[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill-jetbrains-mps-quotations":3,"mdc--vefmiy-key":35,"related-repo-jetbrains-mps-quotations":1321,"related-org-jetbrains-mps-quotations":1396},{"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-quotations","debug MPS quotations and anti-quotations","Use when writing or debugging MPS quotations and anti-quotations — \"node literals\" that create SNode trees inline in behavior, typesystem, intentions, generator, and other model code. Covers heavy quotations (`Quotation`, `\u003C...>`), light quotations (`NodeBuilder`, constructor-style for bootstrapping), and the four anti-quotation varieties: child (`%(...)%`), list (`*(...)*`), reference (`^(...)^`), property (`$(...)$`). Reach for this skill whenever the task involves splicing runtime values into quoted node trees or choosing between heavy and light quotations.",{"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],{"name":13,"slug":14,"type":15},"Architecture","architecture","tag",{"name":17,"slug":18,"type":15},"Engineering","engineering",{"name":20,"slug":21,"type":15},"Debugging","debugging",1650,"https:\u002F\u002Fgithub.com\u002FJetBrains\u002FMPS","2026-07-13T06:45:07.198528",null,311,[28,29],"domain-specific-language","dsl",{"repoUrl":23,"stars":22,"forks":26,"topics":31,"description":32},[28,29],"JetBrains Meta programming System","https:\u002F\u002Fgithub.com\u002FJetBrains\u002FMPS\u002Ftree\u002FHEAD\u002Fplugins\u002Fmcp-tools\u002Fresources\u002Fjetbrains\u002Fmps\u002Fagents\u002Fmcp\u002Fskills\u002Fmps-quotations","---\nname: mps-quotations\ndescription: >-\n  Use when writing or debugging MPS quotations and anti-quotations — \"node literals\" that create SNode trees inline in behavior, typesystem, intentions, generator, and other model code. Covers heavy quotations (`Quotation`, `\u003C...>`), light quotations (`NodeBuilder`, constructor-style for bootstrapping), and the four anti-quotation varieties: child (`%(...)%`), list (`*(...)*`), reference (`^(...)^`), property (`$(...)$`). Reach for this skill whenever the task involves splicing runtime values into quoted node trees or choosing between heavy and light quotations.\ntype: reference\n---\n\n# MPS Quotations and Anti-quotations\n\nA **quotation** is a node literal — a concise expression that evaluates to an `SNode` (or tree of `SNode`s) at runtime. Instead of building nodes manually via the smodel API, you write the desired structure in the target language syntax and let MPS wrap it. Anti-quotations (\"antiquotations\") are escape holes inside a quotation where a runtime expression is spliced in.\n\n**Required used language:** `jetbrains.mps.lang.quotation` (UUID `3a13115c-633c-4c5c-bbcc-75c4219e9555`)\n\n## Critical Directives\n\n- **Quotations do not call behavior constructors.** Using `\u003CCar()>` produces an `SNode` of concept `Car` without running its constructor. Use `new node\u003CCar>()` (smodel API) when you need the constructor to run.\n- Use the **concept identifier inside a quotation, not an alias.** Write `\u003CIntegerType>`, not `\u003Cint>`.\n- All four anti-quotation kinds attach via the inherited `smodelAttribute` role on any `BaseConcept`. The anti-quotation node is a *sibling attribute* of the host node, **not** a replacement child. The runtime substitution happens during materialisation. See `references\u002Fantiquotations.md`.\n- **`ListAntiquotation` constraint:** the list role must contain at least one placeholder child before you can activate a list antiquotation. The placeholder is replaced at runtime with zero-or-more nodes.