[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill-jetbrains-mps-language-aspects-overview":3,"mdc-dlm4m4-key":35,"related-repo-jetbrains-mps-language-aspects-overview":1749,"related-org-jetbrains-mps-language-aspects-overview":1818},{"slug":4,"name":4,"fn":5,"description":6,"org":7,"tags":11,"stars":22,"repoUrl":23,"updatedAt":24,"license":25,"forks":26,"topics":27,"repo":30,"sourceUrl":33,"mdContent":34},"mps-language-aspects-overview","author MPS language aspects","Entry point for authoring or modifying an MPS language — index of all aspects (structure, editor, constraints, behavior, typesystem, intentions, actions, generator, textgen, accessories, generation plans), the recommended authoring order, cross-aspect call patterns, dependency\u002Frebuild rules, and validation flow. 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Start here when defining a new language or when you do not know which aspect-specific skill applies.\ntype: reference\n---\n\n# MPS Language Aspects — Overview\n\nAn MPS language is a collection of **aspects**, each a separate model inside the language module. Together they define syntax, semantics, UI, and output. Edit each aspect through its own language (its DSL). This skill is the router; each aspect links to a dedicated skill.\n\n## Critical Directives\n\n- **Always prefer MPS MCP tools over hand-editing `.mps` XML.** Hand edits can silently corrupt model files.\n- **Keep aspect rules thin and declarative** — push logic into **behavior methods**, then call them from any aspect.\n- **When something in a consumer is wrong, re-check the root cause on the language side** (structure \u002F generator \u002F typesystem) before patching generated Java.\n- **Choose a modularity strategy before authoring** when this language must relate to others — reference, extend, embed, or adapt them. The kind you pick (referencing \u002F extension \u002F reuse \u002F embedding) changes how you use structure, constraints, typesystem, and generator. See [`mps-language-modularity`](..\u002Fmps-language-modularity\u002FSKILL.md).\n\n## Aspects and Where to Find Detailed Guidance\n\n| Aspect | Aspect ID \u002F Stereotype | Model file | Language DSL | Detailed skill |\n|---|---|---|---|---|\n| **Structure** | `structure` | `models\u002Fstructure.mps` | `jetbrains.mps.lang.structure` | [`mps-aspect-structure-concepts`](..\u002Fmps-aspect-structure-concepts\u002FSKILL.md) |\n| **Editor** | `editor` | `models\u002Feditor.mps` | `jetbrains.mps.lang.editor` | [`mps-aspect-editor`](..\u002Fmps-aspect-editor\u002FSKILL.md), [`mps-aspect-editor-menus-and-keymaps`](..\u002Fmps-aspect-editor-menus-and-keymaps\u002FSKILL.md) |\n| **Constraints** | `constraints` | `models\u002Fconstraints.mps` | `jetbrains.mps.lang.constraints` | [`mps-aspect-constraints`](..\u002Fmps-aspect-constraints\u002FSKILL.md) |\n| **Behavior** | `behavior` | `models\u002Fbehavior.mps` | `jetbrains.mps.lang.behavior` | [`mps-aspect-behavior`](..\u002Fmps-aspect-behavior\u002FSKILL.md) |\n| **Typesystem & Checking** | `typesystem` | `models\u002Ftypesystem.mps` | `jetbrains.mps.lang.typesystem` | [`mps-aspect-typesystem`](..\u002Fmps-aspect-typesystem\u002FSKILL.md) |\n| **Intentions** | `intentions` | `models\u002Fintentions.mps` | `jetbrains.mps.lang.intentions` | [`mps-aspect-intentions`](..\u002Fmps-aspect-intentions\u002FSKILL.md) |\n| **Actions** | `actions` | `models\u002Factions.mps` | `jetbrains.mps.lang.actions` | [`mps-aspect-actions`](..\u002Fmps-aspect-actions\u002FSKILL.md) |\n| **Generator** | `@generator` (stereotype) | `generator\u002Ftemplate\u002Fmain@generator.mps` | `jetbrains.mps.lang.generator` | [`mps-aspect-generator`](..\u002Fmps-aspect-generator\u002FSKILL.md) |\n| **TextGen** | `textGen` | `models\u002FtextGen.mps` | `jetbrains.mps.lang.textGen` | [`mps-aspect-textgen`](..\u002Fmps-aspect-textgen\u002FSKILL.md) |\n| **Dataflow** | `dataFlow` (camelCase) | `models\u002FdataFlow.mps` | `jetbrains.mps.lang.dataFlow` | [`mps-aspect-dataflow`](..\u002Fmps-aspect-dataflow\u002FSKILL.md) |\n| **Migrations** | `migration` | `models\u002Fmigration.mps` | `jetbrains.mps.lang.migration` | [`mps-aspect-migrations`](..\u002Fmps-aspect-migrations\u002FSKILL.md) |\n| **Enhancement scripts** | `scripts` | `models\u002Fscripts.mps` | `jetbrains.mps.lang.script` | [`mps-aspect-migrations`](..