React to lmTools API breaking changes (#12866)

Author: benmcmorran

Extension/package.json

@@ -6451,10 +6451,7 @@
                 "userDescription": "%c_cpp.languageModelTools.configuration.userDescription%",
                 "modelDescription": "For the active C or C++ file, this tool provides: the language (C, C++, or CUDA), the language standard version (such as C++11, C++14, C++17, or C++20), the compiler (such as GCC, Clang, or MSVC), the target platform (such as x86, x64, or ARM), and the target architecture (such as 32-bit or 64-bit).",
                 "icon": "$(file-code)",
-                "when": "(config.C_Cpp.experimentalFeatures =~ /^[eE]nabled$/)",
-                "supportedContentTypes": [
-                    "text/plain"
-                ]
+                "when": "(config.C_Cpp.experimentalFeatures =~ /^[eE]nabled$/)"
             }
         ]
     },

Extension/src/LanguageServer/lmTool.ts

@@ -44,15 +44,10 @@ const knownValues: { [Property in keyof ChatContextResult]?: { [id: string]: str
     }
 };
 
-const plainTextContentType = 'text/plain';
-
 export class CppConfigurationLanguageModelTool implements vscode.LanguageModelTool<void> {
     public async invoke(options: vscode.LanguageModelToolInvocationOptions<void>, token: vscode.CancellationToken): Promise<vscode.LanguageModelToolResult> {
-        const result: vscode.LanguageModelToolResult = {};
-        if (options.requestedContentTypes.includes(plainTextContentType)) {
-            result[plainTextContentType] = await this.getContext(token);
-        }
-        return result;
+        return new vscode.LanguageModelToolResult([
+            new vscode.LanguageModelTextPart(await this.getContext(token))]);
     }
 
     private async getContext(token: vscode.CancellationToken): Promise<string> {