From 91490aa641f0c3a7449a8838104ac77514a403d6 Mon Sep 17 00:00:00 2001
From: nightcityblade <nightcityblade@gmail.com>
Date: Fri, 15 May 2026 11:28:42 +0800
Subject: [PATCH] fix: copy mutable file tuple containers

Fixes anthropics/anthropic-sdk-python#1202
---
 src/anthropic/_files.py | 14 ++++++++++++++
 tests/test_files.py     | 13 +++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/src/anthropic/_files.py b/src/anthropic/_files.py
index 42cfbeb99..ba817bebd 100644
--- a/src/anthropic/_files.py
+++ b/src/anthropic/_files.py
@@ -170,4 +170,18 @@ def _deepcopy_with_paths(item: _T, paths: Sequence[Sequence[str]], index: int) -
         if not array_paths:
             return cast(_T, item)
         return cast(_T, [_deepcopy_with_paths(entry, array_paths, index + 1) for entry in item])
+    if is_tuple_t(item):
+        tuple_item = cast(tuple[object, ...], item)
+        return cast(_T, _copy_file_container(tuple_item))
+    return item
+
+
+def _copy_file_container(item: object) -> object:
+    if is_mapping(item):
+        return {key: _copy_file_container(value) for key, value in item.items()}
+    if is_list(item):
+        return [_copy_file_container(entry) for entry in item]
+    if is_tuple_t(item):
+        entries = cast(tuple[object, ...], item)
+        return tuple(_copy_file_container(entry) for entry in entries)
     return item
diff --git a/tests/test_files.py b/tests/test_files.py
index cbef775f2..a9e9ebce4 100644
--- a/tests/test_files.py
+++ b/tests/test_files.py
@@ -91,6 +91,19 @@ def test_nested_array_path_copies_list_and_elements(self) -> None:
         assert_different_identities(result_items[0], elem1)
         assert_different_identities(result_items[1], elem2)
 
+    def test_copies_mutable_file_tuple_entries(self) -> None:
+        headers = {"x-test": "value"}
+        file = ("example.txt", b"contents", "text/plain", headers)
+        original = {"file": file}
+
+        result = deepcopy_with_paths(original, [["file"]])
+
+        assert_different_identities(result, original)
+        result_file = result["file"]
+        assert_different_identities(result_file, file)
+        assert result_file[:3] == file[:3]
+        assert_different_identities(result_file[3], headers)
+
     def test_empty_paths_returns_same_object(self) -> None:
         original = {"foo": "bar"}
         result = deepcopy_with_paths(original, [])