[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill-jetbrains-mps-language-inheritance":3,"mdc-lv0gjc-key":32,"related-org-jetbrains-mps-language-inheritance":555,"related-repo-jetbrains-mps-language-inheritance":680},{"slug":4,"name":4,"fn":5,"description":6,"org":7,"tags":11,"stars":19,"repoUrl":20,"updatedAt":21,"license":22,"forks":23,"topics":24,"repo":27,"sourceUrl":30,"mdContent":31},"mps-language-inheritance","analyze MPS language inheritance","Investigate inheritance between MPS languages and between concepts — extended languages, superconcepts, implemented interfaces, sub-\u002Fassignable concepts, and cross-language specialization. Use when tracing language hierarchies, finding extension points, or checking concept assignability.",{"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],{"name":13,"slug":14,"type":15},"Engineering","engineering","tag",{"name":17,"slug":18,"type":15},"Code Analysis","code-analysis",1650,"https:\u002F\u002Fgithub.com\u002FJetBrains\u002FMPS","2026-07-13T06:44:47.121541",null,311,[25,26],"domain-specific-language","dsl",{"repoUrl":20,"stars":19,"forks":23,"topics":28,"description":29},[25,26],"JetBrains Meta programming System","https:\u002F\u002Fgithub.com\u002FJetBrains\u002FMPS\u002Ftree\u002FHEAD\u002Fplugins\u002Fmcp-tools\u002Fresources\u002Fjetbrains\u002Fmps\u002Fagents\u002Fmcp\u002Fskills\u002Fmps-language-inheritance","---\nname: mps-language-inheritance\ndescription: Investigate inheritance between MPS languages and between concepts — extended languages, superconcepts, implemented interfaces, sub-\u002Fassignable concepts, and cross-language specialization. Use when tracing language hierarchies, finding extension points, or checking concept assignability.\ntype: reference\n---\n\n# MPS Language and Concept Inheritance\n\nTwo layers of inheritance matter in MPS: module-level (one language `extends` another) and concept-level (concepts inherit superconcepts and implement interface concepts).\n\n## Critical Directives\n\n- **Concept-level inheritance is realized through module-level extension** — different `languageReference` on a concept and its `superConcept` indicates a cross-language specialization, which usually requires the consumer's language to extend the parent.\n- **`GET_ALL_SUPERCONCEPTS`** gives the full transitive closure in a single call — prefer it over recursive walking of `superConcept` \u002F `superInterfaces`.\n- **`IS_SUBCONCEPT_OF`** is the fastest way to verify a single assignability question; do not enumerate `GET_SUB_CONCEPTS` and search by hand.\n\n## Module-Level Inheritance (Language Extension)\n\nOne language can inherit the structure and functionality of another via an \"extends\" relationship.\n\n1. **Tool**: `mps_mcp_get_project_structure` (with `includeDependencies: true`).\n2. **Workflow**: check the `extendedLanguages` field in the response for the target language. This lists direct parent languages.\n3. **Hierarchy tracing**: recursively call this tool for each parent to build the full inheritance tree.\n\n## Concept-Level Inheritance\n\n### Upward Hierarchy (Ancestors)\n\n* **Direct ancestors**: use `mps_mcp_get_concept_details`. The response includes:\n    * `superConcept`: immediate parent concept.\n    * `superInterfaces`: immediate implemented interface concepts.\n    * `superConceptContainingProject` and `superInterfaceDetails[*].containingProject` when an ancestor comes from another open MPS project and is read-only from the selected project.\n* **Full closure**: use `mps_mcp_query_structure` with `GET_ALL_SUPERCONCEPTS` to get the complete chain of ancestors and interfaces in one call.\n\n### Downward Hierarchy (Descendants)\n\n* **Specializations**: use `mps_mcp_query_structure` with `GET_SUB_CONCEPTS` to find all concepts (direct and indirect) inheriting from a base.