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kotlin-api-consultant

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Aktualisiert19. März 2026 um 01:49

Queries Kotlin compiler source code for API validation, compatibility checks, and breaking change detection. Use when validating Kotlin compiler APIs, checking IrGenerationExtension compatibility, analyzing compiler plugin API usage, or verifying that an API hasn't been deprecated or removed in a newer Kotlin version. Make sure to use this skill whenever compiler plugin code references Kotlin internal APIs — these APIs change frequently between Kotlin versions and silent breakage is common.

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rsicarelli

rsicarelli/fakt

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SoftwareentwicklerInformatik- und Mathematikberufe·SOC 15-1252

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SKILL.md

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name	kotlin-api-consultant
description	Queries Kotlin compiler source code for API validation, compatibility checks, and breaking change detection. Use when validating Kotlin compiler APIs, checking IrGenerationExtension compatibility, analyzing compiler plugin API usage, or verifying that an API hasn't been deprecated or removed in a newer Kotlin version. Make sure to use this skill whenever compiler plugin code references Kotlin internal APIs — these APIs change frequently between Kotlin versions and silent breakage is common.
allowed-tools	Read, Grep, Glob, Bash, WebFetch

Kotlin API Consultant

Validates Kotlin compiler API usage, detects breaking changes, and provides best practice recommendations for compiler plugin development.

Core Mission

Provides Kotlin compiler API validation by consulting source code, detecting breaking changes, and ensuring API compatibility across Kotlin versions.

Instructions

1. Identify Target API

Extract from conversation:

API class/interface name from user's message
Look for patterns: "check IrGenerationExtension", "validate IrPluginContext API"
Common APIs: IrGenerationExtension, IrPluginContext, IrFactory, IrClass, IrTypeParameter, CompilerPluginRegistrar

If unclear or missing:

Ask: "Which Kotlin compiler API would you like me to consult?"
Suggest: IrGenerationExtension | IrPluginContext | IrFactory | CompilerPluginRegistrar | Other

2. Locate API in Kotlin Compiler Source

Search Kotlin source on GitHub or local copy if available:

Common package locations:

org.jetbrains.kotlin.backend.common.extensions (IR extension APIs)
org.jetbrains.kotlin.ir.declarations (IR tree elements)
org.jetbrains.kotlin.ir.expressions (IR expressions)
org.jetbrains.kotlin.ir.types (Type system)
org.jetbrains.kotlin.fir (FIR APIs)
org.jetbrains.kotlin.compiler.plugin (Plugin registration)

If not found:

API '${API_NAME}' not found

Suggestions:
1. Check spelling (case-sensitive)
2. Check if it's an internal/experimental API
3. Consult: https://kotlinlang.org/docs/compiler-plugins.html

3. Analyze API Definition

Extract key information:

Package and imports
Interface/class declaration
Generic type parameters
Method signatures
Annotations (@UnsafeApi, @FirIncompatiblePluginAPI, @Deprecated)
Default implementations

Critical annotation markers:

@UnsafeApi                          // May change without notice
@FirIncompatiblePluginAPI          // K1 only, not K2
@Deprecated(message = "...", level = ERROR)  // Removal planned
@ExperimentalCompilerApi           // Unstable, may change

4. Detect Breaking Changes

Breaking change indicators:

Removed methods
Changed method signatures
Added abstract methods to interface
Changed return types
New required type parameters
Deprecation with ReplaceWith (migration path)

5. Generate API Report

KOTLIN API CONSULTATION: ${API_NAME}

LOCATION:
Package: org.jetbrains.kotlin...
Module: ...

DEFINITION (Kotlin ${VERSION}):
[Interface/class definition]

STABILITY: Stable / Experimental / Deprecated
K2 COMPATIBLE: Yes / No / Partial

FAKT USAGE:
- [How Fakt uses this API]
- [Alignment status]

WARNINGS:
- [Any @UnsafeApi warnings]
- [Deprecation notices]

RECOMMENDATIONS:
1. [Recommendation]
...

6. Provide Usage Recommendations

If API is stable: Safe to use directly. If API has @UnsafeApi: Consider abstraction layer for isolation. If API is deprecated: Show migration path with replacement API.

Supporting Files

resources/api-lookup-patterns.md - Strategies for finding APIs
resources/breaking-changes-catalog.md - Known breaking changes across Kotlin versions
resources/api-best-practices.md - Best practices for compiler plugin APIs

Related Skills

compiler-architecture-validator - Validate architectural patterns
compilation — Debug compilation errors
docs-navigator — Access documentation

API Categories

Category	Examples	Stability
Core IR	IrGenerationExtension, IrPluginContext	Stable
FIR Phase	FirExtensionRegistrar	K2 specific
Plugin System	CompilerPluginRegistrar	Stable
Type System	IrTypeParameter, IrType	Moderate
Experimental	Various @ExperimentalCompilerApi	Unstable

Validation Checklist

Before using an API in Fakt:

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