# PR Description
This PR introduces a new environment variable `ARCADE_DISABLED_TOOLS`.
Tools that are added to this env var are not added to the worker's
`ToolCatalog`. In effect, they are disabled for the worker.
## How to use the `ARCADE_DISABLED_TOOLS` environment variable
* Each tool is separated by a comma.
* For each tool, specify the toolkit name in camel case and the tool
name in camel case.
* Do not include versions. (This is a simple implementation. We can add
disabling specific versions in the future if needed)
* Separate the toolkit name and the tool name with your environment's
tool name separator. By default, the tool name separator is `.`, but you
can override this with the `ARCADE_TOOL_NAME_SEPARATOR` environment
variable.
Correct: `export
ARCADE_DISABLED_TOOLS="Math.Add,Spotify.GetAvailableDevices,Math.Sqrt"`
Incorrect: `export
ARCADE_DISABLED_TOOLS="Math.Add@0.1.0,Spotify.get_available_devices,Sqrt`
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