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 pledgeandgrow/pledge-skills --skill kotlingit clone --depth 1 https://github.com/pledgeandgrow/pledge-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/pledgeandgrow/pledge-skills/kotlin)<a href="https://agentmods.dev/skills/pledgeandgrow/pledge-skills/kotlin"><img src="https://agentmods.dev/badge/skills/pledgeandgrow/pledge-skills/kotlin/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/pledgeandgrow/pledge-skills/kotlin"><img src="https://agentmods.dev/badge/skills/pledgeandgrow/pledge-skills/kotlin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00183 | $0.02315 |
| Opus 5 | $0.00092 | $0.01157 |
| Sonnet 5 | $0.00037 | $0.00463 |
| Haiku 4.5 | $0.00018 | $0.00231 |
Grade A, and why
kotlin-docs 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 — 287 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Kotlin Expert (v2.4.0)
Official Documentation: https://kotlinlang.org/docs/home.html
Quick Reference
| Topic | File |
|---|---|
| Variables, basic types, strings, control flow, ranges, when | basics-syntax.md |
| Functions, named args, defaults, lambdas, function types, inline | functions-lambdas.md |
| Classes, constructors, properties, inheritance, interfaces, data/sealed/enum classes, objects | classes-objects.md |
| List, Set, Map, sequences, collection operations, functional API | collections.md |
| Nullable types, safe calls, Elvis, smart casts, not-null assertion | null-safety.md |
| Suspending functions, launch, async, Flow, StateFlow, channels, dispatchers | coroutines.md |
| Variance, reified type parameters, star projections, type bounds | generics.md |
| DSLs, type-safe builders, scope functions, extension functions, delegation | dsl-builders.md |
| Kotlin Multiplatform (KMP), expect/actual, platform-specific code, sharing logic | multiplatform.md |
| @Serializable, JSON, ProtoBuf, polymorphism, custom serializers | serialization.md |
| Java interop, migration guides, Kotlin/Java differences, JSpecify | java-interop.md |
| JUnit 5, assertions, parameterized tests, coroutine testing, mocking | testing.md |
| Gradle, Kotlin Gradle Plugin, Maven, compiler options, KSP | build-tools.md |
| Idiomatic Kotlin patterns, coding conventions, best practices | idioms-best-practices.md |
| Kotlin 2.4.0 features, language changes, stdlib additions, migration | whats-new.md |
| Reflection, KClass, callable references, property/constructor references | reflection.md |
| Exceptions, try-catch-finally, precondition functions, Nothing type, custom exceptions | exceptions.md |
| Annotations, use-site targets, @Target, @Retention, @Repeatable, Java annotations | annotations.md |
| Type checks (is/!is), smart casts, as/as?, structural vs referential equality, floating-point | type-casts-equality.md |
Core Philosophy
What ships with it
19 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.
- annotations.md 7.5 KB
- basics-syntax.md 16 KB
- build-tools.md 12 KB
- classes-objects.md 21 KB
- collections.md 13 KB
- coroutines.md 16 KB
- dsl-builders.md 16 KB
- exceptions.md 7.2 KB
- functions-lambdas.md 16 KB
- generics.md 7.4 KB
- idioms-best-practices.md 11 KB
- java-interop.md 9.7 KB
- multiplatform.md 13 KB
- null-safety.md 5.8 KB
- reflection.md 6.5 KB
- serialization.md 8.8 KB
- testing.md 9.3 KB
- type-casts-equality.md 7.1 KB
- whats-new.md 7.2 KB
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 · 287 lines · 183 tokens per session scan A becbc0c1ff11
kotlin-docs is a skill published in the GitHub repository pledgeandgrow/pledge-skills (10 stars, last pushed 1mo ago), licensed MIT. It adds 183 tokens to every session and 2,315 once invoked, about $0.0009 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 2026-08-31.
Other skills, from other repositories
kotlin-expert
Expert-level Kotlin development, Android, coroutines, and multiplatform. Use when the user mentions Android, coroutines, multiplatform, or JVM, or when the task involves Kotlin Fundamentals, Android Development, Kotlin Multiplatform, or Kotlin Style.
compose-animations
Use when writing or reviewing Jetpack Compose motion: visibility enter/exit, animating one property toward a target, color or size transitions, multiple properties from one state, switching composable content, or choosing between AnimatedVisibility, animateAsState, rememberTransition, AnimatedContent, and Crossfade.
compose-focus-navigation
Use when writing or reviewing Jetpack Compose UI for TV, keyboard, desktop, accessibility focus, D-pad navigation, FocusRequester, focusProperties, key events, or initial focus behavior.
kotlin-control-flow
Use when writing or reviewing Kotlin branching and control flow: when expressions, guard conditions, sealed type exhaustiveness, smart casts, nullable branching, early returns, or replacing complex if/else chains.
release-kotlin-library
Use when preparing, publishing, or checking readiness for a new Kotlin library version in a repository using gradle-maven-publish-plugin, including release changelog reconciliation, API snapshots, and publication verification.
using-chrisbanes-skills
Use when routing Kotlin or Jetpack Compose work, or physical Android benchmark evidence that needs a configuration decision, especially when several Kotlin or Compose concerns overlap.