Expo Brownfield Integration
mweinbach/agent-coworker
Helps add Expo and React Native to an existing native iOS or Android app, and choose between a prebuilt AAR or XCFramework and a fully integrated build.
Diagnoses and fixes slow Kotlin/Native compilation and linking in Kotlin Multiplatform projects that target iOS.
Install Kotlin Tooling Native Build Performance
$ npx skills add Kotlin/kotlin-agent-skills --skill kotlin-tooling-native-build-performance -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install Kotlin/kotlin-agent-skills kotlin-tooling-native-build-performance --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/Kotlin/kotlin-agent-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/kotlin-tooling-native-build-performance .claude/skills/kotlin-tooling-native-build-performance && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "kotlin-tooling-native-build-performance" agent skill from https://github.com/Kotlin/kotlin-agent-skills/tree/main/skills/kotlin-tooling-native-build-performance into .claude/skills/kotlin-tooling-native-build-performance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin-tooling-native-build-performance", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/Kotlin/kotlin-agent-skills/tree/main/skills/kotlin-tooling-native-build-performanceType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add Kotlin/kotlin-agent-skills --skill kotlin-tooling-native-build-performance -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install Kotlin/kotlin-agent-skills kotlin-tooling-native-build-performance --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Kotlin/kotlin-agent-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/kotlin-tooling-native-build-performance .agents/skills/kotlin-tooling-native-build-performance && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "kotlin-tooling-native-build-performance" agent skill from https://github.com/Kotlin/kotlin-agent-skills/tree/main/skills/kotlin-tooling-native-build-performance into .agents/skills/kotlin-tooling-native-build-performance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin-tooling-native-build-performance", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Kotlin/kotlin-agent-skills --skill kotlin-tooling-native-build-performance -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install Kotlin/kotlin-agent-skills kotlin-tooling-native-build-performance --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Kotlin/kotlin-agent-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/kotlin-tooling-native-build-performance .cursor/skills/kotlin-tooling-native-build-performance && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "kotlin-tooling-native-build-performance" agent skill from https://github.com/Kotlin/kotlin-agent-skills/tree/main/skills/kotlin-tooling-native-build-performance into .cursor/skills/kotlin-tooling-native-build-performance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin-tooling-native-build-performance", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/Kotlin/kotlin-agent-skills.git --path skills/kotlin-tooling-native-build-performance--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add Kotlin/kotlin-agent-skills --skill kotlin-tooling-native-build-performance -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install Kotlin/kotlin-agent-skills kotlin-tooling-native-build-performance --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Kotlin/kotlin-agent-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/kotlin-tooling-native-build-performance .gemini/skills/kotlin-tooling-native-build-performance && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "kotlin-tooling-native-build-performance" agent skill from https://github.com/Kotlin/kotlin-agent-skills/tree/main/skills/kotlin-tooling-native-build-performance into .gemini/skills/kotlin-tooling-native-build-performance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin-tooling-native-build-performance", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install Kotlin/kotlin-agent-skills kotlin-tooling-native-build-performanceInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add Kotlin/kotlin-agent-skills --skill kotlin-tooling-native-build-performance -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/Kotlin/kotlin-agent-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/kotlin-tooling-native-build-performance .github/skills/kotlin-tooling-native-build-performance && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "kotlin-tooling-native-build-performance" agent skill from https://github.com/Kotlin/kotlin-agent-skills/tree/main/skills/kotlin-tooling-native-build-performance into .github/skills/kotlin-tooling-native-build-performance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin-tooling-native-build-performance", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add Kotlin/kotlin-agent-skills --skill kotlin-tooling-native-build-performance -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install Kotlin/kotlin-agent-skills kotlin-tooling-native-build-performance --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Kotlin/kotlin-agent-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/kotlin-tooling-native-build-performance .opencode/skills/kotlin-tooling-native-build-performance && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "kotlin-tooling-native-build-performance" agent skill from https://github.com/Kotlin/kotlin-agent-skills/tree/main/skills/kotlin-tooling-native-build-performance into .opencode/skills/kotlin-tooling-native-build-performance/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "kotlin-tooling-native-build-performance", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
kotlin-tooling-native-build-performance- GitHub stars
- 1.1k
- Token cost
- ~2k tokens
- SKILL.md length
- 769 words
- Files
- 7 (incl. scripts, references)
- Skills in repo
- 6
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Diagnoses and fixes slow Kotlin/Native compilation and linking in Kotlin Multiplatform projects that target iOS.
