Gut - use Jev (or any LLM) in regular Elixir control flow

Hi everyone

I released Gut 0.1.0. I wanted a small API for places where an application needs a concrete value, but the input needs subjective judgment. Gut asks an LLM to choose from a fixed set of options, then maps the answer back to the original Elixir value.

For example, you can route a support ticket:

Gut.feel(ticket, "Which team should handle this?",
 billing: "Payments, invoices, and refunds",
 technical: "Product defects and access problems",
 other: "Anything else"
)
#=> {:ok, :billing}

Other examples include classifying sentiment:

Gut.feel(review, "What is the sentiment?", [:positive, :neutral, :negative])
#=> {:ok, :positive}

Scoring urgency or severity:

Gut.feel(messages, "How frustrated is the customer?", 1..5)
#=> {:ok, 4}

Or making a bounded yes-or-no decision:

Gut.feel(report, "Does this need manual review?", [true, false])
#=> {:ok, true}

Gut has a dedicated adapter for Jev, which is a good fit for this kind of evaluation:

config :gut,
 adapter: {Gut.ReqLLM.Jev, model: "typesafe:jev-latest"}

It is not limited to Jev. You can use any model supported by ReqLLM:

config :gut,
 adapter: {Gut.ReqLLM, model: "anthropic:claude-haiku-4-5"}

You can also implement Gut.Adapter to use another provider or evaluation system.

Link to the full source on GitHub:

I would appreciate feedback on the API and any use cases where this could help.