> ## Documentation Index
> Fetch the complete documentation index at: https://docs.meridian.surf/llms.txt
> Use this file to discover all available pages before exploring further.

# Command flow

> Action blocks for command flow in the Meridian builder.

Blocks tied to slash commands, prefix commands, and context menu entry points. The Command and Error handler nodes are always present on command canvases.

Categories mirror the builder block palette. Search the palette or use the links below to jump to a specific block.

## Blocks

* [Command](/builder/action-blocks/command-flow/command-start) — Starts when someone runs this slash command, prefix command, or context menu action.
* [Error handler](/builder/action-blocks/command-flow/command-error-handler) — Runs when this command throws or fails.
* [Command option](/builder/action-blocks/command-flow/command-option) — A Discord slash command parameter attached to the Command block.