[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill-jetbrains-ue-test-authoring":3,"mdc-8v54kz-key":32,"related-org-jetbrains-ue-test-authoring":1208,"related-repo-jetbrains-ue-test-authoring":1341},{"slug":4,"name":4,"fn":5,"description":6,"org":7,"tags":11,"stars":22,"repoUrl":23,"updatedAt":24,"license":25,"forks":22,"topics":26,"repo":27,"sourceUrl":30,"mdContent":31},"ue-test-authoring","author Unreal Engine automated tests","Use when writing or modifying UE automated tests (Automation, CQTest, Functional, Gauntlet, LowLevel) with Rider MCP available. Value over bash\u002Fgrep: IDE diagnostics catch test registration errors, wrong RunTest return type, and missing includes before a build; get_symbol_info verifies the API under test. DO NOT TRIGGER for: debugging existing test failures (use ue-live-debugging), Blueprint-only testing. When Rider MCP is unavailable, runs in reduced mode — standard file tools only, IDE diagnostics skipped.",{"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},"Unreal Engine","unreal-engine","tag",{"name":17,"slug":18,"type":15},"QA","qa",{"name":20,"slug":21,"type":15},"Testing","testing",1,"https:\u002F\u002Fgithub.com\u002FJetBrains\u002Frider-skills","2026-07-13T06:44:19.708365",null,[],{"repoUrl":23,"stars":22,"forks":22,"topics":28,"description":29},[],"Collection of skills related for .NET and GameDev","https:\u002F\u002Fgithub.com\u002FJetBrains\u002Frider-skills\u002Ftree\u002FHEAD\u002Fskills\u002Fue-test-authoring","---\nname: ue-test-authoring\ndescription: \"Use when writing or modifying UE automated tests (Automation, CQTest, Functional, Gauntlet, LowLevel) with Rider MCP available. Value over bash\u002Fgrep: IDE diagnostics catch test registration errors, wrong RunTest return type, and missing includes before a build; get_symbol_info verifies the API under test. DO NOT TRIGGER for: debugging existing test failures (use ue-live-debugging), Blueprint-only testing. When Rider MCP is unavailable, runs in reduced mode — standard file tools only, IDE diagnostics skipped.\"\nallowed-tools: Read Glob Grep Bash Write Edit ToolSearch\nmetadata:\n  argument-hint: \"[test type, feature\u002Fsystem to test, or failing scenario]\"\n---\n\n# UE Test Authoring\n\nEnd-to-end workflow for writing Unreal Engine automated tests backed by **Rider MCP** for IDE-grade code quality.  \nThree additions over plain test writing: (1) Rider diagnostics catch issues before a full build, (2) `lint_files` enforces consistency across test files, (3) `get_project_problems` surfaces cross-file issues invisible to grep.\n\n---\n\n## GATE — mandatory checks before any test code is written\n\n### 1. UE Project Check\n\nVerify the current working directory contains a `.uproject` file:\n\n```bash\nfind . -maxdepth 1 -name \"*.uproject\" | head -1\n```\n\nIf **no `.uproject` found** → STOP.\n\n> \"This skill requires an Unreal Engine project (a `.uproject` file must be in the working directory). The current directory does not appear to be a UE project. Navigate to the project root and retry.\"\n\n### 2. Task Is Test-Authoring Check\n\nThe task must involve **writing or modifying test code**. If the user is asking about something that has no test authoring component — e.g. fixing a runtime bug, building the project, or changing non-test source files — clarify scope before proceeding.\n\nIf there is no test to write or modify → STOP and ask the user what test they want authored.\n\n### 3. Rider MCP Availability Check\n\nCheck the `\u003Csystem-reminder>` deferred-tool list for Rider MCP tools. Load live schemas with ToolSearch before calling any tool. Schemas are **authoritative for parameter names** — never guess. If `execute_tool` is the only tool returned, use CLI mode (see `reference\u002Frider-mcp-tools.md — execute_tool mode`).\n\nIf **no Rider MCP tools appear in the deferred list**:\n\n> \"Rider MCP tools are unavailable. Open Rider with this project loaded and the MCP server enabled, then retry. Falling back to standard file tools — IDE diagnostics will not run.