[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill-jetbrains-jpa-spring-data-kotlin-mapper":3,"mdc--km2qy4-key":39,"related-org-jetbrains-jpa-spring-data-kotlin-mapper":564,"related-repo-jetbrains-jpa-spring-data-kotlin-mapper":697},{"slug":4,"name":4,"fn":5,"description":6,"org":7,"tags":11,"stars":28,"repoUrl":29,"updatedAt":30,"license":31,"forks":32,"topics":33,"repo":34,"sourceUrl":37,"mdContent":38},"jpa-spring-data-kotlin-mapper","model JPA persistence for Kotlin applications","Model Kotlin persistence code correctly for Spring Data JPA and Hibernate, including entity design, relationships, fetch plans, repository queries, lazy loading, and common performance traps. Use when creating or reviewing entities and repositories, diagnosing N+1 or `LazyInitializationException`, placing indexes and uniqueness rules, or preventing Kotlin-specific ORM bugs such as `data class` entities and broken `equals` or `hashCode`.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},"jetbrains","JetBrains","https:\u002F\u002Fpexgzepcugksgbtrxkhf.supabase.co\u002Fstorage\u002Fv1\u002Fobject\u002Fpublic\u002Forg-logos\u002Fjetbrains.png",[12,16,19,22,25],{"name":13,"slug":14,"type":15},"Kotlin","kotlin","tag",{"name":17,"slug":18,"type":15},"Spring","spring",{"name":20,"slug":21,"type":15},"Database","database",{"name":23,"slug":24,"type":15},"ORM","orm",{"name":26,"slug":27,"type":15},"PostgreSQL","postgresql",252,"https:\u002F\u002Fgithub.com\u002FJetBrains\u002Fskills","2026-07-13T06:42:08.840279",null,17,[],{"repoUrl":29,"stars":28,"forks":32,"topics":35,"description":36},[],"Curated agent skills collection verified by JetBrains","https:\u002F\u002Fgithub.com\u002FJetBrains\u002Fskills\u002Ftree\u002FHEAD\u002Fjpa-spring-data-kotlin-mapper","---\nname: jpa-spring-data-kotlin-mapper\ndescription: Model Kotlin persistence code correctly for Spring Data JPA and Hibernate, including entity design, relationships, fetch plans, repository queries, lazy loading, and common performance traps. Use when creating or reviewing entities and repositories, diagnosing N+1 or `LazyInitializationException`, placing indexes and uniqueness rules, or preventing Kotlin-specific ORM bugs such as `data class` entities and broken `equals` or `hashCode`.\nmetadata:\n  short-description: \"Model Kotlin persistence correctly\"\n  author: Kotlin\n  source: https:\u002F\u002Fgithub.com\u002FKotlin\u002Fkotlin-backend-agent-skills\u002Ftree\u002Fmain\u002F.agents\u002Fskills\u002Fjpa-spring-data-kotlin-mapper\n---\n\n# JPA Spring Data Kotlin Mapper\n\nSource mapping: Tier 1 critical skill derived from `Kotlin_Spring_Developer_Pipeline.md` (`SK-10`).\n\n## Mission\n\nGenerate and review persistence mappings that are correct for both Hibernate semantics and Kotlin semantics.\nPrevent bugs that compile cleanly but fail under lazy loading, dirty checking, identity comparison, or query load.\n\n## Read First\n\n- Entity classes and mapped superclasses.\n- Repository interfaces and custom queries.\n- Relevant service methods and transaction boundaries.\n- SQL logs, execution plans, or symptoms such as N+1, deadlocks, or stale reads.\n- Build files to verify JPA-related Kotlin compiler plugins.\n\n## Entity Design Rules\n\n- Do not generate JPA entities as `data class`.\n- Keep transport DTOs and persistence entities separate unless the repository clearly uses a shared model on purpose.\n- Model required columns as non-null only when object construction and persistence lifecycle make that safe.\n- Treat lazy associations and optional associations carefully. Nullable is often the honest model.\n- Use `lateinit` only when the project already accepts that tradeoff and the lifecycle is safe.\n\n## Identity And Equality Rules\n\n- Never accept all-field `equals` and `hashCode` generated by a `data class` entity.\n- Follow project conventions when they already define an entity identity strategy.\n- If no convention exists, choose an identity approach that is stable under persistence and proxying, then explain the tradeoff.\n- Be explicit about mutable fields and lazy associations when discussing equality semantics.\n\n## Query And Fetch Rules\n\n- Diagnose N+1 by looking at actual query count or SQL logs, not by guessing from annotations alone.\n- Prefer targeted fetch solutions:\n  - `@EntityGraph`\n  - `JOIN FETCH`\n  - batch fetching\n  - DTO projection\n- Be careful with collection fetch joins plus pagination. Call out the tradeoff instead of hiding it.\n- Use indexes and uniqueness constraints to support real query patterns and idempotency guarantees.\n\n## Advanced ORM Traps\n\n- Maintain both sides of bidirectional associations in domain methods or helper functions. Half-updated object graphs are a common source of subtle bugs.\n- `orphanRemoval` and cascade remove are not interchangeable. Explain the lifecycle semantics before choosing one.