getDEMA

Instructions

Implementation Reference

• src/tools/technical-indicators.ts:136-174 (handler)

  The MCP tool registration and handler for 'getDEMA'. It registers the tool with a Zod schema for input validation (symbol, periodLength, timeframe, optional from_date and to), and the async handler calls technicalIndicatorsClient.getDEMA() then returns the result as JSON.

  server.tool(
    "getDEMA",
    "Calculate the Double Exponential Moving Average (DEMA) for a stock using the FMP DEMA API. This tool helps users analyze trends and identify potential buy or sell signals based on historical price data.",
    {
      symbol: z.string().describe("Stock symbol"),
      periodLength: z.number().describe("Period length for the indicator"),
      timeframe: z
        .string()
        .describe("Timeframe (1min, 5min, 15min, 30min, 1hour, 4hour, 1day)"),
      from_date: z.string().optional().describe("Start date (YYYY-MM-DD)"),
      to: z.string().optional().describe("End date (YYYY-MM-DD)"),
    },
    async ({ symbol, periodLength, timeframe, from_date: from, to }) => {
      try {
        const results = await technicalIndicatorsClient.getDEMA({
          symbol,
          periodLength,
          timeframe,
          from,
          to,
        });
        return {
          content: [{ type: "text", text: JSON.stringify(results, null, 2) }],
        };
      } catch (error) {
        return {
          content: [
            {
              type: "text",
              text: `Error: ${
                error instanceof Error ? error.message : String(error)
              }`,
            },
          ],
          isError: true,
        };
      }
    }
  );

• src/api/technical-indicators/types.ts:26-29 (schema)

  The DEMAIndicator interface extending TechnicalIndicatorBase, defining the shape of the DEMA API response with an additional 'dema' field.

  // Double Exponential Moving Average (DEMA)
  export interface DEMAIndicator extends TechnicalIndicatorBase {
    dema: number;
  }

• src/api/technical-indicators/types.ts:57-63 (schema)

  The TechnicalIndicatorParams interface used as input parameters for the getDEMA request.

  export interface TechnicalIndicatorParams {
    symbol: string;
    periodLength: number;
    timeframe: string;
    from?: string;
    to?: string;
  }

• src/api/technical-indicators/TechnicalIndicatorsClient.ts:75-92 (helper)

  The TechnicalIndicatorsClient.getDEMA() method that makes the actual API call to /technical-indicators/dema endpoint via the base FMPClient.

  /**
   * Get Double Exponential Moving Average (DEMA) indicator
   * @param params Technical indicator parameters
   * @param options Optional parameters including abort signal and context
   */
  async getDEMA(
    params: TechnicalIndicatorParams,
    options?: {
      signal?: AbortSignal;
      context?: FMPContext;
    }
  ): Promise<DEMAIndicator[]> {
    return super.get<DEMAIndicator[]>(
      "/technical-indicators/dema",
      params,
      options
    );
  }

• src/tools/technical-indicators.ts:10-14 (registration)

  The registerTechnicalIndicatorsTools function that creates the TechnicalIndicatorsClient instance (which the getDEMA handler uses). This is the registration entry point for all technical indicator tools.

  export function registerTechnicalIndicatorsTools(
    server: McpServer,
    accessToken?: string
  ): void {
    const technicalIndicatorsClient = new TechnicalIndicatorsClient(accessToken);