Support CrewAI Optional inputs

The current implementation of the CrewAI adapter doesn't cover the
scenario where the argument is optional. This change fixes that and
provides an assertion to validate what is received by the MCP echo
server.

Author: electrocucaracha

src/echo.py

@@ -10,16 +10,20 @@
 
 
 @mcp.tool()
-def echo_tool(text: str = Field(description="The text to echo")) -> str:
+def echo_tool(
+    id: int | float | None,
+    text: str = Field(description="The text to echo"),
+) -> str:
     """Echo the input text
 
     Args:
+        id (int|float|None): (Optional) Id
         text (str): The text to echo
 
     Returns:
         str: The echoed text
     """
-    return text
+    return f"echo_tool({id},{text})"
 
 
 @mcp.resource("echo://static")

src/mcpadapt/crewai_adapter.py

@@ -67,9 +67,8 @@ def _run(self, *args: Any, **kwargs: Any) -> Any:
                 filtered_kwargs: dict[str, Any] = {}
                 schema_properties = mcp_tool.inputSchema.get("properties", {})
 
-                for key, value in kwargs.items():
-                    if value is None and key in schema_properties:
-                        prop_schema = schema_properties[key]
+                for key, prop_schema in schema_properties.items():
+                    if not key in kwargs:
                         # Check if the property allows null
                         # Simple check: if type is a list containing "null" or anyOf includes null
                         if isinstance(prop_schema.get("type"), list):
@@ -81,10 +80,10 @@ def _run(self, *args: Any, **kwargs: Any) -> Any:
                                 opt.get("type") == "null"
                                 for opt in prop_schema["anyOf"]
                             ):
-                                filtered_kwargs[key] = value
+                                filtered_kwargs[key] = prop_schema.get("default", None)
                         # If neither case allows null, skip the None value
                     else:
-                        filtered_kwargs[key] = value
+                        filtered_kwargs[key] = kwargs[key]
 
                 return func(filtered_kwargs).content[0].text  # type: ignore
 
@@ -118,4 +117,4 @@ async def async_adapt(
         CrewAIAdapter(),
     ) as tools:
         print(tools)
-        print(tools[0].run(text="hello"))
+        assert tools[0].run(text="hello") == "echo_tool(None,hello)"