> ## Documentation Index > Fetch the complete documentation index at: https://docs.quarkle.ai/llms.txt > Use this file to discover all available pages before exploring further. # Building a Custom AI Editor for Your Genre > How to build a custom AI reviewer tuned to your genre, a worked example: a fantasy world-consistency checker, built step by step. The built-in reviewers cover the fundamentals: grammar, clarity, structure, voice. Every genre has its own concerns a generic editor won't catch. This guide builds one, start to finish. ## Start from a template or blank In the **Review** tab, click the **+** to open the new-reviewer drawer. You can start from a template like Hemingway or Worldbuilding, or build entirely from scratch. The new-reviewer drawer with templates and fields for name, tier, description, instructions, and examples ## A worked example: a world-consistency checker Say you're writing fantasy and want to catch a magic rule or a piece of geography contradicting something from three chapters ago, not grammar. No built-in reviewer does that. Here's how to build one that does. Something specific: **World Consistency Checker**, not just "Consistency." This is a structural concern, not a line-level one, so **Developmental** is the right tier: it judges the story, not the sentences. This is what surfaces under the name in the panel: `Flags contradictions in magic rules and world lore`. Vague instructions get vague comments. Be concrete about what to check and what NOT to do: `Check every mention of magic, geography, or timeline against the Story Atlas. Flag it, don't rewrite prose.` The new reviewer form filled in with a World Consistency Checker: name, Developmental tier, description, and instructions Notice the instructions say "don't rewrite prose." A consistency checker's job is to flag a contradiction, not fix it, that decision is yours. What a reviewer should *not* do is as worth specifying as what it should. ## See it live in your panel Once you save it, your reviewer appears in its tier alongside the built-in ones, and runs the same way: toggle it on, and it joins the next review you run. The Review Room's Developmental tier showing the newly created World Consistency Checker reviewer, marked custom and toggled on Look for the **custom** badge next to a reviewer's name any time you want to spot the ones you've built. ## Iterate on your reviewer The first version of a custom reviewer is rarely the last. After a review run, look at what it actually flagged: * **Too noisy?** Narrow the instructions. "Check every mention of magic" might need to become "check only magic *system* rules, not incidental references to spells." * **Missing things?** Add an example or two under **Examples**. A couple of good input-to-rewrite pairs teaches the reviewer your specific standard faster than more prose in the instructions. * **Wrong tier?** Edit it and move it. A reviewer that's really about voice belongs in Line, not Developmental, regardless of where you first put it. Reviewers are saved to your account, so once one earns its place, it's available on every manuscript you write, not just this one. Get your manuscript out of Quarkle and in front of readers.