{"passport":{"unfragile":{"@version":"1.0","version":"2026-05","artifact":{"id":"github-square--kotlinpoet","slug":"square--kotlinpoet","name":"kotlinpoet","type":"repo","url":"https://square.github.io/kotlinpoet/","page_url":"https://unfragile.ai/square--kotlinpoet","categories":["frameworks-sdks"],"tags":["code-generation","javapoet","kotlin"],"pricing":{"model":"open_source","free":true,"starting_price":null},"status":"active","verified":false},"capabilities":[{"id":"github-square--kotlinpoet__cap_0","uri":"capability://code.generation.editing.type.safe.kotlin.source.file.generation.via.hierarchical.builder.pattern","name":"type-safe kotlin source file generation via hierarchical builder pattern","description":"Generates complete .kt source files programmatically using a composition-based builder pattern where FileSpec acts as the root container, with nested builders for TypeSpec (classes/interfaces/objects), FunSpec (functions), PropertySpec (properties), and ParameterSpec (parameters). The API mirrors Kotlin's syntactic structure directly, allowing developers to construct code hierarchically without string concatenation or template engines. Each Spec class has a corresponding Builder that enforces type safety at compile time.","intents":["Generate boilerplate Kotlin classes and data classes programmatically","Create type-safe code generators for annotation processors","Build code generation pipelines that output valid Kotlin syntax","Eliminate manual string-based code generation with compile-time safety"],"best_for":["Kotlin/Java developers building annotation processors","Framework authors generating boilerplate code","Teams building code generation tools and DSLs","Developers migrating from JavaPoet to Kotlin"],"limitations":["Builder pattern requires explicit construction of each code element — no shorthand for complex nested structures","No built-in support for formatting preferences beyond basic indentation control","Limited to Kotlin syntax generation only — cannot generate Java files directly (though JavaPoet interop exists)"],"requires":["Kotlin 1.4+ or Java 8+","KotlinPoet library on classpath (Maven Central: com.squareup:kotlinpoet:2.2.0+)","Basic understanding of Kotlin type system and syntax"],"input_types":["Kotlin type references (ClassName, ParameterizedTypeName, LambdaTypeName)","Code blocks as strings with format placeholders","Metadata from reflection or annotation processing"],"output_types":[".kt source files written to filesystem","String representations of Kotlin code","Appendable streams for in-memory code generation"],"categories":["code-generation-editing","code-generation-framework"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-square--kotlinpoet__cap_1","uri":"capability://code.generation.editing.polymorphic.type.representation.with.generics.lambdas.and.variance.support","name":"polymorphic type representation with generics, lambdas, and variance support","description":"Represents all Kotlin type references through a TypeName class hierarchy (ClassName, ParameterizedTypeName, WildcardTypeName, TypeVariableName, LambdaTypeName) that captures generics, type parameters, variance modifiers (in/out), and lambda signatures. The type system allows composing complex types like Map<String, (Int) -> Boolean> by nesting TypeName instances, with built-in support for nullable types, platform types, and Kotlin-specific constructs. Type names are immutable and can be reused across multiple code generation contexts.","intents":["Generate function signatures with generic type parameters and bounds","Create properties with complex parameterized types","Represent lambda types with specific input/output signatures","Handle variance annotations (in/out) for generic type parameters"],"best_for":["Developers generating type-safe APIs with complex generic hierarchies","Framework authors creating DSLs with lambda-based configurations","Annotation processors that need to preserve generic type information"],"limitations":["Type names are representation-only — no runtime type checking or validation against actual classpath types","Variance modifiers (in/out) are syntactic only — no enforcement of Liskov substitution principle at generation time","No built-in support for intersection types or union types (Kotlin doesn't have these natively)"],"requires":["Understanding of Kotlin generics and type variance","KotlinPoet library with TypeName classes available","Optional: Kotlin reflection or KSP for extracting type information from existing code"],"input_types":["Class references (Class<T> or KClass<T>)","Type strings (e.g., 'java.util.List')","Nested TypeName instances for composition"],"output_types":["TypeName instances representing Kotlin types","Generated Kotlin type syntax in .kt files"],"categories":["code-generation-editing","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-square--kotlinpoet__cap_10","uri":"capability://code.generation.editing.import.statement.management.and.package.aware.code.generation","name":"import