This repository is an IntelliJ Platform plugin that integrates ktlint, the Kotlin linter, into JetBrains IDEs. It runs ktlint automatically on Kotlin files, highlights violations in the editor, provides quick fixes, and supports custom rulesets and baseline files. The plugin is built as a Gradle multi-module project with a dedicated ktlint-lib module that bundles the ktlint engine, and a ktlint-plugin module containing the IntelliJ-specific integration. It uses the IntelliJ Platform Gradle Plugin, convention plugins in build-logic, and a set of shell scripts for release and IDE compatibility checks. Architecturally, the plugin is a standard IntelliJ plugin: it registers an external annotator for real-time diagnostics, a local inspection for batch analysis, and persistent settings components for application and project configuration. It caches baseline violations to avoid re-reporting known issues and loads external ruleset JARs at runtime. The build is automated with GitHub Actions for build verification, UI tests, IDE release checks, and Gradle wrapper updates. The code is written in Kotlin and follows IntelliJ plugin best practices, with JUnit4 tests and a release pipeline that generates plugin descriptions from the README.