From 54c74050839fb5042e3799a4407c90b469014e0e Mon Sep 17 00:00:00 2001
From: Daniel Cherubini <daniel@cherubini.casa>
Date: Mon, 14 Sep 2026 19:00:20 +0200
Subject: [PATCH] fix: clear type-discipline gate breaches (LIT001 +3, LIT009
 +3)
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LIT009: the PR's three # type: ignore on chunk.choices / response.choices
were dead (enableTypeIgnoreComments is false), and LIT009 is frozen at
limit 0. Removed them and widened the three receiving signatures to
Sequence[... | Choices] so the list/Choices/StreamingChoices call sites
assign cleanly by covariance.

LIT001: the +3 came from the new code's mutable-collection annotations
(classifier choices list, new accumulator helper choices list, and the
_is_thinking_disabled dict param) — switched to Sequence / Mapping
read-only views.
---
 .../experimental_pass_through/adapters/handler.py      |  2 +-
 .../adapters/streaming_iterator.py                     |  4 ++--
 .../adapters/transformation.py                         | 10 +++++-----
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/litellm/llms/anthropic/experimental_pass_through/adapters/handler.py b/litellm/llms/anthropic/experimental_pass_through/adapters/handler.py
index 87bb3c4ed25..06446de1ff1 100644
--- a/litellm/llms/anthropic/experimental_pass_through/adapters/handler.py
+++ b/litellm/llms/anthropic/experimental_pass_through/adapters/handler.py
@@ -319,7 +319,7 @@ ANTHROPIC_ADAPTER: Final = AnthropicAdapter()
 
 class LiteLLMMessagesToCompletionTransformationHandler:
     @staticmethod
-    def _is_thinking_disabled(thinking: dict | None) -> bool:
+    def _is_thinking_disabled(thinking: Mapping | None) -> bool:
         """Return True when the client's thinking param is absent or explicitly disabled."""
         return thinking is None or (isinstance(thinking, dict) and thinking.get("type") == "disabled")
 
diff --git a/litellm/llms/anthropic/experimental_pass_through/adapters/streaming_iterator.py b/litellm/llms/anthropic/experimental_pass_through/adapters/streaming_iterator.py
index 2efa9157575..0c77fd495e8 100644
--- a/litellm/llms/anthropic/experimental_pass_through/adapters/streaming_iterator.py
+++ b/litellm/llms/anthropic/experimental_pass_through/adapters/streaming_iterator.py
@@ -1169,7 +1169,7 @@ class AnthropicStreamWrapper(AdapterCompletionStreamWrapper):
 
         return (
             LiteLLMAnthropicMessagesAdapter._classify_streaming_chunk(
-                choices=chunk.choices,  # type: ignore
+                choices=chunk.choices,
                 thinking_disabled=thinking_disabled,
             )
             != "skip"
@@ -1232,7 +1232,7 @@ class AnthropicStreamWrapper(AdapterCompletionStreamWrapper):
             block_type,
             content_block_start,
         ) = LiteLLMAnthropicMessagesAdapter()._translate_streaming_openai_chunk_to_anthropic_content_block(
-            choices=chunk.choices,  # type: ignore
+            choices=chunk.choices,
             thinking_disabled=self.thinking_disabled,
         )
 
diff --git a/litellm/llms/anthropic/experimental_pass_through/adapters/transformation.py b/litellm/llms/anthropic/experimental_pass_through/adapters/transformation.py
index 546ae55ec29..2bc925c6c83 100644
--- a/litellm/llms/anthropic/experimental_pass_through/adapters/transformation.py
+++ b/litellm/llms/anthropic/experimental_pass_through/adapters/transformation.py
@@ -1562,7 +1562,7 @@ class LiteLLMAnthropicMessagesAdapter:
 
     @staticmethod
     def _classify_streaming_chunk(
-        choices: list["OpenAIStreamingChoice | StreamingChoices"],
+        choices: Sequence["OpenAIStreamingChoice | StreamingChoices"],
         thinking_disabled: bool = False,
     ) -> Literal["thinking", "redacted_thinking", "tool_use", "text", "skip"]:
         """
@@ -1667,7 +1667,7 @@ class LiteLLMAnthropicMessagesAdapter:
 
     def _translate_streaming_openai_chunk_to_anthropic_content_block(
         self,
-        choices: list[OpenAIStreamingChoice | StreamingChoices],
+        choices: Sequence["OpenAIStreamingChoice | StreamingChoices | Choices"],
         thinking_disabled: bool = False,
     ) -> tuple[
         Literal["text", "tool_use", "thinking", "redacted_thinking"],
@@ -1732,7 +1732,7 @@ class LiteLLMAnthropicMessagesAdapter:
 
     def _translate_streaming_openai_chunk_to_anthropic(
         self,
-        choices: list[OpenAIStreamingChoice | StreamingChoices],
+        choices: Sequence["OpenAIStreamingChoice | StreamingChoices | Choices"],
         thinking_disabled: bool = False,
     ) -> tuple[
         StreamingContentBlockDeltaType,
@@ -1757,7 +1757,7 @@ class LiteLLMAnthropicMessagesAdapter:
 
     def _accumulate_streaming_chunk_payloads(
         self,
-        choices: list[OpenAIStreamingChoice | StreamingChoices],
+        choices: Sequence["OpenAIStreamingChoice | StreamingChoices"],
         thinking_disabled: bool = False,
     ) -> tuple[str, str, str, str | None]:
         """Fold a chunk's choices into (text, reasoning_content, reasoning_signature, partial_json).
@@ -1838,7 +1838,7 @@ class LiteLLMAnthropicMessagesAdapter:
             type_of_content,
             content_block_delta,
         ) = self._translate_streaming_openai_chunk_to_anthropic(
-            choices=response.choices,  # type: ignore
+            choices=response.choices,
             thinking_disabled=thinking_disabled,
         )
         return ContentBlockDelta(