fix(mcp): keep built-in servers on SDK v1 (#5820)

tests/test_mcp_dependency_compatibility.py

@@ -0,0 +1,15 @@
+"""Regression coverage for the built-in MCP servers' SDK compatibility line."""
+
+from pathlib import Path
+
+
+REQUIREMENTS = Path(__file__).resolve().parents[1] / "requirements.txt"
+
+
+def test_mcp_requirement_excludes_breaking_v2_sdk():
+    requirements = [
+        line.split("#", 1)[0].strip().replace(" ", "")
+        for line in REQUIREMENTS.read_text(encoding="utf-8").splitlines()
+    ]
+
+    assert "mcp<2" in requirements