docs: add snippet verification for docs/ pages (#2115)

examples/snippets/servers/tool_change_notifications.py

@@ -0,0 +1,15 @@
+from mcp.server.fastmcp import Context, FastMCP
+from mcp.server.session import ServerSession
+
+mcp = FastMCP("Dynamic Tools")
+
+
+@mcp.tool()
+async def register_plugin(name: str, ctx: Context[ServerSession, None]) -> str:
+    """Dynamically register a new tool and notify the client."""
+    # ... register the plugin's tools ...
+
+    # Notify the client that the tool list has changed
+    await ctx.session.send_tool_list_changed()
+
+    return f"Plugin '{name}' registered"