feat: init pydantic ai agent & context 7 mcp (#1240)

* feat: init pydantic ai agent & context 7 mcp

* feat: integrate MCP documentation search into data science pipeline evaluation

* fix: disable MCP documentation search and update related docstrings and defaults

* lint

* fix: correct prompt formatting and conditional blocks in pipeline_eval section

* lint

* feat: add query method to PAIAgent for synchronous agent execution

* fix: apply nest_asyncio for agent and update context7 query method

* lint

* lint

* lint

* lint

* docs: update MCP folder docstring and rename test class in test_pydantic.py

* refactor: centralize completion kwargs logic and update pydantic_ai integration

* fixbug

* typo

* fix: bug triggered by padantic-ai version backtracking.

---------

Co-authored-by: Linlang <Lv.Linlang@hotmail.com>

rdagent/app/data_science/conf.py

@@ -47,6 +47,10 @@ class DataScienceBasePropSetting(KaggleBasePropSetting):
     enable_doc_dev: bool = False
     model_dump_check_level: Literal["medium", "high"] = "medium"
 
+    #### MCP documentation search integration
+    enable_mcp_documentation_search: bool = False
+    """Enable MCP documentation search for error resolution. Requires MCP_ENABLED=true and MCP_CONTEXT7_ENABLED=true in environment."""
+
     ### specific feature
 
     ### notebook integration
@@ -181,7 +185,7 @@ class DataScienceBasePropSetting(KaggleBasePropSetting):
 
 DS_RD_SETTING = DataScienceBasePropSetting()
 
-# enable_cross_trace_diversity 和 llm_select_hypothesis should not be true at the same time
+# enable_cross_trace_diversity and llm_select_hypothesis should not be true at the same time
 assert not (
     DS_RD_SETTING.enable_cross_trace_diversity and DS_RD_SETTING.llm_select_hypothesis
 ), "enable_cross_trace_diversity and llm_select_hypothesis cannot be true at the same time"