Your agent says it's done. Jetty checks its work.

Jetty runs AI workloads from plain-language instructions called runbooks. Each workload runs in a sandbox, paired with a coding agent, a model and the integrations it needs. You provide an objective and define the evaluation criteria; Jetty puts together the steps to produce the outcome, records every run, and lets you evaluate and share the results from the web interface. The product overview walks through the full loop: author, run, investigate, improve.

Chasing a “best” model on a leaderboard is a waste of time. The model that matters is the one that performs on your task, your budget, and your skill. Public leaderboards and benchmarks are usually far too generic to indicate actual performance in your environment. They are also costly to run, and important details are usually left out of the rankings. Jetty is model-agnostic by design, so you can launch your own investigations with your own agent and model pair and let your own eval suite decide.

Researchers keep diaries and maintain results over weeks and months to build good intuition. Good news: with Jetty your runs are already organized for evaluation. Every config is stored automatically, so nothing gets lost. Read the failure modes each run kicks back and use them for the next iteration. You can launch hundreds of jobs, close your laptop, and come back to real answers instead of a mountain of logs sitting on your machine.

A test answers one narrow question: does this match the expected output? Pass or fail, done. That’s fine for deterministic code, but it’s not enough for agents. An eval answers the question that actually matters: is this good? Does the agent use the skill right, reason well, get the job done? It is judged across dozens or hundreds of runs, not just one. Tests catch what’s broken, evals show you what’s working and how much better it’s getting each round, and these days you need both.

AI agents need different kinds of checks, and one kind of evaluation can only answer one kind of question. As AI workloads get longer, they often need several guard rails to keep them on task. Jetty handles this by letting you set standards as code checks, checklists and judges.

Code checks are often necessary, but not sufficient, for good-quality agent outputs. Did the output render? Did the report include citations? Did the video run at 24 fps? A code check doesn’t rely on a model to test the output.

Some things the agent should confirm before it is done, like checking the names on every flagged receipt or making sure every cell in a table is filled in correctly. That is a checklist. It stops the agent quitting early, but it only guards against errors you already know about.

A judge evaluates what a code check can’t touch: did the agent solve the right problem, write something maintainable, make a sane tradeoff when the spec was ambiguous? Judges work best across many runs as part of a broader investigation.

Together, these evaluation tools set the standard for your agents.