[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill-jetbrains-mps-build-language":3,"mdc--riprsi-key":32,"related-org-jetbrains-mps-build-language":2099,"related-repo-jetbrains-mps-build-language":2229},{"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-build-language","author MPS Build Language scripts","Use when authoring or modifying MPS Build Language scripts (`BuildProject` roots) — the declarative DSL that generates Ant `build.xml` to package MPS language plugins, IDEA plugins, plain Java modules, standalone IDE\u002FRCP distributions, module tests, or `run code from solution` tasks. Covers build solution setup, macros, project\u002Fexternal\u002FJava dependencies, MPS module declarations (`BuildMps_Language` \u002F `_Solution` \u002F `_Generator`), groups, layouts, IDEA-plugin declarations, MPS settings, and the workflow language. Trigger terms: `BuildProject`, `BuildMps_*`, `BuildLayout_*`, `jetbrains.mps.build`, `build.mps` solution, `internalBaseDirectory`, `compactBuildScriptFileName`, Ant target generation, `mps_home`, `idea_home`.",{"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},"Java","java","tag",{"name":17,"slug":18,"type":15},"Build","build",1650,"https:\u002F\u002Fgithub.com\u002FJetBrains\u002FMPS","2026-07-17T06:04:43.544118",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-build-language","---\nname: mps-build-language\ndescription: >-\n  Use when authoring or modifying MPS Build Language scripts (`BuildProject` roots) — the declarative DSL that generates Ant `build.xml` to package MPS language plugins, IDEA plugins, plain Java modules, standalone IDE\u002FRCP distributions, module tests, or `run code from solution` tasks. Covers build solution setup, macros, project\u002Fexternal\u002FJava dependencies, MPS module declarations (`BuildMps_Language` \u002F `_Solution` \u002F `_Generator`), groups, layouts, IDEA-plugin declarations, MPS settings, and the workflow language. Trigger terms: `BuildProject`, `BuildMps_*`, `BuildLayout_*`, `jetbrains.mps.build`, `build.mps` solution, `internalBaseDirectory`, `compactBuildScriptFileName`, Ant target generation, `mps_home`, `idea_home`.\ntype: reference\n---\n\n# MPS Build Language\n\nThe **MPS Build Language** is a declarative DSL (a stack of MPS languages on top of Ant) that generates an Apache Ant `build.xml` file. It is used to package MPS-language plugins, build standalone IDE\u002FRCP distributions, package plain Java modules, and run MPS tests or generation-diff tests. Build scripts are root nodes of concept `BuildProject` inside a regular **solution** module; pressing Make on that solution runs a generator that writes `build.xml` to disk.\n\n## Critical Directives\n\n- The generator writes `build.xml` — it does **not** invoke Ant. To produce artifacts you must run `ant` separately (from MPS right-click → Run, or from the command line in the generated folder).\n- Build scripts are MPS nodes. Edit them via projectional editing or `mps_mcp_*` JSON tools. **Never hand-edit the `.mps` file** as if it were Ant XML.\n- Declaring a module in `BuildProject.parts` **does not** cause it to be built. Only items **referenced from the `layout`** end up in the output. `parts` is declaration; `layout` is packaging.\n- Build scripts **compile** languages but do **not regenerate** them. Generate languages to Java first (or enable the `mps` build plugin's full-make task) before running Ant.\n- Always import `jetbrains.mps.ide.build` (`422c2909-59d6-41a9-b318-40e6256b250f`) on the build solution — it is the catalog of well-known externals (`IDEA`, `mps`, `mpsStandalone`, JDK, MPS modules).\n- After every change to a module's `.mpl` \u002F `.msd`, re-run the **Load required information from file** intention on the matching `BuildMps_*` node. Build-script module dependencies must match the actual `.mpl` declarations or the chunk generator throws \"class not found\".\n- A `BuildMps_Group` must contain the **transitive closure** of language dependencies. Missing members appear as red squiggles at generation time.