- Works in 3 steps: Classify the Slow Scenario → Audit and Measure → Fix in Safe Order
- The user reports slow iOS
- SKILL.md covers Step 0: Classify the Slow…, Step 1: Audit and Measure, Step 2: Fix in Safe Order and Worked Example, plus 3 more sections
- Runs Shell scripts from its folder
What it does
Kotlin Tooling Native Build Performance is an agent skill from Kotlin/kotlin-agent-skills. Diagnoses and fixes slow Kotlin/Native compilation and linking in Kotlin Multiplatform projects that target iOS. Use when the user reports slow iOS or shared-framework builds, long linkDebug/linkRelease or XCFramework tasks, cold CI builds that re-download the Kotlin/Native toolchain, KSP or other generated code on the native path, transitiveExport usage, or asks for a local-development versus CI build performance plan.
Its SKILL.md is about 2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 9 other files, including scripts and reference files (for example `evals/EVALUATION.md`, `references/artifacts-and-targets.md` and `references/caching-and-gradle.md`).
It sits in Mobile, covering Android development and Cross-platform mobile apps. It works with Kotlin, iOS and Gradle. The repository describes itself as: A collection of AI agent skills useful for projects using Kotlin language. The licence is Apache-2.0.
When your agent uses it
- The user reports slow iOS
- Shared-framework builds
- Long linkDebug/linkRelease
- XCFramework tasks
Example prompts
- “Use the kotlin-tooling-native-build-performance skill to diagnose and fixes slow Kotlin/Native compilation and linking in Kotlin Multiplatform…”
- “/kotlin-tooling-native-build-performance”
Requirements
- A Bash shell
Workflow steps
3 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit c2f9069. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (Shell), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
kotlinlang.org
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Kotlin Tooling Native Build Performance loads about 2k tokens when it runs, and up to ~3.9k if it reads all its reference files. Until then it costs about 116 tokens; SKILL.md has 769 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
The full file from Kotlin/kotlin-agent-skills at commit c2f9069, republished under its Apache-2.0 licence (© Kotlin). 769 words, ~1,985 tokens.
Download SKILL.mdSave it as
.claude/skills/kotlin-tooling-native-build-performance/SKILL.md (or your agent's skills folder). This skill also uses 6 other files; get the full folder from GitHub.- name
- kotlin-tooling-native-build-performance
- description
- Diagnoses and fixes slow Kotlin/Native compilation and linking in Kotlin Multiplatform projects that target iOS. Use when the user reports slow iOS or shared-framework builds, long linkDebug*/linkRelease* or XCFramework tasks, cold CI builds that re-download the Kotlin/Native toolchain, KSP or other generated code on the native path, transitiveExport usage, or asks for a local-development versus CI build performance plan.
- license
- Apache-2.0
- metadata.author
- JetBrains
- metadata.version
- 1.0.0
- metadata.tested_models
- openai/gpt-5.5, openai/gpt-5.4-mini
- metadata.last_eval
- 2026-07-06
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
Run the static audit from the project root:
bash scripts/audit-native-build.sh /path/to/projectIt is read-only and prints
file:linefindings (disabled caches, broad local tasks,transitiveExport, broad KSP configuration, missing CI.konancache), each pointing at the reference file with the fix. Findings are leads, not verdicts — confirm each against project policy.Find the command the user actually waits for: a script, a CI step, or the Gradle invocation inside an Xcode build phase. Optimize that command, not a task you picked yourself.
Run it twice when practical. The first build downloads Kotlin/Native components and fills caches; only the second and later runs are representative. Attribute time per task before blaming the compiler:
properties kotlin.build.report.output=file # writes build/reports/kotlin-build/Gradle's
--scanor--profilework too.If you cannot run the build (no macOS host, no Xcode), analyze logs, build scans, or checked-in metrics instead — and state explicitly that the conclusion is static.
