From 9742422643d1ee0965df0729732066eb417637b2 Mon Sep 17 00:00:00 2001
From: jujumilk3 <jujumilk3@gmail.com>
Date: Tue, 21 Apr 2026 18:50:13 +0900
Subject: [PATCH] fix(deps): require mcp>=1.19 for CallToolResult passthrough

Since #717, create_sdk_mcp_server() returns a CallToolResult from its
@server.call_tool() handler. The mcp low-level server only has the
isinstance(results, CallToolResult) passthrough branch starting at
mcp==1.19.0. On mcp<=1.18.x, CallToolResult (a pydantic BaseModel) falls
into the iterable branch, yielding (field, value) tuples that fail
ContentBlock union validation with 20 errors (4 fields x 5 union members).

Bump the minimum mcp constraint so every install has the passthrough
branch #717 relies on.

Refs #717
---
 pyproject.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pyproject.toml b/pyproject.toml
index 6c001ff9..b1ec77d9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ keywords = ["claude", "ai", "sdk", "anthropic"]
 dependencies = [
     "anyio>=4.0.0",
     "typing_extensions>=4.0.0; python_version<'3.11'",
-    "mcp>=0.1.0",
+    "mcp>=1.19.0",
 ]
 
 [project.optional-dependencies]