LeetCode MCP Server

Instructions

Implementation Reference

• src/mcp/tools/problem-tools.ts:35-62 (registration)

  Registration of the 'get_problem' tool including description, input schema, and handler function.

  this.server.tool(
      "get_problem",
      "Retrieves details about a specific LeetCode problem, including its description, examples, constraints, and related information",
      {
          titleSlug: z
              .string()
              .describe(
                  "The URL slug/identifier of the problem (e.g., 'two-sum', 'add-two-numbers') as it appears in the LeetCode URL"
              )
      },
      async ({ titleSlug }) => {
          const data =
              await this.leetcodeService.fetchProblemSimplified(
                  titleSlug
              );
          return {
              content: [
                  {
                      type: "text",
                      text: JSON.stringify({
                          titleSlug,
                          problem: data
                      })
                  }
              ]
          };
      }
  );

• src/mcp/tools/problem-tools.ts:45-61 (handler)

  The handler function that executes the tool logic: fetches simplified problem data from LeetCode service and returns it as JSON in a structured content response.

  async ({ titleSlug }) => {
      const data =
          await this.leetcodeService.fetchProblemSimplified(
              titleSlug
          );
      return {
          content: [
              {
                  type: "text",
                  text: JSON.stringify({
                      titleSlug,
                      problem: data
                  })
              }
          ]
      };
  }

• src/mcp/tools/problem-tools.ts:38-44 (schema)

  Input schema definition using Zod for the 'titleSlug' parameter.

  {
      titleSlug: z
          .string()
          .describe(
              "The URL slug/identifier of the problem (e.g., 'two-sum', 'add-two-numbers') as it appears in the LeetCode URL"
          )
  },

• src/index.ts:93-93 (registration)

  Top-level call to register all problem tools, including 'get_problem', on the MCP server instance.

  registerProblemTools(server, leetcodeService);