\n- `toString`, debug logging, JSON serialization, and IDE inspection can trigger lazy loads. Treat them as potential side effects, not harmless utilities.\n- Bulk update or delete queries bypass the persistence context and lifecycle callbacks. Call out when subsequent reads may be stale until clear or reload.\n- Multiple bag fetches can explode under Hibernate. If a collection-heavy fetch plan looks \"obviously convenient,\" verify whether the ORM can execute it safely.\n- `Set`-based collections plus mutable equality are especially dangerous. Collection membership can break after entity state changes.\n- `@Version` is usually the clearest optimistic concurrency mechanism when concurrent updates matter. Mention it explicitly when the use case can lose updates.\n- If `open-in-view` is disabled, DTO mapping that touches lazy fields must happen inside a deliberate transaction boundary.\n\n## Expert Heuristics\n\n- Choose entity shape for write correctness first and read shape second. If reads need a different shape, use projections or dedicated queries.\n- If a query is hot and read-only, DTO projection is often a better optimization than tuning entity graphs indefinitely.\n- If a relationship exists only to simplify one query, question whether it belongs in the entity model or in a query model.\n- Treat database indexes as part of the persistence design, not as a late production optimization.\n\n## Kotlin-Specific Checks\n\n- Verify `kotlin(\"plugin.jpa\")` or equivalent no-arg support when JPA entities exist.\n- Verify classes and members are compatible with proxying where needed.\n- Verify nullability reflects database truth rather than wishful API design.\n- Verify repository return types and service expectations agree on null handling.\n\n## Output Contract\n\nReturn these sections:\n\n- `Persistence model`: the entity and relationship shape that should exist.\n- `Correctness risks`: identity, lazy loading, transactional access, and nullability traps.\n- `Performance risks`: N+1, fetch plan, query shape, pagination, and index concerns.\n- `Recommended changes`: entity, repository, and query updates in minimal-diff form.\n- `Verification`: tests or SQL-level checks that confirm the mapping works as intended.\n\n## Guardrails\n\n- Do not recommend `FetchType.EAGER` everywhere to silence lazy loading symptoms.\n- Do not expose entities directly through API responses by default.\n- Do not use `data class` entities.\n- Do not claim an N+1 fix without explaining how the fetch plan changes query behavior.\n- Do not place all persistence intelligence in repositories if the service layer controls the real access pattern.\n\n## Quality Bar\n\nA good run of this skill improves correctness and query behavior together.\nA bad run proposes mappings that look neat in Kotlin but violate JPA identity, proxy, or loading semantics.\n",{"data":40,"body":44},{"name":4,"description":6,"metadata":41},{"short-description":42,"author":13,"source":43},"Model Kotlin persistence correctly","https:\u002F\u002Fgithub.com\u002FKotlin\u002Fkotlin-backend-agent-skills\u002Ftree\u002Fmain\u002F.agents\u002Fskills\u002Fjpa-spring-data-kotlin-mapper",{"type":45,"children":46},"root",[47,55,78,85,90,96,126,132,176,182,228,234,288,294,369,375,398,404,435,441,446,504,510,553,559],{"type":48,"tag":49,"props":50,"children":51},"element","h1",{"id":4},[52],{"type":53,"value":54},"text","JPA Spring Data Kotlin Mapper",{"type":48,"tag":56,"props":57,"children":58},"p",{},[59,61,68,70,76],{"type":53,"value":60},"Source mapping: Tier 1 critical skill derived from ",{"type":48,"tag":62,"props":63,"children":65},"code",{"className":64},[],[66],{"type":53,"value":67},"Kotlin_Spring_Developer_Pipeline.md",{"type":53,"value":69}," (",{"type":48,"tag":62,"props":71,"children":73},{"className":72},[],[74],{"type":53,"value":75},"SK-10",{"type":53,"value":77},").",{"type":48,"tag":79,"props":80,"children":82},"h2",{"id":81},"mission",[83],{"type":53,"value":84},"Mission",{"type":48,"tag":56,"props":86,"children":87},{},[88],{"type":53,"value":89},"Generate and review persistence mappings that are correct for both Hibernate semantics and Kotlin semantics.