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kotlin-tooling-kotlin-toolchain-plugin-authoring

Load when authoring, writing, or designing a Kotlin Toolchain local plugin to extend the declarative build with code generation, build-time processing, custom verification, or packaging that module.yaml cannot express, or when referencing @TaskAction, @Configurable, plugin.yaml, or jvm/amper-plugin. Skip for porting an existing Gradle plugin.

skills/kotlin-tooling-kotlin-toolchain-plugin-authoring/SKILL.md

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# Kotlin Toolchain Plugin Authoring

Local plugins are the official escape hatch from declarative YAML: a `jvm/amper-plugin` module shipping
task actions, settings, and generated sources/resources alongside your project. Code patterns to adapt are
in [references/examples.md](references/examples.md).

## When to write a plugin

Write one when you need:

- A build-time step a library's workflow expects (code generation, schema compilation, resource
  transformation, version stamping).
- Custom verification wired into the build (pre-release checks, schema validation, contract tests).
- A build-time value published into the JAR classpath or downstream tasks — the closest analog to Gradle's
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