\n* **Implementations**: use `GET_ASSIGNABLE_CONCEPTS` to retrieve only non-abstract subconcepts that can be instantiated.\n\n## Strategic Analysis\n\n* **Verification**: use `mps_mcp_query_structure` with `IS_SUBCONCEPT_OF` to check if concept A inherits from concept B.\n* **Cross-language extension**: compare the `languageReference` of a concept with that of its `superConcept`. Different references indicate a language boundary specialization; foreign-project ancestors are marked explicitly with the containing-project fields.\n* **Discovery**: use `mps_mcp_search_concepts` to find base concepts (e.g. \"Statement\") for extension.\n* **Implicit dependencies**: if a model uses a language without an explicit import, check if its used languages extend the missing language via `mps_mcp_get_project_structure`.\n\n## Best Practice\n\nIdentify extension points by first checking high-level `extendedLanguages` via `mps_mcp_get_project_structure`, then use `mps_mcp_get_concept_details` to pinpoint cross-language concept specializations.\n\n## Related Skills\n\n- **`mps-language-analysis`** — start here when you need general language inspection, not just inheritance.\n- **`mps-aspect-structure-concepts`** — when you intend to define new concepts (with their own super\u002Finterface lists).\n- **`mps-aspect-accessories`** — for `extendedLanguages` vs `usedLanguages` semantics at module level.\n",{"data":33,"body":35},{"name":4,"description":6,"type":34},"reference",{"type":36,"children":37},"root",[38,47,62,69,152,158,163,221,227,234,321,327,369,375,457,463,489,495],{"type":39,"tag":40,"props":41,"children":43},"element","h1",{"id":42},"mps-language-and-concept-inheritance",[44],{"type":45,"value":46},"text","MPS Language and Concept Inheritance",{"type":39,"tag":48,"props":49,"children":50},"p",{},[51,53,60],{"type":45,"value":52},"Two layers of inheritance matter in MPS: module-level (one language ",{"type":39,"tag":54,"props":55,"children":57},"code",{"className":56},[],[58],{"type":45,"value":59},"extends",{"type":45,"value":61}," another) and concept-level (concepts inherit superconcepts and implement interface concepts).",{"type":39,"tag":63,"props":64,"children":66},"h2",{"id":65},"critical-directives",[67],{"type":45,"value":68},"Critical Directives",{"type":39,"tag":70,"props":71,"children":72},"ul",{},[73,101,130],{"type":39,"tag":74,"props":75,"children":76},"li",{},[77,83,85,91,93,99],{"type":39,"tag":78,"props":79,"children":80},"strong",{},[81],{"type":45,"value":82},"Concept-level inheritance is realized through module-level extension",{"type":45,"value":84}," — different ",{"type":39,"tag":54,"props":86,"children":88},{"className":87},[],[89],{"type":45,"value":90},"languageReference",{"type":45,"value":92}," on a concept and its ",{"type":39,"tag":54,"props":94,"children":96},{"className":95},[],[97],{"type":45,"value":98},"superConcept",{"type":45,"value":100}," indicates a cross-language specialization, which usually requires the consumer's language to extend the parent.",{"type":39,"tag":74,"props":102,"children":103},{},[104,113,115,120,122,128],{"type":39,"tag":78,"props":105,"children":106},{},[107],{"type":39,"tag":54,"props":108,"children":110},{"className":109},[],[111],{"type":45,"value":112},"GET_ALL_SUPERCONCEPTS",{"type":45,"value":114}," gives the full transitive closure in a single call — prefer it over recursive walking of ",{"type":39,"tag":54,"props":116,"children":118},{"className":117},[],[119],{"type":45,"value":98},{"type":45,"value":121}," \u002F ",{"type":39,"tag":54,"props":123,"children":125},{"className":124},[],[126],{"type":45,"value":127},"superInterfaces",{"type":45,"value":129},".",{"type":39,"tag":74,"props":131,"children":132},{},[133,142,144,150],{"type":39,"tag":78,"props":134,"children":135},{},[136],{"type":39,"tag":54,"props":137,"children":139},{"className":138},[],[140],{"type":45,"value":141},"IS_SUBCONCEPT_OF",{"type":45,"value":143}," is