\nPrevent bugs that compile cleanly but fail under lazy loading, dirty checking, identity comparison, or query load.",{"type":48,"tag":79,"props":91,"children":93},{"id":92},"read-first",[94],{"type":53,"value":95},"Read First",{"type":48,"tag":97,"props":98,"children":99},"ul",{},[100,106,111,116,121],{"type":48,"tag":101,"props":102,"children":103},"li",{},[104],{"type":53,"value":105},"Entity classes and mapped superclasses.",{"type":48,"tag":101,"props":107,"children":108},{},[109],{"type":53,"value":110},"Repository interfaces and custom queries.",{"type":48,"tag":101,"props":112,"children":113},{},[114],{"type":53,"value":115},"Relevant service methods and transaction boundaries.",{"type":48,"tag":101,"props":117,"children":118},{},[119],{"type":53,"value":120},"SQL logs, execution plans, or symptoms such as N+1, deadlocks, or stale reads.",{"type":48,"tag":101,"props":122,"children":123},{},[124],{"type":53,"value":125},"Build files to verify JPA-related Kotlin compiler plugins.",{"type":48,"tag":79,"props":127,"children":129},{"id":128},"entity-design-rules",[130],{"type":53,"value":131},"Entity Design Rules",{"type":48,"tag":97,"props":133,"children":134},{},[135,148,153,158,163],{"type":48,"tag":101,"props":136,"children":137},{},[138,140,146],{"type":53,"value":139},"Do not generate JPA entities as ",{"type":48,"tag":62,"props":141,"children":143},{"className":142},[],[144],{"type":53,"value":145},"data class",{"type":53,"value":147},".",{"type":48,"tag":101,"props":149,"children":150},{},[151],{"type":53,"value":152},"Keep transport DTOs and persistence entities separate unless the repository clearly uses a shared model on purpose.",{"type":48,"tag":101,"props":154,"children":155},{},[156],{"type":53,"value":157},"Model required columns as non-null only when object construction and persistence lifecycle make that safe.",{"type":48,"tag":101,"props":159,"children":160},{},[161],{"type":53,"value":162},"Treat lazy associations and optional associations carefully. Nullable is often the honest model.",{"type":48,"tag":101,"props":164,"children":165},{},[166,168,174],{"type":53,"value":167},"Use ",{"type":48,"tag":62,"props":169,"children":171},{"className":170},[],[172],{"type":53,"value":173},"lateinit",{"type":53,"value":175}," only when the project already accepts that tradeoff and the lifecycle is safe.",{"type":48,"tag":79,"props":177,"children":179},{"id":178},"identity-and-equality-rules",[180],{"type":53,"value":181},"Identity And Equality Rules",{"type":48,"tag":97,"props":183,"children":184},{},[185,213,218,223],{"type":48,"tag":101,"props":186,"children":187},{},[188,190,196,198,204,206,211],{"type":53,"value":189},"Never accept all-field ",{"type":48,"tag":62,"props":191,"children":193},{"className":192},[],[194],{"type":53,"value":195},"equals",{"type":53,"value":197}," and ",{"type":48,"tag":62,"props":199,"children":201},{"className":200},[],[202],{"type":53,"value":203},"hashCode",{"type":53,"value":205}," generated by a ",{"type":48,"tag":62,"props":207,"children":209},{"className":208},[],[210],{"type":53,"value":145},{"type":53,"value":212}," entity.",{"type":48,"tag":101,"props":214,"children":215},{},[216],{"type":53,"value":217},"Follow project conventions when they already define an entity identity strategy.",{"type":48,"tag":101,"props":219,"children":220},{},[221],{"type":53,"value":222},"If no convention exists, choose an identity approach that is stable under persistence and proxying, then explain the tradeoff.",{"type":48,"tag":101,"props":224,"children":225},{},[226],{"type":53,"value":227},"Be explicit about mutable fields and lazy associations when discussing equality semantics.",{"type":48,"tag":79,"props":229,"children":231},{"id":230},"query-and-fetch-rules",[232],{"type":53,"value":233},"Query And Fetch Rules",{"type":48,"tag":97,"props":235,"children":236},{},[237,242,278,283],{"type":48,"tag":101,"props":238,"children":239},{},[240],{"type":53,"value":241},"Diagnose N+1 by looking at actual query count or SQL logs, not by guessing from annotations alone.",{"type":48,"tag":101,"props":243,"children":244},{},[245,247],{"type":53,"value":246},"Prefer targeted fetch solutions:\n",{"type":48,"tag":97,"props":248,"children":249},{},[250,259,268,273],{"type":48,"tag":101,"props":251,"children":252},{},[253],{"type":48,"tag":62,"props":254,"children":256},{"className":255},[],[257],{"type":53,"value":258},"@EntityGraph",{"type":48,"tag":101,"props":260,"children":261},{},[262],{"type":48,"tag":62,"props":263,"children":265},{"className":264},[],[266],{"type":53,"value":267},"JOIN FETCH",{"type":48,"tag":101,"props":269,"children":270},{},[271],{"type":53,"value":272},"batch fetching",{"type":48,"tag":101,"props":274,"children":275},{},[276],{"type":53,"value":277},"DTO projection",{"type":48,"tag":101,"props":279,"children":280},{},[281],{"type":53,"value":282},"Be careful with collection fetch joins plus pagination. Call out the tradeoff instead of hiding it.",{"type":48,"tag":101,"props":284,"children":285},{},[286],{"type":53,"value":287},"Use indexes and uniqueness constraints to support real query patterns and idempotency guarantees.",{"type":48,"tag":79,"props":289,"children":291},{"id":290},"advanced-orm-traps",[292],{"type":53,"value":293},"Advanced ORM Traps",{"type":48,"tag":97,"props":295,"children":296},{},[297,302,313,324,329,334,345,356],{"type":48,"tag":101,"props":298,"children":299},{},[300],{"type":53,"value":301},"Maintain both sides of bidirectional associations in domain methods or helper functions. Half-updated object