Enable Flow Step Callable Agents to accept tokens as inputs

The version 1 of the flow step callable agents is really great.  However, the functionality is very limiting for two reasons (one is the subject of this idea)

• The limit of a 4000 character prompt (you should be allowed to reference longer-form context for agent decison-making)
• The inputs/outputs in the Coworker tool are fixed.  

Please enable the callable agents to be flexible in what fields/tokens are providing input.   For example.

Agent setup:  accept jobtitle value and email value. 

In flow step

Call agent (parameters):  jobtitle is {{lead.job title}}, email is {{lead.secondary email address}}

Enable the flow step to pass tokens in, so that different versions of the agent do not have to be created in order to send data from different fields, for the same use, into the callable agents.