\n- Always set `internalBaseDirectory` — every relative path is resolved against it.\n\n## Common-Path Workflow\n\nFor a typical \"package an MPS language as an installable plugin\" task:\n\n1. **Create the build solution.** A regular solution (not language) named `\u003Cproject>.build`. In its `.msd`, add a dependency on `jetbrains.mps.ide.build` and declare languages `jetbrains.mps.build` and `jetbrains.mps.build.mps`. Set Java facet `compile=\"mps\" classes=\"mps\"`. See `references\u002Fsolution-setup.md`.\n2. **Create the model** (conventionally `\u003Cproject>.build`) with the same languages as used languages.\n3. **Insert the `BuildProject` root** with `name`, `internalBaseDirectory`, `compactBuildScriptFileName`. Use `mps_mcp_insert_root_node_from_json` with the skeleton in `references\u002Fbuildproject-skeleton.md`.\n4. **Add plugins to `BuildProject.plugins`:** at minimum `BuildJavaPlugin` and `BuildMPSPlugin`. Add `BuildModuleTestsPlugin` \u002F `BuildSolutionRunnerPlugin` only when needed (see `references\u002Fplugins-and-macros.md`).\n5. **Declare macros** (`mps_home`, optionally `idea_home`, plus version\u002Ftimestamp Var macros) — see `references\u002Fplugins-and-macros.md`.\n6. **Add external dependencies** to `BuildProject.dependencies` for `mps` (or `mpsStandalone`) and `IDEA`, wired to macro paths — see `references\u002Fdependencies.md`.\n7. **Add parts:** one `BuildSource_JavaOptions`, then a `BuildMps_Language` \u002F `_Solution` \u002F `_Generator` per MPS module (call **Load required information from file** on each), wrapped in `BuildMps_Group`s. Add a `BuildMps_IdeaPlugin` whose `content` references the groups. See `references\u002Fmps-modules.md` and `references\u002Fidea-plugins.md`.\n8. **Define the layout:** one `BuildLayout` root, typically wrapping a `BuildLayout_Zip` named `\u003Cplugin>.zip`, with one `BuildMpsLayout_Plugin` (`AutoPluginLayoutType`) per plugin. See `references\u002Flayouts.md`.\n9. **Make the build solution** (Ctrl-F9 on the model) — this writes `build.xml` at `internalBaseDirectory\u002FcompactBuildScriptFileName`.\n10. **Run Ant** from MPS (right-click `BuildProject` → Run) or `ant -Dmps_home=\u002Fpath\u002Fto\u002FMPS …` from the generated folder. Artifacts land in `.\u002Fbuild\u002Fartifacts`.\n\nFor other task families: standalone IDE distributions → `references\u002Fstandalone-ide.md`; plain Java packaging → `references\u002Fjava-parts.md`; tests → `references\u002Ftests-and-workflow.md`.\n\n## Disambiguation — Don't Conflate These\n\nFour \"dependency\" concepts and two \"aspect\" concepts are routinely confused. See `references\u002Fdisambiguation.md` for the full table before designing dependencies or parts. Quick rule:\n\n- Solution `.msd` deps = what the build solution itself needs at edit time (just `jetbrains.mps.ide.build`).\n- `BuildProject.dependencies` = references to other build scripts or external layouts (`mps`, `IDEA`).\n- `BuildSource_JavaModule.content` deps = classpath of a plain Java module.\n- `BuildMps_*.dependencies` = mirror of the actual `.mpl` \u002F `.msd`, auto-filled by **Load required information from file**.\n\n## Related Skills\n\n- `mps-distribution-build` — the generated Ant pipeline (`build\u002Fmps*.xml`) that builds MPS distributions; complements this skill for bundling plain Java\u002FKotlin plugins into MPS.\n- `mps-ide-plugin` — authoring the contents of an MPS\u002FIDEA plugin (actions, tool windows, keymaps). The build language packages the result.\n- `mps-aspect-accessories` — module dependencies, used languages, runtime solutions, accessory models. The build script's `BuildMps_*` deps must match these.\n- `mps-lang-core-xml` — needed when embedding raw XML for `plugin.xml` enrichment, custom plugin.xml, or `BwfAntStatement` raw Ant commands.\n- `mps-tests` — `NodeTestCase` \u002F `EditorTestCase` test models that `BuildAspect_MpsTestModules` runs.\n- `mps-mcp-workflow`, `mps-node-editing` — node creation and validation conventions used by every `mps_mcp_*` example here.