diff --git a/server/audit.ts b/server/audit.ts
index 0af21af..73cd4ab 100644
--- a/server/audit.ts
+++ b/server/audit.ts
@@ -43,7 +43,8 @@ export let auditLog = function auditLog(
       }, ${ipAddress}, ${leafHashHex})
       `;
     } catch (error: any) {
-      console.error("[Audit Logger] Failed to insert audit record:", error);
+      const msg = error?.code || error?.message || String(error);
+      console.error(`[Audit Logger] Failed to insert audit record: ${msg}`);
     }
   })();
 };
diff --git a/server/tests/auth.test.ts b/server/tests/auth.test.ts
index 65540b1..873077f 100644
--- a/server/tests/auth.test.ts
+++ b/server/tests/auth.test.ts
@@ -7,6 +7,7 @@ import { auditWrapper } from "../audit.ts";
 import { rateLimitWrapper } from "../ratelimit.ts";
 
 const originalSql = sqlWrapper.sql;
+const originalAudit = auditWrapper.auditLog;
 
 function setMockSql(mockImpl: () => Promise<any>) {
   sqlWrapper.sql = mockImpl as any;
@@ -36,7 +37,6 @@ Deno.test("Phase 4: Audit Ledger Verification - Login failed", async () => {
   });
 
   let auditArgs: any[] = [];
-  const originalAudit = auditWrapper.auditLog;
   auditWrapper.auditLog = (...args: any[]) => {
     auditArgs = args;
   };
@@ -57,7 +57,6 @@ Deno.test("Phase 4: Audit Ledger Verification - Login failed", async () => {
   assertEquals(auditArgs[1], "login_failed");
 
   restoreMockSql();
-  auditWrapper.auditLog = originalAudit;
 });
 
 Deno.test("WebAuthn - /api/register/verify extracts PRF", async () => {
@@ -397,6 +396,7 @@ Deno.test("Ephemeral 1-Click Magic Link Redemption (/pass)", async (t) => {
       } finally {
         valkeyGetStub.restore();
         valkeyTtlStub.restore();
+        auditWrapper.auditLog = originalAudit;
       }
     },
   );
diff --git a/server/tests/scopes.test.ts b/server/tests/scopes.test.ts
index caa01a0..4b7031e 100644
--- a/server/tests/scopes.test.ts
+++ b/server/tests/scopes.test.ts
@@ -4,8 +4,13 @@ import { app } from "../main.ts";
 import { sqlWrapper } from "../db.ts";
 import { valkey } from "../valkey.ts";
 import { rateLimitWrapper } from "../ratelimit.ts";
+import { auditWrapper } from "../audit.ts";
 
 const originalSql = sqlWrapper.sql;
+const originalAudit = auditWrapper.auditLog;
+const auditEvents: Array<
+  { action: string; resource?: string | null; details?: any }
+> = [];
 
 function setMockSql(mockImpl: () => Promise<any>) {
   sqlWrapper.sql = mockImpl as any;
@@ -16,6 +21,14 @@ function restoreMockSql() {
 }
 
 rateLimitWrapper.checkRateLimit = () => Promise.resolve(true);
+auditWrapper.auditLog = (
+  _userId: string | null,
+  action: string,
+  resource: string | null,
+  details: Record<string, unknown> | null,
+) => {
+  auditEvents.push({ action, resource, details });
+};
 
 Deno.test("Zero-Trust Scope Guards", async (t) => {
   const mockUserId = "user-id-guards";
@@ -385,6 +398,7 @@ Deno.test("Agent Session Delegation & Scoped Permissions", async (t) => {
         const json = await res.json();
         assert(json.success === true);
         assert(json.newExpiresAt);
+        assert(auditEvents.some((e) => e.action === "session_extended"));
       } finally {
         sqlWrapper.sql = originalSql;
         valkeyStub.restore();
@@ -392,4 +406,10 @@ Deno.test("Agent Session Delegation & Scoped Permissions", async (t) => {
       }
     },
   );
+
+  // Verify full audit coverage across delegation endpoints
+  assert(auditEvents.some((e) => e.action === "session_delegated"));
+  assert(auditEvents.some((e) => e.action === "session_scopes_updated"));
+
+  auditWrapper.auditLog = originalAudit;
 });