the fastest way to verify a single assignability question; do not enumerate ",{"type":39,"tag":54,"props":145,"children":147},{"className":146},[],[148],{"type":45,"value":149},"GET_SUB_CONCEPTS",{"type":45,"value":151}," and search by hand.",{"type":39,"tag":63,"props":153,"children":155},{"id":154},"module-level-inheritance-language-extension",[156],{"type":45,"value":157},"Module-Level Inheritance (Language Extension)",{"type":39,"tag":48,"props":159,"children":160},{},[161],{"type":45,"value":162},"One language can inherit the structure and functionality of another via an \"extends\" relationship.",{"type":39,"tag":164,"props":165,"children":166},"ol",{},[167,193,211],{"type":39,"tag":74,"props":168,"children":169},{},[170,175,177,183,185,191],{"type":39,"tag":78,"props":171,"children":172},{},[173],{"type":45,"value":174},"Tool",{"type":45,"value":176},": ",{"type":39,"tag":54,"props":178,"children":180},{"className":179},[],[181],{"type":45,"value":182},"mps_mcp_get_project_structure",{"type":45,"value":184}," (with ",{"type":39,"tag":54,"props":186,"children":188},{"className":187},[],[189],{"type":45,"value":190},"includeDependencies: true",{"type":45,"value":192},").",{"type":39,"tag":74,"props":194,"children":195},{},[196,201,203,209],{"type":39,"tag":78,"props":197,"children":198},{},[199],{"type":45,"value":200},"Workflow",{"type":45,"value":202},": check the ",{"type":39,"tag":54,"props":204,"children":206},{"className":205},[],[207],{"type":45,"value":208},"extendedLanguages",{"type":45,"value":210}," field in the response for the target language. This lists direct parent languages.",{"type":39,"tag":74,"props":212,"children":213},{},[214,219],{"type":39,"tag":78,"props":215,"children":216},{},[217],{"type":45,"value":218},"Hierarchy tracing",{"type":45,"value":220},": recursively call this tool for each parent to build the full inheritance tree.",{"type":39,"tag":63,"props":222,"children":224},{"id":223},"concept-level-inheritance",[225],{"type":45,"value":226},"Concept-Level Inheritance",{"type":39,"tag":228,"props":229,"children":231},"h3",{"id":230},"upward-hierarchy-ancestors",[232],{"type":45,"value":233},"Upward Hierarchy (Ancestors)",{"type":39,"tag":70,"props":235,"children":236},{},[237,297],{"type":39,"tag":74,"props":238,"children":239},{},[240,245,247,253,255],{"type":39,"tag":78,"props":241,"children":242},{},[243],{"type":45,"value":244},"Direct ancestors",{"type":45,"value":246},": use ",{"type":39,"tag":54,"props":248,"children":250},{"className":249},[],[251],{"type":45,"value":252},"mps_mcp_get_concept_details",{"type":45,"value":254},". The response includes:\n",{"type":39,"tag":70,"props":256,"children":257},{},[258,268,278],{"type":39,"tag":74,"props":259,"children":260},{},[261,266],{"type":39,"tag":54,"props":262,"children":264},{"className":263},[],[265],{"type":45,"value":98},{"type":45,"value":267},": immediate parent concept.",{"type":39,"tag":74,"props":269,"children":270},{},[271,276],{"type":39,"tag":54,"props":272,"children":274},{"className":273},[],[275],{"type":45,"value":127},{"type":45,"value":277},": immediate implemented interface concepts.",{"type":39,"tag":74,"props":279,"children":280},{},[281,287,289,295],{"type":39,"tag":54,"props":282,"children":284},{"className":283},[],[285],{"type":45,"value":286},"superConceptContainingProject",{"type":45,"value":288}," and ",{"type":39,"tag":54,"props":290,"children":292},{"className":291},[],[293],{"type":45,"value":294},"superInterfaceDetails[*].containingProject",{"type":45,"value":296}," when an ancestor comes from another open MPS project and is read-only from the selected