diff --git a/extensions/feishu/src/conversation-id.test.ts b/extensions/feishu/src/conversation-id.test.ts
new file mode 100644
index 00000000000..2411d884610
--- /dev/null
+++ b/extensions/feishu/src/conversation-id.test.ts
@@ -0,0 +1,18 @@
+import { describe, expect, it } from "vitest";
+import { buildFeishuModelOverrideParentCandidates } from "./conversation-id.js";
+
+describe("buildFeishuModelOverrideParentCandidates", () => {
+  it("returns topic and chat fallback ids for sender-scoped topics", () => {
+    expect(
+      buildFeishuModelOverrideParentCandidates(
+        "oc_group_chat:Topic:om_topic_root:Sender:ou_topic_user",
+      ),
+    ).toEqual(["oc_group_chat:topic:om_topic_root", "oc_group_chat"]);
+  });
+
+  it("returns chat fallback ids for sender-scoped chats", () => {
+    expect(buildFeishuModelOverrideParentCandidates("oc_group_chat:sender:ou_topic_user")).toEqual([
+      "oc_group_chat",
+    ]);
+  });
+});
diff --git a/src/channels/model-overrides.test.ts b/src/channels/model-overrides.test.ts
index ef00f76a7c0..bc3d6e6e8ae 100644
--- a/src/channels/model-overrides.test.ts
+++ b/src/channels/model-overrides.test.ts
@@ -1,6 +1,6 @@
 import { beforeEach, describe, expect, it } from "vitest";
 import type { OpenClawConfig } from "../config/config.js";
-import { resetPluginRuntimeStateForTest, setActivePluginRegistry } from "../plugins/runtime.js";
+import { setActivePluginRegistry } from "../plugins/runtime.js";
 import { createTestRegistry } from "../test-utils/channel-plugins.js";
 import { createSessionConversationTestRegistry } from "../test-utils/session-conversation-registry.js";
 import { resolveChannelModelOverride } from "./model-overrides.js";
@@ -64,48 +64,6 @@ describe("resolveChannelModelOverride", () => {
       },
       expected: { model: "demo-provider/demo-parent-model", matchKey: "123" },
     },
-    {
-      name: "preserves feishu topic ids for direct matches",
-      input: {
-        cfg: {
-          channels: {
-            modelByChannel: {
-              feishu: {
-                "oc_group_chat:topic:om_topic_root": "demo-provider/demo-feishu-topic-model",
-              },
-            },
-          },
-        } as unknown as OpenClawConfig,
-        channel: "feishu",
-        groupId: "oc_group_chat:topic:om_topic_root",
-      },
-      expected: {
-        model: "demo-provider/demo-feishu-topic-model",
-        matchKey: "oc_group_chat:topic:om_topic_root",
-      },
-    },
-    {
-      name: "preserves feishu topic ids when falling back from parent session key",
-      input: {
-        cfg: {
-          channels: {
-            modelByChannel: {
-              feishu: {
-                "oc_group_chat:topic:om_topic_root": "demo-provider/demo-feishu-topic-model",
-              },
-            },
-          },
-        } as unknown as OpenClawConfig,
-        channel: "feishu",
-        groupId: "unrelated",
-        parentSessionKey:
-          "agent:main:feishu:group:oc_group_chat:topic:om_topic_root:sender:ou_topic_user",
-      },
-      expected: {
-        model: "demo-provider/demo-feishu-topic-model",
-        matchKey: "oc_group_chat:topic:om_topic_root",
-      },
-    },
   ] as const)("$name", ({ input, expected }) => {
     const resolved = resolveChannelModelOverride(input);
     expect(resolved?.model).toBe(expected.model);
@@ -168,48 +126,58 @@ describe("resolveChannelModelOverride", () => {
     expect(resolved?.matchKey).toBe("thread-parent");
   });
 
-  it("keeps bundled Feishu parent fallback matching before registry bootstrap", () => {
-    resetPluginRuntimeStateForTest();
+  it("uses plugin-owned parent fallback candidates", () => {
+    setActivePluginRegistry(
+      createTestRegistry([
+        {
+          pluginId: "scoped-chat",
+          source: "test",
+          plugin: {
+            id: "scoped-chat",
+            meta: {
+              id: "scoped-chat",
+              label: "Scoped Chat",
+              selectionLabel: "Scoped Chat",
+              docsPath: "/channels/scoped-chat",
+              blurb: "test stub.",
+            },
+            capabilities: { chatTypes: ["group"] },
+            conversationBindings: {
+              buildModelOverrideParentCandidates: ({
+                parentConversationId,
+              }: {
+                parentConversationId?: string | null;
+              }) =>
+                parentConversationId === "room:topic:thread:sender:user"
+                  ? ["room:topic:thread", "room"]
+                  : [],
+            },
+            config: {
+              listAccountIds: () => ["default"],
+              resolveAccount: () => ({}),
+            },
+          },
+        },
+      ]),
+    );
 
     const resolved = resolveChannelModelOverride({
       cfg: {
         channels: {
           modelByChannel: {
-            feishu: {
-              "oc_group_chat:topic:om_topic_root": "demo-provider/demo-feishu-topic-model",
+            "scoped-chat": {
+              "room:topic:thread": "demo-provider/demo-scoped-model",
             },
           },
         },
       } as unknown as OpenClawConfig,
-      channel: "feishu",
+      channel: "scoped-chat",
       groupId: "unrelated",
-      parentSessionKey:
-        "agent:main:feishu:group:oc_group_chat:topic:om_topic_root:sender:ou_topic_user",
+      parentSessionKey: "agent:main:scoped-chat:group:room:topic:thread:sender:user",
     });
 
