Your first draft

With both modules installed, put this in your PowerShell profile:

Import-Module PSLoom
Invoke-Loom -Draft {
    Thread Reed
    Style ':completion:*' enabled $true
    Treadle glog { git log --oneline }
    Sley git {
        Command log {
            Option '--oneline' -Description 'Show one line per commit'
            Option '--max-count' -Alias '-n' { Argument count }
        }
        Command status
    }
}

Thread provisions Reed before execution. Style stores a context-pattern value (styles only affect a feature when that feature reads them). Treadle defines a global shortcut that appends your arguments. Sley registers completion for git, including the baked git log --oneline context of glog.

Thread must be a top-level statement with a literal name, and a literal -Version if supplied. Do not hide it in a loop, condition or nested block.

Validate and measure

Invoke-Loom -Validate -Draft {
    Thread Reed
    Sley git { Command status }
}
Measure-Loom
Measure-Loom -GroupBy Verb

Validation imports installed harnesses and checks scopes without executing the draft or installing missing modules. Measure-Loom reads the last executed draft; it does not run a benchmark or execute its own draft.

A second ordinary Invoke-Loom is a no-op. Use Invoke-Loom -Reweave -Draft { ... } with the full edited draft to skip unchanged verbs, replay changed ones and revert removed supported verbs. Arbitrary PowerShell statements run again. See the pipeline and staged application.