feat: add example and test for parameter descriptions in FastMCP tools

examples/fastmcp/parameter_descriptions.py

@@ -0,0 +1,21 @@
+"""
+FastMCP Example showing parameter descriptions
+"""
+
+from pydantic import Field
+
+from mcp.server.fastmcp import FastMCP
+
+# Create server
+mcp = FastMCP("Parameter Descriptions Server")
+
+
+@mcp.tool()
+def greet_user(
+    name: str = Field(description="The name of the person to greet"),
+    title: str = Field(description="Optional title like Mr/Ms/Dr", default=""),
+    times: int = Field(description="Number of times to repeat the greeting", default=1),
+) -> str:
+    """Greet a user with optional title and repetition"""
+    greeting = f"Hello {title + ' ' if title else ''}{name}!"
+    return "\n".join([greeting] * times)