\n\n## Reference Index\n\n- Open `references\u002Fsolution-setup.md` when **creating the build solution and model** — `.msd` content, Java facet settings, used languages, naming conventions, where to find existing build scripts in this repo.\n- Open `references\u002Fbuildproject-skeleton.md` when **inserting or modifying the `BuildProject` root** — JSON skeleton, top-level properties (`name`, `internalBaseDirectory`, `compactBuildScriptFileName`), the role → XML-id table for `plugins` \u002F `macros` \u002F `dependencies` \u002F `parts` \u002F `layout`.\n- Open `references\u002Fplugins-and-macros.md` when **adding build-language plugins or macros** — `BuildJavaPlugin` \u002F `BuildMPSPlugin` \u002F `BuildModuleTestsPlugin` \u002F `BuildSolutionRunnerPlugin`, `BuildFolderMacro`, `BuildVariableMacro` initializers (`InitWithString`, `InitWithDate`, `InitWithPropertyFile`, `InitWithFileContent`), `BuildString` composition.\n- Open `references\u002Fdependencies.md` when **wiring inter-script dependencies** — `BuildExternalLayoutDependency` (external prebuilt artifacts like `IDEA`, `mps`) vs `BuildProjectDependency` (sibling build scripts), how to point at named layouts in `jetbrains.mps.ide.build`, when to omit artifact paths.\n- Open `references\u002Fmps-modules.md` when **declaring `BuildMps_Language` \u002F `BuildMps_Solution` \u002F `BuildMps_Generator`** — minimal JSON, child roles (`path`, `sources`, `dependencies`, `runtime`, `generator`), dependency wiring via `BuildMps_ExtractedModuleDependency`, the `compact=true` convention, **Load required information from file** intention, common target modules in `jetbrains.mps.ide.build`.\n- Open `references\u002Fgroups.md` when **grouping modules via `BuildMps_Group`** — group semantics, transitive-closure rule, when to nest modules inside a group vs leave them at `parts` level.\n- Open `references\u002Fidea-plugins.md` when **declaring or packaging an IDEA plugin** — `BuildMps_IdeaPlugin` part vs `BuildMpsLayout_Plugin` layout entry, fields (`id`, `name`, `version`, `containerName`, `content`, `dependencies`), the three `plugin.xml` strategies (synthesize \u002F enrich \u002F custom), `AutoPluginLayoutType` vs `ManualPluginLayoutType`.\n- Open `references\u002Flayouts.md` when **shaping the output tree** — every layout concept (`BuildLayout_Folder` \u002F `_Zip` \u002F `_Jar` \u002F `_File` \u002F `_Fileset` \u002F `_ImportContent` \u002F `_CopyOfContainer`, `BuildMpsLayout_ModuleJar`, `BuildMpsLayout_Plugin`, `BuildLayout_IdeaPlugin`), the `containerName` pattern, typical MPS-plugin layout, plain-Java packaging example.\n- Open `references\u002Fjava-parts.md` when **building plain Java modules or libraries** — `BuildSource_JavaOptions` properties (compiler, javaLevel, heap, resource selectors), `BuildSource_JavaModule` with content roots and dependencies, `BuildSource_JavaLibrary` grouping, `BuildSource_JavaDependencyJar` \u002F `_OnModule` \u002F `_OnLibrary`.\n- Open `references\u002Fmps-settings.md` when **configuring `BuildMpsAspect`** — `bootstrap` flag, `testGeneration` (the `gentest` Ant target plus Test.Generating \u002F Test.Diffing), `generationMaxHeapSizeInMB`.\n- Open `references\u002Ftests-and-workflow.md` when **adding module tests or custom Ant statements** — `BuildAspect_MpsTestModules`, `BuildMps_TestModuleGroup`, `BuildMps_TestModule`, `BuildMps_RunCodeFromSolution`, the `jetbrains.mps.build.workflow` language (`BwfTask`, `BwfSubTask`, `BwfAntStatement`, `BwfTaskPart`).\n- Open `references\u002Fstandalone-ide.md` when **producing a standalone IDE \u002F RCP distribution** — `mpsStandalone`, branding, startup script, two-stage build, JBR lookup order on Windows\u002FLinux\u002FmacOS, trust-dialog suppression, Tips and Tricks integration.\n- Open `references\u002Fdisambiguation.md` when **confused about \"dependency\" or \"aspect\" terms** — the four \"dependency\" meanings, \"language aspect\" vs \"additional aspects \u002F parts\" vs `BuildMps_IdeaPlugin` vs `BuildMpsLayout_Plugin`, \"project structure\" UI tree vs the docs' \"project structure section\".