{"slug":"margelo-kotlin","name":"kotlin","description":"Design, implement, and review Kotlin and Android APIs. Use when working on .kt files, Kotlin nullability, sealed classes/interfaces, coroutines, Android threading, Java interop, or Kotlin-backed React Native Nitro Module implementations.","long_description":"---\nname: kotlin\ndescription: Design, implement, and review Kotlin and Android APIs. Use when working on .kt files, Kotlin nullability, sealed classes/interfaces, coroutines, Android threading, Java interop, or Kotlin-backed React Native Nitro Module implementations.\n---\n\n# Kotlin\n\nUse this skill for Kotlin code that needs strong type modeling, explicit async boundaries, and idiomatic Android integration. When the code is part of a Nitro Module, pair this with `build-nitro-modules` for generated specs, Promise mapping, annotations, and HybridObject constraints.\n\n## Workflow\n\n1. Read the local Kotlin code, generated abstract classes, and public API shape before editing.\n2. Model valid states with Kotlin types before implementing behavior.\n3. Choose whether work is synchronous, coroutine-based, or explicitly dispatched.\n4. Keep properties cheap and nonblocking.\n5. Make thread hops, Android service access, I/O, and fallible work visible in the API.\n\n## Type-Safe API Design\n\n- Represent state variants with sealed interfaces/classes, normal interfaces, or concrete classes. Do not encode variants as one data class with many nullable fields.\n- Keep related values non-null on the variant where they are valid. If `barcode` and `barcodeType` must exist together, put them on `ScannedBarcode`.\n- Use nullable types for real absence inside one state, not for \"maybe this object is a different kind of thing\".\n- Prefer compile-time narrowing over caller-side null probing. Repeated null checks for related fields usually mean the model is too loose.\n\n```kotlin\n// Avoid: related fields are nullable and the valid combinations are implicit.\ndata class ScannedData(\n  val position: Point,\n  val text: String?,\n  val barcode: String?,\n  val barcodeType: BarcodeType?,\n  val face: Rect?,\n)\n\n// Prefer: each variant exposes only the fields that are valid for it.\nsealed interface ScannedData {\n  val position: Point\n}\n\ndata class ScannedText(\n  override val position: Point,\n  val text: String,\n) : ScannedData\n\ndata class ScannedBarcode(\n  override val position: Point,\n  val barcode: String,\n  val barcodeType: BarcodeType,\n) : ScannedData\n\ndata class ScannedFace(\n  override val position: Point,\n  val face: Rect,\n) : ScannedData\n```\n\n## Async and Threading\n\n- Use coroutines for naturally suspending APIs and Android I/O that already has coroutine support.\n- Keep quick, deterministic, local work synchronous. Do not introduce coroutines, dispatchers, or Promise plumbing for simple value construction, cached metadata, or pure transforms.\n- Use explicit owned dispatchers/scopes or Nitro `Promise.parallel` for CPU-bound synchronous work that should not run on the caller thread.\n- Avoid the main dispatcher unless the Android API requires it, such as view/UI mutation or lifecycle APIs. Keep main-thread blocks small and move parsing, conversion, I/O, session negotiation, and CPU work to an owned dispatcher or async API.\n- Do not use `runBlocking` in library code, property getters, setters, or JS-facing entry points.\n- Do not hide a thread hop, service lookup, blocking I/O, permission flow, or fallible native operation behind a property.\n- If a value is emitted by a specific Android callback/thread, prefer a listener, Flow, or event API. In Nitro specs, expose a listener or a `Promise<T>` method.\n- Treat repeated `launch`, `withContext`, dispatcher, handler, or executor hops as an architecture smell. A component should either own the coroutine scope/dispatcher/lifecycle it works on, or cross into that owner once at the public async boundary or native callback boundary.\n- If a workflow bounces between main, IO, default, native, and JS/Nitro contexts in multiple nested places, stop and redesign the object/lifecycle/API. Excessive hops hide latency, make ordering harder to reason about, and create future performance problems.\n- Do not fix races or readiness bugs with `delay`, `Thread.sleep`, `Handler.postDelayed`, timers, extra dispatcher hops, or calling the same method twice. Fix the owner dispatcher/lifecycle, state machine, callback/event, Flow, or async API boundary instead. Retry only for external nondeterminism such as hardware, OS services, remote services, or network, and keep retries bounded, cancellable, and idempotent.\n- Keep mutable shared state owned by one coroutine scope, dispatcher, lock, or Android component lifecycle. Avoid mixing ownership models without a clear boundary.\n- Treat `Mutex`, `synchronized`, and `ReentrantLock` as last-resort synchronization, not default listener or callback plumbing. Before adding one, identify the exact shared mutable values, concurrent callers, and why a single owner dispatcher/lifecycle, channel/Flow, or immutable snapshot is not enough.\n- Never hold a lock while invoking callbacks, calling into JS/Nitro, or calling unknown user code. Snapshot listeners under the lock if needed, unlock, then call them. A listener removed during an in-flight emission may receive that current event.