graphs are a common source of subtle bugs.",{"type":48,"tag":101,"props":303,"children":304},{},[305,311],{"type":48,"tag":62,"props":306,"children":308},{"className":307},[],[309],{"type":53,"value":310},"orphanRemoval",{"type":53,"value":312}," and cascade remove are not interchangeable. Explain the lifecycle semantics before choosing one.",{"type":48,"tag":101,"props":314,"children":315},{},[316,322],{"type":48,"tag":62,"props":317,"children":319},{"className":318},[],[320],{"type":53,"value":321},"toString",{"type":53,"value":323},", debug logging, JSON serialization, and IDE inspection can trigger lazy loads. Treat them as potential side effects, not harmless utilities.",{"type":48,"tag":101,"props":325,"children":326},{},[327],{"type":53,"value":328},"Bulk update or delete queries bypass the persistence context and lifecycle callbacks. Call out when subsequent reads may be stale until clear or reload.",{"type":48,"tag":101,"props":330,"children":331},{},[332],{"type":53,"value":333},"Multiple bag fetches can explode under Hibernate. If a collection-heavy fetch plan looks \"obviously convenient,\" verify whether the ORM can execute it safely.",{"type":48,"tag":101,"props":335,"children":336},{},[337,343],{"type":48,"tag":62,"props":338,"children":340},{"className":339},[],[341],{"type":53,"value":342},"Set",{"type":53,"value":344},"-based collections plus mutable equality are especially dangerous. Collection membership can break after entity state changes.",{"type":48,"tag":101,"props":346,"children":347},{},[348,354],{"type":48,"tag":62,"props":349,"children":351},{"className":350},[],[352],{"type":53,"value":353},"@Version",{"type":53,"value":355}," is usually the clearest optimistic concurrency mechanism when concurrent updates matter. Mention it explicitly when the use case can lose updates.",{"type":48,"tag":101,"props":357,"children":358},{},[359,361,367],{"type":53,"value":360},"If ",{"type":48,"tag":62,"props":362,"children":364},{"className":363},[],[365],{"type":53,"value":366},"open-in-view",{"type":53,"value":368}," is disabled, DTO mapping that touches lazy fields must happen inside a deliberate transaction boundary.",{"type":48,"tag":79,"props":370,"children":372},{"id":371},"expert-heuristics",[373],{"type":53,"value":374},"Expert Heuristics",{"type":48,"tag":97,"props":376,"children":377},{},[378,383,388,393],{"type":48,"tag":101,"props":379,"children":380},{},[381],{"type":53,"value":382},"Choose entity shape for write correctness first and read shape second. If reads need a different shape, use projections or dedicated queries.",{"type":48,"tag":101,"props":384,"children":385},{},[386],{"type":53,"value":387},"If a query is hot and read-only, DTO projection is often a better optimization than tuning entity graphs indefinitely.",{"type":48,"tag":101,"props":389,"children":390},{},[391],{"type":53,"value":392},"If a relationship exists only to simplify one query, question whether it belongs in the entity model or in a query model.",{"type":48,"tag":101,"props":394,"children":395},{},[396],{"type":53,"value":397},"Treat database indexes as part of the persistence design, not as a late production optimization.",{"type":48,"tag":79,"props":399,"children":401},{"id":400},"kotlin-specific-checks",[402],{"type":53,"value":403},"Kotlin-Specific Checks",{"type":48,"tag":97,"props":405,"children":406},{},[407,420,425,430],{"type":48,"tag":101,"props":408,"children":409},{},[410,412,418],{"type":53,"value":411},"Verify ",{"type":48,"tag":62,"props":413,"children":415},{"className":414},[],[416],{"type":53,"value":417},"kotlin(\"plugin.jpa\")",{"type":53,"value":419}," or equivalent no-arg support when JPA entities exist.",{"type":48,"tag":101,"props":421,"children":422},{},[423],{"type":53,"value":424},"Verify classes and members are compatible with proxying where needed.",{"type":48,"tag":101,"props":426,"children":427},{},[428],{"type":53,"value":429},"Verify nullability reflects database truth rather than wishful API design.",{"type":48,"tag":101,"props":431,"children":432},{},[433],{"type":53,"value":434},"Verify repository return types and service expectations agree on null handling.",{"type":48,"tag":79,"props":436,"children":438},{"id":437},"output-contract",[439],{"type":53,"value":440},"Output Contract",{"type":48,"tag":56,"props":442,"children":443},{},[444],{"type":53,"value":445},"Return these sections:",{"type":48,"tag":97,"props":447,"children":448},{},[449,460,471,482,493],{"type":48,"tag":101,"props":450,"children":451},{},[452,458],{"type":48,"tag":62,"props":453,"children":455},{"className":454},[],[456],{"type":53,"value":457},"Persistence model",{"type":53,"value":459},": the entity and relationship shape that should exist.",{"type":48,"tag":101,"props":461,"children":462},{},[463,469],{"type":48,"tag":62,"props":464,"children":466},{"className":465},[],[467],{"type":53,"value":468},"Correctness