mcp-server-leetcode

Implementation Reference

• src/tools/problem-tools.ts:35-51 (handler)

  The handler function for the "get-problem" tool. It takes a titleSlug parameter, fetches the problem data from LeetCodeService, and returns the data as a formatted JSON text content block or an error response.

  async ({ titleSlug }) => {
    try {
      const data = await leetcodeService.fetchProblem(titleSlug);
      return {
        content: [{ 
          type: "text", 
          text: JSON.stringify(data, null, 2)
        }]
      };
    } catch (error: unknown) {
      const errorMessage = error instanceof Error ? error.message : String(error);
      return {
        content: [{ type: "text", text: `Error: ${errorMessage}` }],
        isError: true
      };
    }
  }

• src/tools/problem-tools.ts:32-34 (schema)

  Input schema for the "get-problem" tool using Zod, defining the required titleSlug string parameter.

  {
    titleSlug: z.string().describe("The URL slug of the problem (e.g., 'two-sum')")
  },

• src/tools/problem-tools.ts:30-52 (registration)

  Registration of the "get-problem" tool on the MCP server, specifying the name, input schema, and handler function.

  server.tool(
    "get-problem",
    {
      titleSlug: z.string().describe("The URL slug of the problem (e.g., 'two-sum')")
    },
    async ({ titleSlug }) => {
      try {
        const data = await leetcodeService.fetchProblem(titleSlug);
        return {
          content: [{ 
            type: "text", 
            text: JSON.stringify(data, null, 2)
          }]
        };
      } catch (error: unknown) {
        const errorMessage = error instanceof Error ? error.message : String(error);
        return {
          content: [{ type: "text", text: `Error: ${errorMessage}` }],
          isError: true
        };
      }
    }
  );

• src/services/leetcode-service.ts:79-81 (helper)

  Helper method in LeetCodeService that fetches problem details by executing a GraphQL query with the given titleSlug.

  async fetchProblem(titleSlug: string) {
    return this.executeQuery(problemDetailsQuery, { titleSlug });
  }