\n\n## Properties\n\n- Use `val` and `var` for cheap in-memory state or derived values.\n- Use methods for side effects, I/O, Android service calls, permission checks, allocation, blocking work, or operations that can fail.\n- If a property would need to wait for another thread, redesign it as an async method or event.\n\n```kotlin\n// Avoid: blocking work hidden in a getter.\nval status: SessionStatus\n  get() = runBlocking { session.status() }\n\n// Prefer: make the async boundary explicit.\nfun getStatus(): Promise<SessionStatus> {\n  return Promise.async {\n    session.status()\n  }\n}\n```\n\n## Kotlin Style\n\n- Make classes final by default. Kotlin classes already are final unless marked `open`; keep them that way unless inheritance is intentional.\n- Prefer `data class` for plain values and regular classes for owned resources or lifecycle.\n- Prefer `sealed interface` or `sealed class` for closed result families.\n- Use `require`, `check`, or specific exceptions for invalid inputs and invalid state. Do not silently no-op user-reachable failures.\n- Keep Java interop explicit. Convert platform types into Kotlin types before exposing them through the public API where practical.\n- Avoid `!!` except at narrow boundaries where a prior check makes the invariant obvious. Prefer early returns, `requireNotNull`, or typed state.\n- Prefer explicit `return` statements inside multi-line control flow. Do not lift the return outside a multi-line `try`/`catch`, `if`, `when`, or lambda just to make it expression-like; use `try { return value } catch (...) { return fallback }`.\n- In multi-line lambdas, use labeled returns such as `return@map value` for the result. Omit the label only for true single-expression lambdas like `items.map { it.toString() }`; do not write `items.map { return@map it.toString() }`.\n- Prefer inline shorthand for unambiguous single-expression lambdas: `formats.map { it.toMLKitFormat() }`, not a multi-line `map { format -> format.toMLKitFormat() }`. Do not use `it` when a surrounding or nested lambda already uses `it`; name parameters in nested lambdas or when clarity needs it.\n- Treat a filename as a scope contract. `HybridDataScanner.kt` should implement `HybridDataScanner`; it should not also contain Android helpers, geometry conversions, listeners, or extension utilities.\n- Keep one top-level implementation type per file. Do not put secondary classes, interfaces, enums, option adapters, coordinators, delegates, or helper types below the primary type. If a helper deserves a type, it deserves its own file.\n- Keep one focused extension/conversion per file. Do not create a catch-all extension file just because every helper is an extension. Split conversions into named files such as `Barcode+toScannedCode.kt`, `TargetBarcodeFormat+toMLKitFormat.kt`, and `BarcodeFormat+fromMLKitBarcodeFormat.kt` with `internal` visibility where appropriate.\n- Never put extension `fun`, `val`, or `var` declarations inside `Hybrid*` implementation files or other primary implementation files, even when they are private, tiny, or only used by that file. Put every extension in a separate named `Type+operation.kt` extension/converter file so code splitting, maintainability, and future diffs stay clean.\n- Do not place private top-level extension properties/functions below a primary class just because Kotlin allows it. Companion extensions, enum/platform mappings, barcode format conversions, and ML Kit/CameraX adapters belong in their own named files.\n- Use private top-level helpers in the same file only when they are tiny, non-extension functions/properties, and exist solely to support that file's primary type.\n- Extract Android preflight checks and platform boilerplate out of `Hybrid*` factories and implementation methods. Permission checks, manifest feature/permission validation, `PackageManager` capability checks, service availability checks, and similar setup guards belong in focused helper files; the HybridObject call site should stay one or two lines.\n- Do not create broad `Utils.kt` files for these helpers. Name the file after the platform type or domain check and keep each helper focused on one behavior.\n- Use line count as a review signal: files below roughly 300 lines are usually fine only after the one-type-per-file and no-helpers-in-factory rules are satisfied. Size caused by helpers, conversions, or Android glue is a design issue.\n- Put conversions on the element type, not on `List` or array types, when the conversion only reads one element. Prefer `TargetBarcodeFormat.toMLKitFormat()` plus `formats.map { it.toMLKitFormat() }` at the call site over `Array<TargetBarcodeFormat>.toMLKitFormats()`.\n- Do not put domain conversions on broad/common receivers such as `Int`, `String`, `Double`, or `Any`, even privately. Prefer the domain type's companion/factory direction, such as `BarcodeFormat.Companion.fromFormat(format: Int)`, over `Int.toBarcodeFormat()`.\n- Add collection extension functions only when the collection has real domain behavior, such as validation across elements, deduplication, ordering, batching, caching, nonempty checks, or error aggregation. If the receiver is a concrete `Array<SomeDomainType>` or `List<SomeDomainType>` and the body is mostly `map { ... }`, keep it in caller code.