\n- `PropertyAntiquotation.propertyId` and `ReferenceAntiquotation.linkId` are filled in **automatically by MPS** when you type `$` \u002F `^` in a property\u002Freference cell. Do not construct these encoded ids manually unless you have already verified the exact `language-uuid\u002Fconcept-id\u002Fproperty-or-link-id` form against the running MPS. See `references\u002Fproperty-and-reference-ids.md`.\n- Prefer **heavy quotation** (`\u003C...>`) for readability; switch to **light quotation** (`NodeBuilder`) only for bootstrapping (the target language can't be a `used language`), for generators-of-generators, or when nesting depth makes embedded syntax unreadable. See `references\u002Fheavy-vs-light.md`.\n- The deprecated `NodeBuilderInitLink.expression` (cardinality 0..1) was removed in 2019.2. Use `initValue` with a `NodeBuilderExpression` instead.\n- Edit quotation-bearing models through MPS MCP tools (`mps_mcp_insert_root_node_from_json`, `mps_mcp_update_node`). Do not hand-edit `.mps` files.\n- Validate with `mps_mcp_check_root_node_problems`; quotations frequently expose missing used-languages on the host model (the quoted concept's language must be a *used language*, not just a dependency).\n\n## Common-Path Workflow\n\n1. Add `jetbrains.mps.lang.quotation` to the host model's **used languages**, plus the language whose concepts will be quoted.\n2. In the editor, type `\u003C` in an expression position to insert a `Quotation`, then type the desired surface syntax of the quoted node. The quoted concept must be available as a used language; otherwise switch to `NodeBuilder`.\n3. To inject runtime values, place the caret inside the appropriate cell and type:\n   - `%` — child antiquotation (replaces the child node)\n   - `*` — list antiquotation (replaces a list-position node; requires a placeholder child first)\n   - `^` — reference antiquotation (replaces a reference target)\n   - `$` — property antiquotation (replaces a property value)\n4. For bootstrapping or deep nesting, use the *Convert Quotation to NodeBuilder* intention (or insert `NodeBuilder` directly).\n5. Validate with `mps_mcp_check_root_node_problems`; rebuild the host language if needed.\n\n## When To Use Which Form\n\n| Situation | Recommended form |\n|---|---|\n| Short, readable node literal in behavior \u002F typesystem \u002F intentions code | Heavy quotation |\n| One or more children computed at runtime | Heavy quotation + child\u002Flist antiquotation |\n| A property computed at runtime | Heavy quotation + property antiquotation |\n| A reference target resolved at runtime | Heavy quotation + reference antiquotation |\n| Bootstrapping (generating language infrastructure) or concept not importable | Light quotation (`NodeBuilder`) |\n| More than 3 levels of nesting where embedded syntax is confusing | Light quotation (`NodeBuilder`) |\n\n## Related Skills\n\n- `mps-aspect-behavior` — behavior bodies frequently use quotations to build sub-trees; remember constructors do not fire when materialising a quotation.\n- `mps-aspect-typesystem` — `\u003CTypeConcept>` literals inside rule bodies are heavy quotations; the typesystem model typically imports `jetbrains.mps.lang.quotation` as a used language. The `:==:`\u002F`:\u003C=:` body shapes are in `mps-aspect-typesystem` `json-blueprints.md`.\n- `mps-aspect-generator` — template macros are a different mechanism for building target trees; quotations are used in non-template code (filters, mapping scripts, conditions) within the generator model.\n- `mps-aspect-migrations` — `\u003CNewConcept>` plus `^(oldNode.target)^` is the canonical shape inside migration rewrite scripts (`references\u002Fantiquotation-reference.md` includes the verbatim example).