marketData

Instructions

Implementation Reference

• src/index.ts:72-74 (schema)

  Zod input schema for the marketData tool, defining the 'symbols' parameter as a comma-separated string of trading symbols.

  const marketDataSchema = {
    symbols: z.string().describe('Comma-separated list of symbols')
  };

• src/index.ts:256-289 (handler)

  Full handler implementation for the 'marketData' tool: registers the tool with MCP server, parses 'symbols' argument, calls TradeStation /marketdata/quotes/{symbols} endpoint via authenticated request, returns JSON-formatted quotes or error message.

  server.tool(
    "marketData",
    "Get quotes for symbols",
    marketDataSchema,
    async (args) => {
      try {
        const { symbols } = args;
  
        // Fixed: symbols should be in the path, not query parameter
        const quotes = await makeAuthenticatedRequest(
          `/marketdata/quotes/${encodeURIComponent(symbols)}`
        );
  
        return {
          content: [
            {
              type: "text",
              text: JSON.stringify(quotes, null, 2)
            }
          ]
        };
      } catch (error: unknown) {
        return {
          content: [
            {
              type: "text",
              text: `Failed to fetch market data: ${error instanceof Error ? error.message : 'Unknown error'}`
            }
          ],
          isError: true
        };
      }
    }
  );

• src/index.ts:179-230 (helper)

  Core helper function used by marketData handler for making authenticated HTTP requests to TradeStation API, including automatic token refresh and comprehensive error handling.

  async function makeAuthenticatedRequest(
    endpoint: string,
    method: AxiosRequestConfig['method'] = 'GET',
    data: any = null
  ): Promise<any> {
    const userTokens = tokenStore.get(DEFAULT_USER);
  
    if (!userTokens) {
      throw new Error('User not authenticated. Please set TRADESTATION_REFRESH_TOKEN in .env file.');
    }
  
    // Check if token is expired or about to expire (within 60 seconds)
    if (userTokens.expiresAt < Date.now() + 60000) {
      // Refresh the token
      const newTokens = await refreshToken(userTokens.refreshToken);
      tokenStore.set(DEFAULT_USER, newTokens);
    }
  
    try {
      const options: AxiosRequestConfig = {
        method,
        url: `${TS_API_BASE}${endpoint}`,
        headers: {
          'Authorization': `Bearer ${tokenStore.get(DEFAULT_USER)?.accessToken}`,
          'Content-Type': 'application/json',
          'Accept': 'application/json'
        },
        timeout: 60000
      };
  
      if (data && (method === 'POST' || method === 'PUT' || method === 'PATCH')) {
        options.data = data;
      }
  
      const response = await axios(options);
      return response.data;
    } catch (error: unknown) {
      if (error instanceof AxiosError) {
        const errorMessage = error.response?.data?.Message || error.response?.data?.message || error.message;
        const statusCode = error.response?.status;
        console.error(`API request error [${statusCode}]: ${errorMessage}`);
        console.error('Endpoint:', endpoint);
        throw new Error(`API Error (${statusCode}): ${errorMessage}`);
      } else if (error instanceof Error) {
        console.error('API request error:', error.message);
        throw error;
      } else {
        console.error('Unknown API request error:', error);
        throw new Error('Unknown API request error');
      }
    }
  }

• src/index.ts:145-176 (helper)

  Helper function for refreshing OAuth access tokens, called by makeAuthenticatedRequest when token is expired.

  async function refreshToken(refreshToken: string): Promise<TokenData> {
    try {
      const response = await axios.post<RefreshTokenResponse>(TS_TOKEN_URL,
        new URLSearchParams({
          grant_type: 'refresh_token',
          client_id: TS_CLIENT_ID!,
          client_secret: TS_CLIENT_SECRET!,
          refresh_token: refreshToken
        }), 
        {
          headers: {
            'Content-Type': 'application/x-www-form-urlencoded'
          }
        }
      );
      
      return {
        accessToken: response.data.access_token,
        refreshToken: refreshToken,
        expiresAt: Date.now() + 3600000 // 1 hour from now
      };
    } catch (error: unknown) {
      if (error instanceof AxiosError) {
        console.error('Error refreshing token:', error.response?.data || error.message);
      } else if (error instanceof Error) {
        console.error('Error refreshing token:', error.message);
      } else {
        console.error('Unknown error refreshing token:', error);
      }
      throw new Error('Failed to refresh token');
    }
  }