diff --git a/CHANGELOG.md b/CHANGELOG.md
index 399369fde..e9b0a3e17 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 - CLI: `clawdbot sessions` now includes `elev:*` + `usage:*` flags in the table output.
 - Branding: normalize user-facing “ClawdBot”/“CLAWDBOT” → “Clawdbot” (CLI, status, docs).
 - Models/Auth: allow MiniMax API configs without `models.providers.minimax.apiKey` (auth profiles / `MINIMAX_API_KEY`). (#656) — thanks @mneves75.
+- Agents: avoid duplicate replies when the message tool sends. (#659) — thanks @mickahouan.
 
 ## 2026.1.9
 
diff --git a/src/agents/pi-embedded-subscribe.test.ts b/src/agents/pi-embedded-subscribe.test.ts
index c238b2b8b..0a0035716 100644
--- a/src/agents/pi-embedded-subscribe.test.ts
+++ b/src/agents/pi-embedded-subscribe.test.ts
@@ -456,6 +456,53 @@ describe("subscribeEmbeddedPiSession", () => {
     expect(subscription.assistantTexts).toEqual(["Hello block"]);
   });
 
+  it("suppresses message_end block replies when the message tool already sent", () => {
+    let handler: ((evt: unknown) => void) | undefined;
+    const session: StubSession = {
+      subscribe: (fn) => {
+        handler = fn;
+        return () => {};
+      },
+    };
+
+    const onBlockReply = vi.fn();
+
+    subscribeEmbeddedPiSession({
+      session: session as unknown as Parameters<
+        typeof subscribeEmbeddedPiSession
+      >[0]["session"],
+      runId: "run",
+      onBlockReply,
+      blockReplyBreak: "message_end",
+    });
+
+    const messageText = "This is the answer.";
+
+    handler?.({
+      type: "tool_execution_start",
+      toolName: "message",
+      toolCallId: "tool-message-1",
+      args: { action: "send", to: "+1555", message: messageText },
+    });
+
+    handler?.({
+      type: "tool_execution_end",
+      toolName: "message",
+      toolCallId: "tool-message-1",
+      isError: false,
+      result: "ok",
+    });
+
+    const assistantMessage = {
+      role: "assistant",
+      content: [{ type: "text", text: messageText }],
+    } as AssistantMessage;
+
+    handler?.({ type: "message_end", message: assistantMessage });
+
+    expect(onBlockReply).not.toHaveBeenCalled();
+  });
+
   it("clears block reply state on message_start", () => {
     let handler: ((evt: unknown) => void) | undefined;
     const session: StubSession = {
diff --git a/src/agents/pi-embedded-subscribe.ts b/src/agents/pi-embedded-subscribe.ts
index 1f2350e11..b8d41040a 100644
--- a/src/agents/pi-embedded-subscribe.ts
+++ b/src/agents/pi-embedded-subscribe.ts
@@ -242,6 +242,16 @@ function extractMessagingToolSend(
       ? { tool: toolName, provider: "telegram", accountId, to }
       : undefined;
   }
+  if (toolName === "message") {
+    if (action !== "send" && action !== "thread-reply") return undefined;
+    const toRaw = typeof args.to === "string" ? args.to : undefined;
+    if (!toRaw) return undefined;
+    const providerRaw =
+      typeof args.provider === "string" ? args.provider.trim() : "";
+    const provider = providerRaw || "message";
+    const to = toRaw.trim();
+    return to ? { tool: toolName, provider, accountId, to } : undefined;
+  }
   return undefined;
 }
 
@@ -310,6 +320,7 @@ export function subscribeEmbeddedPiSession(params: {
     "whatsapp",
     "discord",
     "slack",
+    "message",
     "sessions_send",
   ]);
   const messagingToolSentTexts: string[] = [];
@@ -547,13 +558,18 @@ export function subscribeEmbeddedPiSession(params: {
               ? (args as Record<string, unknown>)
               : {};
           const action =
-            typeof argsRecord.action === "string" ? argsRecord.action : "";
-          // Track send actions: sendMessage/threadReply for Discord/Slack, or sessions_send (no action field)
-          if (
+            typeof argsRecord.action === "string"
+              ? argsRecord.action.trim()
+              : "";
+          // Track send actions: sendMessage/threadReply for Discord/Slack, sessions_send (no action field),
+          // and message/send or message/thread-reply for the generic message tool.
+          const isMessagingSend =
             action === "sendMessage" ||
             action === "threadReply" ||
-            toolName === "sessions_send"
-          ) {
+            toolName === "sessions_send" ||
+            (toolName === "message" &&
+              (action === "send" || action === "thread-reply"));
+          if (isMessagingSend) {
             const sendTarget = extractMessagingToolSend(toolName, argsRecord);
             if (sendTarget) {
               pendingMessagingTargets.set(toolCallId, sendTarget);