\n- When a Kotlin converter returns or accepts Android platform `Int` constants, apply the matching AndroidX/Java/Kotlin annotation where the API supports it, such as a CameraX `@ImageCapture.FlashMode`-style annotation on the function, return value, or parameter. Check the annotation target and retention before placing it; do not annotate blindly when the platform API exposes only a plain `Int`.\n- When converting from an annotated platform `Int`, put the annotation on the `format: Int` parameter if the annotation target supports parameters. For example, prefer `BarcodeFormat.Companion.fromFormat(@SomeBarcodeFormat format: Int)` over an untyped primitive input.\n\n## Nitro Notes\n\n- Kotlin HybridObject implementations must extend the generated `Hybrid*Spec` class and include `@Keep` plus `@DoNotStrip`.\n- Use `Promise.async` for suspending or I/O work and `Promise.parallel` for CPU-bound synchronous work.\n- Avoid manually creating or passing around `Promise<T>` instances. Prefer `Promise.async`, `Promise.parallel`, `Promise.resolved`, and `Promise.rejected`; use a manual Promise only for real native completion/listener/callback bridges that cannot be wrapped as suspend APIs.\n- For general callback APIs such as Google `Task<T>`, first write a generic suspend adapter in its own extension file, such as `Task+await.kt`, then call it from `Promise.async { task.await() }`. Do not hand-wire `addOnSuccessListener`/`addOnFailureListener`/`addOnCanceledListener` into public HybridObject methods.\n- Use `Promise<Unit>` for `Promise<void>`.\n- Access `NitroModules.applicationContext` lazily and fail explicitly if it is unavailable.\n- Generated properties are synchronous JS entry points. Redesign them as methods or listeners if they need Android","tagline":"Design, implement, and review Kotlin and Android APIs. Use when working on .kt files, Kotlin nullability, sealed classes/interfaces, coroutines, Android threading, Java interop, or Kotlin-backed React Native Nitro Module implementations.","category":"design-creative","tags":["agent-skill"],"author":"margelo","verified":false,"attribution":{"status":"registry_indexed","statusLabel":"Registry indexed","shortLabel":"REGISTRY INDEXED","sourceLabel":"recursive skill source sync","sourceDetail":"margelo/react-native-skills","creatorName":"margelo","creatorUrl":"https://github.com/margelo","sourceUrl":"https://github.com/margelo/react-native-skills/tree/main/skills/kotlin","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/margelo-kotlin#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. Creators can claim the listing to update ownership signals."},"stats":{"stars":161,"forks":7,"verified_installs":0,"successful_runs":0,"total_outcomes":0,"rating":0,"review_count":0,"quality_score":38.72},"quality":{"score":64,"tier":"promising","label":"Promising","summary":"Useful candidate, but compare it with alternatives before adopting.","signals":[{"label":"GitHub stars","value":"161","tone":"neutral"},{"label":"Freshness","value":"1d ago","tone":"positive"},{"label":"Install ready","value":"Yes","tone":"positive"},{"label":"License","value":"Unknown","tone":"neutral"}],"warnings":["The repository license is unknown, which may raise concerns about usage rights and redistribution."]},"trust":{"version":"trust-score-v5","score":61,"base_score":69,"outcome_confidence":0,"tier":"review","label":"Sandbox only","summary":"Useful candidate with missing or mixed trust signals. Keep it in an isolated workspace until the outcome loop proves task fit.","recommendedAction":"Run only in a sandbox and compare close alternatives before using it for real work.","decision":{"install_policy":"human_review_before_install","auto_install_allowed":false,"human_review_required":true,"sandbox_first":true,"agent_action":"Compare alternatives before installing.","reasoning":["61/100 Trust Score v5","69/100 Trust Score v4 baseline","Needs more real agent outcomes before unattended install","Install path is available","Review before production"],"review_required_when":["The workspace contains production secrets, payments, private customer data, or irreversible actions.","The install command requests shell, network, credential, database, or broad filesystem access.","Outcome evidence is missing, recently failed, or required human review.","Production credentials, payments, or irreversible account changes without explicit human review","Sensitive private data before reviewing repository code, license, and permission surface","Automatic installation in a production workspace"]},"dimensions":[{"id":"github_adoption","label":"GitHub adoption","score":62,"weight":0.13,"status":"info","detail":"161 GitHub stars"},{"id":"repo_activity","label":"Stars/forks activity","score":51,"weight":0.08,"status":"warn","detail":"161 stars, 7 forks; issue activity unavailable in current metadata"},{"id":"maintenance","label":"Recent maintenance","score":100,"weight":0.14,"status":"pass","detail":"1d since push"},{"id":"license","label":"License clarity","score":42,"weight":0.09,"status":"warn","detail":"Unknown"},{"id":"documentation","label":"README/SKILL.md