diff --git a/src/agents/tools/sessions-announce-target.ts b/src/agents/tools/sessions-announce-target.ts
index 0edfafdb2e0..6a9ca29dc1e 100644
--- a/src/agents/tools/sessions-announce-target.ts
+++ b/src/agents/tools/sessions-announce-target.ts
@@ -38,15 +38,21 @@ export async function resolveAnnounceTarget(params: {
       match?.deliveryContext && typeof match.deliveryContext === "object"
         ? (match.deliveryContext as Record<string, unknown>)
         : undefined;
+    const origin =
+      match?.origin && typeof match.origin === "object"
+        ? (match.origin as Record<string, unknown>)
+        : undefined;
     const channel =
       (typeof deliveryContext?.channel === "string" ? deliveryContext.channel : undefined) ??
-      (typeof match?.lastChannel === "string" ? match.lastChannel : undefined);
+      (typeof match?.lastChannel === "string" ? match.lastChannel : undefined) ??
+      (typeof origin?.provider === "string" ? origin.provider : undefined);
     const to =
       (typeof deliveryContext?.to === "string" ? deliveryContext.to : undefined) ??
       (typeof match?.lastTo === "string" ? match.lastTo : undefined);
     const accountId =
       (typeof deliveryContext?.accountId === "string" ? deliveryContext.accountId : undefined) ??
-      (typeof match?.lastAccountId === "string" ? match.lastAccountId : undefined);
+      (typeof match?.lastAccountId === "string" ? match.lastAccountId : undefined) ??
+      (typeof origin?.accountId === "string" ? origin.accountId : undefined);
     if (channel && to) {
       return { channel, to, accountId };
     }
diff --git a/src/agents/tools/sessions-helpers.ts b/src/agents/tools/sessions-helpers.ts
index 33b3ebc5dd8..bcb45bfd703 100644
--- a/src/agents/tools/sessions-helpers.ts
+++ b/src/agents/tools/sessions-helpers.ts
@@ -55,6 +55,7 @@ export type SessionListRow = {
   channel: string;
   origin?: {
     provider?: string;
+    accountId?: string;
   };
   spawnedBy?: string;
   label?: string;
diff --git a/src/agents/tools/sessions-list-tool.ts b/src/agents/tools/sessions-list-tool.ts
index 0b494a6d0ce..0df8955a96d 100644
--- a/src/agents/tools/sessions-list-tool.ts
+++ b/src/agents/tools/sessions-list-tool.ts
@@ -201,6 +201,15 @@ export function createSessionsListTool(opts?: {
           key: displayKey,
           kind,
           channel: derivedChannel,
+          origin:
+            originChannel ||
+            (typeof entryOrigin?.accountId === "string" ? entryOrigin.accountId : undefined)
+              ? {
+                  provider: originChannel,
+                  accountId:
+                    typeof entryOrigin?.accountId === "string" ? entryOrigin.accountId : undefined,
+                }
+              : undefined,
           spawnedBy:
             typeof entry.spawnedBy === "string"
               ? resolveDisplaySessionKey({
diff --git a/src/agents/tools/sessions.test.ts b/src/agents/tools/sessions.test.ts
index f324d43b775..4a96a04d1c6 100644
--- a/src/agents/tools/sessions.test.ts
+++ b/src/agents/tools/sessions.test.ts
@@ -272,6 +272,31 @@ describe("resolveAnnounceTarget", () => {
     expect(first).toBeDefined();
     expect(first?.method).toBe("sessions.list");
   });
+
+  it("falls back to origin provider and accountId from sessions.list when legacy route fields are absent", async () => {
+    callGatewayMock.mockResolvedValueOnce({
+      sessions: [
+        {
+          key: "agent:main:whatsapp:group:123@g.us",
+          origin: {
+            provider: "whatsapp",
+            accountId: "work",
+          },
+          lastTo: "123@g.us",
+        },
+      ],
+    });
+
+    const target = await resolveAnnounceTarget({
+      sessionKey: "agent:main:whatsapp:group:123@g.us",
+      displayKey: "agent:main:whatsapp:group:123@g.us",
+    });
+    expect(target).toEqual({
+      channel: "whatsapp",
+      to: "123@g.us",
+      accountId: "work",
+    });
+  });
 });
 
 describe("sessions_list gating", () => {