diff --git a/packages/memory-host-sdk/src/host/fs-utils.ts b/packages/memory-host-sdk/src/host/fs-utils.ts
index 0842b3ed4e5..f883d864d7e 100644
--- a/packages/memory-host-sdk/src/host/fs-utils.ts
+++ b/packages/memory-host-sdk/src/host/fs-utils.ts
@@ -18,12 +18,13 @@ if (!hasPythonModeOverride) {
 
 export function isFileMissingError(
   err: unknown,
-): err is NodeJS.ErrnoException & { code: "ENOENT" } {
+): err is NodeJS.ErrnoException & { code: "ENOENT" | "ENOTDIR" | "not-found" } {
   return Boolean(
     err &&
     typeof err === "object" &&
     "code" in err &&
     ((err as Partial<NodeJS.ErrnoException>).code === "ENOENT" ||
+      (err as Partial<NodeJS.ErrnoException>).code === "ENOTDIR" ||
       (err as { code?: unknown }).code === "not-found"),
   );
 }
diff --git a/packages/memory-host-sdk/src/host/read-file.test.ts b/packages/memory-host-sdk/src/host/read-file.test.ts
index 802a757e632..abb4c594141 100644
--- a/packages/memory-host-sdk/src/host/read-file.test.ts
+++ b/packages/memory-host-sdk/src/host/read-file.test.ts
@@ -37,6 +37,19 @@ describe("readMemoryFile", () => {
         text: "",
         path: path.relative(workspaceDir, missingPath).replace(/\\/g, "/"),
       });
+
+      const nonDirectoryParentPath = path.join(extraDir, "note.md", "child.md");
+      await fs.writeFile(path.join(extraDir, "note.md"), "note", "utf-8");
+      await expect(
+        readMemoryFile({
+          workspaceDir,
+          extraPaths: [extraDir],
+          relPath: nonDirectoryParentPath,
+        }),
+      ).resolves.toEqual({
+        text: "",
+        path: path.relative(workspaceDir, nonDirectoryParentPath).replace(/\\/g, "/"),
+      });
     } finally {
       await fs.rm(tmpRoot, { recursive: true, force: true });
     }