technicalIndicators_mfi
Calculate the Money Flow Index (MFI) to identify overbought or oversold conditions in stocks using price and volume data for technical analysis.
Instructions
Money Flow Index (MFI)
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| symbol | Yes | The stock symbol (e.g., "IBM"). | |
| interval | Yes | Time interval (e.g., "daily", "60min", "weekly"). Check Alpha Vantage docs for valid intervals per indicator. | |
| datatype | No | Data format for the response. | json |
| month | No | Specific month for intraday intervals (YYYY-MM format). | |
| time_period | Yes | Number of data points used to calculate the indicator. |
Implementation Reference
- src/index.ts:1340-1354 (handler)The handler implementation for the technicalIndicators_mfi tool. It registers the tool with the MCP server and defines the execute function that invokes the Alpha Vantage MFI technical indicator via the shared executeAvantageTool utility.server.addTool({ name: "technicalIndicators_mfi", description: "Money Flow Index (MFI)", parameters: schemas.TechnicalIndicatorsMfiParamsSchema, execute: ( args, context // Let type be inferred ) => executeAvantageTool( "technicalIndicators_mfi", args, context, (av, params) => av.technicalIndicators.mfi(params) ), });
- src/schemas.ts:246-246 (schema)Zod schema defining the input parameters for the technicalIndicators_mfi tool, based on the common time-period-only parameters schema.export const TechnicalIndicatorsMfiParamsSchema = TechnicalIndicatorsTimePeriodOnlyParamsSchema.describe('Parameters for MFI.');
- src/index.ts:38-115 (helper)Shared helper function used by the technicalIndicators_mfi handler (and all other tools) to manage Alpha Vantage client instances, perform API calls, and handle responses and errors.async function executeAvantageTool<TArgs, TResult>( toolName: string, args: TArgs, context: Context<Record<string, unknown> | undefined>, // Use the imported Context type directly avantageMethod: ( av: AVantage, args: TArgs ) => Promise<{ error?: boolean; reason?: string; data?: TResult }> ): Promise<string> { logger.info(`Executing '${toolName}' tool for request ID: ${context}`); logger.debug(`Args for ${toolName}: ${JSON.stringify(args)}`); // --- Authentication & Resource Management --- // Access extraArgs safely - it might be null or undefined const extraArgsApiKey = context.extraArgs?.apiKey as string | undefined; const apiKey = extraArgsApiKey || config.apiKey; if (!apiKey) { logger.error(`'${toolName}' failed: Alpha Vantage API key missing.`); throw new UserError(apiKeyErrorMessage); } logger.debug( `Using AV API key (source: ${extraArgsApiKey ? "extraArgs" : "environment"}) for ${toolName}` ); try { // Get or create AVantage instance managed by ResourceManager const av = await resourceManager.getResource<AVantage>( apiKey, // Cache key is the resolved API key "avantage_client", // Type identifier for logging async (key) => { // Factory Function logger.info( `Creating new AVantage instance for key ending ...${key.slice(-4)}` ); // AVantage library reads AV_PREMIUM from process.env internally return new AVantage(key); }, async (avInstance) => { // Cleanup Function (no-op needed for AVantage) logger.debug(`Destroying AVantage instance (no-op)`); } ); // --- Library Call --- const result = await avantageMethod(av, args); // --- Response Handling --- if (result.error) { logger.warn( `'${toolName}' failed. Reason from avantage: ${result.reason}` ); throw new UserError(result.reason || `Tool '${toolName}' failed.`); } if (result.data === undefined || result.data === null) { logger.warn(`'${toolName}' completed successfully but returned no data.`); return "null"; // Return string "null" for empty data } logger.info(`'${toolName}' completed successfully.`); // Stringify the data part of the response return JSON.stringify(result.data); } catch (error: any) { logger.error( `Error during execution of '${toolName}': ${error.message}`, error ); // If it's already a UserError, rethrow it if (error instanceof UserError) { throw error; } // Otherwise, wrap it in a UserError throw new UserError( `An unexpected error occurred while executing tool '${toolName}': ${error.message}` ); } }