MCP Character Counter

Instructions

Implementation Reference

• mcp/character-counter.js:28-73 (handler)

  The handler function that executes the tool logic: counts total characters, without spaces, letters, numbers, and symbols in the input text, logs details, and returns a formatted analysis.

    async ({ text }) => {
      server.server.sendLoggingMessage({
        level: "info",
        data: text,
      });
  
      // Total character count
      const totalCount = text.length;
  
      // Character count without spaces
      const noSpacesCount = text.replace(/\s/g, "").length;
  
      // Letter count (a-z, A-Z)
      const lettersCount = (text.match(/[a-zA-Z]/g) || []).length;
  
      // Number count
      const numbersCount = (text.match(/[0-9]/g) || []).length;
  
      // Symbol count (everything that is not a letter, number, or space)
      const symbolsCount = (text.match(/[^a-zA-Z0-9\s]/g) || []).length;
  
      server.server.sendLoggingMessage({
        level: "info",
        data: {
          totalCount,
          noSpacesCount,
          lettersCount,
          numbersCount,
          symbolsCount,
        },
      });
  
      return {
        content: [
          {
            type: "text",
            text: `Character analysis:
  - Total characters: ${totalCount}
  - Characters without spaces: ${noSpacesCount}
  - Letters: ${lettersCount}
  - Numbers: ${numbersCount}
  - Symbols: ${symbolsCount}`,
          },
        ],
      };
    }

• mcp/character-counter.js:25-27 (schema)

  Input schema for the tool using Zod: requires a 'text' string parameter.

  {
    text: z.string().describe("The text whose characters you want to count"),
  },

• mcp/character-counter.js:22-74 (registration)

  Registration of the 'count-characters-in-text' tool using server.tool, including name, description, input schema, and handler function.

  server.tool(
    "count-characters-in-text",
    "Count characters in a text",
    {
      text: z.string().describe("The text whose characters you want to count"),
    },
    async ({ text }) => {
      server.server.sendLoggingMessage({
        level: "info",
        data: text,
      });
  
      // Total character count
      const totalCount = text.length;
  
      // Character count without spaces
      const noSpacesCount = text.replace(/\s/g, "").length;
  
      // Letter count (a-z, A-Z)
      const lettersCount = (text.match(/[a-zA-Z]/g) || []).length;
  
      // Number count
      const numbersCount = (text.match(/[0-9]/g) || []).length;
  
      // Symbol count (everything that is not a letter, number, or space)
      const symbolsCount = (text.match(/[^a-zA-Z0-9\s]/g) || []).length;
  
      server.server.sendLoggingMessage({
        level: "info",
        data: {
          totalCount,
          noSpacesCount,
          lettersCount,
          numbersCount,
          symbolsCount,
        },
      });
  
      return {
        content: [
          {
            type: "text",
            text: `Character analysis:
  - Total characters: ${totalCount}
  - Characters without spaces: ${noSpacesCount}
  - Letters: ${lettersCount}
  - Numbers: ${numbersCount}
  - Symbols: ${symbolsCount}`,
          },
        ],
      };
    }
  );