diff --git a/src/agents/tools/sessions-helpers.ts b/src/agents/tools/sessions-helpers.ts
index fb40de14d252..984feefed15e 100644
--- a/src/agents/tools/sessions-helpers.ts
+++ b/src/agents/tools/sessions-helpers.ts
@@ -23,6 +23,7 @@ export {
 import { normalizeOptionalString, type FastMode } from "@openclaw/normalization-core/string-coerce";
 import { getRuntimeConfig } from "../../config/config.js";
 import type { OpenClawConfig } from "../../config/types.openclaw.js";
+import { parseRawSessionConversationRef } from "../../sessions/session-key-utils.js";
 import type { FastModeSource } from "../../shared/fast-mode.js";
 
 /** Coarse session category used by session list/status tools. */
@@ -157,11 +158,5 @@ export function deriveChannel(params: {
   if (lastChannel) {
     return lastChannel;
   }
-  const parts = params.key.split(":").filter(Boolean);
-  const scope = parts.at(1);
-  const keyChannel = parts.at(0);
-  if (parts.length >= 3 && keyChannel && (scope === "group" || scope === "channel")) {
-    return keyChannel;
-  }
-  return "unknown";
+  return parseRawSessionConversationRef(params.key)?.channel ?? "unknown";
 }
diff --git a/src/agents/tools/sessions-list-tool.test.ts b/src/agents/tools/sessions-list-tool.test.ts
index 6cc8f46fdbea..64608e79540f 100644
--- a/src/agents/tools/sessions-list-tool.test.ts
+++ b/src/agents/tools/sessions-list-tool.test.ts
@@ -44,6 +44,7 @@ vi.mock("./sessions-helpers.js", async (importActual) => {
 
 type SessionsListDetails = {
   sessions?: Array<{
+    channel?: string;
     deliveryContext?: {
       accountId?: string;
       channel?: string;
@@ -202,6 +203,57 @@ describe("sessions-list-tool", () => {
     });
   });
 
+  it("derives channels only from structurally valid group session keys", async () => {
+    mocks.gatewayCall.mockImplementation(async (opts: unknown) => {
+      const request = opts as { method?: string };
+      if (request.method === "sessions.list") {
+        return {
+          path: "/tmp/sessions.json",
+          sessions: [
+            {
+              key: "agent:main:slack:channel:C123:thread:1710000000.000100",
+              kind: "group",
+              sessionId: "sess-slack-thread",
+            },
+            {
+              key: "discord:group:ops",
+              kind: "group",
+              sessionId: "sess-discord-group",
+            },
+            {
+              key: "agent:main:matrix:channel:!room:[2001:db8::1]",
+              kind: "group",
+              sessionId: "sess-matrix-room",
+            },
+            {
+              key: "agent:main:agent:plugin:slack:channel:C123",
+              kind: "group",
+              sessionId: "sess-nested-agent",
+            },
+            {
+              key: "agent::slack:channel:C123",
+              kind: "group",
+              sessionId: "sess-malformed-agent",
+            },
+          ],
+        };
+      }
+      return {};
+    });
+    const tool = createSessionsListTool({ config: {} as never });
+
+    const result = await tool.execute("call-agent-scoped-channel", {});
+    const details = getSessionsListDetails(result);
+
+    expect(details.sessions?.map((session) => session.channel)).toEqual([
+      "slack",
+      "discord",
+      "matrix",
+      "unknown",
+      "unknown",
+    ]);
+  });
+
   it("keeps live session setting metadata in sessions_list results", async () => {
     mocks.gatewayCall.mockImplementation(async (opts: unknown) => {
       const request = opts as { method?: string };