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We also use dokka and kotlin serialization in the child project. It also errors with

org.gradle.api.plugins.UnknownPluginException: Plugin [id: 'org.jetbrains.dokka'] was not found in any of the following sources

if we don't have

id 'org.jetbrains.dokka' version "1.7.10" apply false

in the parent project's

build.gradle

. Is there a way to avoid that as well?

Builds aren't meant to be composed as subprojects: settings.gradle.kts is ignored, gradle/libs.versions.toml too (as the conventional path for version catalog). In your case you could probably have the Parent settings.gradle.kts configure the version catalog to load the Child/gradle/libs.versions.toml file; but I'd rather look at composite builds (

includeBuild

) as that's the proper way to compose builds together in Gradle.

Thanks!