diff --git a/lib/analysis.js b/lib/analysis.js
index cb851ba..5f36965 100644
--- a/lib/analysis.js
+++ b/lib/analysis.js
@@ -100,6 +100,7 @@ export async function analyseScenario(scenario, opts = {}) {
       "500",
       e.providerApiPath,
       e.providerExecution,
+      e.code,
     );
   }
 
@@ -175,7 +176,7 @@ function tryValidateAgainstSchema(data, schema) {
 
 // ── Result builders ──────────────────────────────────
 
-function buildErrorResponse(message, elapsed, statusCode = 500, providerApiPath, providerExecution) {
+function buildErrorResponse(message, elapsed, statusCode = 500, providerApiPath, providerExecution, code) {
   return {
     success: false,
     error: message,
@@ -187,6 +188,7 @@ function buildErrorResponse(message, elapsed, statusCode = 500, providerApiPath,
     statusCode,
     providerApiPath,
     providerExecution,
+    code,
   };
 }
 
diff --git a/lib/graph/orchestrator.js b/lib/graph/orchestrator.js
index cf42b88..86cf066 100644
--- a/lib/graph/orchestrator.js
+++ b/lib/graph/orchestrator.js
@@ -382,6 +382,7 @@ export async function startCase(body, dependencies = {}) {
       providerApiPath: analysis.providerApiPath ?? undefined,
       providerExecution: analysis.providerExecution ?? undefined,
       rawResponse: analysis.rawResponse ?? undefined,
+      code: analysis.code ?? undefined,
       statusCode: Number(analysis.statusCode) || 502,
     };
   }
diff --git a/tests/app/api/cases-start-route.test.js b/tests/app/api/cases-start-route.test.js
index d36afca..c1f9230 100644
--- a/tests/app/api/cases-start-route.test.js
+++ b/tests/app/api/cases-start-route.test.js
@@ -1,13 +1,20 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 
 const mockStartCase = vi.fn();
+let realStartCase;
 let warnSpy;
 let errorSpy;
 
-vi.mock("@/lib/graph/orchestrator.js", () => ({
-  startCase: (...args) => mockStartCase(...args),
+vi.mock("@/lib/config.js", () => ({
+  getConfig: () => ({ ok: true }),
 }));
 
+vi.mock("@/lib/graph/orchestrator.js", async (importOriginal) => {
+  const actual = await importOriginal();
+  realStartCase = actual.startCase;
+  return { ...actual, startCase: (...args) => mockStartCase(...args) };
+});
+
 vi.mock("@/lib/supabase/api-auth.js", () => ({
   withAuthenticatedApi: (handler) => handler,
 }));
@@ -128,13 +135,21 @@ describe("app/api/cases/start route", () => {
   });
 
   it("returns a sanitized 503 when the provider is unavailable", async () => {
-    mockStartCase.mockResolvedValue({
-      success: false,
-      code: "PROVIDER_UNAVAILABLE",
-      error: "Ollama /api/generate request timed out after 5 minutes",
-      providerApiPath: "/api/generate",
-      providerExecution: { generateRequestAttempted: true },
-    });
+    const unavailableError = Object.assign(
+      new Error("Ollama /api/generate request timed out after 5 minutes"),
+      {
+        code: "PROVIDER_UNAVAILABLE",
+        providerApiPath: "/api/generate",
+        providerExecution: { generateRequestAttempted: true },
+      },
+    );
+    const reconstructionProvider = {
+      generateReconstruction: vi.fn().mockRejectedValue(unavailableError),
+    };
+    mockStartCase.mockImplementation((body) => realStartCase(body, {
+      reconstructionProvider,
+      reconstructionModelName: "configured-model",
+    }));
 
     const { POST } = await import("@/app/api/cases/start/route.js");
     const response = await POST(