completeness","score":86,"weight":0.14,"status":"pass","detail":"Metadata includes enough usage and workflow context"},{"id":"dependency_risk","label":"Dependency/runtime risk","score":82,"weight":0.12,"status":"pass","detail":"network or browser surface"},{"id":"installability","label":"Install availability","score":92,"weight":0.1,"status":"pass","detail":"npx skills add margelo/react-native-skills --skill kotlin"},{"id":"install_safety","label":"Install command safety","score":92,"weight":0.1,"status":"pass","detail":"standard package or runtime install path"},{"id":"permission_surface","label":"Permission surface","score":72,"weight":0.07,"status":"info","detail":"filesystem or document access, network or browser access"},{"id":"repository","label":"Repository evidence","score":86,"weight":0.04,"status":"pass","detail":"https://github.com/margelo/react-native-skills/tree/main/skills/kotlin"},{"id":"review_status","label":"Review status","score":66,"weight":0.05,"status":"info","detail":"AI review data available"},{"id":"agent_outcomes","label":"Agent Proven outcomes","score":54,"weight":0.13,"status":"info","detail":"No agent outcome data yet"}],"checks":[{"status":"info","label":"GitHub adoption","detail":"161 GitHub stars"},{"status":"warn","label":"Stars/forks activity","detail":"161 stars, 7 forks; issue activity unavailable in current metadata"},{"status":"pass","label":"Recent maintenance","detail":"1d since push"},{"status":"warn","label":"License clarity","detail":"Unknown"},{"status":"pass","label":"README/SKILL.md completeness","detail":"Metadata includes enough usage and workflow context"},{"status":"pass","label":"Dependency/runtime risk","detail":"network or browser surface"},{"status":"pass","label":"Install availability","detail":"npx skills add margelo/react-native-skills --skill kotlin"},{"status":"pass","label":"Install command safety","detail":"standard package or runtime install path"},{"status":"info","label":"Permission surface","detail":"filesystem or document access, network or browser access"},{"status":"pass","label":"Repository evidence","detail":"https://github.com/margelo/react-native-skills/tree/main/skills/kotlin"},{"status":"info","label":"Review status","detail":"AI review data available"},{"status":"info","label":"Agent Proven outcomes","detail":"No agent outcome data yet"},{"status":"warn","label":"Ownership","detail":"No approved owner claim yet"},{"status":"pass","label":"OpenAgentSkill usage","detail":"6 views, 0 install copies"},{"status":"info","label":"Agent outcomes","detail":"No agent outcome data yet"}],"strengths":["AI review approved","Install path is available","Repository evidence is available","Recently maintained repository","Install command has no obvious high-risk pattern","Outcome loop is ready but needs first real agent run"],"warnings":["The repository license is unknown, which may raise concerns about usage rights and redistribution.","Financial research output is not financial advice; require human review before any live investment decision.","License is unclear","Quality score needs review","Stars/forks activity: 161 stars, 7 forks; issue activity unavailable in current metadata","License clarity: Unknown","No real agent outcome reports yet","Human review required before unattended installation"],"evidence":{"stars":"161 GitHub stars","repoActivity":"161 stars, 7 forks","lastPushed":"1d since push","license":"Unknown","repository":"https://github.com/margelo/react-native-skills/tree/main/skills/kotlin","install":"npx skills add margelo/react-native-skills --skill kotlin","installSafety":"standard package or runtime install path","permissionSurface":"filesystem or document access, network or browser access","documentation":"Strong README/SKILL.md context","agentOutcomes":"No agent outcome data yet","agentProvenScore":0,"outcomeConfidence":"0%","installPolicy":"human_review_before_install"},"installReadiness":{"ready":true,"command":"npx skills add margelo/react-native-skills --skill kotlin","policy":"human_review_before_install","label":"Human review before install","notes":["Install path is available","Repository evidence is available","License is unclear","No Agent Proven outcome evidence yet","1d since push","Financial domain: human review is required before use in a live investment workflow.","Trust Score v5 requires review or sandbox-only use before install."]},"agentCompatibility":["Codex","Claude Code","Cursor","OpenAgentSkill CLI"],"riskSummary":{"level":"medium","label":"Review before production","notes":["The repository license is unknown, which may raise concerns about usage rights and redistribution.","Financial research output is not financial advice; require human review before any live investment decision.","License is unclear","Quality score needs review","Stars/forks activity: 161 stars, 7 forks; issue activity unavailable in current metadata"]},"outcomeEvidence":{"total":0,"successes":0,"failures":0,"notRelevant":0,"successRate":null,"installAttempts":0,"riskBlocked":0,"setupRequired":0,"installSuccessRate":null,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"recentSuccessRate":null,"recentFailureRate":null,"uniqueAgents":0,"agentProvenScore":0,"agentProvenLabel":"Needs first agent run","lastOutcomeAt":null,"label":"No agent outcome data yet"},"autoInstall":{"allowed":false,"sandboxRequired":true,"policy":"human_review_before_install","reason":"Compare alternatives before installing."