Kotlin/kotlin-agent-skills is a collection of packaged instructions, scripts, and resources that help coding agents handle projects written in Kotlin. It is for developers using Kotlin, with skills covering areas such as backend frameworks and build tooling. The catalogue entries are the individual Kotlin-focused skills distributed from the repository.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Kotlin/kotlin-agent-skills --skill kotlin-tooling-native-build-performancegit clone --depth 1 https://github.com/Kotlin/kotlin-agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/kotlin/kotlin-agent-skills/kotlin-tooling-native-build-performance)<a href="https://agentmods.dev/skills/kotlin/kotlin-agent-skills/kotlin-tooling-native-build-performance"><img src="https://agentmods.dev/badge/skills/kotlin/kotlin-agent-skills/kotlin-tooling-native-build-performance/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/kotlin/kotlin-agent-skills/kotlin-tooling-native-build-performance"><img src="https://agentmods.dev/badge/skills/kotlin/kotlin-agent-skills/kotlin-tooling-native-build-performance.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00096 | $0.01875 |
| Opus 5 | $0.00048 | $0.00937 |
| Sonnet 5 | $0.00019 | $0.00375 |
| Haiku 4.5 | $0.00010 | $0.00187 |
Grade A, and why
kotlin-tooling-native-build-performance scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 155 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Kotlin/Native Build Performance
Turn "the iOS build is slow" into a measured diagnosis and a small set of safe fixes. Two rules apply throughout:
- Never trade away required release behavior. A faster local loop must not change what CI publishes.
- Measure before and after with the same command and the same build state. An unmeasured fix is a guess.
Step 0: Classify the Slow Scenario
Establish four facts before editing anything: where (local or CI), what (debug feedback loop or release/distribution artifact), state (first build, clean, warm, or no-op), and phase (which tasks dominate the log). Then match the dominant symptom:
| Symptom in the build log | Likely cause | Read |
|---|---|---|
linkRelease* or *ReleaseXCFramework tasks in a local development loop |
Building distribution artifacts for development | artifacts-and-targets |
| Kotlin/Native compiler distribution downloaded on every CI run | ~/.konan not preserved between runs |
caching-and-gradle |
| Long pause before the first task starts | Configuration phase, no configuration cache | caching-and-gradle |
| All iOS targets build when only one simulator is needed | Broad task (build, assemble, assemble*XCFramework) or unused targets |
artifacts-and-targets |
ksp* tasks ahead of compileKotlinIos* |
Generated-code work on the native path | exports-and-generated-code |
| Small source edit recompiles and relinks everything | Compiler caches disabled, or missing incrementality | caching-and-gradle, experimental |
Machine overloaded while several link* tasks run at once |
Parallel native linking | caching-and-gradle, worker-limit caveat |
Step 1: Audit and Measure
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 155 lines · 96 tokens per session scan A 948fcecafa9f
kotlin-tooling-native-build-performance is a skill published in the GitHub repository Kotlin/kotlin-agent-skills (1,039 stars, last pushed 18d ago), licensed Apache-2.0. It adds 96 tokens to every session and 1,875 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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