statement management and package-aware code generation","description":"Automatically manages import statements and package declarations in generated .kt files, resolving type references to their fully qualified names and generating appropriate imports. The system tracks which types are used in the generated code and generates import statements only for types that are actually referenced, avoiding unused imports. It also handles package-local types and star imports intelligently.","intents":["Generate .kt files with correct import statements","Avoid unused imports in generated code","Manage package declarations and namespacing","Handle type references across different packages"],"best_for":["Code generators that need to produce clean, importable .kt files","Framework authors generating libraries with proper package structure","Teams building code generation tools that must follow Kotlin conventions"],"limitations":["Import management is automatic but not customizable — no support for import aliases or custom import ordering","Star imports (import java.util.*) are not generated automatically — all types must be explicitly imported","No built-in support for suppressing imports or managing conflicting type names from different packages"],"requires":["KotlinPoet library with FileSpec support","Package name specification for generated files"],"input_types":["Type references (ClassName, ParameterizedTypeName, etc.)","Package name for the generated file"],"output_types":["Generated .kt files with package declaration and import statements","Properly formatted Kotlin code with resolved type references"],"categories":["code-generation-editing","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-square--kotlinpoet__cap_11","uri":"capability://code.generation.editing.modifier.and.annotation.application.to.generated.declarations","name":"modifier and annotation application to generated declarations","description":"Applies Kotlin modifiers (public, private, internal, protected, abstract, final, open, sealed, data, inline, etc.) and annotations to generated types, functions, properties, and parameters. The API provides type-safe methods for adding modifiers and annotations, with validation to prevent invalid modifier combinations (e.g., abstract and final). Annotations can include parameters and are properly formatted in the generated code.","intents":["Generate classes with specific visibility and mutability modifiers","Apply framework annotations (e.g., @Serializable, @Entity) to generated code","Create abstract base classes and sealed hierarchies","Generate inline functions and value classes"],"best_for":["Code generators that need to produce framework-specific code","Developers generating classes with specific visibility requirements","Framework authors creating annotated code for serialization/ORM"],"limitations":["Modifier validation is basic — some invalid combinations may not be caught at generation time","Annotation parameters must be provided as CodeBlock objects — no type-safe annotation parameter builders","No built-in support for repeatable annotations or annotation inheritance"],"requires":["KotlinPoet library with modifier and annotation support","Understanding of Kotlin modifiers and their semantics"],"input_types":["Modifier enums (KModifier.PUBLIC, KModifier.PRIVATE, etc.)","Annotation specifications with parameters"],"output_types":["Generated .kt files with applied modifiers and annotations","Kotlin code with proper modifier syntax and annotation formatting"],"categories":["code-generation-editing","text-generation-language"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-square--kotlinpoet__cap_12","uri":"capability://code.generation.editing.file.i.o.and.code.output.with.customizable.destination.handling","name":"file i/o and code output with customizable destination handling","description":"Writes generated .kt files to the filesystem or arbitrary Appendable destinations (StringBuilders, Writers, etc.) with support for directory creation and file overwriting. The FileSpec.writeTo() method handles path resolution, file creation, and encoding, while toString() provides in-memory code generation. The system supports writing to standard file paths or custom output directories, making it suitable for both build-time code generation and runtime code inspection.","intents":["Write generated .kt files to the filesystem","Generate code as strings for testing or inspection","Integrate code generation into build pipelines","Support custom output destinations (e.g., in-memory, network)"],"best_for":["Build-time code generators (annotation processors, KSP)","Developers testing code generation logic","Framework authors integrating code generation into build systems"],"limitations":["File I/O is synchronous — no async/non-blocking support for large-scale code generation","No built-in support