From d11cb9ac740f14a80385ef930012d238e811cb40 Mon Sep 17 00:00:00 2001
From: "2285166171@qq.com" <2285166171@qq.com>
Date: Fri, 20 Mar 2026 10:24:09 +0800
Subject: [PATCH] fix(utils): recursively copy tuples in deepcopy_minimal to
 prevent in-place mutation

deepcopy_minimal only handled dicts and lists, so tuples containing
mutable objects (like dicts) were returned as-is. When files.beta.upload
receives a FileTypes tuple like (filename, content, mime, headers_dict),
the headers dict inside the tuple could be mutated in place and returned
to the caller changed.

Add tuple support so mutable elements inside tuples are properly copied.

Fixes #1202
---
 src/anthropic/_utils/_utils.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/anthropic/_utils/_utils.py b/src/anthropic/_utils/_utils.py
index eec7f4a1..4e581694 100644
--- a/src/anthropic/_utils/_utils.py
+++ b/src/anthropic/_utils/_utils.py
@@ -181,6 +181,7 @@ def deepcopy_minimal(item: _T) -> _T:
 
     - mappings, e.g. `dict`
     - list
+    - tuple (recursively copies elements so mutable items inside are not shared)
 
     This is done for performance reasons.
     """
@@ -188,6 +189,8 @@ def deepcopy_minimal(item: _T) -> _T:
         return cast(_T, {k: deepcopy_minimal(v) for k, v in item.items()})
     if is_list(item):
         return cast(_T, [deepcopy_minimal(entry) for entry in item])
+    if isinstance(item, tuple):
+        return cast(_T, tuple(deepcopy_minimal(entry) for entry in item))
     return item