LLM agents frequently serialize list/dict tool arguments as JSON strings
instead of native types (e.g., tags='["a","b"]' instead of tags=["a","b"]),
causing Pydantic validation failures. This extends _make_tools_tolerant to
detect array/object parameters from the JSON Schema and auto-coerce string
values via json.loads before validation.
Also fixes _make_tools_tolerant compatibility with FastMCP 3.x by adding
a _get_mcp_tools helper that supports both 2.x and 3.x internal APIs.