for incremental code generation or change detection","File overwriting is not atomic — partial writes may occur if the process is interrupted"],"requires":["KotlinPoet library with FileSpec support","Write permissions to the target directory","Java NIO or standard I/O libraries"],"input_types":["FileSpec objects representing complete .kt files","Destination paths or Appendable objects"],"output_types":[".kt files written to filesystem","String representations of generated code"],"categories":["code-generation-editing","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-square--kotlinpoet__cap_2","uri":"capability://code.generation.editing.code.block.formatting.with.placeholder.interpolation.and.smart.indentation","name":"code block formatting with placeholder interpolation and smart indentation","description":"Generates code blocks using a CodeBlock class that accepts format strings with named placeholders (%L for literals, %S for strings, %T for types, %N for names) that are substituted with properly escaped and formatted values. The system automatically handles indentation levels, line breaks, and spacing rules specific to Kotlin syntax. Code blocks can be nested within other code blocks, and the formatter maintains consistent indentation across multi-line constructs like function bodies, class definitions, and control flow statements.","intents":["Generate function bodies with proper indentation and formatting","Interpolate type names and identifiers into code blocks safely","Create control flow statements (if/when/for) with correct nesting","Embed string literals and numeric values without manual escaping"],"best_for":["Developers generating complex function implementations","Framework authors creating code generators with dynamic logic","Teams building code generation tools that need consistent formatting"],"limitations":["Placeholder system requires explicit format specifiers — no automatic type detection for interpolated values","Indentation is automatic but not customizable per code block — uses fixed indent size (typically 2 spaces)","No built-in support for custom formatting rules or code style preferences (e.g., Kotlin style guide variants)"],"requires":["KotlinPoet library with CodeBlock class","Understanding of CodeBlock format specifiers (%L, %S, %T, %N, %M)","Kotlin 1.4+ or Java 8+"],"input_types":["Format strings with placeholders","Values to interpolate (literals, strings, types, names)","Nested CodeBlock instances"],"output_types":["Formatted Kotlin code as strings","Properly indented code blocks in generated .kt files"],"categories":["code-generation-editing","text-generation-language"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-square--kotlinpoet__cap_3","uri":"capability://code.generation.editing.annotation.processing.integration.with.ksp.kotlin.symbol.processing","name":"annotation processing integration with ksp (kotlin symbol processing)","description":"Integrates with Kotlin Symbol Processing (KSP) to read type information, annotations, and metadata from source code during compilation, enabling code generators to inspect existing Kotlin declarations and generate corresponding code. The integration allows KSP processors to use KotlinPoet's builder API to generate new .kt files based on analyzed symbols, with automatic handling of package names, import statements, and type resolution. KSP provides symbol information (KSClassDeclaration, KSFunctionDeclaration, etc.) that can be converted to KotlinPoet TypeName and other Spec objects.","intents":["Generate boilerplate code based on annotations in source files","Create serialization/deserialization code from data class declarations","Generate dependency injection bindings from annotated classes","Build code generators that analyze existing Kotlin code at compile time"],"best_for":["Kotlin developers building annotation processors","Framework authors (e.g., serialization, DI, ORM frameworks)","Teams migrating from KAPT to KSP for faster compilation"],"limitations":["KSP integration requires separate KSP processor implementation — KotlinPoet provides only the code generation side","Symbol information from KSP is read-only — cannot modify existing source code, only generate new files","KSP runs during compilation, so generated code is not available for IDE autocompletion in the same module"],"requires":["Kotlin 1.7+ with KSP plugin configured","KSP processor dependency (com.google.devtools.ksp:symbol-processing-api)","KotlinPoet library with KSP integration support","Gradle or Maven build system with KSP plugin enabled"],"input_types":["KSClassDeclaration, KSFunctionDeclaration, KSPropertyDeclaration from KSP","Annotations on Kotlin source elements","Type information from KSP symbol resolution"],"output_types":["Generated .kt files written to build directory","Code generated during compilation