\u002Fmps-aspect-migrations\u002FSKILL.md) |\n| **Find Usages** | `findUsages` (camelCase) | `models\u002FfindUsages.mps` | `jetbrains.mps.lang.findUsages` | — |\n| **Refactorings** | `refactorings` | `models\u002Frefactorings.mps` | `jetbrains.mps.lang.refactoring` | — |\n| **IDE plugin** | `plugin` | `models\u002Fplugin.mps` | `jetbrains.mps.lang.plugin` | [`mps-ide-plugin`](..\u002Fmps-ide-plugin\u002FSKILL.md) |\n| **Feedback** | `feedback` | `models\u002Ffeedback.mps` | `jetbrains.mps.lang.feedback` | — |\n| **Accessories \u002F Dependencies** | — (no model created) | `.mpl` and per-model | — | [`mps-aspect-accessories`](..\u002Fmps-aspect-accessories\u002FSKILL.md) |\n| **Code inside bodies** | — | any aspect that holds BL | `baseLanguage`, `smodel`, `collections`, `closures` | [`mps-model-manipulation`](..\u002Fmps-model-manipulation\u002FSKILL.md) |\n| **Inline node literals** | — | any aspect using quotations | `jetbrains.mps.lang.quotation` | [`mps-quotations`](..\u002Fmps-quotations\u002FSKILL.md) |\n\nAspect IDs are **case-sensitive** and create models named `\u003ClangModule>.\u003CaspectId>` with **no `@` suffix**. Stereotypes (`@generator`, `@genplan`, `@tests`, `@descriptor`) are a separate mechanism for non-aspect models. Authoritative table with usage notes and pitfalls: [aspect-model-stereotypes.md](..\u002Fmps-mcp-workflow\u002Freferences\u002Faspect-model-stereotypes.md).\n\nAdditional aspects exist (Find Usages, Refactorings, Scopes Provider, Plugin). They follow the same \"per-concept rule root + body\" pattern — consult companion skills in `.agents\u002Fskills\u002F` or the MPS user guide when needed.\n\n**Generation Plans** (cross-cutting, not an aspect of a single language) are covered by [`mps-aspect-generation-plan`](..\u002Fmps-aspect-generation-plan\u002FSKILL.md). Use when you need to control generator ordering, enable cross-model reference resolution with checkpoints, fork generation into parallel branches, or conditionally contribute plans via `PlanContribution`.\n\n## Typical Authoring Order\n\n1. **Structure** — concepts, properties, children, references, inheritance.\n2. **Editor** — notation, cell layouts, projections; iterate alongside sample models.\n3. **Constraints** — property validators, reference scopes, placement rules.\n4. **Behavior** — concept methods\u002Fconstructors; callable from any aspect.\n5. **Typesystem & checking** — types, subtyping, semantic errors with quick fixes.\n6. **Intentions** — alt-enter refactorings and shortcuts.\n7. **Generator** — transform to a target language (often BaseLanguage).\n8. **TextGen** — only if the target is plain text the language itself emits.\n9. **Accessories \u002F runtime \u002F dependencies** — wire into the `.mpl`, ensure consumers can find everything.\n\nMost iteration is circular: structure ↔ editor ↔ constraints ↔ typesystem.\n\n## Cross-Aspect Calls\n\n- Any aspect body can call **behavior methods** on nodes (`node.m(...)`).\n- Typesystem rules call **quick-fix intentions** via `error ... fix { ... }` or by referencing `QuickFix` roots.\n- Generator templates call **behavior methods** for nontrivial logic and use **mapping labels** for cross-template references.\n- Constraints may call **behavior methods** for reusable checks.\n- Editors may call **behavior methods** in query\u002Fif\u002Fcell-model blocks.\n\nKeep logic in behavior methods; keep aspect rules thin and declarative.\n\n## MCP Tools You'll Use Often\n\n- **Exploration**: `mps_mcp_get_project_structure`, `mps_mcp_search_concepts`, `mps_mcp_get_concept_details`, `mps_mcp_print_node`.\n- **Authoring**: `mps_mcp_create_root_node`, `mps_mcp_insert_root_node_from_json`, `mps_mcp_update_node`, `mps_mcp_parse_java_and_insert`.\n- **Structure-specific**: `mps_mcp_alter_structure` (CREATE_CONCEPTS, CREATE_ENUM, UPDATE_CONCEPT_*), `mps_mcp_query_structure` (inheritance\u002Faspect queries); example nodes of a concept via `mps_mcp_query_nodes` (FIND_INSTANCES).\n- **Modules\u002Fmodels**: `mps_mcp_create_module`, `mps_mcp_create_model`, `mps_mcp_model_dependency`, `mps_mcp_model_used_language`, `mps_mcp_module_dependency`.\n- **Validation**: `mps_mcp_check_root_node_problems`, language\u002Fmodule build via IDE MCP.