},"outcome_loop":{"version":"openagentskill-agent-outcome-v3","required_after_install":true,"endpoint":"/api/agent/outcome","method":"POST","event_id_source":"feedback.event_id, install_receipt.resolve_event_id, or decision_packet.outcome_feedback.event_id","expected_outcomes":["success","failed","not_relevant","blocked_by_risk","setup_required"],"required_fields":["event_id","skill_slug","task"],"quality_fields":["task_success","output_quality","error_type","human_review_required","used_in_production","workspace","evidence_url","time_to_useful_ms"],"ranking_inputs_updated":["Trust Score v5 outcome confidence","Agent Proven Score","Resolve ranking task-fit evidence","Skill detail machine-readable metadata","Outcome leaderboard"]},"agent_contract":{"suited_tasks":["design-creative","agent-skill"],"suited_agents":["Codex","Claude Code","Cursor","OpenAgentSkill CLI"],"install_command":"npx skills add margelo/react-native-skills --skill kotlin","trust_score":61,"trust_version":"trust-score-v5","risk_level":"medium","do_not_use_when":["Production credentials, payments, or irreversible account changes without explicit human review","Sensitive private data before reviewing repository code, license, and permission surface","Automatic installation in a production workspace","Commercial reuse before clarifying license terms","Autonomous investment, trading, tax, or suitability decisions without a qualified human review"],"before_install":["Read the audit page and machine-readable metadata.","Confirm the install command, license, and permission surface fit the workspace.","Get explicit human approval or choose an alternative before installing."],"after_run":["Report the outcome to /api/agent/outcome using the resolve event id.","Include output_quality, workspace, human_review_required, and evidence_url when available.","Re-resolve before broad production rollout."]},"bestFor":["design-creative","agent-skill"],"doNotUseFor":["Production credentials, payments, or irreversible account changes without explicit human review","Sensitive private data before reviewing repository code, license, and permission surface","Automatic installation in a production workspace","Commercial reuse before clarifying license terms","Autonomous investment, trading, tax, or suitability decisions without a qualified human review"],"knownRisks":["The repository license is unknown, which may raise concerns about usage rights and redistribution.","Financial research output is not financial advice; require human review before any live investment decision.","License is unclear","Quality score needs review","Stars/forks activity: 161 stars, 7 forks; issue activity unavailable in current metadata","License clarity: Unknown"],"backward_compatible":{"trust_score_v4":{"version":"trust-score-v4","score":69,"tier":"review","label":"Manual review","summary":"Potentially useful, but at least one trust signal needs human inspection."}}},"trust_score_v5":{"version":"trust-score-v5","score":61,"base_score":69,"outcome_confidence":0,"tier":"review","label":"Sandbox only","summary":"Useful candidate with missing or mixed trust signals. Keep it in an isolated workspace until the outcome loop proves task fit.","recommendedAction":"Run only in a sandbox and compare close alternatives before using it for real work.","decision":{"install_policy":"human_review_before_install","auto_install_allowed":false,"human_review_required":true,"sandbox_first":true,"agent_action":"Compare alternatives before installing.","reasoning":["61/100 Trust Score v5","69/100 Trust Score v4 baseline","Needs more real agent outcomes before unattended install","Install path is available","Review before production"],"review_required_when":["The workspace contains production secrets, payments, private customer data, or irreversible actions.","The install command requests shell, network, credential, database, or broad filesystem access.","Outcome evidence is missing, recently failed, or required human review.","Production credentials, payments, or irreversible account changes without explicit human review","Sensitive private data before reviewing repository code, license, and permission surface","Automatic installation in a production workspace"]},"dimensions":[{"id":"github_adoption","label":"GitHub adoption","score":62,"weight":0.13,"status":"info","detail":"161 GitHub stars"},{"id":"repo_activity","label":"Stars/forks activity","score":51,"weight":0.08,"status":"warn","detail":"161 stars, 7 forks; issue activity unavailable in current metadata"},{"id":"maintenance","label":"Recent maintenance","score":100,"weight":0.14,"status":"pass","detail":"1d since push"},{"id":"license","label":"License clarity","score":42,"weight":0.09,"status":"warn","detail":"Unknown"},{"id":"documentation","label":"README/SKILL.md completeness","score":86,"weight":0.14,"status":"pass","detail":"Metadata includes enough usage and workflow context"},{"id":"dependency_risk","label":"Dependency/runtime