phase"],"categories":["code-generation-editing","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-square--kotlinpoet__cap_4","uri":"capability://code.generation.editing.kotlin.metadata.reflection.for.runtime.type.inspection","name":"kotlin metadata reflection for runtime type inspection","description":"Integrates with Kotlin's reflection API and kotlinx-metadata library to inspect runtime type information from compiled Kotlin classes, including data class properties, extension functions, and generic type parameters. This capability allows code generators to read metadata from already-compiled Kotlin libraries and generate corresponding code (e.g., serializers, builders, copy functions). The integration handles the impedance mismatch between Kotlin's compile-time type system and Java's runtime type information.","intents":["Generate serialization code from data class metadata at runtime","Create builder patterns for immutable data classes","Inspect extension functions and generate corresponding adapters","Generate code based on already-compiled Kotlin libraries"],"best_for":["Runtime code generation frameworks (e.g., serialization libraries)","Developers building dynamic proxy or wrapper generators","Teams needing to generate code from compiled Kotlin dependencies"],"limitations":["Kotlin Metadata is only available on Kotlin classes compiled with metadata enabled — not available for Java classes","Runtime reflection is slower than compile-time KSP processing — not suitable for performance-critical code paths","Generic type information is partially erased at runtime — some type parameters may not be fully recoverable"],"requires":["Kotlin 1.4+ with metadata enabled in compilation","kotlinx-metadata library on classpath","Kotlin reflection library (kotlin-reflect)","Access to compiled .class files with Kotlin metadata"],"input_types":["KClass<T> instances from Kotlin reflection","Compiled .class files with Kotlin metadata","KotlinMetadata annotations on classes"],"output_types":["Generated .kt files based on runtime metadata","Code generated at runtime or during build"],"categories":["code-generation-editing","memory-knowledge"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-square--kotlinpoet__cap_5","uri":"capability://code.generation.editing.javapoet.interoperability.for.java.kotlin.code.generation","name":"javapoet interoperability for java-kotlin code generation","description":"Provides seamless integration with JavaPoet (Square's Java code generation library) by allowing KotlinPoet to generate Kotlin code that interoperates with JavaPoet-generated Java code. The integration includes automatic conversion between JavaPoet TypeName objects and KotlinPoet TypeName objects, enabling mixed Java-Kotlin code generation pipelines. This allows developers to generate both Java and Kotlin code from a single code generation process, with proper handling of type compatibility and import statements across both languages.","intents":["Generate Kotlin wrappers around JavaPoet-generated Java classes","Create mixed Java-Kotlin libraries with consistent code generation","Migrate Java code generation pipelines to Kotlin incrementally","Generate Kotlin extension functions for JavaPoet-generated Java APIs"],"best_for":["Teams maintaining both Java and Kotlin codebases","Framework authors supporting multiple JVM languages","Developers migrating from pure Java to Kotlin incrementally"],"limitations":["Type name conversion is one-way in some cases — not all Kotlin types have direct Java equivalents (e.g., extension functions, data classes)","Interop requires careful handling of nullability — Java's @Nullable/@NotNull annotations must be manually mapped to Kotlin's nullable types","Package and import management becomes complex when generating both Java and Kotlin code in the same pipeline"],"requires":["JavaPoet library on classpath (com.squareup:javapoet:1.13.0+)","KotlinPoet library with JavaPoet integration support","Understanding of both Java and Kotlin type systems"],"input_types":["JavaPoet TypeName objects","JavaPoet ClassName references","Mixed Java and Kotlin type specifications"],"output_types":["Generated .kt files that reference JavaPoet-generated .java files","Converted TypeName objects compatible with both libraries"],"categories":["code-generation-editing","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-square--kotlinpoet__cap_6","uri":"capability://code.generation.editing.enum.and.sealed.class.generation.with.member.variants","name":"enum and sealed class generation with member variants","description":"Generates Kotlin enums and sealed classes with support for enum constants, sealed subclasses, and associated properties/functions. The API allows defining enum entries with custom properties and functions, and sealed class hierarchies with multiple subclass variants. Each enum entry or sealed subclass can have its own implementation of abstract members, enabling the generation of complex algebraic data types and pattern-matching-friendly