What this skill does
Writes, debugs, and reviews Kotlin: coroutines and flows, null safety, collections, Java interop, and Compose state. Use when an NPE hits a non-null type, `!!` or a Java platform type blows up, a coroutine leaks, never cancels, or swallows exceptions, a StateFlow stops emitting or a SharedFlow drops events, a Compose screen recomposes too much or loses state on rotation, `equals`/`copy`/`==` behave unexpectedly, a `when` stops being exhaustive, kapt/KSP or JVM-target errors break the Gradle build, JSON puts null into a non-null property, a coroutine test hangs or passes only in isolation; also when porting Java to Kotlin, sharing code across Android/iOS/JVM, tuning allocation and inlining, or writing server-side Kotlin with Spring or Ktor. Not for Java-only codebases or Android release/build-system configuration.
Kotlin is part of the Developer Tools category — developer tools that help your agent write, review, debug, and ship code. You can install it on its own or alongside other developer tools skills from the OpenClaw catalog.
How to install Kotlin
The easiest path is via the OpenClaw Easy desktop app — one click, no terminal required:
- Download OpenClaw Easy for macOS or Windows (free, one-click installer, ~30 seconds).
- Open the in-app Skills panel.
- Search for
kotlinand click Install. - The skill activates automatically when an incoming message matches its description.
Install from the command line
If you already run the OpenClaw CLI, add Kotlin with a single command:
openclaw skills add kotlin
This pulls kotlin from ClawHub and installs it into ~/.openclaw/skills/kotlin/. Restart the OpenClaw gateway afterwards so the new skill is discovered.
How to use Kotlin
Once installed, Kotlin activates on its own: when an incoming message on WhatsApp, Telegram, Slack, Discord, Feishu or Line matches the skill's description, your OpenClaw agent loads it and runs the workflow. You can also trigger it explicitly by describing the task in chat. No extra configuration is required after install.
Manual install (advanced)
If you prefer manual installation:
- Click the Download .zip button above to grab
kotlin-1.0.3.zipdirectly from our S3 mirror. - Unzip into
~/.openclaw/skills/kotlin/(create the directory if it does not exist). - Restart OpenClaw Easy (or the OpenClaw CLI gateway) so the new skill is discovered.
Frequently asked questions
How do I install Kotlin?
Install Kotlin in the OpenClaw Easy desktop app by opening the Skills panel, searching for kotlin, and clicking Install. From a terminal you can run: openclaw skills add kotlin. Either way the skill is placed in ~/.openclaw/skills/kotlin/.
Is Kotlin free?
Yes. Kotlin is free and open-source, distributed under the Apache-2.0 license through ClawHub. No account or payment is required to download or run it.
What does Kotlin do?
Writes, debugs, and reviews Kotlin: coroutines and flows, null safety, collections, Java interop, and Compose state.
Related: more developer tools skills
If Kotlin looks useful, you may also want to check out other developer tools skills in the OpenClaw catalog:
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Free, open-source · Apache-2.0 · Works with Claude, ChatGPT, Gemini, or local Ollama models