diff --git a/.github/workflows/runner-chaos-evals.yml b/.github/workflows/runner-chaos-evals.yml
index fbb60238de3..602d9e65fee 100644
--- a/.github/workflows/runner-chaos-evals.yml
+++ b/.github/workflows/runner-chaos-evals.yml
@@ -50,6 +50,9 @@ jobs:
           pnpm --filter @paperclipai/paperclip-eval-kernel build
           pnpm --filter @paperclipai/paperclip-runner report:runner-chaos-evals
 
+      - name: Build native Runner test binaries
+        run: pnpm --filter @paperclipai/paperclip-runner build:rust
+
       - name: Run Runner fault and replay suites
         run: |
           pnpm --filter @paperclipai/paperclip-runner exec vitest run \
diff --git a/scripts/__tests__/release-verify-workflow.test.mjs b/scripts/__tests__/release-verify-workflow.test.mjs
index 677ff0bc812..4f9c70c647b 100644
--- a/scripts/__tests__/release-verify-workflow.test.mjs
+++ b/scripts/__tests__/release-verify-workflow.test.mjs
@@ -604,6 +604,18 @@ test("release verification builds native test binaries in a required Rust-cached
   assert.doesNotMatch(cloud, /continue-on-error|always\(\)/);
 });
 
+test("chaos verification prepares native Runner binaries before fault suites", () => {
+  const workflow = readWorkflow("runner-chaos-evals.yml");
+  const steps = workflow.split(/\n(?=      - )/);
+  const install = steps.find(step => /run:\s*pnpm install\b/.test(step));
+  const prepare = steps.find(step => /run:\s*pnpm --filter @paperclipai\/paperclip-runner build:rust\b/.test(step));
+  const faults = steps.find(step => /src\/native-session-runtime\.test\.ts/.test(step));
+  assert.ok(install && prepare && faults, "the real Runner fault suite needs its native build prerequisite");
+  assert.ok(steps.indexOf(install) < steps.indexOf(prepare));
+  assert.ok(steps.indexOf(prepare) < steps.indexOf(faults));
+  assert.doesNotMatch(prepare, /^\s+(?:if|continue-on-error):/m);
+});
+
 test("Runner eval workflows pin actions and gate paid live execution", () => {
   const actionPinWorkflows = [
     readWorkflow("release-verify.yml"),