Step 2: Fix in Safe Order
Apply fixes one at a time, re-measuring as you go:
- Restore healthy defaults — remove cache/daemon workarounds, enable
Gradle build and configuration caches, keep
~/.konanwarm in CI, update Kotlin: references/caching-and-gradle.md - Build only what the feedback loop needs — one specific task per loop, correct integration method, justified target matrix: references/artifacts-and-targets.md
- Cut export and generated-code cost — drop
transitiveExport, narrowexport(...), scope KSP work to the native compilations that need it: references/exports-and-generated-code.md - Experimental switches last, with the user's agreement: references/experimental.md
Show full SKILL.md (318 more words)Show less
Worked Example
A developer on an Apple Silicon Mac complains that "every shared-module
change costs 12 minutes". Their loop runs ./gradlew :shared:assembleXCFramework.
A build scan of the second (warm) run shows:
:shared:linkReleaseFrameworkIosArm64 348s
:shared:linkReleaseFrameworkIosX64 341s
:shared:compileKotlinIosX64 96s
:shared:linkDebugFrameworkIosSimulatorArm64 41s
:shared:compileKotlinIosSimulatorArm64 38s
configuration phase 64sReasoning chain:
- The loop is local + debug + warm, but ~690s goes to
linkRelease*— release linking is an order of magnitude slower than debug and only CI needs it. Replace the local command with:shared:linkDebugFrameworkIosSimulatorArm64(or the Xcode embed task if Xcode drives the build). (artifacts-and-targets) - All
iosX64work serves Intel simulators; ask whether the team still supports them before removing the target. (artifacts-and-targets) - 64s of configuration on every run disappears behind
org.gradle.configuration-cache=trueonce trialed. (caching-and-gradle) - Expected loop after the change: ~40s compile + ~40s link on warm builds — confirm by re-running the new command twice and comparing.
- CI keeps
assembleXCFrameworkuntouched; note that explicitly in the report.
Verify
- Re-run the exact baseline command; compare warm build against warm build, not warm against cold.
- Second run with the configuration cache reports it is being reused.
- The local development log no longer contains
linkRelease*,*ReleaseXCFramework, or removed generator tasks. - CI still produces every required release artifact, unchanged.
- Tests pass and the app still runs from Xcode.
-
scripts/audit-native-build.shreports no findings you have not consciously accepted and documented.
Report Your Changes
Close with a short performance note:
- The slow scenario (local/CI, debug/release, cold/warm) and the measured evidence — or a statement that the analysis was static.
- Each change, and why it is safe for release behavior.
- The before/after commands the user can run to confirm the win.
- Remaining tradeoffs: experimental flags enabled, targets removed under a policy assumption, worker limits, or generated-code work deferred.
- Links to the relevant official documentation below.
Official Documentation
| Topic | Link |
|---|---|
| Improving Kotlin/Native compilation time | https://kotlinlang.org/docs/native-improving-compilation-time.html |
| Kotlin Gradle plugin compilation and caches | https://kotlinlang.org/docs/gradle-compilation-and-caches.html |
| iOS integration methods | https://kotlinlang.org/docs/multiplatform-ios-integration-overview.html |
| Direct integration with Xcode | https://kotlinlang.org/docs/multiplatform/multiplatform-direct-integration.html |
| Building final native binaries and XCFrameworks | https://kotlinlang.org/docs/multiplatform/multiplatform-build-native-binaries.html |
| Kotlin/Native binary options | https://kotlinlang.org/docs/native-binary-options.html |
| KSP with Kotlin Multiplatform | https://kotlinlang.org/docs/ksp-multiplatform.html |
© Kotlin, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 6 other files (scripts, references) in skills/kotlin-tooling-native-build-performance of Kotlin/kotlin-agent-skills.
