Your writing voice is already on the page. Everything you've published is a record of how you actually write — consistent enough that a tool can learn it from your posts, even if you couldn't spell it out yourself. ghost-blog-mcp is the Claude Code plugin I draft and edit these posts with. The first thing it did on this blog was read everything I'd published and build a style guide out of it, so its drafts start in my voice instead of a generic one — then I edit from there. You can point it at your own posts and do the same.
Getting a model to draft in that voice wasn't automatic. The drafts were wrong for a long time, and what eventually got them right wasn't a list of rules to follow — it was examples: the posts I pointed it to, and the edits I made by hand. The style guide is where all of that collects.