Accepting filters for function calls

**Is your feature request related to a problem? Please describe. **
I saw a 'TODO:' in the source code (base_flow.go lines 363) for filtering function calls, I would like to check how would the function calls in the filter be defined? Through the agent dynamically generating it or through user definition or another way I have not thought of.

**Describe the solution you'd like**
I hope to have a clear idea on how the filters will be defined, in order to build the filter as well as the filter acceptance functionality.

**Additional context**
I have just started using and learning this project recently, hoping to contribute in some way 😀

Start with the TODO at base_flow.go line 363 and inspect the surrounding function-call filtering flow. Determine whether filters are agent-generated or user-defined, then document the agreed filter definition and acceptance behavior; the issue does not mention a test file.

Written by the indexing model from the issue text.