risks",{"type":53,"value":470},": identity, lazy loading, transactional access, and nullability traps.",{"type":48,"tag":101,"props":472,"children":473},{},[474,480],{"type":48,"tag":62,"props":475,"children":477},{"className":476},[],[478],{"type":53,"value":479},"Performance risks",{"type":53,"value":481},": N+1, fetch plan, query shape, pagination, and index concerns.",{"type":48,"tag":101,"props":483,"children":484},{},[485,491],{"type":48,"tag":62,"props":486,"children":488},{"className":487},[],[489],{"type":53,"value":490},"Recommended changes",{"type":53,"value":492},": entity, repository, and query updates in minimal-diff form.",{"type":48,"tag":101,"props":494,"children":495},{},[496,502],{"type":48,"tag":62,"props":497,"children":499},{"className":498},[],[500],{"type":53,"value":501},"Verification",{"type":53,"value":503},": tests or SQL-level checks that confirm the mapping works as intended.",{"type":48,"tag":79,"props":505,"children":507},{"id":506},"guardrails",[508],{"type":53,"value":509},"Guardrails",{"type":48,"tag":97,"props":511,"children":512},{},[513,526,531,543,548],{"type":48,"tag":101,"props":514,"children":515},{},[516,518,524],{"type":53,"value":517},"Do not recommend ",{"type":48,"tag":62,"props":519,"children":521},{"className":520},[],[522],{"type":53,"value":523},"FetchType.EAGER",{"type":53,"value":525}," everywhere to silence lazy loading symptoms.",{"type":48,"tag":101,"props":527,"children":528},{},[529],{"type":53,"value":530},"Do not expose entities directly through API responses by default.",{"type":48,"tag":101,"props":532,"children":533},{},[534,536,541],{"type":53,"value":535},"Do not use ",{"type":48,"tag":62,"props":537,"children":539},{"className":538},[],[540],{"type":53,"value":145},{"type":53,"value":542}," entities.",{"type":48,"tag":101,"props":544,"children":545},{},[546],{"type":53,"value":547},"Do not claim an N+1 fix without explaining how the fetch plan changes query behavior.",{"type":48,"tag":101,"props":549,"children":550},{},[551],{"type":53,"value":552},"Do not place all persistence intelligence in repositories if the service layer controls the real access pattern.",{"type":48,"tag":79,"props":554,"children":556},{"id":555},"quality-bar",[557],{"type":53,"value":558},"Quality Bar",{"type":48,"tag":56,"props":560,"children":561},{},[562],{"type":53,"value":563},"A good run of this skill improves correctness and query behavior together.\nA bad run proposes mappings that look neat in Kotlin but violate JPA identity, proxy, or loading semantics.",{"items":565,"total":696},[566,584,593,602,613,623,636,645,654,664,673,686],{"slug":567,"name":567,"fn":568,"description":569,"org":570,"tags":571,"stars":581,"repoUrl":582,"updatedAt":583},"mps-aspect-accessories","configure JetBrains MPS module dependencies","Wire MPS module and model dependencies, used languages, used devkits, extended languages, runtime solutions, accessory models, and language\u002Fdependency versions. Use when adding\u002Fremoving module dependencies, importing languages or devkits into a model, declaring runtime solutions, or shipping accessory content visible to consumers without explicit import.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[572,575,578],{"name":573,"slug":574,"type":15},"Architecture","architecture",{"name":576,"slug":577,"type":15},"Configuration","configuration",{"name":579,"slug":580,"type":15},"Engineering","engineering",1650,"https:\u002F\u002Fgithub.com\u002FJetBrains\u002FMPS","2026-07-17T06:06:57.311661",{"slug":585,"name":585,"fn":586,"description":587,"org":588,"tags":589,"stars":581,"repoUrl":582,"updatedAt":592},"mps-aspect-actions","define and edit MPS node factories","Use when defining or editing MPS node factories (the \"actions\" aspect) — `NodeFactories` roots, per-concept `NodeFactory` setup functions that initialize a freshly created node and optionally copy data from a replaced `sampleNode`, plus the actions aspect's `CopyPasteHandlers` and `PasteWrappers` roots. Reach for this skill when a substitution, side transform, completion replacement, or `add new initialized(...)` should preserve fields from the node it is replacing, or when defaults set in a constructor are not enough.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[590,591],{"name":573,"slug":574,"type":15},{"name":579,"slug":580,"type":15},"2026-07-17T06:04:48.066901",{"slug":594,"name":594,"fn":595,"description":596,"org":597,"tags":598,"stars":581,"repoUrl":582,"updatedAt":601},"mps-aspect-behavior","define and edit MPS concept behavior","Use when defining or editing MPS `ConceptBehavior` — per-concept methods (non-virtual \u002F virtual \u002F abstract \u002F static \u002F virtual static), constructors, virtual dispatch (MRO), super and interface-default calls (`super\u003CInterface>.method`), overriding methods from `lang.core.behavior` interfaces such as `ScopeProvider.getScope` \u002F `INamedConcept.getName` \u002F `BaseConcept.getPresentation`, calling sibling methods (`LocalBehaviorMethodCall`) and behavior methods from other aspects via `node.method(...)