\n- `mps-aspect-intentions` — the `replace_invokeOperation_with_compactInvoke` example shipping with the closures language uses `\u003C%(...)%>` + `*(...)*` to rebuild an expression tree.\n- `mps-aspect-structure-concepts` — when the quoted concept's link\u002Fproperty metadata is needed; `propertyId` \u002F `linkId` encode the persistent form of those declarations.\n- `mps-model-manipulation` — the smodel operations and BaseLanguage expressions used inside antiquotation `expression` slots.\n\n## Reference Index\n\n- Open `references\u002Fheavy-vs-light.md` when deciding between `Quotation` and `NodeBuilder` — the surface trade-offs, the bootstrapping rationale, and the recommendation table for typical situations.\n- Open `references\u002Fheavy-quotation.md` when authoring a basic `Quotation` (`\u003C...>`) — concept structure, the `quotedNode`\u002F`smodelAttribute`\u002F`modelToCreate` roles, JSON blueprint, and the verbatim `MoneyType` example from the baseLanguage.money generator.\n- Open `references\u002Fantiquotations.md` for the full antiquotation catalog — the four kinds at a glance, attachment mechanism via `smodelAttribute`, syntax (`%`\u002F`*`\u002F`^`\u002F`$`), the `AbstractAntiquotation` interface, the `Antiquotation` (child) shape, and the closures-intention worked example combining child + list antiquotations.\n- Open `references\u002Fantiquotation-list.md` when working with `ListAntiquotation` (`*(...)*`) — placeholder requirement, expression type (`nlist\u003C..>` \u002F `Iterable`), and how it cooperates with multi-cardinality list roles.\n- Open `references\u002Fantiquotation-property.md` when writing or debugging a `PropertyAntiquotation` (`$(...)$`) — concept structure, `propertyId` \u002F `name_DebugInfo` \u002F `stringValueMigrated` properties, and the full JSON printout from the quotation editor test.\n- Open `references\u002Fantiquotation-reference.md` when a runtime reference target must be spliced — `ReferenceAntiquotation` (`^(...)^`) shape, `linkId` \u002F `role_DebugInfo` properties, and the migration-script example creating a `NewComponentRef` whose target is computed at runtime.\n- Open `references\u002Fproperty-and-reference-ids.md` for the encoded id formats used by `PropertyAntiquotation.propertyId` and `ReferenceAntiquotation.linkId` — `language-uuid\u002Fconcept-id\u002Fproperty-or-link-id` — and the rule \"let MPS fill these in\" when editing in the IDE.\n- Open `references\u002Flight-quotation.md` when using `NodeBuilder` — the constructor-style notation, `NodeBuilderNode` \u002F `NodeBuilderInitLink` \u002F `NodeBuilderInitProperty` \u002F `NodeBuilderExpression` (`#`) concept structure, deprecation note on `NodeBuilderInitLink.expression`, JSON blueprint, and the verbatim nested-NodeBuilder example from `jetbrains.mps.kotlin.smodel.behavior`.\n- Open `references\u002Fmodel-and-node-id.md` when the quotation needs to land in a specific model or with a specific node id — `ModelNodeInitializer` shape and JSON blueprint.\n- Open `references\u002Fconcept-catalog.md` for the quick lookup table — FQNs and aliases of every `jetbrains.mps.lang.quotation.structure.*` concept, plus the key role names and cardinalities used in JSON blueprints.\n- Open `references\u002Fsource-locations.md` for paths inside the MPS repository — where to find structure\u002Fbehavior\u002Ftypesystem\u002Feditor of the quotation language, generation+editor test cases, and the source models behind every example used in this skill.