One window for every Claude Code skill, subagent, plugin, marketplace, MCP server.
Skills, subagents, plugins, marketplaces, and MCP servers, at user level and per project. Know what's stale and update it, park what you're not using, and edit a server without opening a config file.
Free · MIT-licensed · Apple silicon · macOS 13 or later
The Needs updating screen: the skills, plugin, marketplace, and MCP server that have fallen behind, an update button on each, and Update all to work through the list.
One set of controls for everything Claude Code scattered.
Skills in one folder, plugins in another, marketplaces as git clones, MCP servers spread across config files. Fettlr reads all of it where it already lives.
One place for all of it
Skills, subagents, plugins, marketplaces, and MCP servers, at user level and for every project Claude Code knows about. Read from the files that are already there, so there is no import step and no second source of truth.
Stale is obvious
Marketplaces behind their remote, plugins on an older version, skills behind their git upstream, MCP packages with a newer release. Checked on launch or on your own interval. Update one, or update everything at once.
Turn things off without losing them
Disabling parks a skill or subagent aside instead of removing it, and deleting moves it to the Trash. Trying a leaner setup for a week costs you nothing.
MCP servers without the JSON
User, project, and local scope side by side, plus the servers your plugins bring with them. Add or edit one through a form. Environment variables and headers stay masked on screen and never reach a log.
Your setup stays in your hands
Fettlr shells out to the claude binary wherever a command exists, and writes files itself only where none does. It never signs anything, never installs a background helper, and never deletes a skill outright: removals go to the Trash.
Getting Fettlr onto your Mac.
There is no Apple Developer Program behind Fettlr, so macOS asks you to approve it once. Claude Code can handle the whole thing, or you can do it by hand in three steps.
Let Claude Code install it
Paste this into Claude Code. It picks up the launcher skill, installs Fettlr, walks the approval prompt for you, and opens the app.
Fetch https://fettlr.space.fast/install and follow it to install and launch Fettlr.Or install it by hand
Drag it into Applications
Open the .dmg you downloaded, then drag Fettlr onto the Applications shortcut inside it.
Open it, then allow it
Double-click Fettlr in your Applications folder. When macOS says it "can't verify the developer," click Done, not Move to Trash. Then open System Settings, Privacy & Security, scroll to Security, and click Open Anyway.
Confirm
Authenticate and click Open. macOS only asks once; after that Fettlr launches normally.
Free, and it stays free.
No account, no license key, no paid tier waiting behind the next release. Fettlr is open source: every line is on GitHub. Use it at work, fork it, ship your own build. It asks nothing back.
- Version
- 1.0.2
- License
- MIT
- Requires
- macOS 13 or later
- Architecture
- Apple silicon