Get Top Gainers

Instructions

Implementation Reference

• src/index.ts:201-230 (handler)

  Core handler that fetches top gainers from the CSE API (https://www.cse.lk/api/topGainers) and maps the response to symbol, price, change, and changePercentage fields.

  async function getTopGainers() {
    try {
      const response = await axios.post(
        'https://www.cse.lk/api/topGainers',
        {},
        {
          headers: {
            'Content-Type': 'application/json'
          },
          timeout: 10000
        }
      );
      
      const data = response.data || [];
      
      return data.map((item: any) => ({
        symbol: item.symbol,
        price: item.price,
        change: item.change,
        changePercentage: item.changePercentage
      }));
    } catch (error: any) {
      if (error.code === 'ECONNABORTED') {
        throw new Error('Request timed out. Please try again.');
      } else if (error.response) {
        throw new Error(`API error: ${error.response.status} - ${error.response.statusText}`);
      } else {
        throw new Error(`Network error: ${error.message}`);
      }
    }

• src/index.ts:464-507 (registration)

  Registration of the 'get_top_gainers' tool with the MCP server, including its title, description, empty inputSchema, and the handler that calls getTopGainers() and formats results.

  server.registerTool(
    "get_top_gainers",
    {
      title: "Get Top Gainers",
      description: "Get the top 10 gaining stocks in the CSE for the current trading day.",
      inputSchema: {}
    },
    async () => {
      try {
        const topGainers = await getTopGainers();
        
        const formattedGainers = topGainers.map((stock: any, index: number) => {
          const priceChangeSymbol = stock.change >= 0 ? '+' : '';
          return {
            rank: index + 1,
            symbol: stock.symbol,
            price: `Rs. ${stock.price.toFixed(2)}`,
            change: `${priceChangeSymbol}${stock.change.toFixed(2)}`,
            changePercentage: `${priceChangeSymbol}${stock.changePercentage.toFixed(2)}%`
          };
        });
        
        return {
          content: [{
            type: "text",
            text: JSON.stringify({
              title: "Top 10 Gainers",
              count: formattedGainers.length,
              gainers: formattedGainers,
              lastUpdated: new Date().toISOString()
            }, null, 2)
          }]
        };
      } catch (error: any) {
        return {
          content: [{
            type: "text",
            text: `Error fetching top gainers: ${error.message}`
          }],
          isError: true
        };
      }
    }
  );

• src/index.ts:466-469 (schema)

  Schema definition for the get_top_gainers tool: title, description, and an empty inputSchema (no parameters required).

  {
    title: "Get Top Gainers",
    description: "Get the top 10 gaining stocks in the CSE for the current trading day.",
    inputSchema: {}