Variables

Variables are reusable pieces of text or dynamic placeholders.

Variables 1 are found below Prompts in the left pane, or via the Variables tab.

Purpose

Variables make your prompts dynamic and adaptable, allowing them to work with different inputs and contexts without needing manual changes each time.

Built-in Variables

Kerlig comes with built-in dynamic and static variables. Some examples:

• currentDate: Current date e.g. "June 30, 2025".
• focusedApp: Name of the app from which Kerlig has been launched e.g. "Google Chrome.app".
• selectedText: Text that was selected in the focused app.
• clipboardText: The text content in the clipboard.
• willResetContext: Resolves to true if there are no previous messages in the current context or previous action had "Create new context" set to true.
• lastAssistantMsg: Represents the previous response from the AI.
• presetAboutMe: Text that is in the Preset under "Information about you".
• presetResponseInstructions: Text that is in the Preset under "How would you like models respond".
• languageVarantGuard: A variable intended to help maintain the language and variant of the output consistent with the input.

Dynamic vs. Static Variables

Content of dynamic variables is only known at the time of running an action, for example currentDate or clipboardText, while static variables can be set directly in the Settings.

Customizing Variables

You can create your own variables 2 for frequently used text snippets or specific data points, and edit 3 existing variables.

Usage

Insert variables into your System Prompts or User Prompts using double curly brackets: {{ variableName }}.

You can also put simple JavaScript inside double curly brackets. Here are a few examples:

OR operator ||

{{ lastAssistantMsg || selectedText }}

This simply means that if lastAssistantMsg exists, it will be used, but if it doesn't, then selectedText will be used.

Alternatively the same can be achieved using the conditional (ternary) operator:

{{ lastAssistantMsg ? lastAssistantMsg : selectedText }}

Upper case toUpperCase()

{{ selectedText.toUpperCase() }}

This will convert the selectedText to upper case, for example from "Hello!" to "HELLO!". Learn more about String object.↗

Custom date

{{ new Date().toUTCString() }}

This will return the current date in a standardized format, for example: "Fri, 30 May 2025 09:24:39 GMT". Learn more about Date object.↗