> ## Documentation Index
> Fetch the complete documentation index at: https://fuguai.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Cookbooks

> Four real problems worked through with hunch, each with its spec, its numbers, and what did not work.

Each cookbook starts from a real dataset and a question someone would want answered about it. It shows the spec, what was run, what came out, and where the approach fell short. Every number comes from a run in the repository: the example specs are in `prototype/examples/`, and the design notes behind them in `docs/04-design.md`.

<CardGroup cols={2}>
  <Card title="Grade Claude Code sessions" icon="robot" href="/cookbooks/claude-code-sessions">
    Did each turn work? About 90% right against reviewers, and `diff` caught a wording change that made it worse.
  </Card>

  <Card title="Guard a coding agent's commands" icon="shield-halved" href="/cookbooks/command-guard">
    Stops 11.6% of 1,315 real commands and lets through an estimated 1% (0.2–6%) that needed a person.
  </Card>

  <Card title="Route banking intents" icon="building-columns" href="/cookbooks/banking-intents">
    77 intents. The answer key turned out to be wrong more often than the model.
  </Card>

  <Card title="Predict whether a patch passes" icon="code-pull-request" href="/cookbooks/swe-patches">
    A confident "no" is reliable; a confident "yes" is not.
  </Card>

  <Card title="100,000 product reviews" icon="gauge" href="/cookbooks/amazon-reviews">
    57.5 requests per second, \$1.55, and a cached re-run in 4 seconds.
  </Card>
</CardGroup>

The same specs on a second engine are compared in [Engines](/reference/engines); automatic rewrites with `hunch suggest` are in [Change a spec](/guides/change-a-spec).

## Not yet

* No one outside the project has used hunch.
* The review panels were AI reviewers working from each row alone. The own-session reviews were by the developer who wrote the sessions. Neither is an independent human panel.
* `suggest` has not produced a rewrite that beat hand-written option descriptions.
* The server has only run locally.