diff --git a/headroom/proxy/helpers.py b/headroom/proxy/helpers.py
index 7c8696f7e..c34ec04ed 100644
--- a/headroom/proxy/helpers.py
+++ b/headroom/proxy/helpers.py
@@ -841,9 +841,7 @@ def decide_compression_failure_action(
             frame_bytes=frame_bytes,
         )
 
-    if (client or "").strip().lower() == "codex" and isinstance(
-        exception, asyncio.TimeoutError
-    ):
+    if (client or "").strip().lower() == "codex" and isinstance(exception, asyncio.TimeoutError):
         return CompressionFailureAction(
             refuse=False,
             reason="client_override:codex",
diff --git a/headroom/transforms/code_compressor.py b/headroom/transforms/code_compressor.py
index c7ab74e98..13b4a8e31 100644
--- a/headroom/transforms/code_compressor.py
+++ b/headroom/transforms/code_compressor.py
@@ -117,7 +117,9 @@ def _get_parser(language: str) -> Any:
             from tree_sitter_language_pack import get_language
 
             parser = Parser()
-            parser.language = get_language(language)
+            # `language` is a validated runtime str; get_language types its arg
+            # as a Literal of supported names, which a dynamic str can't satisfy.
+            parser.language = get_language(language)  # type: ignore[arg-type]
             parsers[language] = parser
             logger.debug(
                 "Loaded tree-sitter parser for %s (thread %s)",
@@ -163,7 +165,9 @@ def unload_tree_sitter() -> bool:
     if parsers:
         count = len(parsers)
         parsers.clear()
-        logger.info("Unloaded %d tree-sitter parsers (thread %s)", count, threading.current_thread().name)
+        logger.info(
+            "Unloaded %d tree-sitter parsers (thread %s)", count, threading.current_thread().name
+        )
         return True
     return False
 
diff --git a/tests/repro_unsendable_panic.py b/tests/repro_unsendable_panic.py
index 100843fa9..52296899d 100644
--- a/tests/repro_unsendable_panic.py
+++ b/tests/repro_unsendable_panic.py
@@ -12,8 +12,8 @@ Usage:
     python repro_unsendable_panic.py
 """
 
-import threading
 import concurrent.futures
+import threading
 
 CODE = b"def hello():\n    return 42\n"