\n",{"data":36,"body":38},{"name":4,"description":6,"type":37},"reference",{"type":39,"children":40},"root",[41,50,80,106,113,429,435,565,571,688,694,888,894],{"type":42,"tag":43,"props":44,"children":46},"element","h1",{"id":45},"mps-quotations-and-anti-quotations",[47],{"type":48,"value":49},"text","MPS Quotations and Anti-quotations",{"type":42,"tag":51,"props":52,"children":53},"p",{},[54,56,62,64,71,73,78],{"type":48,"value":55},"A ",{"type":42,"tag":57,"props":58,"children":59},"strong",{},[60],{"type":48,"value":61},"quotation",{"type":48,"value":63}," is a node literal — a concise expression that evaluates to an ",{"type":42,"tag":65,"props":66,"children":68},"code",{"className":67},[],[69],{"type":48,"value":70},"SNode",{"type":48,"value":72}," (or tree of ",{"type":42,"tag":65,"props":74,"children":76},{"className":75},[],[77],{"type":48,"value":70},{"type":48,"value":79},"s) at runtime. Instead of building nodes manually via the smodel API, you write the desired structure in the target language syntax and let MPS wrap it. Anti-quotations (\"antiquotations\") are escape holes inside a quotation where a runtime expression is spliced in.",{"type":42,"tag":51,"props":81,"children":82},{},[83,88,90,96,98,104],{"type":42,"tag":57,"props":84,"children":85},{},[86],{"type":48,"value":87},"Required used language:",{"type":48,"value":89}," ",{"type":42,"tag":65,"props":91,"children":93},{"className":92},[],[94],{"type":48,"value":95},"jetbrains.mps.lang.quotation",{"type":48,"value":97}," (UUID ",{"type":42,"tag":65,"props":99,"children":101},{"className":100},[],[102],{"type":48,"value":103},"3a13115c-633c-4c5c-bbcc-75c4219e9555",{"type":48,"value":105},")",{"type":42,"tag":107,"props":108,"children":110},"h2",{"id":109},"critical-directives",[111],{"type":48,"value":112},"Critical Directives",{"type":42,"tag":114,"props":115,"children":116},"ul",{},[117,159,187,230,246,303,352,381,410],{"type":42,"tag":118,"props":119,"children":120},"li",{},[121,126,128,134,136,141,143,149,151,157],{"type":42,"tag":57,"props":122,"children":123},{},[124],{"type":48,"value":125},"Quotations do not call behavior constructors.",{"type":48,"value":127}," Using ",{"type":42,"tag":65,"props":129,"children":131},{"className":130},[],[132],{"type":48,"value":133},"\u003CCar()>",{"type":48,"value":135}," produces an ",{"type":42,"tag":65,"props":137,"children":139},{"className":138},[],[140],{"type":48,"value":70},{"type":48,"value":142}," of concept ",{"type":42,"tag":65,"props":144,"children":146},{"className":145},[],[147],{"type":48,"value":148},"Car",{"type":48,"value":150}," without running its constructor. Use ",{"type":42,"tag":65,"props":152,"children":154},{"className":153},[],[155],{"type":48,"value":156},"new node\u003CCar>()",{"type":48,"value":158}," (smodel API) when you need the constructor to run.",{"type":42,"tag":118,"props":160,"children":161},{},[162,164,169,171,177,179,185],{"type":48,"value":163},"Use the ",{"type":42,"tag":57,"props":165,"children":166},{},[167],{"type":48,"value":168},"concept identifier inside a quotation, not an alias.",{"type":48,"value":170}," Write ",{"type":42,"tag":65,"props":172,"children":174},{"className":173},[],[175],{"type":48,"value":176},"\u003CIntegerType>",{"type":48,"value":178},", not ",{"type":42,"tag":65,"props":180,"children":182},{"className":181},[],[183],{"type":48,"value":184},"\u003Cint>",{"type":48,"value":186},".",{"type":42,"tag":118,"props":188,"children":189},{},[190,192,198,200,206,208,214,216,221,223,229],{"type":48,"value":191},"All four anti-quotation kinds attach via the inherited ",{"type":42,"tag":65,"props":193,"children":195},{"className":194},[],[196],{"type":48,"value":197},"smodelAttribute",{"type":48,"value":199}," role on any ",{"type":42,"tag":65,"props":201,"children":203},{"className":202},[],[204],{"type":48,"value":205},"BaseConcept",{"type":48,"value":207},". The