references:

• client/plugos/*
• plugs/builtin_plugs.ts lastReviewed: 2026-08-03

SilverBullet at its core is bare bones in terms of functionality, most of its power it gains from plugs and Space Lua.

Plugs are an extension mechanism that runs “plug” code in the browser using web workers.

Plugs can hook into SB in various ways:

• Define new commands and keybindings
• Respond to various events triggered either on the server or client-side
• Run recurring and background tasks.
• Define their own extension mechanisms through custom events

Each plug runs in its own sandboxed environment and communicates with SB via syscalls that expose a vast range of functionality. Plugs can be loaded, unloaded, and updated without having to restart SilverBullet itself.

These days, plugs are distributed as assets attached to libraries, ending in a file name with .plug.js.

Available plugs

You can discover libraries and plugs via the SilverBullet ‘Plugs and Libraries’ or through Configuration Manager#Libraries.

Development

Want to develop your own plugs? Have a look at Plugs/Development.