promptfoo

Hi guys.

I have some skill I'd like to evaluate with Promptfoo.
The structure looks like this
```
.
├── references
│   └── workflows
│       ├── sub-task-a.md
│       ├── sub-task-b.md
│       └── sub-task-c.md
└── SKILL.md
```

The skill has roughly 5 steps.
First, it needs to decide which reference file to use based on the user prompt to execute a certain sub-task.
The last step would call some `curl` command to validate the generated results is valid or not.

My questions:
1. How should I configure promptfoo to verify that the right reference file is used for a given prompt?
2. How should I assert that `curl` command?

Currently, I use custom provider with tracing enabled to verify the `curl` command and its payload.
I'd like to learn from the community how would you guys do these evaluations.
Thank you in advanced.