\"\n\nProceed with standard tools (Read\u002FWrite\u002FEdit\u002FGrep\u002FBash) only, skipping all `mcp__\u003Cprefix>__*` steps. Document that quality steps were skipped.\n\n---\n\n## Path Selection\n\n**Fast path** for adding a single test case to an existing test file — no new module, no new framework, no `Build.cs` changes:\n1. Verify `.uproject` (Gate 1)\n2. Locate the existing test file with rg\u002FGrep or Rider `search_text`\n3. Read 1–2 existing test cases in the same file\n4. Add the minimal test case using the standard Edit tool\n5. Run `get_file_problems` on the changed file if Rider MCP is available\n6. Show git diff\n\n**Full workflow** when creating a new test module, adding a new framework, changing `Build.cs`, or modifying multiple test files → continue to Checklist below.\n\n## Checklist\n\nUse the agent's native planning\u002Ftodo mechanism when available. For simple one-file tasks, keep the plan implicit and proceed directly. For complex changes, track:\n\n1. **GATE** — UE project check + test task check + Rider prefix resolution\n2. **Clarify** — ask targeted questions if the framework or scope is ambiguous (skip if clear)\n3. **Select framework** — choose the right test framework using the decision guide below\n4. **Pre-flight** — read `.uproject`, locate existing test modules, scan patterns via Rider\n5. **Write test** — create or modify test `.h`\u002F`.cpp` using framework patterns\n6. **Rider diagnostics** — `get_file_problems` per changed file; fix all errors and warnings\n7. **Batch lint** *(if multiple test files changed or new patterns introduced)* — `lint_files`; fix remaining issues\n8. **Build** — `build_solution_start`; poll `build_solution_state` until done; fix errors\n9. **Post-build quality** *(for non-trivial changes)* — `get_project_problems`; address Critical\u002FImportant\n10. **Reformat** — `reformat_file` on each changed file\n\n---\n\n## Workflow\n\n**Search routing:** use rg\u002FGrep for portable text discovery; use Rider `search_text`\u002F`search_file` when IDE index, generated\u002Freflected UE code, unsaved editor state, or result compactness is likely to help. Use Rider semantic tools (`search_symbol`, `get_file_problems`, `lint_files`, build, `get_project_problems`) for code intelligence.\n\n### Step 0 — Clarify (if ambiguous)\n\nSkip if the request names a specific framework, class, or test scenario.\n\nAsk **one question at a time**, max two questions total:\n\n- **\"Is this a pure logic test (no actors, no world) or does it need an in-game context?\"** — determines Automation\u002FCQTest vs Functional Test\n- **\"Does the test need to verify replication or server\u002Fclient behavior?\"** — affects CQTest `PIENetworkComponent` vs plain test\n- **\"Is there an existing test module I should add to, or should this be a new module?\"** — check with `list_directory_tree` before asking\n\n### Step 1 — Select Framework\n\nPick the minimal framework that covers the testing need. See `reference\u002Fue-test-patterns.md — Framework Selection` for the decision matrix.\n\n### Step 2 — Pre-flight\n\nRead project context before writing any test: `.uproject` file and `Source\u002F\u003CTestModule>\u002F\u003CTestModule>.Build.cs` using the standard Read tool.\n\nFind existing test modules and patterns using `search_text` (look for `IMPLEMENT_SIMPLE_AUTOMATION_TEST`, `TEST_CLASS`, `DEFINE_SPEC`). Use Glob or `list_directory_tree` to browse directory structure.\n\nUse `search_symbol` to locate the module under test for `Build.cs` dependency lookup.\n\nRead 1–2 existing test files in the same area using the standard Read tool to match conventions.\n\n**Determine from pre-flight:** whether a test module exists (add to it vs. create new), which test macros the project uses (match them), and required `PrivateDependencyModuleNames`.\n\nSee `reference\u002Fue-test-patterns.md — New Test Module Setup` if a new module is needed.\n\n### Step 3 — Write Test\n\n**Create new test module** (if none exists) — see `reference\u002Fue-test-patterns.md — New Test Module Setup`.