Vertex AI MCP Server

Instructions

Implementation Reference

• src/index.ts:475-481 (handler)

  Handler for get_directory_tree tool: parses arguments using schema, validates path, builds directory tree recursively, and returns JSON string.

  case "get_directory_tree": {
      const parsed = DirectoryTreeArgsSchema.parse(args);
      const validPath = validateWorkspacePath(parsed.path);
      const treeData = await buildDirectoryTree(validPath);
      resultText = JSON.stringify(treeData, null, 2);
      break;
  }

• src/index.ts:203-235 (helper)

  Recursive helper function to build the directory tree structure as JSON-compatible TreeEntry objects.

  async function buildDirectoryTree(currentPath: string): Promise<TreeEntry[]> {
      const entries = await fs.readdir(currentPath, {withFileTypes: true});
      const result: TreeEntry[] = [];
  
      for (const entry of entries) {
          const entryData: TreeEntry = {
              name: entry.name,
              type: entry.isDirectory() ? 'directory' : 'file'
          };
  
          if (entry.isDirectory()) {
              const subPath = path.join(currentPath, entry.name);
               try {
                  const realPath = await fs.realpath(subPath);
                  if (realPath.startsWith(path.dirname(currentPath))) {
                      entryData.children = await buildDirectoryTree(subPath);
                  } else {
                       entryData.children = [];
                  }
              } catch (e) {
                   entryData.children = [];
                   console.error(`Skipping tree build in ${subPath}: ${(e as Error).message}`);
              }
          }
          result.push(entryData);
      }
      result.sort((a, b) => {
          if (a.type === 'directory' && b.type === 'file') return -1;
          if (a.type === 'file' && b.type === 'directory') return 1;
          return a.name.localeCompare(b.name);
      });
      return result;
  }

• src/tools/directory_tree.ts:7-9 (schema)

  Zod schema for input arguments: requires a 'path' string.

  export const DirectoryTreeArgsSchema = z.object({
    path: z.string().describe("The root path for the directory tree (relative to the workspace directory)."),
  });

• src/tools/directory_tree.ts:14-37 (registration)

  ToolDefinition object defining name, description, inputSchema, and buildPrompt for registration.

  export const directoryTreeTool: ToolDefinition = {
      name: "get_directory_tree", // Renamed slightly
      description:
        "Get a recursive tree view of files and directories within the workspace filesystem as a JSON structure. " +
        "Each entry includes 'name', 'type' (file/directory), and 'children' (an array) for directories. " +
        "Files have no 'children' array. The output is formatted JSON text. " +
        "Useful for understanding the complete structure of a project directory.",
      inputSchema: DirectoryTreeJsonSchema as any, // Cast as any if needed
  
      // Minimal buildPrompt as execution logic is separate
      buildPrompt: (args: any, modelId: string) => {
          const parsed = DirectoryTreeArgsSchema.safeParse(args);
          if (!parsed.success) {
              throw new McpError(ErrorCode.InvalidParams, `Invalid arguments for get_directory_tree: ${parsed.error}`);
          }
          return {
              systemInstructionText: "",
              userQueryText: "",
              useWebSearch: false,
              enableFunctionCalling: false
          };
      },
      // No 'execute' function here
  };

• src/tools/index.ts:14-54 (registration)

  Import and inclusion of directoryTreeTool in allTools array for server registration.

  import { directoryTreeTool } from "./directory_tree.js";
  import { moveFileTool } from "./move_file.js";
  import { searchFilesTool } from "./search_files.js";
  import { getFileInfoTool } from "./get_file_info.js";
  import { executeTerminalCommandTool } from "./execute_terminal_command.js"; // Renamed file and tool variable
  // Import the new combined tools
  import { saveGenerateProjectGuidelinesTool } from "./save_generate_project_guidelines.js";
  import { saveDocSnippetTool } from "./save_doc_snippet.js";
  import { saveTopicExplanationTool } from "./save_topic_explanation.js";
  // Removed old save_query_answer, added new specific ones
  import { saveAnswerQueryDirectTool } from "./save_answer_query_direct.js";
  import { saveAnswerQueryWebsearchTool } from "./save_answer_query_websearch.js";
  
  // Import new research-oriented tools
  import { codeAnalysisWithDocsTool } from "./code_analysis_with_docs.js";
  import { technicalComparisonTool } from "./technical_comparison.js";
  import { architecturePatternRecommendationTool } from "./architecture_pattern_recommendation.js";
  import { dependencyVulnerabilityScanTool } from "./dependency_vulnerability_scan.js";
  import { databaseSchemaAnalyzerTool } from "./database_schema_analyzer.js";
  import { securityBestPracticesAdvisorTool } from "./security_best_practices_advisor.js";
  import { testingStrategyGeneratorTool } from "./testing_strategy_generator.js";
  import { regulatoryComplianceAdvisorTool } from "./regulatory_compliance_advisor.js";
  import { microserviceDesignAssistantTool } from "./microservice_design_assistant.js";
  import { documentationGeneratorTool } from "./documentation_generator.js";
  
  
  export const allTools: ToolDefinition[] = [
      // Query & Generation Tools
      answerQueryWebsearchTool,
      answerQueryDirectTool,
      explainTopicWithDocsTool,
      getDocSnippetsTool,
      generateProjectGuidelinesTool,
      // Filesystem Tools
      readFileTool, // Handles single and multiple files now
      // readMultipleFilesTool, // Merged into readFileTool
      writeFileTool,
      editFileTool,
      // createDirectoryTool, // Removed
      listDirectoryTool,
      directoryTreeTool,