Add type descriptions to InputSchema, and adjust format to current

specification
This allows tools like mcpInspector to list the tools

Author: below

README.md

@@ -433,19 +433,27 @@ await server.withMethodHandler(ListTools.self) { _ in
         Tool(
             name: "weather",
             description: "Get current weather for a location",
-            inputSchema: .object([
+            inputSchema`: .object([
+                "type": .string("object"),
                 "properties": .object([
-                    "location": .string("City name or coordinates"),
-                    "units": .string("Units of measurement, e.g., metric, imperial")
+                    "location": .object([
+                        "description": .string("City name or coordinates"),
+                        "type": .string("string"),
+                        "units": .string("Units of measurement, e.g., metric, imperial")
+                    ])
                 ])
             ])
         ),
         Tool(
             name: "calculator",
             description: "Perform calculations",
             inputSchema: .object([
+                "type": .string("object"),
                 "properties": .object([
-                    "expression": .string("Mathematical expression to evaluate")
+                    "expression": .object([
+                        "type": .string("string"),
+                        "description": .string("Mathematical expression to evaluate")
+                    ])
                 ])
             ])
         )
@@ -886,4 +894,4 @@ see the [GitHub Releases page](https://github.com/modelcontextprotocol/swift-sdk
 This project is licensed under the MIT License.
 
 [mcp]: https://modelcontextprotocol.io
-[mcp-spec-2025-03-26]: https://modelcontextprotocol.io/specification/2025-03-26
+[mcp-spec-2025-03-26]: https://modelcontextprotocol.io/specification/2025-03-26