Like we’ve mentioned on the gists page, variables are placeholders in prompt templates.

Variable format

Gist variables are wrapped in double curly brackets:
{{variable}}

Variable names rules

The variable name must starts with a letter and can only contain lowercase letters, numbers, and underscores:
{{1variable}} # ❌
{{variable-1}} # ❌
{{Variable-1}} # ❌
{{variable_1}} # ✅
{{variable1}} # ✅
In addition, there must be no spaces between the variable name and the curly brackets:
{{ variable }} # ❌
{{variable}} # ✅