risk","score":82,"weight":0.12,"status":"pass","detail":"network or browser surface"},{"id":"installability","label":"Install availability","score":92,"weight":0.1,"status":"pass","detail":"npx skills add margelo/react-native-skills --skill kotlin"},{"id":"install_safety","label":"Install command safety","score":92,"weight":0.1,"status":"pass","detail":"standard package or runtime install path"},{"id":"permission_surface","label":"Permission surface","score":72,"weight":0.07,"status":"info","detail":"filesystem or document access, network or browser access"},{"id":"repository","label":"Repository evidence","score":86,"weight":0.04,"status":"pass","detail":"https://github.com/margelo/react-native-skills/tree/main/skills/kotlin"},{"id":"review_status","label":"Review status","score":66,"weight":0.05,"status":"info","detail":"AI review data available"},{"id":"agent_outcomes","label":"Agent Proven outcomes","score":54,"weight":0.13,"status":"info","detail":"No agent outcome data yet"}],"checks":[{"status":"info","label":"GitHub adoption","detail":"161 GitHub stars"},{"status":"warn","label":"Stars/forks activity","detail":"161 stars, 7 forks; 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Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: Design, implement, and review Kotlin and Android APIs. Use when working on .kt files, Kotlin nullability, sealed classes/interfaces, coroutines, Android threading, Java interop, or Kotlin-backed React Native Nitro Module implementations. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"margelo-kotlin\",\"task\":\"Install kotlin\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."},{"id":"claude-code","label":"Claude Code","kind":"agent-prompt","value":"Add \"kotlin\" as a Claude Code skill from https://github.com/margelo/react-native-skills/tree/main/skills/kotlin. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: Design, implement, and review Kotlin and Android APIs. Use when working on .kt files, Kotlin nullability, sealed classes/interfaces, coroutines, Android threading, Java interop, or Kotlin-backed React Native Nitro Module implementations. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"margelo-kotlin\",\"task\":\"Install kotlin\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."},{"id":"cursor","label":"Cursor","kind":"agent-prompt","value":"Turn \"kotlin\" from https://github.com/margelo/react-native-skills/tree/main/skills/kotlin into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: Design, implement, and review Kotlin and Android APIs. Use when working on .kt files, Kotlin nullability, sealed classes/interfaces, coroutines, Android threading, Java interop, or Kotlin-backed React Native Nitro Module implementations. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"margelo-kotlin\",\"task\":\"Install kotlin\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes."}],"handoff_url":"https://www.openagentskill.com/api/skills/margelo-kotlin/install","manifest_url":"https://www.openagentskill.com/api/registry/manifest/margelo-kotlin"},"trust":{"score":69,"label":"Manual review","version":"trust-score-v4","install_policy":"human_review_before_install","evidence":{"stars":"161 GitHub stars","repoActivity":"161 stars, 7 forks","lastPushed":"1d since push","license":"Unknown","repository":"https://github.com/margelo/react-native-skills/tree/main/skills/kotlin","install":"npx skills add margelo/react-native-skills --skill kotlin","installSafety":"standard package or runtime install path","permissionSurface":"filesystem or document access, network or browser access","documentation":"Strong README/SKILL.md context","agentOutcomes":"No agent outcome data yet"},"outcome_evidence":{"total":0,"successes":0,"failures":0,"not_relevant":0,"success_rate":null,"recent_success_rate":null,"recent_failure_rate":null,"install_attempts":0,"install_success_rate":null,"risk_blocked":0,"setup_required":0,"avg_output_quality":null,"production_outcomes":0,"last_outcome_at":null,"label":"No agent outcome data yet"},"auto_install":{"allowed":false,"sandbox_required":true,"reason":"Human review or sandbox validation is required before automatic installation."},"best_for":["design-creative","agent-skill"],"known_risks":["The repository license is unknown, which may raise concerns about usage rights and redistribution.","Financial research output is not financial advice; require human review before any live investment decision.","License is unclear","Quality score needs review","Stars/forks activity: 161 stars, 7 forks; issue activity unavailable in current metadata","License clarity: Unknown"]},"agent_proven":{"version":"agent-proven-v1","score":0,"tier":"unproven","label":"Needs first agent run","summary":"No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.","metrics":{"totalOutcomes":0,"successfulOutcomes":0,"failedOutcomes":0,"installAttempts":0,"installSuccessRate":null,"successRate":null,"recentSuccessRate":null,"recentFailureRate":null,"riskBlocked":0,"setupRequired":0,"notRelevant":0,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"uniqueAgents":0,"lastOutcomeAt":null},"signals":[],"penalties":["No real agent outcome evidence yet"]},"audit":{"score":75,"risk_level":"needs_review","risk_label":"Needs review","warnings":["License