diff --git a/cli/shared/build-extensions.test.ts b/cli/shared/build-extensions.test.ts
index aa03248aa8..b9fb7c2b74 100644
--- a/cli/shared/build-extensions.test.ts
+++ b/cli/shared/build-extensions.test.ts
@@ -1,6 +1,8 @@
 import "#veryfront/schemas/_test-setup.ts";
 import { assertEquals, assertExists } from "#veryfront/testing/assert.ts";
 import { describe, it } from "#veryfront/testing/bdd.ts";
+import { EvalReportExporterRegistryName } from "veryfront/extensions/eval";
+import { LLMProviderRegistryName } from "veryfront/extensions/llm";
 import { setupBuildCliExtensions } from "./build-extensions.ts";
 
 /** Minimal stand-in for the loader; the build path only needs it to resolve. */
@@ -61,6 +63,18 @@ describe("cli/shared/build-extensions", () => {
     assertEquals(names.has("ext-content-mdx"), true);
   });
 
+  it("primes the contracts required by built-in providers and exporters", async () => {
+    let primeContracts: Record<string, unknown> = {};
+
+    await setupBuildCliExtensions("/projects/app", {}, (options) => {
+      primeContracts = options.primeContracts ?? {};
+      return Promise.resolve(loaderStub);
+    });
+
+    assertExists(primeContracts[LLMProviderRegistryName]);
+    assertExists(primeContracts[EvalReportExporterRegistryName]);
+  });
+
   it("hands orchestration a logger it can actually log through", async () => {
     // Not "names the build": cliLogger.component() deliberately returns the
     // same logger, because CLI output carries no structured component tag. So
diff --git a/cli/shared/build-extensions.ts b/cli/shared/build-extensions.ts
index 538a7694a5..d199580f46 100644
--- a/cli/shared/build-extensions.ts
+++ b/cli/shared/build-extensions.ts
@@ -26,6 +26,11 @@
  */
 
 import { orchestrateExtensions } from "veryfront/extensions";
+import {
+  createEvalReportExporterRegistry,
+  EvalReportExporterRegistryName,
+} from "veryfront/extensions/eval";
+import { createLLMProviderRegistry, LLMProviderRegistryName } from "veryfront/extensions/llm";
 import { cliLogger } from "#cli/utils";
 import { createBuiltinExtensions } from "../../src/extensions/builtin-extensions.ts";
 
@@ -46,6 +51,10 @@ export async function setupBuildCliExtensions(
     projectDir,
     config,
     logger: cliLogger.component("build-extensions"),
+    primeContracts: {
+      [LLMProviderRegistryName]: createLLMProviderRegistry(),
+      [EvalReportExporterRegistryName]: createEvalReportExporterRegistry(),
+    },
     builtinExtensions: createBuiltinExtensions(),
   });
 }