diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac14e4cee53..0c813ada47f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ Docs: https://docs.openclaw.ai
 
 - Docs/security hardening guidance: document Docker `DOCKER-USER` + UFW policy and add cross-linking from Docker install docs for VPS/public-host setups. (#27613) thanks @dorukardahan.
 - Docs/tool-loop detection config keys: align `docs/tools/loop-detection.md` examples and field names with the current `tools.loopDetection` schema to prevent copy-paste validation failures from outdated keys. (#33182) Thanks @Mylszd.
+- Gateway/session agent discovery: include disk-scanned agent IDs in `listConfiguredAgentIds` even when `agents.list` is configured, so disk-only/ACP agent sessions remain visible in gateway session aggregation and listings. (#32831) thanks @Sid-Qin.
 - Discord/inbound debouncer: skip bot-own MESSAGE_CREATE events before they reach the debounce queue to avoid self-triggered slowdowns in busy servers. Thanks @thewilloftheshadow.
 - Discord/Agent-scoped media roots: pass `mediaLocalRoots` through Discord monitor reply delivery (message + component interaction paths) so local media attachments honor per-agent workspace roots instead of falling back to default global roots. Thanks @thewilloftheshadow.
 - Discord/slash command handling: intercept text-based slash commands in channels, register plugin commands as native, and send fallback acknowledgments for empty slash runs so interactions do not hang. Thanks @thewilloftheshadow.
diff --git a/src/gateway/session-utils.test.ts b/src/gateway/session-utils.test.ts
index ff090f2248f..943aea46e90 100644
--- a/src/gateway/session-utils.test.ts
+++ b/src/gateway/session-utils.test.ts
@@ -4,12 +4,14 @@ import path from "node:path";
 import { describe, expect, test } from "vitest";
 import type { OpenClawConfig } from "../config/config.js";
 import type { SessionEntry } from "../config/sessions.js";
+import { withStateDirEnv } from "../test-helpers/state-dir-env.js";
 import {
   capArrayByJsonBytes,
   classifySessionKey,
   deriveSessionTitle,
   listAgentsForGateway,
   listSessionsFromStore,
+  loadCombinedSessionStoreForGateway,
   parseGroupKey,
   pruneLegacyStoreKeys,
   resolveGatewaySessionStoreTarget,
@@ -310,6 +312,21 @@ describe("gateway session utils", () => {
       `data:image/png;base64,${Buffer.from("avatar").toString("base64")}`,
     );
   });
+
+  test("listAgentsForGateway keeps explicit agents.list scope over disk-only agents (scope boundary)", async () => {
+    await withStateDirEnv("openclaw-agent-list-scope-", async ({ stateDir }) => {
+      fs.mkdirSync(path.join(stateDir, "agents", "main"), { recursive: true });
+      fs.mkdirSync(path.join(stateDir, "agents", "codex"), { recursive: true });
+
+      const cfg = {
+        session: { mainKey: "main" },
+        agents: { list: [{ id: "main", default: true }] },
+      } as OpenClawConfig;
+
+      const { agents } = listAgentsForGateway(cfg);
+      expect(agents.map((agent) => agent.id)).toEqual(["main"]);
+    });
+  });
 });
 
 describe("resolveSessionModelRef", () => {
@@ -746,3 +763,45 @@ describe("listSessionsFromStore search", () => {
     expect(missing?.totalTokensFresh).toBe(false);
   });
 });
+
+describe("loadCombinedSessionStoreForGateway includes disk-only agents (#32804)", () => {
+  test("ACP agent sessions are visible even when agents.list is configured", async () => {
+    await withStateDirEnv("openclaw-acp-vis-", async ({ stateDir }) => {
+      const agentsDir = path.join(stateDir, "agents");
+      const mainDir = path.join(agentsDir, "main", "sessions");
+      const codexDir = path.join(agentsDir, "codex", "sessions");
+      fs.mkdirSync(mainDir, { recursive: true });
+      fs.mkdirSync(codexDir, { recursive: true });
+
+      fs.writeFileSync(
+        path.join(mainDir, "sessions.json"),
+        JSON.stringify({
+          "agent:main:main": { sessionId: "s-main", updatedAt: 100 },
+        }),
+        "utf8",
+      );
+
+      fs.writeFileSync(
+        path.join(codexDir, "sessions.json"),
+        JSON.stringify({
+          "agent:codex:acp-task": { sessionId: "s-codex", updatedAt: 200 },
+        }),
+        "utf8",
+      );
+
+      const cfg = {
+        session: {
+          mainKey: "main",
+          store: path.join(stateDir, "agents", "{agentId}", "sessions", "sessions.json"),
+        },
+        agents: {
+          list: [{ id: "main", default: true }],
+        },
+      } as OpenClawConfig;
+
+      const { store } = loadCombinedSessionStoreForGateway(cfg);
+      expect(store["agent:main:main"]).toBeDefined();
+      expect(store["agent:codex:acp-task"]).toBeDefined();
+    });
+  });
+});
diff --git a/src/gateway/session-utils.ts b/src/gateway/session-utils.ts
index fa4c514388b..969c60c378c 100644
--- a/src/gateway/session-utils.ts
+++ b/src/gateway/session-utils.ts
@@ -310,35 +310,25 @@ function listExistingAgentIdsFromDisk(): string[] {
 }
 
 function listConfiguredAgentIds(cfg: OpenClawConfig): string[] {
-  const agents = cfg.agents?.list ?? [];
-  if (agents.length > 0) {
-    const ids = new Set<string>();
-    for (const entry of agents) {
-      if (entry?.id) {
-        ids.add(normalizeAgentId(entry.id));
-      }
-    }
-    const defaultId = normalizeAgentId(resolveDefaultAgentId(cfg));
-    ids.add(defaultId);
-    const sorted = Array.from(ids).filter(Boolean);
-    sorted.sort((a, b) => a.localeCompare(b));
-    return sorted.includes(defaultId)
-      ? [defaultId, ...sorted.filter((id) => id !== defaultId)]
-      : sorted;
-  }
-
   const ids = new Set<string>();
   const defaultId = normalizeAgentId(resolveDefaultAgentId(cfg));
   ids.add(defaultId);
+
+  for (const entry of cfg.agents?.list ?? []) {
+    if (entry?.id) {
+      ids.add(normalizeAgentId(entry.id));
+    }
+  }
+
   for (const id of listExistingAgentIdsFromDisk()) {
     ids.add(id);
   }
+
   const sorted = Array.from(ids).filter(Boolean);
   sorted.sort((a, b) => a.localeCompare(b));
-  if (sorted.includes(defaultId)) {
-    return [defaultId, ...sorted.filter((id) => id !== defaultId)];
-  }
-  return sorted;
+  return sorted.includes(defaultId)
+    ? [defaultId, ...sorted.filter((id) => id !== defaultId)]
+    : sorted;
 }
 
 export function listAgentsForGateway(cfg: OpenClawConfig): {