is unclear","Financial research output is not financial advice; require human review before any live investment decision","The repository license is unknown, which may raise concerns about usage rights and redistribution.","The SKILL.md excerpt appears truncated at the 'Properties' section, but the provided content is otherwise coherent.","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Stars/forks activity: 161 stars, 7 forks; issue activity unavailable in current metadata","License clarity: Unknown"]},"safety_gate":{"tier":"reviewed","label":"Reviewed with permission notes","auto_install_policy":"review","auto_install_allowed":false,"human_review_required":true,"blocked":false,"recommended_action":"Require human approval before installing into a real workspace."},"quality":{"score":64,"label":"Promising"},"supply":{"track":"Coding and developer agents","scenario":"GitHub automation","maintenance":"1d since push","risk":"Needs review"},"alternative_skills":[],"do_not_use_when":["teams that need a vendor-supported SLA","production agents without a repository review","The repository license is unknown, which may raise concerns about usage rights and redistribution.","License is unclear","Financial research output is not financial advice; require human review before any live investment decision","The SKILL.md excerpt appears truncated at the 'Properties' section, but the provided content is otherwise coherent.","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review"],"agent_contract":{"task_input":"Use kotlin in an agent workflow","recommended_action":"Require human approval before installing into a real workspace.","install_policy":"review","minimum_review_before_use":["Trust: 69/100 Manual review","Audit: 75/100 Needs review","Safety: 59/100 Review before install","Review repository, license, install command, and permission surface before production use."],"expected_agent_output":{"selected_skill":"margelo-kotlin (kotlin)","install_command":"npx skills add margelo/react-native-skills --skill kotlin","risk_summary":"Needs review; Reviewed with permission notes; Review before production","verification_result":"Report the smallest successful task, files touched, warnings, and any missing setup."}},"outcome_feedback":{"endpoint":"https://www.openagentskill.com/api/agent/outcome","method":"POST","requires_resolve_event_id":true,"event_id_source":"Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.","expected_outcomes":["success","failed","not_relevant","blocked_by_risk","setup_required"],"payload_template":{"event_id":"<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>","skill_slug":"margelo-kotlin","task":"Use kotlin in an agent workflow","agent":"codex","outcome":"success","install_used":true,"risk_blocked":false,"setup_required":false,"task_success":true,"output_quality":4,"error_type":null,"human_review_required":false,"workspace":"sandbox","time_to_useful_ms":120000,"notes":"Report the smallest successful task, setup friction, files touched, and risk notes."}},"endpoints":{"web":"https://www.openagentskill.com/skills/margelo-kotlin","api":"https://www.openagentskill.com/api/agent/skills/margelo-kotlin","audit":"https://www.openagentskill.com/skills/margelo-kotlin/audit","eval":"https://www.openagentskill.com/api/agent/evals?slug=margelo-kotlin&task=Use%20kotlin%20in%20an%20agent%20workflow&max_risk=medium","resolve":"https://www.openagentskill.com/api/agent/resolve?task=Use%20kotlin%20in%20an%20agent%20workflow&agent=codex&max_risk=medium","receipt":"https://www.openagentskill.com/api/agent/receipt?task=Use%20kotlin%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text","install":"https://www.openagentskill.com/api/skills/margelo-kotlin/install","manifest":"https://www.openagentskill.com/api/registry/manifest/margelo-kotlin"}},"supply_profile":{"track":{"slug":"coding","label":"Coding and developer agents","shortLabel":"Coding","description":"Code review, repo analysis, testing, CI, GitHub, DevOps, and developer workflow skills."},"scenario":{"label":"GitHub automation","description":"I need my agent to triage GitHub issues, review pull requests, and summarize repository changes.","useCases":[{"slug":"workflow-automation","title":"Workflow automation"},{"slug":"github-automation","title":"GitHub automation"},{"slug":"local-desktop","title":"Local desktop"}]},"applicableAgents":["Claude Code","CLI","Codex","Cursor"],"install":{"ready":true,"command":"npx skills add margelo/react-native-skills --skill kotlin","primaryTarget":"CLI","targetCount":4},"githubQuality":{"stars":161,"starsLabel":"161","forks":7,"license":"Unknown","qualityScore":64,"trustScore":69,"auditScore":75},"maintenance":{"status":"fresh","label":"1d since push","daysSincePush":1,"lastPushedAt":"2026-08-21T15:16:33+00:00"},"risk":{"level":"needs_review","label":"Needs review","requiresReview":true,"notes":["License is unclear","Financial research output is not financial advice; require human review before any live investment decision","The repository license is unknown, which may raise concerns about usage rights and redistribution.","The SKILL.md excerpt appears truncated at the 'Properties' section, but the provided content is otherwise coherent.","Financial research output is not financial advice; require human review before any live investment decision."]