diff --git a/src/plugin-sdk/compat.ts b/src/plugin-sdk/compat.ts
index ad8d9ff5293..c87e2767d12 100644
--- a/src/plugin-sdk/compat.ts
+++ b/src/plugin-sdk/compat.ts
@@ -19,6 +19,7 @@ if (shouldWarnCompatImport) {
 
 export { emptyPluginConfigSchema } from "../plugins/config-schema.js";
 export { resolveControlCommandGate } from "../channels/command-gating.js";
+export { delegateCompactionToRuntime } from "../context-engine/delegate.js";
 
 export { createAccountStatusSink } from "./channel-lifecycle.js";
 export { createPluginRuntimeStore } from "./runtime-store.js";
diff --git a/src/plugin-sdk/root-alias.test.ts b/src/plugin-sdk/root-alias.test.ts
index 3c30dbee6be..6767ca773e3 100644
--- a/src/plugin-sdk/root-alias.test.ts
+++ b/src/plugin-sdk/root-alias.test.ts
@@ -127,6 +127,20 @@ describe("plugin-sdk root alias", () => {
     expect(Object.getOwnPropertyDescriptor(lazyRootSdk, "slowHelper")).toBeDefined();
   });
 
+  it("forwards delegateCompactionToRuntime through the compat-backed root alias", () => {
+    const delegateCompactionToRuntime = () => "delegated";
+    const lazyModule = loadRootAliasWithStubs({
+      monolithicExports: {
+        delegateCompactionToRuntime,
+      },
+    });
+    const lazyRootSdk = lazyModule.moduleExports;
+
+    expect(typeof lazyRootSdk.delegateCompactionToRuntime).toBe("function");
+    expect(lazyRootSdk.delegateCompactionToRuntime).toBe(delegateCompactionToRuntime);
+    expect("delegateCompactionToRuntime" in lazyRootSdk).toBe(true);
+  });
+
   it("loads legacy root exports through the merged root wrapper", { timeout: 240_000 }, () => {
     expect(typeof rootSdk.resolveControlCommandGate).toBe("function");
     expect(typeof rootSdk.default).toBe("object");