project.",{"type":39,"tag":74,"props":298,"children":299},{},[300,305,306,312,314,319],{"type":39,"tag":78,"props":301,"children":302},{},[303],{"type":45,"value":304},"Full closure",{"type":45,"value":246},{"type":39,"tag":54,"props":307,"children":309},{"className":308},[],[310],{"type":45,"value":311},"mps_mcp_query_structure",{"type":45,"value":313}," with ",{"type":39,"tag":54,"props":315,"children":317},{"className":316},[],[318],{"type":45,"value":112},{"type":45,"value":320}," to get the complete chain of ancestors and interfaces in one call.",{"type":39,"tag":228,"props":322,"children":324},{"id":323},"downward-hierarchy-descendants",[325],{"type":45,"value":326},"Downward Hierarchy (Descendants)",{"type":39,"tag":70,"props":328,"children":329},{},[330,352],{"type":39,"tag":74,"props":331,"children":332},{},[333,338,339,344,345,350],{"type":39,"tag":78,"props":334,"children":335},{},[336],{"type":45,"value":337},"Specializations",{"type":45,"value":246},{"type":39,"tag":54,"props":340,"children":342},{"className":341},[],[343],{"type":45,"value":311},{"type":45,"value":313},{"type":39,"tag":54,"props":346,"children":348},{"className":347},[],[349],{"type":45,"value":149},{"type":45,"value":351}," to find all concepts (direct and indirect) inheriting from a base.",{"type":39,"tag":74,"props":353,"children":354},{},[355,360,361,367],{"type":39,"tag":78,"props":356,"children":357},{},[358],{"type":45,"value":359},"Implementations",{"type":45,"value":246},{"type":39,"tag":54,"props":362,"children":364},{"className":363},[],[365],{"type":45,"value":366},"GET_ASSIGNABLE_CONCEPTS",{"type":45,"value":368}," to retrieve only non-abstract subconcepts that can be instantiated.",{"type":39,"tag":63,"props":370,"children":372},{"id":371},"strategic-analysis",[373],{"type":45,"value":374},"Strategic Analysis",{"type":39,"tag":70,"props":376,"children":377},{},[378,400,424,441],{"type":39,"tag":74,"props":379,"children":380},{},[381,386,387,392,393,398],{"type":39,"tag":78,"props":382,"children":383},{},[384],{"type":45,"value":385},"Verification",{"type":45,"value":246},{"type":39,"tag":54,"props":388,"children":390},{"className":389},[],[391],{"type":45,"value":311},{"type":45,"value":313},{"type":39,"tag":54,"props":394,"children":396},{"className":395},[],[397],{"type":45,"value":141},{"type":45,"value":399}," to check if concept A inherits from concept B.",{"type":39,"tag":74,"props":401,"children":402},{},[403,408,410,415,417,422],{"type":39,"tag":78,"props":404,"children":405},{},[406],{"type":45,"value":407},"Cross-language extension",{"type":45,"value":409},": compare the ",{"type":39,"tag":54,"props":411,"children":413},{"className":412},[],[414],{"type":45,"value":90},{"type":45,"value":416}," of a concept with that of its ",{"type":39,"tag":54,"props":418,"children":420},{"className":419},[],[421],{"type":45,"value":98},{"type":45,"value":423},". Different references indicate a language boundary specialization; foreign-project ancestors are marked explicitly with the containing-project fields.",{"type":39,"tag":74,"props":425,"children":426},{},[427,432,433,439],{"type":39,"tag":78,"props":428,"children":429},{},[430],{"type":45,"value":431},"Discovery",{"type":45,"value":246},{"type":39,"tag":54,"props":434,"children":436},{"className":435},[],[437],{"type":45,"value":438},"mps_mcp_search_concepts",{"type":45,"value":440}," to find base concepts (e.g. \"Statement\") for extension.",{"type":39,"tag":74,"props":442,"children":443},{},[444,449,451,456],{"type":39,"tag":78,"props":445,"children":446},{},[447],{"type":45,"value":448},"Implicit dependencies",{"type":45,"value":450},": if a model uses a language without an explicit import, check if its used languages extend the missing language via ",{"type":39,"tag":54,"props":452,"children":454},{"className":453},[],[455],{"type":45,"value":182},{"type":45,"value":129},{"type":39,"tag":63,"props":458,"children":460},{"id":459},"best-practice",[461],{"type":45,"value":462},"Best Practice",{"type":39,"tag":48,"props":464,"children":465},{},[466,468,473,475,480,482,487],{"type":45,"value":467},"Identify extension points by first checking high-level ",{"type":39,"tag":54,"props":469,"children":471},{"className":470},[],[472],{"type":45,"value":208},{"type":45,"value":474}," via ",{"type":39,"tag":54,"props":476,"children":478},{"className":477},[],[479],{"type":45,"value":182},{"type":45,"value":481},", then use ",{"type":39,"tag":54,"props":483,"children":485},{"className":484},[],[486],{"type":45,"value":252},{"type":45,"value":488}," to pinpoint cross-language concept specializations.",{"type":39,"tag":63,"props":490,"children":492},{"id":491},"related-skills",[493],{"type":45,"value":494},"Related Skills",{"type":39,"tag":70,"props":496,"children":497},{},[498,512,526],{"type":39,"tag":74,"props":499,"children":500},{},[501,510],{"type":39,"tag":78,"props":502,"children":503},{},[504],{"type":39,"tag":54,"props":505,"children":507},{"className":506},[],[508],{"type":45,"value":509},"mps-language-analysis",{"type":45,"value":511}," — start here when you need general language inspection, not just inheritance.",{"type":39,"tag":74,"props":513,"children":514},{},[515,524],{"type":39,"tag":78,"props":516,"children":517},{},[518],{"type":39,"tag":54,"props":519,"children":521},{"className":520},[],[522],{"type":45,"value":523},"mps-aspect-structure-concepts",{"type":45,"value":525}," — when you intend to define new concepts (with their own super\u002Finterface lists).",{"type":39,"tag":74,"props":527,"children":528},{},[529,538,540,545,547,553],{"type":39,"tag":78,"props":530,"children":531},{},[532],{"type":39,"tag":54,"props":533,"children":535},{"className":534},[],[536],{"type":45,"value":537},"mps-aspect-accessories",{"type":45,"value":539}," — for ",{"type":39,"tag":54,"props":541,"children":543},{"className":542},[],[544],{"type":45,"value":208},{"type":45,"value":546}," vs ",{"type":39,"tag":54,"props":548,"children":550},{"className":549},[],[551],{"type":45,"value":552},"usedLanguages",{"type":45,"value":554}," semantics at module level.",{"items":556,"total":679},[557,570,579,588,597,607,620,629,638,648,657,670],{"slug":537,"name":537,"fn":558,"description":559,"org":560,"tags":561,"stars":19,"repoUrl":20,"updatedAt":569},"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},[562,565,568],{"name":563,"slug":564,"type":15},"Architecture","architecture",{"name":566,"slug":567,"type":15},"Configuration","configuration",{"name":13,"slug":14,"type":15},"2026-07-17T06:06:57.311661",{"slug":571,"name":571,"fn":572,"description":573,"org":574,"tags":575,"stars":19,"repoUrl":20,"updatedAt":578},"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},[576,577],{"name":563,"slug":564,"type":15},{"name":13,"slug":14,"type":15},"2026-07-17T06:04:48.066901",{"slug":580,"name":580,"fn":581,"description":582,"org":583,"tags":584,"stars":19,"repoUrl":20,"updatedAt":587},"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},[585,586],{"name":563,"slug":564,"type":15},{"name":13,"slug":14,"type":15},"2026-07-13T06:45:21.757084",{"slug":589,"name":589,"fn":590,"description":591,"org":592,"tags":593,"stars":19,"repoUrl":20,"updatedAt":596},"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},[594,595],{"name":563,"slug":564,"type":15},{"name":17,"slug":18,"type":15},"2026-07-23T05:41:33.639365",{"slug":598,"name":598,"fn":599,"description":600,"org":601,"tags":602,"stars":19,"repoUrl":20,"updatedAt":606},"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},[603],{"name":604,"slug":605,"type":15},"Data