},"coverageTags":["Coding","GitHub automation","design-creative","agent-skill"]},"audit":{"audit_score":75,"risk_level":"needs_review","risk_label":"Needs review","quality_score":64,"trust_score":69,"maintenance_score":100,"security_score":73,"install_score":92,"warnings":["License is unclear","Financial research output is not financial advice; require human review before any live investment decision","The repository license is unknown, which may raise concerns about usage rights and redistribution.","The SKILL.md excerpt appears truncated at the 'Properties' section, but the provided content is otherwise coherent.","Financial research output is not financial advice; require human review before any live investment decision.","Quality score needs review","Stars/forks activity: 161 stars, 7 forks; issue activity unavailable in current metadata","License clarity: Unknown"]},"quality_signals":{"model":"v2","star_score":15.47,"usage_score":0,"review_score":5.25,"metadata_score":3,"freshness_score":15},"platforms":["Claude Code"],"use_cases":[{"slug":"workflow-automation","title":"Workflow automation","url":"https://www.openagentskill.com/use-cases/workflow-automation"},{"slug":"github-automation","title":"GitHub automation","url":"https://www.openagentskill.com/use-cases/github-automation"},{"slug":"local-desktop","title":"Local desktop","url":"https://www.openagentskill.com/use-cases/local-desktop"},{"slug":"coding-agents","title":"Coding agents","url":"https://www.openagentskill.com/use-cases/coding-agents"}],"stacks":[{"slug":"content-growth-agent","title":"Content growth agent","url":"https://www.openagentskill.com/collections/content-growth-agent"},{"slug":"frontend-product-ui","title":"Frontend and UI","url":"https://www.openagentskill.com/collections/frontend-product-ui"},{"slug":"coding-review-agent","title":"Coding review agent","url":"https://www.openagentskill.com/collections/coding-review-agent"}],"install":"npx skills add margelo/react-native-skills --skill kotlin","install_targets":[{"id":"openagentskill-cli","label":"CLI","title":"OpenAgentSkill CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.2.1/openagentskill-0.2.1.tgz install margelo-kotlin","description":"Resolve policy, run the source installer safely, and report a verified install receipt.","copyLabel":"Copy command"},{"id":"codex","label":"Codex","title":"Codex install prompt","kind":"agent-prompt","value":"Install the \"kotlin\" agent skill from https://github.com/margelo/react-native-skills/tree/main/skills/kotlin. Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: Design, implement, and review Kotlin and Android APIs. Use when working on .kt files, Kotlin nullability, sealed classes/interfaces, coroutines, Android threading, Java interop, or Kotlin-backed React Native Nitro Module implementations. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"margelo-kotlin\",\"task\":\"Install kotlin\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Give Codex a repo-aware install prompt when the skill is not available through a local CLI.","copyLabel":"Copy prompt"},{"id":"claude-code","label":"Claude Code","title":"Claude Code skill prompt","kind":"agent-prompt","value":"Add \"kotlin\" as a Claude Code skill from https://github.com/margelo/react-native-skills/tree/main/skills/kotlin. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: Design, implement, and review Kotlin and Android APIs. Use when working on .kt files, Kotlin nullability, sealed classes/interfaces, coroutines, Android threading, Java interop, or Kotlin-backed React Native Nitro Module implementations. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"margelo-kotlin\",\"task\":\"Install kotlin\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this prompt to ask Claude Code to add the skill and explain the local activation steps.","copyLabel":"Copy prompt"},{"id":"cursor","label":"Cursor","title":"Cursor rule prompt","kind":"agent-prompt","value":"Turn \"kotlin\" from https://github.com/margelo/react-native-skills/tree/main/skills/kotlin into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: Design, implement, and review Kotlin and Android APIs. Use when working on .kt files, Kotlin nullability, sealed classes/interfaces, coroutines, Android threading, Java interop, or Kotlin-backed React Native Nitro Module implementations. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"margelo-kotlin\",\"task\":\"Install kotlin\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this when installing as Cursor project rules or reusable agent instructions.","copyLabel":"Copy prompt"}],"repository":"https://github.com/margelo/react-native-skills/tree/main/skills/kotlin","github_repo":"margelo/react-native-skills","version":"1.0.0","license":"Unknown","urls":{"web":"https://www.openagentskill.com/skills/margelo-kotlin","repository":"https://github.com/margelo/react-native-skills/tree/main/skills/kotlin","api":"/api/agent/skills/margelo-kotlin","install_api":"/api/skills/margelo-kotlin/install"},"meta":{"created_at":"2026-08-21T15:35:53.164483+00:00","updated_at":"2026-08-21T15:35:53.164483+00:00","agent_friendly":true}}