapter.scopedAccountReplyToMode.resolveReplyToMode(defaultAccount),
     ).toBe("all");
   });
+
+  it("uses the inbound thread resource as the current tool reply target", () => {
+    const cfg = {
+      channels: {
+        googlechat: {
+          replyToMode: "all",
+        },
+      },
+    } as OpenClawConfig;
+    const hasRepliedRef = { value: false };
+
+    const context = googlechatThreadingAdapter.buildToolContext({
+      cfg,
+      accountId: "default",
+      context: {
+        To: "googlechat:spaces/AAA",
+        CurrentMessageId: "spaces/AAA/messages/msg-1",
+        ReplyToId: "spaces/AAA/threads/thread-1",
+      },
+      hasRepliedRef,
+    });
+
+    expect(context).toMatchObject({
+      currentChannelId: "spaces/AAA",
+      currentMessageId: "spaces/AAA/threads/thread-1",
+      currentThreadTs: "spaces/AAA/threads/thread-1",
+      replyToMode: "all",
+      hasRepliedRef,
+    });
+  });
+
+  it("does not use message resources as implicit Google Chat reply targets", () => {
+    const cfg = {
+      channels: {
+        googlechat: {
+          replyToMode: "all",
+        },
+      },
+    } as OpenClawConfig;
+
+    const context = googlechatThreadingAdapter.buildToolContext({
+      cfg,
+      accountId: "default",
+      context: {
+        To: "googlechat:spaces/AAA",
+        CurrentMessageId: "spaces/AAA/messages/msg-1",
+      },
+    });
+
+    expect(context).toMatchObject({
+      currentChannelId: "spaces/AAA",
+      replyToMode: "all",
+    });
+    expect(context.currentMessageId).toBeUndefined();
+    expect(context.currentThreadTs).toBeUndefined();
+  });
 });
 
 const resolveTarget = googlechatOutboundAdapter.base.resolveTarget;
diff --git a/src/auto-reply/reply/agent-runner-utils.ts b/src/auto-reply/reply/agent-runner-utils.ts
index bde9793a347..51660728992 100644
--- a/src/auto-reply/reply/agent-runner-utils.ts
+++ b/src/auto-reply/reply/agent-runner-utils.ts
@@ -152,6 +152,7 @@ export function buildThreadingToolContext(params: {
         ChatType: sessionCtx.ChatType,
         CurrentMessageId: currentMessageId,
         ReplyToId: sessionCtx.ReplyToId,
+        ReplyToIdFull: sessionCtx.ReplyToIdFull,
         ThreadLabel: sessionCtx.ThreadLabel,
         MessageThreadId: sessionCtx.MessageThreadId,
         TransportThreadId: sessionCtx.TransportThreadId,
@@ -159,10 +160,13 @@ export function buildThreadingToolContext(params: {
       },
       hasRepliedRef,
     }) ?? {};
+  const hasAdapterCurrentMessageId = Object.hasOwn(context, "currentMessageId");
   return {
     ...context,
     currentChannelProvider: provider!, // guaranteed non-null since threading exists
-    currentMessageId: context.currentMessageId ?? currentMessageId,
+    // Some providers expose only thread resources as reply targets; explicit
+    // `undefined` means the adapter rejected the generic message-id fallback.
+    currentMessageId: hasAdapterCurrentMessageId ? context.currentMessageId : currentMessageId,
   };
 }
 
diff --git a/src/auto-reply/reply/reply-plumbing.test.ts b/src/auto-reply/reply/reply-plumbing.test.ts
index 5eff8ce5b8e..cc71780d311 100644
--- a/src/auto-reply/reply/reply-plumbing.test.ts
+++ b/src/auto-reply/reply/reply-plumbing.test.ts
@@ -193,6 +193,44 @@ describe("buildThreadingToolContext", () => {
     expect(result.currentChannelId).toBe("C1");
     expect(result.currentThreadTs).toBe("123.456");
   });
+
+  it("lets plugin threading adapters suppress the generic message-id fallback", () => {
+    setActivePluginRegistry(
+      createTestRegistry([
+        {
+          pluginId: "googlechat",
+          plugin: {
+            ...createChannelTestPluginBase({ id: "googlechat", label: "Google Chat" }),
+            threading: {
+              buildToolContext: ({ context }) => ({
+                currentChannelId: context.To?.replace(/^googlechat:/, ""),
+                currentMessageId: undefined,
+                currentThreadTs: context.ReplyToIdFull ?? context.ReplyToId,
+              }),
+            },
+          } as ChannelPlugin,
+          source: "test",
+        },
+      ]),
+    );
+    const sessionCtx = {
+      Provider: "googlechat",
+      To: "googlechat:spaces/AAA",
+      MessageSidFull: "spaces/AAA/messages/msg-1",
+      ReplyToId: "spaces/AAA/threads/short",
+      ReplyToIdFull: "spaces/AAA/threads/full",
+    } as TemplateContext;
+
+    const result = buildThreadingToolContext({
+      sessionCtx,
+      config: { channels: { googlechat: { replyToMode: "all" } } } as OpenClawConfig,
+      hasRepliedRef: undefined,
+    });
+
+    expect(result.currentChannelId).toBe("spaces/AAA");
+    expect(result.currentThreadTs).toBe("spaces/AAA/threads/full");
+    expect(result.currentMessageId).toBeUndefined();
+  });
 });
 
 describe("applyReplyThreading auto-threading", () => {