diff --git a/lua/cp/init.lua b/lua/cp/init.lua
index 74da04b..e295360 100644
--- a/lua/cp/init.lua
+++ b/lua/cp/init.lua
@@ -518,6 +518,7 @@ local function toggle_run_panel(is_debug)
     update_diff_panes()
   end
 
+  ---@param delta number 1 for next, -1 for prev
   local function navigate_test_case(delta)
     local test_state = run.get_run_panel_state()
     if #test_state.test_cases == 0 then
@@ -597,7 +598,7 @@ local function toggle_run_panel(is_debug)
   logger.log(string.format('test panel opened (%d test cases)', #test_state.test_cases))
 end
 
----@param delta number 1 for next, -1 for prev
+---@param contest_id string
 ---@param language? string
 local function setup_contest(contest_id, language)
   if not state.platform then
@@ -655,6 +656,8 @@ local function setup_contest(contest_id, language)
   return true
 end
 
+---@param delta number 1 for next, -1 for prev
+---@param language? string
 local function navigate_problem(delta, language)
   if not state.platform or not state.contest_id then
     logger.log('no contest set. run :CP <platform> <contest> first', vim.log.levels.ERROR)
diff --git a/scrapers/atcoder.py b/scrapers/atcoder.py
index 1451bc2..3dc1d16 100644
--- a/scrapers/atcoder.py
+++ b/scrapers/atcoder.py
@@ -247,7 +247,7 @@ def scrape_contests() -> list[ContestSummary]:
 
                     try:
                         name = name.encode().decode("unicode_escape")
-                    except:
+                    except (UnicodeDecodeError, UnicodeEncodeError):
                         pass
 
                     name = (
diff --git a/scrapers/cses.py b/scrapers/cses.py
index f032c7a..3018645 100755
--- a/scrapers/cses.py
+++ b/scrapers/cses.py
@@ -343,7 +343,7 @@ def main() -> None:
     if len(sys.argv) < 2:
         result = MetadataResult(
             success=False,
-            error="Usage: cses.py metadata <category_id> OR cses.py tests <problem_id_or_url> OR cses.py contests",
+            error="Usage: cses.py metadata <category_id> OR cses.py tests <category> <problem_id> OR cses.py contests",
         )
         print(json.dumps(asdict(result)))
         sys.exit(1)
@@ -374,10 +374,10 @@ def main() -> None:
         print(json.dumps(asdict(result)))
 
     elif mode == "tests":
-        if len(sys.argv) != 3:
+        if len(sys.argv) != 4:
             tests_result = TestsResult(
                 success=False,
-                error="Usage: cses.py tests <problem_id_or_url>",
+                error="Usage: cses.py tests <category> <problem_id>",
                 problem_id="",
                 url="",
                 tests=[],
@@ -387,7 +387,8 @@ def main() -> None:
             print(json.dumps(asdict(tests_result)))
             sys.exit(1)
 
-        problem_input: str = sys.argv[2]
+        category: str = sys.argv[2]
+        problem_input: str = sys.argv[3]
         url: str | None = parse_problem_url(problem_input)
 
         if not url:
@@ -475,7 +476,7 @@ def main() -> None:
     else:
         result = MetadataResult(
             success=False,
-            error=f"Unknown mode: {mode}. Use 'metadata', 'tests', or 'contests'",
+            error=f"Unknown mode: {mode}. Use 'metadata <category>', 'tests <category> <problem_id>', or 'contests'",
         )
         print(json.dumps(asdict(result)))
         sys.exit(1)