Enhancement: Dynamic prompt/instruction building for agents

[acehoss]

What features would you like to see added?

Related to #5006, a way to pre-populate the context/instructions with dynamic information, but more generally.

More details

I'm envisioning some sort of capability to inject dynamic information into the instruction prompt, perhaps using an action or something like it. A very simple approach to start with would be to configure an action that runs on every prompt, perhaps with the result being put into a template variable or something.

I'm coming from using SillyTavern to build agents, which has some pretty powerful context management features that inject pieces of data from various sources into the prompt using a recursive set of regex triggers to activate world info entries. Though SillyTavern was built for roleplaying, I found that the toolset worked very well for building agents with tools and memory. But its heritage as roleplaying software means that it lacks considerations needed for proper enterprise deployment.

Looking at model context protocol host support which is already in development, probably be done with MCP Resources or Prompts. #4876

Which components are impacted by your request?

General

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