diff --git a/CHANGELOG.md b/CHANGELOG.md
index 647c67912..c363a6c74 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -31,6 +31,7 @@
 
 ### Fixes
 - Sub-agents: normalize announce delivery origin + queue bucketing by accountId to keep multi-account routing stable. (#1061, #1058) — thanks @adam91holt.
+- Gateway: honor explicit delivery targets without implicit accountId fallback; preserve lastAccountId for implicit routing.
 - Repo: fix oxlint config filename and move ignore pattern into config. (#1064) — thanks @connorshea.
 - Messages: `/stop` now hard-aborts queued followups and sub-agent runs; suppress zero-count stop notes.
 - Sessions: reset `compactionCount` on `/new` and `/reset`, and preserve `sessions.json` file mode (0600).
diff --git a/src/gateway/server-methods/agent.ts b/src/gateway/server-methods/agent.ts
index 280fb5ec0..8d5544f1a 100644
--- a/src/gateway/server-methods/agent.ts
+++ b/src/gateway/server-methods/agent.ts
@@ -155,6 +155,7 @@ export const agentHandlers: GatewayRequestHandlers = {
         skillsSnapshot: entry?.skillsSnapshot,
         lastChannel: entry?.lastChannel,
         lastTo: entry?.lastTo,
+        lastAccountId: entry?.lastAccountId,
         modelOverride: entry?.modelOverride,
         providerOverride: entry?.providerOverride,
         label: labelValue,
@@ -201,8 +202,11 @@ export const agentHandlers: GatewayRequestHandlers = {
 
     const lastChannel = sessionEntry?.lastChannel;
     const lastTo = typeof sessionEntry?.lastTo === "string" ? sessionEntry.lastTo.trim() : "";
+    const explicitTo =
+      typeof request.to === "string" && request.to.trim() ? request.to.trim() : undefined;
     const resolvedAccountId =
-      normalizeAccountId(request.accountId) ?? normalizeAccountId(sessionEntry?.lastAccountId);
+      normalizeAccountId(request.accountId) ??
+      (explicitTo ? undefined : normalizeAccountId(sessionEntry?.lastAccountId));
 
     const wantsDelivery = request.deliver === true;
 
@@ -224,8 +228,6 @@ export const agentHandlers: GatewayRequestHandlers = {
       return wantsDelivery ? DEFAULT_CHAT_CHANNEL : INTERNAL_MESSAGE_CHANNEL;
     })();
 
-    const explicitTo =
-      typeof request.to === "string" && request.to.trim() ? request.to.trim() : undefined;
     const deliveryTargetMode = explicitTo
       ? "explicit"
       : isDeliverableMessageChannel(resolvedChannel)
diff --git a/src/gateway/server.agent.gateway-server-agent-a.test.ts b/src/gateway/server.agent.gateway-server-agent-a.test.ts
index bc0f75735..cab401a86 100644
--- a/src/gateway/server.agent.gateway-server-agent-a.test.ts
+++ b/src/gateway/server.agent.gateway-server-agent-a.test.ts
@@ -152,6 +152,95 @@ describe("gateway server agent", () => {
     testState.allowFrom = undefined;
   });
 
+  test("agent avoids lastAccountId when explicit to is provided", async () => {
+    testState.allowFrom = ["+1555"];
+    const dir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-gw-"));
+    testState.sessionStorePath = path.join(dir, "sessions.json");
+    await fs.writeFile(
+      testState.sessionStorePath,
+      JSON.stringify(
+        {
+          main: {
+            sessionId: "sess-main-explicit",
+            updatedAt: Date.now(),
+            lastChannel: "whatsapp",
+            lastTo: "+1555",
+            lastAccountId: "legacy",
+          },
+        },
+        null,
+        2,
+      ),
+      "utf-8",
+    );
+
+    const { server, ws } = await startServerWithClient();
+    await connectOk(ws);
+
+    const res = await rpcReq(ws, "agent", {
+      message: "hi",
+      sessionKey: "main",
+      deliver: true,
+      to: "+1666",
+      idempotencyKey: "idem-agent-explicit",
+    });
+    expect(res.ok).toBe(true);
+
+    const spy = vi.mocked(agentCommand);
+    const call = spy.mock.calls.at(-1)?.[0] as Record<string, unknown>;
+    expectChannels(call, "whatsapp");
+    expect(call.to).toBe("+1666");
+    expect(call.accountId).toBeUndefined();
+
+    ws.close();
+    await server.close();
+    testState.allowFrom = undefined;
+  });
+
+  test("agent falls back to lastAccountId for implicit delivery", async () => {
+    testState.allowFrom = ["+1555"];
+    const dir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-gw-"));
+    testState.sessionStorePath = path.join(dir, "sessions.json");
+    await fs.writeFile(
+      testState.sessionStorePath,
+      JSON.stringify(
+        {
+          main: {
+            sessionId: "sess-main-implicit",
+            updatedAt: Date.now(),
+            lastChannel: "whatsapp",
+            lastTo: "+1555",
+            lastAccountId: "kev",
+          },
+        },
+        null,
+        2,
+      ),
+      "utf-8",
+    );
+
+    const { server, ws } = await startServerWithClient();
+    await connectOk(ws);
+
+    const res = await rpcReq(ws, "agent", {
+      message: "hi",
+      sessionKey: "main",
+      deliver: true,
+      idempotencyKey: "idem-agent-implicit-account",
+    });
+    expect(res.ok).toBe(true);
+
+    const spy = vi.mocked(agentCommand);
+    const call = spy.mock.calls.at(-1)?.[0] as Record<string, unknown>;
+    expectChannels(call, "whatsapp");
+    expect(call.to).toBe("+1555");
+    expect(call.accountId).toBe("kev");
+
+    ws.close();
+    await server.close();
+    testState.allowFrom = undefined;
+  });
+
   test("agent forwards image attachments as images[]", async () => {
     const dir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-gw-"));
     testState.sessionStorePath = path.join(dir, "sessions.json");