\n- Open `references\u002Fant-targets.md` when **debugging or extending the generated Ant build** — every target the generator emits (`compileJava`, `processResources`, `classes`, `test`, `check`, `generate`, `cleanSources`, `declare-mps-tasks`, `makeDependents`, `gentest`), generation chunks, why dependency mismatches cause \"class not found\".\n- Open `references\u002Fconcept-catalog.md` when **looking up concept FQNs and XML ids** — full table of concepts under `jetbrains.mps.build`, `jetbrains.mps.build.mps`, `jetbrains.mps.build.mps.tests`, `jetbrains.mps.build.mps.runner`, `jetbrains.mps.build.workflow`, with role → XML-id pairs for raw `.mps` reading.\n- Open `references\u002Fcommon-failures.md` when **a build script misbehaves** — generator complains about missing dependencies; module compiles but is missing from output; \"class not found\" mid-generation; group missing transitive members; `com.intellij.modules.mps` dependency missing; `compiler=\"Eclipse\"` on Java 21+; hand-edited `build.xml` reverted.\n",{"data":33,"body":35},{"name":4,"description":6,"type":34},"reference",{"type":36,"children":37},"root",[38,46,90,97,351,357,362,827,855,861,874,957,963,1100,1106],{"type":39,"tag":40,"props":41,"children":42},"element","h1",{"id":4},[43],{"type":44,"value":45},"text","MPS Build Language",{"type":39,"tag":47,"props":48,"children":49},"p",{},[50,52,57,59,66,68,74,76,81,83,88],{"type":44,"value":51},"The 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Only items ",{"type":39,"tag":53,"props":178,"children":179},{},[180,182],{"type":44,"value":181},"referenced from the ",{"type":39,"tag":60,"props":183,"children":185},{"className":184},[],[186],{"type":44,"value":187},"layout",{"type":44,"value":189}," end up in the output. ",{"type":39,"tag":60,"props":191,"children":193},{"className":192},[],[194],{"type":44,"value":195},"parts",{"type":44,"value":197}," is declaration; ",{"type":39,"tag":60,"props":199,"children":201},{"className":200},[],[202],{"type":44,"value":187},{"type":44,"value":204}," is packaging.",{"type":39,"tag":102,"props":206,"children":207},{},[208,210,215,217,222,224,230],{"type":44,"value":209},"Build scripts ",{"type":39,"tag":53,"props":211,"children":212},{},[213],{"type":44,"value":214},"compile",{"type":44,"value":216}," languages but do ",{"type":39,"tag":53,"props":218,"children":219},{},[220],{"type":44,"value":221},"not regenerate",{"type":44,"value":223}," them. 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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},[2106,2109,2112],{"name":2107,"slug":2108,"type":15},"Architecture","architecture",{"name":2110,"slug":2111,"type":15},"Configuration","configuration",{"name":2113,"slug":2114,"type":15},"Engineering","engineering","2026-07-17T06:06:57.311661",{"slug":2117,"name":2117,"fn":2118,"description":2119,"org":2120,"tags":2121,"stars":19,"repoUrl":20,"updatedAt":2124},"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},[2122,2123],{"name":2107,"slug":2108,"type":15},{"name":2113,"slug":2114,"type":15},"2026-07-17T06:04:48.066901",{"slug":2126,"name":2126,"fn":2127,"description":2128,"org":2129,"tags":2130,"stars":19,"repoUrl":20,"updatedAt":2133},"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},[2131,2132],{"name":2107,"slug":2108,"type":15},{"name":2113,"slug":2114,"type":15},"2026-07-13T06:45:21.757084",{"slug":2135,"name":2135,"fn":2136,"description":2137,"org":2138,"tags":2139,"stars":19,"repoUrl":20,"updatedAt":2144},"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},[2140,2141],{"name":2107,"slug":2108,"type":15},{"name":2142,"slug":2143,"type":15},"Code Analysis","code-analysis","2026-07-23T05:41:33.639365",{"slug":2146,"name":2146,"fn":2147,"description":2148,"org":2149,"tags":2150,"stars":19,"repoUrl":20,"updatedAt":2154},"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},[2151],{"name":2152,"slug":2153,"type":15},"Data