\n\n## Dependencies and Rebuilds\n\nAfter adding\u002Fchanging:\n- **Concepts (structure)** — downstream aspects' references by concept may break; validate them. Rebuild language.\n- **Behavior method signatures** — all callers (generator, typesystem, constraints, intentions, editor queries) must be re-validated. Rebuild language.\n- **Generator templates** — rebuild generator module (it's separate from the language module).\n- **Runtime solutions** — rebuild the runtime solution; consumers pick up changes on next regeneration or reload.\n- After large changes: `mps_mcp_reload_all` to refresh MPS's runtime concept registry.\n\n## Validation Flow\n\n1. `mps_mcp_check_root_node_problems` on edited roots \u002F aspect models — catches concept-level problems.\n2. Build the language module (IDE MCP) — catches compile errors in generated descriptors.\n3. Regenerate a sample model — catches generator\u002Ftextgen issues.\n4. 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Rebuild language.",{"type":42,"tag":75,"props":1678,"children":1679},{},[1680,1685],{"type":42,"tag":56,"props":1681,"children":1682},{},[1683],{"type":47,"value":1684},"Generator templates",{"type":47,"value":1686}," — rebuild generator module (it's separate from the language module).",{"type":42,"tag":75,"props":1688,"children":1689},{},[1690,1695],{"type":42,"tag":56,"props":1691,"children":1692},{},[1693],{"type":47,"value":1694},"Runtime solutions",{"type":47,"value":1696}," — rebuild the runtime solution; consumers pick up changes on next regeneration or reload.",{"type":42,"tag":75,"props":1698,"children":1699},{},[1700,1702,1708],{"type":47,"value":1701},"After large changes: ",{"type":42,"tag":84,"props":1703,"children":1705},{"className":1704},[],[1706],{"type":47,"value":1707},"mps_mcp_reload_all",{"type":47,"value":1709}," to refresh MPS's runtime concept registry.",{"type":42,"tag":64,"props":1711,"children":1713},{"id":1712},"validation-flow",[1714],{"type":47,"value":1715},"Validation Flow",{"type":42,"tag":1266,"props":1717,"children":1718},{},[1719,1729,1734,1739],{"type":42,"tag":75,"props":1720,"children":1721},{},[1722,1727],{"type":42,"tag":84,"props":1723,"children":1725},{"className":1724},[],[1726],{"type":47,"value":1640},{"type":47,"value":1728}," on edited roots \u002F aspect models — catches concept-level problems.",{"type":42,"tag":75,"props":1730,"children":1731},{},[1732],{"type":47,"value":1733},"Build the language module (IDE MCP) — catches compile errors in generated descriptors.",{"type":42,"tag":75,"props":1735,"children":1736},{},[1737],{"type":47,"value":1738},"Regenerate a sample model — catches generator\u002Ftextgen issues.",{"type":42,"tag":75,"props":1740,"children":1741},{},[1742],{"type":47,"value":1743},"Inspect sample in MPS UI — catches editor \u002F usability issues.",{"type":42,"tag":50,"props":1745,"children":1746},{},[1747],{"type":47,"value":1748},"When something in a consumer is wrong, always re-check the root cause on the language side (structure \u002F generator \u002F typesystem) before patching generated Java.",{"items":1750,"total":1817},[1751,1762,1770,1778,1788,1797,1809],{"slug":1041,"name":1041,"fn":1752,"description":1753,"org":1754,"tags":1755,"stars":22,"repoUrl":23,"updatedAt":1761},"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},[1756,1757,1760],{"name":13,"slug":14,"type":15},{"name":1758,"slug":1759,"type":15},"Configuration","configuration",{"name":20,"slug":21,"type":15},"2026-07-17T06:06:57.311661",{"slug":561,"name":561,"fn":1763,"description":1764,"org":1765,"tags":1766,"stars":22,"repoUrl":23,"updatedAt":1769},"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},[1767,1768],{"name":13,"slug":14,"type":15},{"name":20,"slug":21,"type":15},"2026-07-17T06:04:48.066901",{"slug":408,"name":408,"fn":1771,"description":1772,"org":1773,"tags":1774,"stars":22,"repoUrl":23,"updatedAt":1777},"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},[1775,1776],{"name":13,"slug":14,"type":15},{"name":20,"slug":21,"type":15},"2026-07-13T06:45:21.757084",{"slug":357,"name":357,"fn":1779,"description":1780,"org":1781,"tags":1782,"stars":22,"repoUrl":23,"updatedAt":1787},"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},[1783,1784],{"name":13,"slug":14,"type":15},{"name":1785,"slug":1786,"type":15},"Code