gemini_search

Instructions

Implementation Reference

• src/handlers/direct-search-alt.ts:22-126 (handler)

  Core handler function that implements the gemini_search tool. Validates input, selects Gemini 2.0 Flash model, constructs SDK request with Google Search tool, executes API call, and formats response.

  export async function handleDirectSearchAlt(request: any) {
    try {
      // Validate required parameters
      if (!request.params.arguments || typeof request.params.arguments.query !== 'string') {
        throw new McpError(
          ErrorCode.InvalidParams,
          'Query parameter is required and must be a string'
        );
      }
  
      // Extract arguments as SearchArgs
      const args = request.params.arguments as SearchArgs;
      const { query, file_path, model_id } = args;
  
      if (file_path) {
        console.error(`[handleDirectSearchAlt] Received file_path: ${typeof file_path === 'string' ? file_path : JSON.stringify(file_path)}`);
        console.error(`[handleDirectSearchAlt] File path exists check: ${await fileExists(typeof file_path === 'string' ? file_path : file_path[0])}`);
      }
  
      // Select the model using the tool-specific model selector
      const targetModelId = model_id || 'gemini-2.0-flash-001';
      console.error(`[handleDirectSearchAlt] Using model: ${targetModelId}`);
  
      try {
        // Create the model instance
        const model = genAI.getGenerativeModel({ model: targetModelId });
  
        // Build a request that works with Flash models (no system role)
        // This exact format has been verified to work with gemini-2.0-flash-001
        const sdkRequest: any = {
          contents: [{
            role: 'user',
            parts: [{
              text: query
            }]
          }],
          systemInstruction: "You have access to Google Search. You MUST use Google Search for ALL queries to provide accurate, up-to-date information. Do not rely solely on your training data.",
          generationConfig: {
            temperature: 0.7,
            topP: 0.8,
            topK: 40
          },
          tools: [{
            googleSearch: {}
          }],
          toolConfig: {
            functionCallingConfig: {
              mode: "AUTO"
            }
          }
        };
  
        console.error(`[handleDirectSearchAlt] Sending request to ${targetModelId}`);
        
        // Send request to Gemini API
        const result = await model.generateContent(sdkRequest);
        const response = result.response;
        console.error(`[handleDirectSearchAlt] SDK Response received from ${targetModelId}`);
  
        // Extract text from response
        let responseText = "";
        try {
          responseText = response.text();
        } catch (e) {
          console.error(`[handleDirectSearchAlt] Error extracting text:`, e);
          if (response.candidates && response.candidates.length > 0 && 
              response.candidates[0].content && 
              response.candidates[0].content.parts && 
              response.candidates[0].content.parts.length > 0) {
            responseText = response.candidates[0].content.parts[0].text || "";
          }
        }
  
        // Create a simple response object
        return {
          content: [
            {
              type: 'text',
              text: responseText
            }
          ]
        };
      } catch (apiError) {
        console.error('API error in direct search handler:', apiError);
        if (apiError instanceof McpError) {
          throw apiError;
        }
        throw apiError;
      }
    } catch (error) {
      console.error('Error in direct search handler:', error);
      if (error instanceof McpError) {
        throw error;
      }
      return {
        content: [
          {
            type: 'text',
            text: `Error: ${error instanceof Error ? error.message : 'Unknown error'}`
          }
        ],
        isError: true
      };
    }
  }

• src/index.ts:206-228 (registration)

  Tool dispatch switch statement that registers and routes 'gemini_search' (both canonical TOOL_NAMES.GEM_SEARCH and legacy name) to the handleDirectSearchAlt handler.

  switch (request.params.name) {
    case TOOL_NAMES.GEM_SEARCH:
      // Use the alternative direct search handler that works with Flash models
      return await handleDirectSearchAlt(request);
    case TOOL_NAMES.GEM_REASON:
      return await handleReason(request);
    case TOOL_NAMES.GEM_CODE:
      return await handleCode(request);
    case TOOL_NAMES.GEM_FILEOPS:
      return await handleFileops(request);
    // Support legacy tool names for backward compatibility
    case 'gemini_search':
      // Use the alternative direct search handler that works with Flash models
      return await handleDirectSearchAlt(request);
    case 'gemini_reason':
      return await handleReason(request);
    default:
      console.error(`Unknown tool requested: ${request.params.name}`);
      throw new McpError(
        ErrorCode.MethodNotFound,
        `Unknown tool: ${request.params.name}. Available tools: gemini_search, gemini_reason, gemini_code, gemini_fileops`
      );
  }

• src/index.ts:65-90 (schema)

  Input schema and description for the gemini_search tool, provided in the ListTools MCP response.

  {
    name: TOOL_NAMES.GEM_SEARCH,
    description: 'Generates responses based on the latest information using Gemini 2.0 Flash and Google Search. Best for general knowledge questions, fact-checking, and information retrieval.',
    inputSchema: {
      type: 'object',
      properties: {
        query: {
          type: 'string',
          description: 'Your search query or question'
        },
        file_path: {
          type: 'string',
          description: 'Optional file path to include with the query'
        },
        model_id: {
          type: 'string',
          description: 'Optional model ID override (advanced users only)'
        },
        enable_thinking: {
          type: 'boolean',
          description: 'Enable thinking mode for step-by-step reasoning'
        }
      },
      required: ['query'],
    },
  },

• src/config/constants.ts:105-117 (helper)

  Constants defining tool names, including GEM_SEARCH: 'gemini_search' and legacy aliases used throughout the codebase.

  export const TOOL_NAMES = {
    // New specialized toolset
    GEM_SEARCH: 'gemini_search',    // For search-enabled queries (Gemini 2.0 Flash)
    GEM_REASON: 'gemini_reason',    // For complex reasoning (Gemini 2.5 Flash/Pro)
    GEM_CODE: 'gemini_code',        // For coding tasks (Gemini 2.5 Pro)
    GEM_FILEOPS: 'gemini_fileops',  // For file operations (Gemini 2.0 Flash-Lite/1.5 Pro)
  
    // Legacy names for backward compatibility - only keeping what's needed
    SEARCH: 'gemini_search',
    REASON: 'gemini_reason',
    ANALYZE_FILE: 'gemini_analyze',
    RAPID_SEARCH: 'gemini_search'
  };

• dist/interfaces/tool-args.d.ts:2-10 (schema)

  TypeScript interface defining the input arguments for the gemini_search tool.

  /**
   * Arguments for gemini_search tool
   */
  export interface SearchArgs extends BaseArgs, FileInput {
      /** The search query */
      query: string;
      /** Whether to enable thinking mode */
      enable_thinking?: boolean;
  }