diff --git a/src/config/config.schema-regressions.test.ts b/src/config/config.schema-regressions.test.ts
index c7738ba6e35..653cf04c538 100644
--- a/src/config/config.schema-regressions.test.ts
+++ b/src/config/config.schema-regressions.test.ts
@@ -145,6 +145,19 @@ describe("config schema regressions", () => {
     expect(res.ok).toBe(true);
   });
 
+  it("accepts agents.defaults.compaction.truncateAfterCompaction", () => {
+    const res = validateConfigObject({
+      agents: {
+        defaults: {
+          compaction: {
+            truncateAfterCompaction: true,
+          },
+        },
+      },
+    });
+
+    expect(res.ok).toBe(true);
+  });
   it("accepts string values for agents defaults model inputs", () => {
     const res = validateConfigObject({
       agents: {