diff --git a/libs/common/src/platform/services/sdk/client-managed-state.spec.ts b/libs/common/src/platform/services/sdk/client-managed-state.spec.ts
index 574628290f11..ff82adfc644a 100644
--- a/libs/common/src/platform/services/sdk/client-managed-state.spec.ts
+++ b/libs/common/src/platform/services/sdk/client-managed-state.spec.ts
@@ -91,6 +91,63 @@ describe("RepositoryRecord", () => {
     });
   });
 
+  describe("shouldInclude filtering", () => {
+    // `excluded:`-prefixed values stand in for records the SDK cannot represent.
+    function createFilteringMapper(): SdkRecordMapper<ClientType, SdkType> {
+      return {
+        ...createMapper(),
+        shouldInclude: (value: ClientType) => !value.startsWith("excluded:"),
+      };
+    }
+
+    beforeEach(() => {
+      repo = new RepositoryRecord(userId, stateProvider, createFilteringMapper());
+    });
+
+    it("get returns the mapped value for an included element", async () => {
+      await setState({ "id-1": "value-1" });
+
+      const result = await repo.get("id-1");
+
+      expect(result).toEqual({ value: "value-1" });
+    });
+
+    it("get returns null for a stored but excluded element", async () => {
+      await setState({ "id-1": "excluded:value-1" });
+
+      const result = await repo.get("id-1");
+
+      expect(result).toBeNull();
+    });
+
+    it("list omits excluded elements and keeps the rest", async () => {
+      await setState({ "id-1": "value-1", "id-2": "excluded:value-2", "id-3": "value-3" });
+
+      const result = await repo.list();
+
+      expect(result).toEqual([{ value: "value-1" }, { value: "value-3" }]);
+    });
+
+    it("list returns everything when the mapper has no shouldInclude", async () => {
+      repo = new RepositoryRecord(userId, stateProvider, createMapper());
+      await setState({ "id-1": "value-1", "id-2": "excluded:value-2" });
+
+      const result = await repo.list();
+
+      expect(result).toEqual([{ value: "value-1" }, { value: "excluded:value-2" }]);
+    });
+
+    it("set still writes an excluded element to state", async () => {
+      await setState({});
+
+      await repo.set("id-1", { value: "excluded:value-1" });
+
+      // Excluding a record hides it from the SDK; it must still round-trip through client state.
+      expect(await getState()).toEqual({ "id-1": "excluded:value-1" });
+      expect(await repo.get("id-1")).toBeNull();
+    });
+  });
+
   describe("set", () => {
     it("adds new item to empty state", async () => {
       await setState({});
diff --git a/libs/common/src/platform/services/sdk/client-managed-state.ts b/libs/common/src/platform/services/sdk/client-managed-state.ts
index aadd9ab91b1c..e6ecb35c1eeb 100644
--- a/libs/common/src/platform/services/sdk/client-managed-state.ts
+++ b/libs/common/src/platform/services/sdk/client-managed-state.ts
@@ -38,6 +38,15 @@ export interface SdkRecordMapper<ClientType, SdkType> {
   userKeyDefinition(): UserKeyDefinition<Record<string, ClientType>>;
   toSdk(value: ClientType): SdkType;
   fromSdk(value: SdkType): ClientType;
+  /**
+   * Optional predicate to exclude entries from the SDK-visible view of state.
+   * Returning `false` makes {@link RepositoryRecord.get} return null and excludes
+   * the entry from {@link RepositoryRecord.list}. Use for records the SDK cannot
+   * represent, so it never has to parse them. Writes are unaffected — the entry
+   * still lives in client state and can be read through the client's own services.
+   * Defaults to including everything.
+   */
+  shouldInclude?(value: ClientType): boolean;
 }
 
 /**
@@ -67,12 +76,20 @@ export class RepositoryRecord<ClientType, SdkType> implements Repository<SdkType
   async get(id: string): Promise<SdkType | null> {
     const record = await this.getRecord();
     const element = record[id];
-    return element ? this.mapper.toSdk(element) : null;
+    if (!element || this.mapper.shouldInclude?.(element) === false) {
+      return null;
+    }
+    return this.mapper.toSdk(element);
   }
 
   async list(): Promise<SdkType[]> {
     const record = await this.getRecord();
-    return Object.values(record).map((element) => this.mapper.toSdk(element));
+    const elements = Object.values(record);
+    const included =
+      this.mapper.shouldInclude != null
+        ? elements.filter((element) => this.mapper.shouldInclude!(element))
+        : elements;
+    return included.map((element) => this.mapper.toSdk(element));
   }
 
   async set(id: string, value: SdkType): Promise<void> {