Would be nice to have a variables section. It will serve a way to run something at the beginning of the agent execution and persist (should we allow persisting across sessions?)

Have a top section like:

{"variables": { "name": "{{$uname -a}}" } }

Useful for:

• A heavy operation
• Generating some static ids (eg: uuid for the session)

Current alternative: do this in the system prompt and save to a tmp file, but it is kinda clunky