diff --git a/scrapers/codechef.py b/scrapers/codechef.py
index b7f4ec7..200d5e2 100644
--- a/scrapers/codechef.py
+++ b/scrapers/codechef.py
@@ -13,6 +13,7 @@ from .timeouts import HTTP_TIMEOUT
 from .models import (
     ContestListResult,
     ContestSummary,
+    LoginResult,
     MetadataResult,
     ProblemSummary,
     SubmitResult,
@@ -267,6 +268,9 @@ class CodeChefScraper(BaseScraper):
             verdict="",
         )
 
+    async def login(self, credentials: dict[str, str]) -> LoginResult:
+        return self._login_error("CodeChef login not yet implemented")
+
 
 if __name__ == "__main__":
     CodeChefScraper().run_cli()
diff --git a/scrapers/kattis.py b/scrapers/kattis.py
index 566473c..9b11395 100644
--- a/scrapers/kattis.py
+++ b/scrapers/kattis.py
@@ -14,6 +14,7 @@ from .timeouts import HTTP_TIMEOUT
 from .models import (
     ContestListResult,
     ContestSummary,
+    LoginResult,
     MetadataResult,
     ProblemSummary,
     SubmitResult,
@@ -284,6 +285,9 @@ class KattisScraper(BaseScraper):
             verdict="",
         )
 
+    async def login(self, credentials: dict[str, str]) -> LoginResult:
+        return self._login_error("Kattis login not yet implemented")
+
 
 if __name__ == "__main__":
     KattisScraper().run_cli()
diff --git a/scrapers/usaco.py b/scrapers/usaco.py
index 099f102..221811c 100644
--- a/scrapers/usaco.py
+++ b/scrapers/usaco.py
@@ -12,6 +12,7 @@ from .timeouts import HTTP_TIMEOUT
 from .models import (
     ContestListResult,
     ContestSummary,
+    LoginResult,
     MetadataResult,
     ProblemSummary,
     SubmitResult,
@@ -299,6 +300,9 @@ class USACOScraper(BaseScraper):
             verdict="",
         )
 
+    async def login(self, credentials: dict[str, str]) -> LoginResult:
+        return self._login_error("USACO login not yet implemented")
+
 
 if __name__ == "__main__":
     USACOScraper().run_cli()