My agentic toolkit is now open source

Most plugin marketplaces drop everything at once and ask the audience to figure out what matters. This one won’t. github.com/marsmike/agentic-toolkit is public today, and it’ll release plugins one at a time, in the order I’d hand them to a colleague.

What’s there today: the marketplace manifest, a license (MIT), a contributor agreement (DCO sign-off), and the first plugin — feinschliff, just released as v0.1.0. There are around twenty plugins on the private side right now. They’ve been built and battle-tested across actual daily work, research, knowledge management, deck production, video pipelines, homelab control, social amplification. They’ll arrive here one by one, each as its own teaching artifact, each in the shape it deserves.

Big-bang launches optimize for repo stars on launch day. They don’t optimize for the engineer who’s actually trying to use one of these tools tomorrow morning. A plugin released alone gets the post it deserves: what it does, what it doesn’t do, the problem it was built to solve, the trade-offs you’d want to know about before installing. That’s the editorial bet — slow-cooked, not microwaved. It’s slower; it’s better. Each plugin ships with the explanation and documentation it deserves. It’s also the same craft I’ve been writing about in another shape, explaining what code does to people who don’t write code. Apply that to OSS and you don’t drop twenty repos on someone’s lap. You hand them one. With a story.

Feinschliff lands today. It turns Claude Design HTML into brand-perfect PowerPoint decks — the plugin I use most days in my own work, and the reason the marketplace exists in this shape. It’s the anchor: get the design system right, and every other plugin that produces visuals (slides, video frames, infographics, social cards) inherits the brand discipline for free. The post about feinschliff specifically follows once it’s live; this post is the announcement that the marketplace is open and the cadence has started.

Nacht Schafft Wissen, “night creates knowledge,” wasn’t just the title of a Friday event. It’s been my actual mantra since the start of this year. Close the work laptop at BSH. Bike home. Open the MacBook on the kitchen table. Keep building. What I’ve been building, night after night, is Claude Code plugins. Plugins for Claude, written with Claude. Some help me research and turn notes into knowledge. Some build decks, videos, visualizations. Some run a homelab. They’ve been carrying my own work for months. The throughline these plugins keep proving, and what I’ll be writing about, is that the harness does more cognitive work than the model itself. Context engineering, agent memory, background agents, self-improving skills: those are the threads I’ll pull on. The next few weeks lean toward the knowledge-management and content-creation side, the plugins I reach for most when notes have to become a published post. They’ll arrive here one at a time, each with the post that explains what it does and why it earns its keep.

This is also the day marsmike.com replaces “Coming Soon.” What you’ll find here is the deeper version of what I post on LinkedIn, the same ideas with room to show the code, the trade-offs, and the things that didn’t work. Research and practice from these past months, in plain language, one piece at a time. The RSS feed is at /rss.xml; the EN feed is at /en/rss.xml. LinkedIn for the conversations. GitHub for the code. No newsletter, no popups, no “subscribe to keep reading.” Just the writing.