A few months ago I added a tool to my blog for bulk-applying tags to old content. It works as an extension to my existing search interface, letting me run searches and then quickly apply a tag to relevant results.
Since adding this I've been much more aggressive in categorizing my older content, including adding new tags when I spot an interesting trend that warrants its own page.
Today I added system-prompts and applied it to 41 existing posts that talk about system prompts for LLM systems, including a bunch that directly quote system prompts that have been deliberately published or leaked.
Other tags I've added recently include press-quotes for times I've been quoted in the press, agent-definitions for my ongoing collection of different ways people define "agents" and paper-review for posts where I review an academic paper.