Analysis","data-analysis","2026-07-13T06:45:19.114674",{"slug":608,"name":608,"fn":609,"description":610,"org":611,"tags":612,"stars":19,"repoUrl":20,"updatedAt":619},"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},[613,616],{"name":614,"slug":615,"type":15},"Design","design",{"name":617,"slug":618,"type":15},"UI Components","ui-components","2026-07-23T05:41:56.638151",{"slug":621,"name":621,"fn":622,"description":623,"org":624,"tags":625,"stars":19,"repoUrl":20,"updatedAt":628},"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},[626,627],{"name":13,"slug":14,"type":15},{"name":617,"slug":618,"type":15},"2026-07-23T05:41:49.666535",{"slug":630,"name":630,"fn":631,"description":632,"org":633,"tags":634,"stars":19,"repoUrl":20,"updatedAt":637},"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},[635,636],{"name":563,"slug":564,"type":15},{"name":13,"slug":14,"type":15},"2026-07-13T06:44:59.507855",{"slug":639,"name":639,"fn":640,"description":641,"org":642,"tags":643,"stars":19,"repoUrl":20,"updatedAt":647},"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},[644,645,646],{"name":563,"slug":564,"type":15},{"name":17,"slug":18,"type":15},{"name":13,"slug":14,"type":15},"2026-07-17T06:06:58.042999",{"slug":649,"name":649,"fn":650,"description":651,"org":652,"tags":653,"stars":19,"repoUrl":20,"updatedAt":656},"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},[654,655],{"name":563,"slug":564,"type":15},{"name":13,"slug":14,"type":15},"2026-07-23T05:41:48.692899",{"slug":658,"name":658,"fn":659,"description":660,"org":661,"tags":662,"stars":19,"repoUrl":20,"updatedAt":669},"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},[663,666],{"name":664,"slug":665,"type":15},"Debugging","debugging",{"name":667,"slug":668,"type":15},"Migration","migration","2026-07-13T06:45:20.372122",{"slug":523,"name":523,"fn":671,"description":672,"org":673,"tags":674,"stars":19,"repoUrl":20,"updatedAt":678},"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},[675],{"name":676,"slug":677,"type":15},"Data Modeling","data-modeling","2026-07-23T05:41:30.705975",188,{"items":681,"total":717},[682,688,693,698,703,707,712],{"slug":537,"name":537,"fn":558,"description":559,"org":683,"tags":684,"stars":19,"repoUrl":20,"updatedAt":569},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[685,686,687],{"name":563,"slug":564,"type":15},{"name":566,"slug":567,"type":15},{"name":13,"slug":14,"type":15},{"slug":571,"name":571,"fn":572,"description":573,"org":689,"tags":690,"stars":19,"repoUrl":20,"updatedAt":578},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[691,692],{"name":563,"slug":564,"type":15},{"name":13,"slug":14,"type":15},{"slug":580,"name":580,"fn":581,"description":582,"org":694,"tags":695,"stars":19,"repoUrl":20,"updatedAt":587},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[696,697],{"name":563,"slug":564,"type":15},{"name":13,"slug":14,"type":15},{"slug":589,"name":589,"fn":590,"description":591,"org":699,"tags":700,"stars":19,"repoUrl":20,"updatedAt":596},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[701,702],{"name":563,"slug":564,"type":15},{"name":17,"slug":18,"type":15},{"slug":598,"name":598,"fn":599,"description":600,"org":704,"tags":705,"stars":19,"repoUrl":20,"updatedAt":606},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[706],{"name":604,"slug":605,"type":15},{"slug":608,"name":608,"fn":609,"description":610,"org":708,"tags":709,"stars":19,"repoUrl":20,"updatedAt":619},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[710,711],{"name":614,"slug":615,"type":15},{"name":617,"slug":618,"type":15},{"slug":621,"name":621,"fn":622,"description":623,"org":713,"tags":714,"stars":19,"repoUrl":20,"updatedAt":628},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[715,716],{"name":13,"slug":14,"type":15},{"name":617,"slug":618,"type":15},31]