Analysis","code-analysis","2026-07-23T05:41:33.639365",{"slug":718,"name":718,"fn":1789,"description":1790,"org":1791,"tags":1792,"stars":22,"repoUrl":23,"updatedAt":1796},"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},[1793],{"name":1794,"slug":1795,"type":15},"Data Analysis","data-analysis","2026-07-13T06:45:19.114674",{"slug":294,"name":294,"fn":1798,"description":1799,"org":1800,"tags":1801,"stars":22,"repoUrl":23,"updatedAt":1808},"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},[1802,1805],{"name":1803,"slug":1804,"type":15},"Design","design",{"name":1806,"slug":1807,"type":15},"UI Components","ui-components","2026-07-23T05:41:56.638151",{"slug":306,"name":306,"fn":1810,"description":1811,"org":1812,"tags":1813,"stars":22,"repoUrl":23,"updatedAt":1816},"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},[1814,1815],{"name":20,"slug":21,"type":15},{"name":1806,"slug":1807,"type":15},"2026-07-23T05:41:49.666535",31,{"items":1819,"total":1898},[1820,1826,1831,1836,1841,1845,1850,1855,1863,1872,1880,1891],{"slug":1041,"name":1041,"fn":1752,"description":1753,"org":1821,"tags":1822,"stars":22,"repoUrl":23,"updatedAt":1761},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1823,1824,1825],{"name":13,"slug":14,"type":15},{"name":1758,"slug":1759,"type":15},{"name":20,"slug":21,"type":15},{"slug":561,"name":561,"fn":1763,"description":1764,"org":1827,"tags":1828,"stars":22,"repoUrl":23,"updatedAt":1769},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1829,1830],{"name":13,"slug":14,"type":15},{"name":20,"slug":21,"type":15},{"slug":408,"name":408,"fn":1771,"description":1772,"org":1832,"tags":1833,"stars":22,"repoUrl":23,"updatedAt":1777},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1834,1835],{"name":13,"slug":14,"type":15},{"name":20,"slug":21,"type":15},{"slug":357,"name":357,"fn":1779,"description":1780,"org":1837,"tags":1838,"stars":22,"repoUrl":23,"updatedAt":1787},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1839,1840],{"name":13,"slug":14,"type":15},{"name":1785,"slug":1786,"type":15},{"slug":718,"name":718,"fn":1789,"description":1790,"org":1842,"tags":1843,"stars":22,"repoUrl":23,"updatedAt":1796},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1844],{"name":1794,"slug":1795,"type":15},{"slug":294,"name":294,"fn":1798,"description":1799,"org":1846,"tags":1847,"stars":22,"repoUrl":23,"updatedAt":1808},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1848,1849],{"name":1803,"slug":1804,"type":15},{"name":1806,"slug":1807,"type":15},{"slug":306,"name":306,"fn":1810,"description":1811,"org":1851,"tags":1852,"stars":22,"repoUrl":23,"updatedAt":1816},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1853,1854],{"name":20,"slug":21,"type":15},{"name":1806,"slug":1807,"type":15},{"slug":1249,"name":1249,"fn":1856,"description":1857,"org":1858,"tags":1859,"stars":22,"repoUrl":23,"updatedAt":1862},"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},[1860,1861],{"name":13,"slug":14,"type":15},{"name":20,"slug":21,"type":15},"2026-07-13T06:44:59.507855",{"slug":614,"name":614,"fn":1864,"description":1865,"org":1866,"tags":1867,"stars":22,"repoUrl":23,"updatedAt":1871},"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},[1868,1869,1870],{"name":13,"slug":14,"type":15},{"name":1785,"slug":1786,"type":15},{"name":20,"slug":21,"type":15},"2026-07-17T06:06:58.042999",{"slug":510,"name":510,"fn":1873,"description":1874,"org":1875,"tags":1876,"stars":22,"repoUrl":23,"updatedAt":1879},"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},[1877,1878],{"name":13,"slug":14,"type":15},{"name":20,"slug":21,"type":15},"2026-07-23T05:41:48.692899",{"slug":769,"name":769,"fn":1881,"description":1882,"org":1883,"tags":1884,"stars":22,"repoUrl":23,"updatedAt":1890},"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},[1885,1888],{"name":1886,"slug":1887,"type":15},"Debugging","debugging",{"name":1889,"slug":738,"type":15},"Migration","2026-07-13T06:45:20.372122",{"slug":243,"name":243,"fn":1892,"description":1893,"org":1894,"tags":1895,"stars":22,"repoUrl":23,"updatedAt":1897},"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},[1896],{"name":17,"slug":18,"type":15},"2026-07-23T05:41:30.705975",188]