Analysis","data-analysis","2026-07-13T06:45:19.114674",{"slug":2156,"name":2156,"fn":2157,"description":2158,"org":2159,"tags":2160,"stars":19,"repoUrl":20,"updatedAt":2167},"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},[2161,2164],{"name":2162,"slug":2163,"type":15},"Design","design",{"name":2165,"slug":2166,"type":15},"UI Components","ui-components","2026-07-23T05:41:56.638151",{"slug":2169,"name":2169,"fn":2170,"description":2171,"org":2172,"tags":2173,"stars":19,"repoUrl":20,"updatedAt":2176},"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},[2174,2175],{"name":2113,"slug":2114,"type":15},{"name":2165,"slug":2166,"type":15},"2026-07-23T05:41:49.666535",{"slug":2178,"name":2178,"fn":2179,"description":2180,"org":2181,"tags":2182,"stars":19,"repoUrl":20,"updatedAt":2185},"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},[2183,2184],{"name":2107,"slug":2108,"type":15},{"name":2113,"slug":2114,"type":15},"2026-07-13T06:44:59.507855",{"slug":2187,"name":2187,"fn":2188,"description":2189,"org":2190,"tags":2191,"stars":19,"repoUrl":20,"updatedAt":2195},"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},[2192,2193,2194],{"name":2107,"slug":2108,"type":15},{"name":2142,"slug":2143,"type":15},{"name":2113,"slug":2114,"type":15},"2026-07-17T06:06:58.042999",{"slug":2197,"name":2197,"fn":2198,"description":2199,"org":2200,"tags":2201,"stars":19,"repoUrl":20,"updatedAt":2204},"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},[2202,2203],{"name":2107,"slug":2108,"type":15},{"name":2113,"slug":2114,"type":15},"2026-07-23T05:41:48.692899",{"slug":2206,"name":2206,"fn":2207,"description":2208,"org":2209,"tags":2210,"stars":19,"repoUrl":20,"updatedAt":2217},"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},[2211,2214],{"name":2212,"slug":2213,"type":15},"Debugging","debugging",{"name":2215,"slug":2216,"type":15},"Migration","migration","2026-07-13T06:45:20.372122",{"slug":2219,"name":2219,"fn":2220,"description":2221,"org":2222,"tags":2223,"stars":19,"repoUrl":20,"updatedAt":2227},"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},[2224],{"name":2225,"slug":2226,"type":15},"Data Modeling","data-modeling","2026-07-23T05:41:30.705975",188,{"items":2230,"total":2266},[2231,2237,2242,2247,2252,2256,2261],{"slug":1004,"name":1004,"fn":2102,"description":2103,"org":2232,"tags":2233,"stars":19,"repoUrl":20,"updatedAt":2115},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[2234,2235,2236],{"name":2107,"slug":2108,"type":15},{"name":2110,"slug":2111,"type":15},{"name":2113,"slug":2114,"type":15},{"slug":2117,"name":2117,"fn":2118,"description":2119,"org":2238,"tags":2239,"stars":19,"repoUrl":20,"updatedAt":2124},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[2240,2241],{"name":2107,"slug":2108,"type":15},{"name":2113,"slug":2114,"type":15},{"slug":2126,"name":2126,"fn":2127,"description":2128,"org":2243,"tags":2244,"stars":19,"repoUrl":20,"updatedAt":2133},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[2245,2246],{"name":2107,"slug":2108,"type":15},{"name":2113,"slug":2114,"type":15},{"slug":2135,"name":2135,"fn":2136,"description":2137,"org":2248,"tags":2249,"stars":19,"repoUrl":20,"updatedAt":2144},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[2250,2251],{"name":2107,"slug":2108,"type":15},{"name":2142,"slug":2143,"type":15},{"slug":2146,"name":2146,"fn":2147,"description":2148,"org":2253,"tags":2254,"stars":19,"repoUrl":20,"updatedAt":2154},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[2255],{"name":2152,"slug":2153,"type":15},{"slug":2156,"name":2156,"fn":2157,"description":2158,"org":2257,"tags":2258,"stars":19,"repoUrl":20,"updatedAt":2167},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[2259,2260],{"name":2162,"slug":2163,"type":15},{"name":2165,"slug":2166,"type":15},{"slug":2169,"name":2169,"fn":2170,"description":2171,"org":2262,"tags":2263,"stars":19,"repoUrl":20,"updatedAt":2176},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[2264,2265],{"name":2113,"slug":2114,"type":15},{"name":2165,"slug":2166,"type":15},31]