- SKILL.md
- evals/EVALUATION.md
- references/artifacts-and-targets.md
- references/caching-and-gradle.md
- references/experimental.md
- references/exports-and-generated-code.md
- scripts/audit-native-build.sh
Open the folder on GitHubat commit c2f9069
Compare with similar skills
Kotlin Tooling Native Build Performance next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Kotlin Tooling Native Build Performance this skillKotlin/kotlin-agent-skills | 1.1k | — | ~2k | Automated safety check: Pass | Apache-2.0 | |
| Expo Brownfield Integrationmweinbach/agent-coworker | 156 | 2 repos | ~900 | Automated safety check: Notes | Custom licence | |
| Upgrade React NativeShopify/flash-list | 7.2k | — | ~1.9k | Automated safety check: Pass | MIT | |
| Claude Android NinjaDrjacky/claude-android-ninja | 124 | — | ~5.2k | Automated safety check: Pass | Apache-2.0 | |
| Simulator Audio E2Ehyochan/react-native-nitro-sound | 961 | — | ~1.1k | Automated safety check: Pass | MIT | |
| Ksafeioannisa/KSafe | 332 | — | ~17k | Automated safety check: Pass | Apache-2.0 |
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Questions about Kotlin Tooling Native Build Performance
What does Kotlin Tooling Native Build Performance do?
Diagnoses and fixes slow Kotlin/Native compilation and linking in Kotlin Multiplatform projects that target iOS. Kotlin Tooling Native Build Performance is an agent skill from Kotlin/kotlin-agent-skills. Diagnoses and fixes slow Kotlin/Native compilation and linking in Kotlin Multiplatform projects that target iOS.
When should I use Kotlin Tooling Native Build Performance?
Kotlin Tooling Native Build Performance fits situations like: the user reports slow iOS; shared-framework builds; long linkDebug/linkRelease; XCFramework tasks.
How do I install Kotlin Tooling Native Build Performance in Claude Code?
Run `npx skills add Kotlin/kotlin-agent-skills --skill kotlin-tooling-native-build-performance -a claude-code`. Or copy the skill folder (skills/kotlin-tooling-native-build-performance in Kotlin/kotlin-agent-skills) into .claude/skills/kotlin-tooling-native-build-performance in your project. Claude Code loads it when a task matches its description.
How do I install Kotlin Tooling Native Build Performance in Codex?
Run `npx skills add Kotlin/kotlin-agent-skills --skill kotlin-tooling-native-build-performance -a codex`. Or copy the skill folder (skills/kotlin-tooling-native-build-performance in Kotlin/kotlin-agent-skills) into .agents/skills/kotlin-tooling-native-build-performance in your project. Codex loads it when a task matches its description.
Can I use Kotlin Tooling Native Build Performance in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Kotlin/kotlin-agent-skills --skill kotlin-tooling-native-build-performance -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/kotlin-tooling-native-build-performance, .gemini/skills/kotlin-tooling-native-build-performance, .github/skills/kotlin-tooling-native-build-performance and .opencode/skills/kotlin-tooling-native-build-performance in your project.
What does Kotlin Tooling Native Build Performance need to run?
Going by SKILL.md and its folder, Kotlin Tooling Native Build Performance needs a shell for the scripts in its folder. Our summary lists: A Bash shell.
Does Kotlin Tooling Native Build Performance access the network?
SKILL.md names 1 domain. As links in the text: kotlinlang.org. This is read from the text; nothing was executed.
Is Kotlin Tooling Native Build Performance safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Kotlin Tooling Native Build Performance use?
Kotlin Tooling Native Build Performance is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Kotlin Tooling Native Build Performance use?
About 2k tokens (SKILL.md is roughly 7.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.9k tokens, read only when the agent opens those files.
What are the alternatives to Kotlin Tooling Native Build Performance?
Skills that share tags, products or a category with Kotlin Tooling Native Build Performance: Expo Brownfield Integration (mweinbach/agent-coworker, 156 stars), Upgrade React Native (Shopify/flash-list, 7.2k stars), Claude Android Ninja (Drjacky/claude-android-ninja, 124 stars) and Simulator Audio E2E (hyochan/react-native-nitro-sound, 961 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Kotlin Tooling Native Build Performance?
Kotlin (a GitHub organization) maintains it in Kotlin/kotlin-agent-skills, which has 1,074 GitHub stars. The repository holds 6 skills in this directory. The repository was last updated on October 8, 2026.
Source: Kotlin/kotlin-agent-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.