`. Reach for this skill whenever the task involves authoring or modifying `\u003Clang>\u002FlanguageModels\u002Fbehavior.mps`.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[599,600],{"name":573,"slug":574,"type":15},{"name":579,"slug":580,"type":15},"2026-07-13T06:45:21.757084",{"slug":603,"name":603,"fn":604,"description":605,"org":606,"tags":607,"stars":581,"repoUrl":582,"updatedAt":612},"mps-aspect-constraints","define JetBrains MPS language constraints","Use when defining or editing MPS language constraints — property validators \u002F setters \u002F getters, referent search scopes (imperative or inherited via `ScopeProvider.getScope`), `referentSetHandler` side effects, default-scope blocks, `canBeChild` \u002F `canBeParent` \u002F `canBeAncestor` \u002F `canBeRoot` placement rules, `defaultConcreteConcept` for abstract concepts, `set \u003Cread-only>` and `{name}` aliasing, and scope helpers (`SimpleRoleScope`, `ListScope`, `CompositeScope`, `HidingByNameScope`). Reach for this skill whenever the task involves authoring or modifying `\u003Clang>\u002FlanguageModels\u002Fconstraints.mps`.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[608,609],{"name":573,"slug":574,"type":15},{"name":610,"slug":611,"type":15},"Code Analysis","code-analysis","2026-07-23T05:41:33.639365",{"slug":614,"name":614,"fn":615,"description":616,"org":617,"tags":618,"stars":581,"repoUrl":582,"updatedAt":622},"mps-aspect-dataflow","define and debug MPS dataflow builders","Use when defining or debugging MPS dataflow builders for a concept — control\u002Fdata flow declarations that drive reachability analysis and variable-use checking. Covers DataFlowBuilderDeclaration, BuilderBlock, emit instructions (code for, jump, ifjump, label, read, write, ret, mayBeUnreachable), positions (AfterPosition, BeforePosition, LabelPosition), the jetbrains.mps.lang.dataFlow language, the NodeParameter implicit, BL+smodel usage inside builder bodies, and IBuilderMode for advanced analyses such as nullable\u002Fnon-null tracking.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[619],{"name":620,"slug":621,"type":15},"Data Analysis","data-analysis","2026-07-13T06:45:19.114674",{"slug":624,"name":624,"fn":625,"description":626,"org":627,"tags":628,"stars":581,"repoUrl":582,"updatedAt":635},"mps-aspect-editor","define MPS editor layouts","Use when creating or changing MPS editor definitions — the overall workflow from scaffolding a `ConceptEditorDeclaration` through componentizing reusable `EditorComponentDeclaration`s, refining cell models and cell layouts, applying style sheets and indent-layout style items, wiring smart references, leveraging inheritance via super-concepts and interfaces, inspecting (`print_node_json`, `show_node_representation`) and validating (`check_root_node_problems`). Covers `jetbrains.mps.lang.editor` cell models (`CellModel_RefNode`\u002F`CellModel_RefNodeList`\u002F`CellModel_RefCell`\u002F`CellModel_Property`\u002F`CellModel_Constant`), layout choices, and JSON blueprints for common editor shapes. For the non-layout side (action maps, keymaps, transformation\u002Fsubstitute menus) use `mps-aspect-editor-menus-and-keymaps`.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[629,632],{"name":630,"slug":631,"type":15},"Design","design",{"name":633,"slug":634,"type":15},"UI Components","ui-components","2026-07-23T05:41:56.638151",{"slug":637,"name":637,"fn":638,"description":639,"org":640,"tags":641,"stars":581,"repoUrl":582,"updatedAt":644},"mps-aspect-editor-menus-and-keymaps","author MPS editor menus and keymaps","Use when authoring the **non-layout** parts of the MPS editor aspect — what happens when the user types, presses a key, triggers completion, pastes, or invokes a context action. Covers action maps (`CellActionMapDeclaration`), cell keymaps (`CellKeyMapDeclaration`), transformation menus (`TransformationMenu_Default` \u002F `_Named` \u002F `_Contribution`), substitute menus (`SubstituteMenu_Default` \u002F `SubstituteMenu` \u002F contributions), side transforms (LEFT\u002FRIGHT), legacy cell menus, paste wrappers and copy-paste handlers (in the actions language), completion styling, reference presentation, two-step deletion, and the editor selection API. Trigger terms: `actionMap`, `keyMap`, `delete_action_id`, `transformationMenu`, `substituteMenu`, `Ctrl+Space`, `Ctrl+Alt+B`, side transform, paste wrapper, completion styling, `PasteWrappers`, `CopyPasteHandlers`. For the **layout** side (cells, layouts, style sheets) use `mps-aspect-editor` instead.