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](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 Library|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](Configuration Manager#Libraries).

Development

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