Run UPL Prompts

Use this skill to discover and execute prompts written in Universal Prompt Language (UPL).

UPL prompts are .txt or .upl files containing typed parameters, conditionals, loops, and a prompt body. The upl CLI renders a prompt into its final text.

Core rules

1. Always use the JSON-based UPL execution interface.

   • Use upl build-from-json <prompt> <json-file>.
   • Never use upl build, upl b, the interactive browser, or interactive parameter collection.
   • Never manually interpret or render UPL syntax when the CLI is available.

2. Prompt discovery is recursive.

   • The default prompt library is ~/.upl/prompts.
   • Search all nested directories recursively.
   • Recognize both .txt and .upl files.