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[642,643],{"name":579,"slug":580,"type":15},{"name":633,"slug":634,"type":15},"2026-07-23T05:41:49.666535",{"slug":646,"name":646,"fn":647,"description":648,"org":649,"tags":650,"stars":581,"repoUrl":582,"updatedAt":653},"mps-aspect-generation-plan","modify MPS generation plans","Use when defining or modifying an MPS generation plan — explicit ordering of generators, checkpoints for cross-model reference resolution, forks for parallel branches, IncludePlan composition, conditional PlanContribution activation, ParameterEquals\u002FConceptListSelector fork selectors, and InitModelAttributes for targetFacet routing. Apply when working with @genplan models, the jetbrains.mps.lang.generator.plan language, attaching plans via DevKits or the Custom generation facet, or debugging cross-model mapping label resolution.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[651,652],{"name":573,"slug":574,"type":15},{"name":579,"slug":580,"type":15},"2026-07-13T06:44:59.507855",{"slug":655,"name":655,"fn":656,"description":657,"org":658,"tags":659,"stars":581,"repoUrl":582,"updatedAt":663},"mps-aspect-generator","define JetBrains MPS generator rules","Use when defining or modifying MPS generators — author a generator module, add or edit root\u002Freduction\u002Fweaving\u002Fpattern mapping rules, attach template macros ($COPY_SRC, $LOOP, $IF, $PROPERTY, $REF, $SWITCH, $MAP_SRC, $WEAVE, $INSERT, $LABEL, $TRACE, $VAR), wire mapping labels, build template switches, write pre\u002Fpost mapping scripts, navigate `genContext`, or debug \"rule didn't fire\", missing references, empty output, infinite reduction loops, and generated-Java compile failures.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[660,661,662],{"name":573,"slug":574,"type":15},{"name":610,"slug":611,"type":15},{"name":579,"slug":580,"type":15},"2026-07-17T06:06:58.042999",{"slug":665,"name":665,"fn":666,"description":667,"org":668,"tags":669,"stars":581,"repoUrl":582,"updatedAt":672},"mps-aspect-intentions","define and edit MPS intentions","Use when defining or editing MPS intentions (the Alt+Enter context-action aspect) — adding `IntentionDeclaration` roots, parameterized or surround-with variants, description\u002FisApplicable\u002Fexecute blocks, child-filter functions, factory-initialized AST splicing, or debugging why an intention is not offered. Lives in the language's `intentions` model and uses `jetbrains.mps.lang.intentions`.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[670,671],{"name":573,"slug":574,"type":15},{"name":579,"slug":580,"type":15},"2026-07-23T05:41:48.692899",{"slug":674,"name":674,"fn":675,"description":676,"org":677,"tags":678,"stars":581,"repoUrl":582,"updatedAt":685},"mps-aspect-migrations","author and debug MPS migration scripts","Use when authoring or debugging MPS migration scripts that upgrade user models after a language definition changes — covers jetbrains.mps.lang.migration (MigrationScript class-based, PureMigrationScript declarative, MoveConcept\u002FMoveContainmentLink\u002FMoveReferenceLink\u002FMoveProperty, ordering via OrderDependency, data exchange via putData\u002FgetData, RefactoringLog, ConceptMigrationReference) and jetbrains.mps.lang.script Enhancement Scripts (MigrationScript with MigrationScriptPart_Instance, ExtractInterfaceMigration, FactoryMigrationScriptPart, CommentMigrationScriptPart) — when a model needs version-gated upgrade, concept rename or removal, link or property rename, instance-level transformation, or composition of migration steps.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[679,682],{"name":680,"slug":681,"type":15},"Debugging","debugging",{"name":683,"slug":684,"type":15},"Migration","migration","2026-07-13T06:45:20.372122",{"slug":687,"name":687,"fn":688,"description":689,"org":690,"tags":691,"stars":581,"repoUrl":582,"updatedAt":695},"mps-aspect-structure-concepts","define concepts in MPS structure aspect","Define concepts, interface concepts, enumerations, and constrained data types in an MPS language's `structure` aspect. Covers smart-reference detection, alias rules, cardinality, INamedConcept usage, bulk creation, and the full `mps_mcp_alter_structure` \u002F `mps_mcp_query_structure` reference. Use when authoring or modifying a language's structure model.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[692],{"name":693,"slug":694,"type":15},"Data Modeling","data-modeling","2026-07-23T05:41:30.705975",188,{"items":698,"total":812},[699,718,733,747,762,781,798],{"slug":700,"name":700,"fn":701,"description":702,"org":703,"tags":704,"stars":28,"repoUrl":29,"updatedAt":717},"algorithmic-art","create generative art with p5.js","Creating algorithmic art using p5.js with seeded randomness and interactive parameter exploration. Use this when users request creating art using code, generative art, algorithmic art, flow fields, or particle systems. Create original algorithmic art rather than copying existing artists' work to avoid copyright violations.