GitHub MCP Server

Instructions

Implementation Reference

• src/tools.ts:141-181 (handler)

  The main execution logic for the 'search-repos' tool, using Octokit to query GitHub's search API and format results.

  const searchRepos = async (args: SearchReposArgs) => {
    const { query, sort = "stars", limit = 5 } = args;
    
    try {
      const response = await octokit.rest.search.repos({
        q: query,
        sort,
        per_page: limit,
      });
      
      return {
        content: [
          {
            type: "text",
            text: JSON.stringify(
              response.data.items.map(repo => ({
                name: repo.full_name,
                description: repo.description,
                stars: repo.stargazers_count,
                url: repo.html_url,
                language: repo.language,
                forks: repo.forks_count,
              })),
              null,
              2
            ),
          },
        ],
      };
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : 'Unknown error occurred';
      return {
        content: [
          {
            type: "text",
            text: `Error searching repositories: ${errorMessage}`,
          },
        ],
      };
    }
  };

• src/tools.ts:10-32 (schema)

  Input schema definition for the 'search-repos' tool, used for listing and validation.

  "search-repos": {
    name: "search-repos",
    description: "Search for GitHub repositories",
    inputSchema: {
      type: "object",
      properties: {
        query: {
          type: "string",
          description: "Search query",
        },
        sort: {
          type: "string",
          enum: ["stars", "forks", "help-wanted-issues", "updated"],
          description: "Sort order",
        },
        limit: {
          type: "number",
          description: "Maximum number of results to return",
        }
      },
      required: ["query"],
    },
  },

• src/handlers.ts:18-32 (registration)

  MCP server request handlers for listing tools (using 'tools' object) and calling tools (using 'toolHandlers' map).

      // tools
      server.setRequestHandler(ListToolsRequestSchema, async () => ({
          tools: Object.values(tools)
      }));
      server.setRequestHandler(CallToolRequestSchema, async (request) => {
          type ToolHandlerKey = keyof typeof toolHandlers;
          const { name, arguments: params } = request.params ?? {};
          const handler = toolHandlers[name as ToolHandlerKey];
  
          if (!handler) throw new Error("tool not found");
  
          type HandlerParams = Parameters<typeof handler>;
          return handler(params as any);
      })
  }

• src/tools.ts:322-327 (registration)

  Export of the toolHandlers object mapping tool names to their handler functions, imported and used in handlers.ts.

  export const toolHandlers = {
    "search-repos": searchRepos,
    "get-repo-info": getRepoInfo,
    "list-issues": listIssues,
    "create-issue": createIssue,
  };

• src/tools.ts:114-118 (schema)

  TypeScript type definition for the input arguments of the searchRepos handler.

  type SearchReposArgs = {
    query: string;
    sort?: "stars" | "forks" | "help-wanted-issues" | "updated";
    limit?: number;
  };