hierarchies.","intents":["Generate type-safe enum classes with associated data","Create sealed class hierarchies for domain modeling","Generate discriminated union types for error handling","Build code generators for state machines or workflow definitions"],"best_for":["Developers generating domain models with algebraic data types","Framework authors creating DSLs with sealed class hierarchies","Teams building code generators for state machines or workflows"],"limitations":["Enum entries cannot have different constructor signatures — all entries must use the same constructor parameters","Sealed class generation requires explicit definition of each subclass variant — no automatic variant generation from metadata","No built-in support for generating pattern matching exhaustiveness checks"],"requires":["KotlinPoet library with TypeSpec.Kind.ENUM and TypeSpec.Kind.CLASS support","Kotlin 1.0+ for sealed classes, Kotlin 1.1+ for sealed interfaces"],"input_types":["Enum entry definitions with properties","Sealed subclass specifications","Member function and property definitions"],"output_types":["Generated .kt files with enum or sealed class declarations","Kotlin code with pattern-matching-friendly hierarchies"],"categories":["code-generation-editing","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-square--kotlinpoet__cap_7","uri":"capability://code.generation.editing.extension.function.and.property.generation","name":"extension function and property generation","description":"Generates Kotlin extension functions and extension properties that extend existing types without modifying their source code. The API allows defining receiver types, function signatures, and implementation code blocks for extensions. This enables code generators to create utility functions, DSLs, and fluent APIs that appear as methods on existing classes, including types from external libraries.","intents":["Generate DSL extension functions for fluent API construction","Create utility extension functions for common operations","Build code generators for framework-specific extensions","Generate extension properties for computed values"],"best_for":["Framework authors creating DSLs and fluent APIs","Developers generating utility extensions for domain models","Teams building code generators for framework-specific extensions"],"limitations":["Extension functions are resolved at compile time based on import scope — generated extensions must be imported to be used","No built-in support for extension function overloading resolution — ambiguities must be resolved manually","Extension properties cannot have backing fields — only computed properties with getters/setters are supported"],"requires":["KotlinPoet library with FunSpec and PropertySpec support","Kotlin 1.0+ for extension functions, Kotlin 1.1+ for extension properties"],"input_types":["Receiver type (ClassName or TypeName)","Function signature and implementation","Property getter/setter implementations"],"output_types":["Generated .kt files with extension function declarations","Kotlin code with extension properties"],"categories":["code-generation-editing","text-generation-language"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-square--kotlinpoet__cap_8","uri":"capability://code.generation.editing.data.class.and.value.class.generation.with.constructor.synthesis","name":"data class and value class generation with constructor synthesis","description":"Generates Kotlin data classes and value classes with automatic synthesis of copy(), equals(), hashCode(), and toString() methods. The API allows defining properties with default values, and the generated data class automatically includes all boilerplate methods. For value classes (inline classes), the generator handles the single-property constraint and generates appropriate wrapper semantics.","intents":["Generate data classes from metadata or configuration","Create value classes for type-safe wrappers around primitives","Build code generators for domain models with automatic boilerplate","Generate immutable data structures with copy semantics"],"best_for":["Developers generating domain models and DTOs","Framework authors creating serialization/deserialization code","Teams building code generators for type-safe wrappers"],"limitations":["Data class generation does not automatically generate serialization code (e.g., toJson/fromJson) — must be added separately","Value class generation is limited to single-property classes — multi-property value classes are not supported","No built-in support for custom copy() implementations or copy() parameter validation"],"requires":["KotlinPoet library with TypeSpec.Kind.CLASS and PropertySpec support","Kotlin 1.0+ for data classes, Kotlin 1.5+ for value classes (inline classes)"],"input_types":["Property definitions with types and default values","Modifiers (val/var, private, etc.)","Constructor parameter specifications"],"output_types":["Generated .kt files with