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[705,708,711,714],{"name":706,"slug":707,"type":15},"Creative","creative",{"name":709,"slug":710,"type":15},"Generative Art","generative-art",{"name":712,"slug":713,"type":15},"Graphics","graphics",{"name":715,"slug":716,"type":15},"JavaScript","javascript","2026-07-13T06:41:35.540127",{"slug":719,"name":719,"fn":720,"description":721,"org":722,"tags":723,"stars":28,"repoUrl":29,"updatedAt":732},"antfu","configure JavaScript projects with Anthony Fu's tools","Anthony Fu's opinionated tooling and conventions for JavaScript\u002FTypeScript projects. Use when setting up new projects, configuring ESLint\u002FPrettier alternatives, monorepos, library publishing, or when the user mentions Anthony Fu's preferences.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[724,727,728,729],{"name":725,"slug":726,"type":15},"Best Practices","best-practices",{"name":579,"slug":580,"type":15},{"name":715,"slug":716,"type":15},{"name":730,"slug":731,"type":15},"TypeScript","typescript","2026-07-13T06:43:13.153309",{"slug":734,"name":734,"fn":735,"description":736,"org":737,"tags":738,"stars":28,"repoUrl":29,"updatedAt":746},"brand-guidelines","apply Anthropic brand guidelines","Applies Anthropic's official brand colors and typography to any sort of artifact that may benefit from having Anthropic's look-and-feel. Use it when brand colors or style guidelines, visual formatting, or company design standards apply.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[739,742,743],{"name":740,"slug":741,"type":15},"Branding","branding",{"name":630,"slug":631,"type":15},{"name":744,"slug":745,"type":15},"Typography","typography","2026-07-13T06:43:06.077629",{"slug":748,"name":748,"fn":749,"description":750,"org":751,"tags":752,"stars":28,"repoUrl":29,"updatedAt":761},"canvas-design","create visual art and design assets","Create beautiful visual art in .png and .pdf documents using design philosophy. You should use this skill when the user asks to create a poster, piece of art, design, or other static piece. Create original visual designs, never copying existing artists' work to avoid copyright violations.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[753,754,755,758],{"name":706,"slug":707,"type":15},{"name":630,"slug":631,"type":15},{"name":756,"slug":757,"type":15},"Images","images",{"name":759,"slug":760,"type":15},"PDF","pdf","2026-07-13T06:39:58.803113",{"slug":763,"name":763,"fn":764,"description":765,"org":766,"tags":767,"stars":28,"repoUrl":29,"updatedAt":780},"ci-cd-containerization-advisor","design CI\u002FCD pipelines for Kotlin applications","Design reproducible build, image, and deployment pipelines for Kotlin plus Spring applications, including CI verification, layered containers, rollout safety, and deployment-time migration coordination. Use when creating or improving Dockerfiles, CI workflows, image hardening, Kubernetes manifests, release gates, or deployment strategies for Spring Boot services, especially where build reproducibility and operational safety matter.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[768,771,774,777,778,779],{"name":769,"slug":770,"type":15},"CI\u002FCD","ci-cd",{"name":772,"slug":773,"type":15},"Containers","containers",{"name":775,"slug":776,"type":15},"Deployment","deployment",{"name":579,"slug":580,"type":15},{"name":13,"slug":14,"type":15},{"name":17,"slug":18,"type":15},"2026-07-13T06:41:47.83899",{"slug":782,"name":782,"fn":783,"description":784,"org":785,"tags":786,"stars":28,"repoUrl":29,"updatedAt":797},"cloudflare-deploy","deploy applications to Cloudflare","Deploy applications and infrastructure to Cloudflare using Workers, Pages, and related platform services. Use when the user asks to deploy, host, publish, or set up a project on Cloudflare.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[787,790,793,796],{"name":788,"slug":789,"type":15},"Cloudflare","cloudflare",{"name":791,"slug":792,"type":15},"Cloudflare Pages","cloudflare-pages",{"name":794,"slug":795,"type":15},"Cloudflare Workers","cloudflare-workers",{"name":775,"slug":776,"type":15},"2026-07-17T06:04:42.853896",{"slug":799,"name":799,"fn":800,"description":801,"org":802,"tags":803,"stars":28,"repoUrl":29,"updatedAt":811},"compose-ui-control","interact with Compose Desktop applications","Control a running Compose Desktop application via HTTP. Use when you need to interact with UI elements, click buttons, enter text, wait for elements to appear, or capture screenshots in a Compose Desktop app that has compose-ui-test-server enabled.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[804,807,810],{"name":805,"slug":806,"type":15},"Automation","automation",{"name":808,"slug":809,"type":15},"Desktop","desktop",{"name":633,"slug":634,"type":15},"2026-07-13T06:40:38.798626",128]