diff --git a/tests/acceptance/analysisSnapshotDiagnostics.test.ts b/tests/acceptance/analysisSnapshotDiagnostics.test.ts
index 1c24529239..b81bc38ca7 100644
--- a/tests/acceptance/analysisSnapshotDiagnostics.test.ts
+++ b/tests/acceptance/analysisSnapshotDiagnostics.test.ts
@@ -59,6 +59,10 @@ cliTest(
         });
         expect(error).not.toHaveProperty("cause");
         expect(error).not.toHaveProperty("stack");
+        if (field === "target")
+          expect(error.details?.reason).toBe(
+            "Analysis snapshot validation failed at target: Invalid input: expected object, received undefined (2 more issues)",
+          );
       }
       expect(mcpError.details).toEqual(cliError.details);
       expect(await readFile(snapshot, "utf8")).toBe(encoded);
diff --git a/tests/boundary/filesystem/analysisSnapshotInput.test.ts b/tests/boundary/filesystem/analysisSnapshotInput.test.ts
index 0b5ca523f5..6f67fbf01d 100644
--- a/tests/boundary/filesystem/analysisSnapshotInput.test.ts
+++ b/tests/boundary/filesystem/analysisSnapshotInput.test.ts
@@ -59,6 +59,10 @@ describe.each([
         retryable: false,
         details: { reason: expect.stringContaining(`at ${field}:`) },
       });
+      if (field === "target")
+        expect(projected.details?.reason).toBe(
+          "Analysis snapshot validation failed at target: Invalid input: expected object, received undefined (2 more issues)",
+        );
       expect(projected).not.toHaveProperty("cause");
       expect(projected).not.toHaveProperty("stack");
       expect(await readFile(path, "utf8")).toBe(encoded);