technicalIndicators_dx
Calculate the Directional Movement Index (DX) for financial assets using specified stock symbols, intervals, and time periods. Access and analyze trend strength data directly from Alpha Vantage via MCP Avantage for informed trading decisions.
Instructions
Directional Movement Index (DX)
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| datatype | No | Data format for the response. | json |
| interval | Yes | Time interval (e.g., "daily", "60min", "weekly"). Check Alpha Vantage docs for valid intervals per indicator. | |
| month | No | Specific month for intraday intervals (YYYY-MM format). | |
| symbol | Yes | The stock symbol (e.g., "IBM"). | |
| time_period | Yes | Number of data points used to calculate the indicator. |
Input Schema (JSON Schema)
{
"additionalProperties": false,
"description": "Parameters for DX.",
"properties": {
"datatype": {
"default": "json",
"description": "Data format for the response.",
"enum": [
"json",
"csv"
],
"type": "string"
},
"interval": {
"description": "Time interval (e.g., \"daily\", \"60min\", \"weekly\"). Check Alpha Vantage docs for valid intervals per indicator.",
"type": "string"
},
"month": {
"description": "Specific month for intraday intervals (YYYY-MM format).",
"type": "string"
},
"symbol": {
"description": "The stock symbol (e.g., \"IBM\").",
"type": "string"
},
"time_period": {
"description": "Number of data points used to calculate the indicator.",
"type": "string"
}
},
"required": [
"symbol",
"interval",
"time_period"
],
"type": "object"
}
Implementation Reference
- src/index.ts:1389-1395 (handler)The execute handler for the 'technicalIndicators_dx' tool, which invokes the generic executeAvantageTool helper passing the specific AVantage library method av.technicalIndicators.dx(params). This is the direct implementation of the tool's execution logic.execute: ( args, context // Let type be inferred ) => executeAvantageTool("technicalIndicators_dx", args, context, (av, params) => av.technicalIndicators.dx(params) ),
- src/index.ts:1385-1396 (registration)Registers the 'technicalIndicators_dx' MCP tool with the FastMCP server, including name, description, input schema, and execute handler.server.addTool({ name: "technicalIndicators_dx", description: "Directional Movement Index (DX)", parameters: schemas.TechnicalIndicatorsDxParamsSchema, execute: ( args, context // Let type be inferred ) => executeAvantageTool("technicalIndicators_dx", args, context, (av, params) => av.technicalIndicators.dx(params) ), });
- src/schemas.ts:247-247 (schema)Zod schema defining input parameters for the 'technicalIndicators_dx' tool, extending the common time-period schema.export const TechnicalIndicatorsDxParamsSchema = TechnicalIndicatorsTimePeriodOnlyParamsSchema.describe('Parameters for DX.');
- src/index.ts:38-115 (helper)Generic helper function used by all tools, including 'technicalIndicators_dx', to manage AVantage client resources, perform API calls to Alpha Vantage library methods, handle authentication/errors, and return JSON string results.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}` ); } }