diff --git a/src/gateway/server-methods/agents-mutate.test.ts b/src/gateway/server-methods/agents-mutate.test.ts
index df11219d612..d62d1d4a9cf 100644
--- a/src/gateway/server-methods/agents-mutate.test.ts
+++ b/src/gateway/server-methods/agents-mutate.test.ts
@@ -415,7 +415,7 @@ describe("agents.create", () => {
 
   it("does not persist config when IDENTITY.md append is rejected after preflight", async () => {
     mocks.appendFileWithinRoot.mockRejectedValueOnce(
-      new SafeOpenError("path escapes workspace root", "path escapes workspace root"),
+      new SafeOpenError("path-mismatch", "path escapes workspace root"),
     );
 
     const { respond, promise } = makeCall("agents.create", {