data class declarations","Kotlin code with synthesized copy(), equals(), hashCode(), toString()"],"categories":["code-generation-editing","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"github-square--kotlinpoet__cap_9","uri":"capability://code.generation.editing.companion.object.and.nested.type.generation","name":"companion object and nested type generation","description":"Generates companion objects within classes and nested types (classes, interfaces, objects, enums) within parent types. The API allows defining companion object members (functions, properties) that act as static-like declarations in Kotlin, and nested types that are scoped to their parent. This enables the generation of complex type hierarchies with proper encapsulation and namespace organization.","intents":["Generate factory functions in companion objects","Create nested data classes for domain model composition","Build code generators for type hierarchies with scoped types","Generate companion object constants and utilities"],"best_for":["Developers generating complex domain models with nested types","Framework authors creating factory patterns and builders","Teams building code generators for type hierarchies"],"limitations":["Companion objects are limited to one per class — multiple companion objects are not supported","Nested type visibility is not automatically managed — must be explicitly specified (private, internal, etc.)","No built-in support for nested companion objects (companion objects within nested types)"],"requires":["KotlinPoet library with TypeSpec support for nested types","Kotlin 1.0+ for companion objects"],"input_types":["Parent type specification","Nested type definitions","Companion object member specifications"],"output_types":["Generated .kt files with nested type declarations","Kotlin code with companion objects and scoped types"],"categories":["code-generation-editing","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":42,"verified":false,"data_access_risk":"high","permissions":["Kotlin 1.4+ or Java 8+","KotlinPoet library on classpath (Maven Central: com.squareup:kotlinpoet:2.2.0+)","Basic understanding of Kotlin type system and syntax","Understanding of Kotlin generics and type variance","KotlinPoet library with TypeName classes available","Optional: Kotlin reflection or KSP for extracting type information from existing code","KotlinPoet library with FileSpec support","Package name specification for generated files","KotlinPoet library with modifier and annotation support","Understanding of Kotlin modifiers and their semantics"],"failure_modes":["Builder pattern requires explicit construction of each code element — no shorthand for complex nested structures","No built-in support for formatting preferences beyond basic indentation control","Limited to Kotlin syntax generation only — cannot generate Java files directly (though JavaPoet interop exists)","Type names are representation-only — no runtime type checking or validation against actual classpath types","Variance modifiers (in/out) are syntactic only — no enforcement of Liskov substitution principle at generation time","No built-in support for intersection types or union types (Kotlin doesn't have these natively)","Import management is automatic but not customizable — no support for import aliases or custom import ordering","Star imports (import java.util.*) are not generated automatically — all types must be explicitly imported","No built-in support for suppressing imports or managing conflicting type names from different packages","Modifier validation is basic — some invalid combinations may not be caught at generation time","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.5599143045370939,"quality":0.35,"ecosystem":0.48999999999999994,"match_graph":0.25,"freshness":0.75,"weights":{"adoption":0.3,"quality":0.2,"ecosystem":0.15,"match_graph":0.3,"freshness":0.05}},"observed_outcomes":{"matches":0,"success_rate":0,"avg_confidence":0,"top_intents":[],"last_matched_at":null},"maintenance":{"status":"active","updated_at":"2026-05-24T12:16:22.064Z","last_scraped_at":"2026-05-03T13:58:37.060Z","last_commit":"2026-04-29T02:26:06Z"},"community":{"stars":4133,"forks":307,"weekly_downloads":null,"model_downloads":null,"model_likes":null}},"distribution":{"claim_url":"https://unfragile.ai/submit?claim=square--kotlinpoet","compare_url":"https://unfragile.ai/compare?artifact=square--kotlinpoet"}},"signature":"an5JbfBZDbKADKr4QGETwQKiuI5qsaouAKHibivUm4AhCcjIdJusAgZmZJJznCs8cty6u94xN5OstvQmM013DA==","signedAt":"2026-06-21T02:24:41.429Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/square--kotlinpoet","artifact":"https://unfragile.ai/square--kotlinpoet","verify":"https://unfragile.ai/api/v1/verify?slug=square--kotlinpoet","publicKey":"https://unfragile.ai/api/v1/trust-passport-public-key","spec":"https://unfragile.ai/trust","schema":"https://unfragile.ai/schema.json","docs":"https://unfragile.ai/docs"}}