anti-quotation node is a ",{"type":42,"tag":209,"props":210,"children":211},"em",{},[212],{"type":48,"value":213},"sibling attribute",{"type":48,"value":215}," of the host node, ",{"type":42,"tag":57,"props":217,"children":218},{},[219],{"type":48,"value":220},"not",{"type":48,"value":222}," a replacement child. The runtime substitution happens during materialisation. See ",{"type":42,"tag":65,"props":224,"children":226},{"className":225},[],[227],{"type":48,"value":228},"references\u002Fantiquotations.md",{"type":48,"value":186},{"type":42,"tag":118,"props":231,"children":232},{},[233,244],{"type":42,"tag":57,"props":234,"children":235},{},[236,242],{"type":42,"tag":65,"props":237,"children":239},{"className":238},[],[240],{"type":48,"value":241},"ListAntiquotation",{"type":48,"value":243}," constraint:",{"type":48,"value":245}," the list role must contain at least one placeholder child before you can activate a list antiquotation. The placeholder is replaced at runtime with zero-or-more nodes.",{"type":42,"tag":118,"props":247,"children":248},{},[249,255,257,263,265,270,272,278,280,286,288,294,296,302],{"type":42,"tag":65,"props":250,"children":252},{"className":251},[],[253],{"type":48,"value":254},"PropertyAntiquotation.propertyId",{"type":48,"value":256}," and ",{"type":42,"tag":65,"props":258,"children":260},{"className":259},[],[261],{"type":48,"value":262},"ReferenceAntiquotation.linkId",{"type":48,"value":264}," are filled in ",{"type":42,"tag":57,"props":266,"children":267},{},[268],{"type":48,"value":269},"automatically by MPS",{"type":48,"value":271}," when you type ",{"type":42,"tag":65,"props":273,"children":275},{"className":274},[],[276],{"type":48,"value":277},"$",{"type":48,"value":279}," \u002F ",{"type":42,"tag":65,"props":281,"children":283},{"className":282},[],[284],{"type":48,"value":285},"^",{"type":48,"value":287}," in a property\u002Freference cell. Do not construct these encoded ids manually unless you have already verified the exact ",{"type":42,"tag":65,"props":289,"children":291},{"className":290},[],[292],{"type":48,"value":293},"language-uuid\u002Fconcept-id\u002Fproperty-or-link-id",{"type":48,"value":295}," form against the running MPS. See ",{"type":42,"tag":65,"props":297,"children":299},{"className":298},[],[300],{"type":48,"value":301},"references\u002Fproperty-and-reference-ids.md",{"type":48,"value":186},{"type":42,"tag":118,"props":304,"children":305},{},[306,308,313,315,321,323,328,329,335,337,343,345,351],{"type":48,"value":307},"Prefer ",{"type":42,"tag":57,"props":309,"children":310},{},[311],{"type":48,"value":312},"heavy quotation",{"type":48,"value":314}," (",{"type":42,"tag":65,"props":316,"children":318},{"className":317},[],[319],{"type":48,"value":320},"\u003C...>",{"type":48,"value":322},") for readability; switch to ",{"type":42,"tag":57,"props":324,"children":325},{},[326],{"type":48,"value":327},"light quotation",{"type":48,"value":314},{"type":42,"tag":65,"props":330,"children":332},{"className":331},[],[333],{"type":48,"value":334},"NodeBuilder",{"type":48,"value":336},") only for bootstrapping (the target language can't be a ",{"type":42,"tag":65,"props":338,"children":340},{"className":339},[],[341],{"type":48,"value":342},"used language",{"type":48,"value":344},"), for generators-of-generators, or when nesting depth makes embedded syntax unreadable. See ",{"type":42,"tag":65,"props":346,"children":348},{"className":347},[],[349],{"type":48,"value":350},"references\u002Fheavy-vs-light.md",{"type":48,"value":186},{"type":42,"tag":118,"props":353,"children":354},{},[355,357,363,365,371,373,379],{"type":48,"value":356},"The