diff --git a/src/plugins/contracts/registry.retry.test.ts b/src/plugins/contracts/registry.retry.test.ts
index 044e4979484..6b4d6db25e7 100644
--- a/src/plugins/contracts/registry.retry.test.ts
+++ b/src/plugins/contracts/registry.retry.test.ts
@@ -144,4 +144,37 @@ describe("plugin contract registry scoped retries", () => {
     ).toEqual(["grok"]);
     expect(loadBundledCapabilityRuntimeRegistry).toHaveBeenCalledTimes(2);
   });
+
+  it("reuses the single registered provider contract for paired manifest alias ids", async () => {
+    const loadBundledCapabilityRuntimeRegistry = vi.fn().mockReturnValue(
+      createMockRuntimeRegistry({
+        plugin: {
+          id: "byteplus",
+          status: "loaded",
+          providerIds: ["byteplus"],
+          webSearchProviderIds: [],
+        },
+        providers: [
+          {
+            pluginId: "byteplus",
+            provider: {
+              id: "byteplus",
+              label: "BytePlus",
+              docsPath: "/providers/byteplus",
+              auth: [],
+            } as ProviderPlugin,
+          },
+        ],
+      }),
+    );
+
+    vi.doMock("../bundled-capability-runtime.js", () => ({
+      loadBundledCapabilityRuntimeRegistry,
+    }));
+
+    const { requireProviderContractProvider } = await import("./registry.js");
+
+    expect(requireProviderContractProvider("byteplus-plan").id).toBe("byteplus");
+    expect(loadBundledCapabilityRuntimeRegistry).toHaveBeenCalledTimes(1);
+  });
 });
diff --git a/src/plugins/contracts/registry.ts b/src/plugins/contracts/registry.ts
index 7922b49972b..0e4c5a1c6f5 100644
--- a/src/plugins/contracts/registry.ts
+++ b/src/plugins/contracts/registry.ts
@@ -395,10 +395,19 @@ export const providerContractCompatPluginIds: string[] = createLazyArrayView(
 );
 
 export function requireProviderContractProvider(providerId: string): ProviderPlugin {
-  const provider = loadProviderContractEntriesForPluginIds(
-    providerContractPluginIdsByProviderId.get(providerId) ?? [],
-  ).find((entry) => entry.provider.id === providerId)?.provider;
+  const pluginIds = providerContractPluginIdsByProviderId.get(providerId) ?? [];
+  const entries = loadProviderContractEntriesForPluginIds(pluginIds);
+  const provider = entries.find((entry) => entry.provider.id === providerId)?.provider;
   if (!provider) {
+    const pluginScopedProviders = [
+      ...new Map(entries.map((entry) => [entry.provider.id, entry.provider])).values(),
+    ];
+    // Paired catalogs may expose multiple runtime provider ids from one shared
+    // ProviderPlugin contract entry. Reuse that single contract surface for the
+    // manifest-owned alias ids instead of requiring duplicate registration.
+    if (pluginIds.length === 1 && pluginScopedProviders.length === 1) {
+      return pluginScopedProviders[0];
+    }
     if (providerContractLoadError) {
       throw new Error(
         `provider contract entry missing for ${providerId}; bundled provider registry failed to load: ${providerContractLoadError.message}`,