GitLab MCP Server

Instructions

Implementation Reference

• src/handlers/users-groups-handlers.ts:99-107 (handler)

  The handler function that implements the gitlab_list_project_members tool. It extracts the project_id from arguments, validates it, calls the usersGroupsManager.listProjectMembers method, and formats the response.

  export const listProjectMembers: ToolHandler = async (params, context) => {
    const { project_id } = params.arguments || {};
    if (!project_id) {
      throw new McpError(ErrorCode.InvalidParams, 'project_id is required');
    }
    
    const data = await context.usersGroupsManager.listProjectMembers(project_id as string | number);
    return formatResponse(data);
  };

• src/utils/tools-data.ts:817-830 (schema)

  The input schema definition for the gitlab_list_project_members tool, specifying the required project_id parameter.

  {
    name: 'gitlab_list_project_members',
    description: 'List members of a project',
    inputSchema: {
      type: 'object',
      properties: {
        project_id: {
          type: 'string',
          description: 'The ID or URL-encoded path of the project'
        }
      },
      required: ['project_id']
    }
  },

• src/utils/tool-registry.ts:62-70 (registration)

  The tool registry mapping where gitlab_list_project_members is registered to the usersGroupsHandlers.listProjectMembers handler function.

  // Users and Groups tools
  gitlab_list_users: usersGroupsHandlers.listUsers,
  gitlab_get_user: usersGroupsHandlers.getUser,
  gitlab_list_groups: usersGroupsHandlers.listGroups,
  gitlab_get_group: usersGroupsHandlers.getGroup,
  gitlab_list_group_members: usersGroupsHandlers.listGroupMembers,
  gitlab_add_group_member: usersGroupsHandlers.addGroupMember,
  gitlab_list_project_members: usersGroupsHandlers.listProjectMembers,
  gitlab_add_project_member: usersGroupsHandlers.addProjectMember