From 009b9fa2a59c1bf90b50e1c554b893eeadf2dc4a Mon Sep 17 00:00:00 2001
From: AlonSoko <25619863+AlonSoko@users.noreply.github.com>
Date: Wed, 21 Oct 2026 22:01:47 +0300
Subject: [PATCH] fix(context_management): take read-only types in the system
 prompt count

The type-discipline gate (LIT001) rejects new list and dict annotations.
---
 .../context_management/editors/clear_tool_uses.py         | 8 ++++----
 .../pass_through/context_management/editors/compact.py    | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/litellm/llms/anthropic/pass_through/context_management/editors/clear_tool_uses.py b/litellm/llms/anthropic/pass_through/context_management/editors/clear_tool_uses.py
index 929655835c2..495bd659c4f 100644
--- a/litellm/llms/anthropic/pass_through/context_management/editors/clear_tool_uses.py
+++ b/litellm/llms/anthropic/pass_through/context_management/editors/clear_tool_uses.py
@@ -197,11 +197,11 @@ def _select_in_batches(candidates: Sequence[str], tokens: Mapping[str, int], cle
 
 
 def _with_system(
-    messages: list[dict[str, object]], system: str | list[dict[str, object]] | None
-) -> list[dict[str, object]]:
+    messages: Sequence[Mapping[str, object]], system: str | Sequence[Mapping[str, object]] | None
+) -> Sequence[Mapping[str, object]]:
     """The messages to count: like the API, an ``input_tokens`` trigger counts the system prompt too."""
     system_text: Final = system_to_text(system)
-    return [{"role": "system", "content": system_text}, *messages] if system_text else messages
+    return ({"role": "system", "content": system_text}, *messages) if system_text else messages
 
 
 def _trigger_met(
@@ -209,7 +209,7 @@ def _trigger_met(
     model: str,
     messages: list[dict[str, object]],
     tools: list[dict[str, object]] | None,
-    system: str | list[dict[str, object]] | None,
+    system: str | Sequence[Mapping[str, object]] | None,
     counted_tool_uses: int,
 ) -> tuple[bool, int | None]:
     """Return (trigger_met, input_tokens if counted for reuse)."""
diff --git a/litellm/llms/anthropic/pass_through/context_management/editors/compact.py b/litellm/llms/anthropic/pass_through/context_management/editors/compact.py
index 1a67c28818e..5b9be56f4f8 100644
--- a/litellm/llms/anthropic/pass_through/context_management/editors/compact.py
+++ b/litellm/llms/anthropic/pass_through/context_management/editors/compact.py
@@ -327,7 +327,7 @@ def _count_effective_tokens(
 
 
 def system_to_text(
-    system: str | list[dict[str, object]] | None,
+    system: str | Sequence[Mapping[str, object]] | None,
 ) -> str:
     """Flatten an Anthropic-style ``system`` value into a single string for
     token counting. Returns ``""`` when ``system`` carries no text."""