deprecated ",{"type":42,"tag":65,"props":358,"children":360},{"className":359},[],[361],{"type":48,"value":362},"NodeBuilderInitLink.expression",{"type":48,"value":364}," (cardinality 0..1) was removed in 2019.2. Use ",{"type":42,"tag":65,"props":366,"children":368},{"className":367},[],[369],{"type":48,"value":370},"initValue",{"type":48,"value":372}," with a ",{"type":42,"tag":65,"props":374,"children":376},{"className":375},[],[377],{"type":48,"value":378},"NodeBuilderExpression",{"type":48,"value":380}," instead.",{"type":42,"tag":118,"props":382,"children":383},{},[384,386,392,394,400,402,408],{"type":48,"value":385},"Edit quotation-bearing models through MPS MCP tools (",{"type":42,"tag":65,"props":387,"children":389},{"className":388},[],[390],{"type":48,"value":391},"mps_mcp_insert_root_node_from_json",{"type":48,"value":393},", ",{"type":42,"tag":65,"props":395,"children":397},{"className":396},[],[398],{"type":48,"value":399},"mps_mcp_update_node",{"type":48,"value":401},"). 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lookup table — FQNs and aliases of every ",{"type":42,"tag":65,"props":1302,"children":1304},{"className":1303},[],[1305],{"type":48,"value":1306},"jetbrains.mps.lang.quotation.structure.*",{"type":48,"value":1308}," concept, plus the key role names and cardinalities used in JSON blueprints.",{"type":42,"tag":118,"props":1310,"children":1311},{},[1312,1313,1319],{"type":48,"value":901},{"type":42,"tag":65,"props":1314,"children":1316},{"className":1315},[],[1317],{"type":48,"value":1318},"references\u002Fsource-locations.md",{"type":48,"value":1320}," for paths inside the MPS repository — where to find structure\u002Fbehavior\u002Ftypesystem\u002Feditor of the quotation language, generation+editor test cases, and the source models behind every example used in this skill.",{"items":1322,"total":1395},[1323,1335,1344,1352,1363,1373,1386],{"slug":1324,"name":1324,"fn":1325,"description":1326,"org":1327,"tags":1328,"stars":22,"repoUrl":23,"updatedAt":1334},"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},[1329,1330,1333],{"name":13,"slug":14,"type":15},{"name":1331,"slug":1332,"type":15},"Configuration","configuration",{"name":17,"slug":18,"type":15},"2026-07-17T06:06:57.311661",{"slug":1336,"name":1336,"fn":1337,"description":1338,"org":1339,"tags":1340,"stars":22,"repoUrl":23,"updatedAt":1343},"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},[1341,1342],{"name":13,"slug":14,"type":15},{"name":17,"slug":18,"type":15},"2026-07-17T06:04:48.066901",{"slug":705,"name":705,"fn":1345,"description":1346,"org":1347,"tags":1348,"stars":22,"repoUrl":23,"updatedAt":1351},"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},[1349,1350],{"name":13,"slug":14,"type":15},{"name":17,"slug":18,"type":15},"2026-07-13T06:45:21.757084",{"slug":1353,"name":1353,"fn":1354,"description":1355,"org":1356,"tags":1357,"stars":22,"repoUrl":23,"updatedAt":1362},"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},[1358,1359],{"name":13,"slug":14,"type":15},{"name":1360,"slug":1361,"type":15},"Code Analysis","code-analysis","2026-07-23T05:41:33.639365",{"slug":1364,"name":1364,"fn":1365,"description":1366,"org":1367,"tags":1368,"stars":22,"repoUrl":23,"updatedAt":1372},"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},[1369],{"name":1370,"slug":1371,"type":15},"Data Analysis","data-analysis","2026-07-13T06:45:19.114674",{"slug":1374,"name":1374,"fn":1375,"description":1376,"org":1377,"tags":1378,"stars":22,"repoUrl":23,"updatedAt":1385},"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},[1379,1382],{"name":1380,"slug":1381,"type":15},"Design","design",{"name":1383,"slug":1384,"type":15},"UI