-    expect(resolved?.model).toBe("demo-provider/demo-feishu-topic-model");
-    expect(resolved?.matchKey).toBe("oc_group_chat:topic:om_topic_root");
-  });
-
-  it("keeps mixed-case Feishu scoped markers when matching parent session fallbacks", () => {
-    const resolved = resolveChannelModelOverride({
-      cfg: {
-        channels: {
-          modelByChannel: {
-            feishu: {
-              "oc_group_chat:topic:om_topic_root": "demo-provider/demo-feishu-topic-model",
-            },
-          },
-        },
-      } as unknown as OpenClawConfig,
-      channel: "feishu",
-      groupId: "unrelated",
-      parentSessionKey:
-        "agent:main:feishu:group:oc_group_chat:Topic:om_topic_root:Sender:ou_topic_user",
-    });
-
-    expect(resolved?.model).toBe("demo-provider/demo-feishu-topic-model");
-    expect(resolved?.matchKey).toBe("oc_group_chat:topic:om_topic_root");
+    expect(resolved?.model).toBe("demo-provider/demo-scoped-model");
+    expect(resolved?.matchKey).toBe("room:topic:thread");
   });
 
   it("prefers parent conversation ids over channel-name fallbacks", () => {
diff --git a/src/channels/model-overrides.ts b/src/channels/model-overrides.ts
index 010235943f3..7425bf25d95 100644
--- a/src/channels/model-overrides.ts
+++ b/src/channels/model-overrides.ts
@@ -69,10 +69,6 @@ function buildChannelCandidates(
     normalizeOptionalLowercaseString(params.channel);
   const groupId = normalizeOptionalString(params.groupId);
   const sessionConversation = resolveSessionConversationRef(params.parentSessionKey);
-  const feishuParentOverrideFallbacks =
-    normalizedChannel === "feishu"
-      ? buildFeishuParentOverrideCandidates(sessionConversation?.rawId)
-      : [];
   const parentOverrideFallbacks =
     (normalizedChannel
       ? getChannelPlugin(
@@ -105,7 +101,6 @@ function buildChannelCandidates(
       sessionConversation?.rawId,
       ...(groupConversation?.parentConversationCandidates ?? []),
       ...(sessionConversation?.parentConversationCandidates ?? []),
-      ...feishuParentOverrideFallbacks,
       ...parentOverrideFallbacks,
     ),
     parentKeys: buildChannelKeyCandidates(
@@ -128,48 +123,15 @@ function buildGenericParentOverrideCandidates(sessionKey: string | null | undefi
   return buildChannelKeyCandidates(threadId ? baseSessionKey : raw.rawId);
 }
 
-function buildFeishuParentOverrideCandidates(rawId: string | undefined): string[] {
-  const value = normalizeOptionalString(rawId);
-  if (!value) {
-    return [];
-  }
-  const topicSenderMatch = value.match(/^(.+):topic:([^:]+):sender:([^:]+)$/i);
-  if (topicSenderMatch) {
-    const chatId = normalizeOptionalLowercaseString(topicSenderMatch[1]);
-    const topicId = normalizeOptionalLowercaseString(topicSenderMatch[2]);
-    return [`${chatId}:topic:${topicId}`, chatId].filter((entry): entry is string =>
-      Boolean(entry),
-    );
-  }
-  const topicMatch = value.match(/^(.+):topic:([^:]+)$/i);
-  if (topicMatch) {
-    const chatId = normalizeOptionalLowercaseString(topicMatch[1]);
-    const topicId = normalizeOptionalLowercaseString(topicMatch[2]);
-    return [`${chatId}:topic:${topicId}`, chatId].filter((entry): entry is string =>
-      Boolean(entry),
-    );
-  }
-  const senderMatch = value.match(/^(.+):sender:([^:]+)$/i);
-  if (senderMatch) {
-    const chatId = normalizeOptionalLowercaseString(senderMatch[1]);
-    return chatId ? [chatId] : [];
-  }
-  return [];
-}
-
 function resolveDirectChannelModelMatch(params: {
   channel: string;
   providerEntries: Record<string, string>;
   groupId?: string | null;
   parentSessionKey?: string | null;
 }): { model: string; matchKey?: string; matchSource?: ChannelMatchSource } | null {
-  const rawParent = parseRawSessionConversationRef(params.parentSessionKey);
   const directKeys = buildChannelKeyCandidates(
     params.groupId,
     ...buildGenericParentOverrideCandidates(params.parentSessionKey),
-    ...(normalizeOptionalLowercaseString(params.channel) === "feishu"
-      ? buildFeishuParentOverrideCandidates(rawParent?.rawId)
-      : []),
   );
   if (directKeys.length === 0) {
     return null;
diff --git a/src/secrets/channel-contract-surface-guardrails.test.ts b/src/secrets/channel-contract-surface-guardrails.test.ts
index 876e8ab83d2..ce2ee815623 100644
--- a/src/secrets/channel-contract-surface-guardrails.test.ts
+++ b/src/secrets/channel-contract-surface-guardrails.test.ts
@@ -54,6 +54,10 @@ const CORE_SECRET_SURFACE_GUARDS = [
     path: "src/gateway/channel-health-policy.ts",
     forbiddenPatterns: [/\btelegram\b/],
   },
+  {
+    path: "src/channels/model-overrides.ts",
+    forbiddenPatterns: [/\bfeishu\b/],
+  },
   {
     path: "src/media-understanding/defaults.ts",
     forbiddenPatterns: [