Example of a custom Cake tool utilizing the in Cake built on tool classes, settings and tool resolution

build.cake

#load "./customtool.cake"
#load "./mytools.cake"

GitStatus();
GitBranch(new CustomToolSettings { ToolPath = "/bin/git.exe" });

customtool.cake

public class CustomToolSettings : Cake.Core.Tooling.ToolSettings
{
}

public class CustomTool : Cake.Core.Tooling.Tool<CustomToolSettings>
{
    private readonly string _toolName;
    private readonly string _exeName;

    public static CustomToolHandler GetCustomAlias(ICakeContext context, string toolName, string exeName, Func<CustomToolSettings, ProcessArgumentBuilder> getArguments)
    {
        return (settings) => new CustomTool(
            context,
            toolName,
            exeName
            ).Run(settings ?? new CustomToolSettings(), getArguments(settings));
    }

    protected override string GetToolName()
    {
        return _toolName;
    }

    protected override IEnumerable<string> GetToolExecutableNames()
    {
        return new[] { _exeName };
    }

    private CustomTool(ICakeContext context, string toolName, string exeName)
        : base(context.FileSystem, context.Environment, context.ProcessRunner, context.Tools)
    {
        _toolName = toolName;
        _exeName = exeName;
    }

    public delegate void CustomToolHandler(CustomToolSettings settings = null);
}

mytools.cake

var GitStatus = CustomTool.GetCustomAlias(Context, "git", "git.exe", settings=>"status");
var GitBranch = CustomTool.GetCustomAlias(Context, "git", "git.exe", settings=>"branch");