Components","ui-components","2026-07-23T05:41:56.638151",{"slug":1387,"name":1387,"fn":1388,"description":1389,"org":1390,"tags":1391,"stars":22,"repoUrl":23,"updatedAt":1394},"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},[1392,1393],{"name":17,"slug":18,"type":15},{"name":1383,"slug":1384,"type":15},"2026-07-23T05:41:49.666535",31,{"items":1397,"total":1478},[1398,1404,1409,1414,1419,1423,1428,1433,1442,1451,1459,1469],{"slug":1324,"name":1324,"fn":1325,"description":1326,"org":1399,"tags":1400,"stars":22,"repoUrl":23,"updatedAt":1334},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1401,1402,1403],{"name":13,"slug":14,"type":15},{"name":1331,"slug":1332,"type":15},{"name":17,"slug":18,"type":15},{"slug":1336,"name":1336,"fn":1337,"description":1338,"org":1405,"tags":1406,"stars":22,"repoUrl":23,"updatedAt":1343},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1407,1408],{"name":13,"slug":14,"type":15},{"name":17,"slug":18,"type":15},{"slug":705,"name":705,"fn":1345,"description":1346,"org":1410,"tags":1411,"stars":22,"repoUrl":23,"updatedAt":1351},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1412,1413],{"name":13,"slug":14,"type":15},{"name":17,"slug":18,"type":15},{"slug":1353,"name":1353,"fn":1354,"description":1355,"org":1415,"tags":1416,"stars":22,"repoUrl":23,"updatedAt":1362},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1417,1418],{"name":13,"slug":14,"type":15},{"name":1360,"slug":1361,"type":15},{"slug":1364,"name":1364,"fn":1365,"description":1366,"org":1420,"tags":1421,"stars":22,"repoUrl":23,"updatedAt":1372},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1422],{"name":1370,"slug":1371,"type":15},{"slug":1374,"name":1374,"fn":1375,"description":1376,"org":1424,"tags":1425,"stars":22,"repoUrl":23,"updatedAt":1385},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1426,1427],{"name":1380,"slug":1381,"type":15},{"name":1383,"slug":1384,"type":15},{"slug":1387,"name":1387,"fn":1388,"description":1389,"org":1429,"tags":1430,"stars":22,"repoUrl":23,"updatedAt":1394},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1431,1432],{"name":17,"slug":18,"type":15},{"name":1383,"slug":1384,"type":15},{"slug":1434,"name":1434,"fn":1435,"description":1436,"org":1437,"tags":1438,"stars":22,"repoUrl":23,"updatedAt":1441},"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},[1439,1440],{"name":13,"slug":14,"type":15},{"name":17,"slug":18,"type":15},"2026-07-13T06:44:59.507855",{"slug":771,"name":771,"fn":1443,"description":1444,"org":1445,"tags":1446,"stars":22,"repoUrl":23,"updatedAt":1450},"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},[1447,1448,1449],{"name":13,"slug":14,"type":15},{"name":1360,"slug":1361,"type":15},{"name":17,"slug":18,"type":15},"2026-07-17T06:06:58.042999",{"slug":816,"name":816,"fn":1452,"description":1453,"org":1454,"tags":1455,"stars":22,"repoUrl":23,"updatedAt":1458},"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},[1456,1457],{"name":13,"slug":14,"type":15},{"name":17,"slug":18,"type":15},"2026-07-23T05:41:48.692899",{"slug":782,"name":782,"fn":1460,"description":1461,"org":1462,"tags":1463,"stars":22,"repoUrl":23,"updatedAt":1468},"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},[1464,1465],{"name":20,"slug":21,"type":15},{"name":1466,"slug":1467,"type":15},"Migration","migration","2026-07-13T06:45:20.372122",{"slug":851,"name":851,"fn":1470,"description":1471,"org":1472,"tags":1473,"stars":22,"repoUrl":23,"updatedAt":1477},"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},[1474],{"name":1475,"slug":1476,"type":15},"Data Modeling","data-modeling","2026-07-23T05:41:30.705975",188]