\n\n**Create a new test file** using the standard Write tool.\n\n**Modify an existing test file** using the standard Edit tool.\n\nSee `reference\u002Fue-test-patterns.md` for ready-to-use patterns for each framework and critical pitfalls.\n\n### Step 4 — Rider Diagnostics (per file)\n\nAfter writing each file, run `get_file_problems` on it immediately.\n\n**Act on every result:**\n- **Error** → fix before proceeding; re-run `get_file_problems` to confirm clear\n- **Warning** → fix unless it's a known intentional pattern (document why if skipping)\n- **Hint \u002F Info** → note for later; don't block on these\n\nIterate: edit → diagnose → edit until zero errors and zero warnings on all changed files.\n\n### Step 5 — Batch Lint *(skip for isolated single-file test additions)*\n\nIf multiple test files changed or new patterns were introduced, run `lint_files`.\n\nFix any issues surfaced here that `get_file_problems` missed (cross-file include violations, project-level style rules).\n\n### Step 6 — Build\n\nCompile via Rider using `build_solution_start` — do NOT shell-build or ask the user to rebuild manually.\n\nPoll using `build_solution_state` until `state != \"Running\"`.\n\n**On build failure:**\n- Read the error output from `build_solution_state`\n- Identify which file\u002Fline caused the error\n- Fix with the standard Edit tool, re-run `get_file_problems` on the fixed file, then rebuild\n- **Do NOT proceed to Step 7 with build errors outstanding**\n\n### Step 7 — Post-Build Quality Gate *(skip for small test additions)*\n\nFor non-trivial changes, run `get_project_problems`. Filter results to files you changed. For each issue:\n- **Error** → fix immediately\n- **Warning on your files** → fix unless intentionally deferred\n\n### Step 8 — Reformat\n\nUse `reformat_file` on every file you created or modified.\n\n---\n\nsee: reference\u002Frider-mcp-tools.md — ALL Rider MCP tools: complete parameter reference, execute_tool mode table, UE editor\u002Fasset\u002Fdebugger tools\nsee: reference\u002Frider-tools.md — Test authoring workflow patterns: fix-loop, common lookups, test discovery\nsee: reference\u002Fue-test-patterns.md — Framework patterns (Automation, CQTest, Functional, Gauntlet, LowLevel), new module setup, critical pitfalls\n",{"data":33,"body":37},{"name":4,"description":6,"allowed-tools":34,"metadata":35},"Read Glob Grep Bash Write Edit ToolSearch",{"argument-hint":36},"[test type, feature\u002Fsystem to test, or failing scenario]",{"type":38,"children":39},"root",[40,48,85,89,96,103,116,191,210,226,232,244,249,255,291,302,310,323,326,332,350,406,423,429,434,615,618,624,676,682,687,699,749,755,768,774,794,835,854,859,877,890,896,912,922,932,944,950,962,970,1010,1015,1026,1037,1049,1055,1067,1086,1094,1132,1143,1155,1177,1183,1194,1197,1202],{"type":41,"tag":42,"props":43,"children":44},"element","h1",{"id":4},[45],{"type":46,"value":47},"text","UE Test Authoring",{"type":41,"tag":49,"props":50,"children":51},"p",{},[52,54,60,62,66,68,75,77,83],{"type":46,"value":53},"End-to-end workflow for writing Unreal Engine automated tests backed by ",{"type":41,"tag":55,"props":56,"children":57},"strong",{},[58],{"type":46,"value":59},"Rider MCP",{"type":46,"value":61}," for IDE-grade code quality.",{"type":41,"tag":63,"props":64,"children":65},"br",{},[],{"type":46,"value":67},"\nThree additions over plain test writing: (1) Rider diagnostics catch issues before a full build, (2) ",{"type":41,"tag":69,"props":70,"children":72},"code",{"className":71},[],[73],{"type":46,"value":74},"lint_files",{"type":46,"value":76}," enforces consistency across test files, (3) ",{"type":41,"tag":69,"props":78,"children":80},{"className":79},[],[81],{"type":46,"value":82},"get_project_problems",{"type":46,"value":84}," surfaces cross-file issues invisible to grep.",{"type":41,"tag":86,"props":87,"children":88},"hr",{},[],{"type":41,"tag":90,"props":91,"children":93},"h2",{"id":92},"gate-mandatory-checks-before-any-test-code-is-written",[94],{"type":46,"value":95},"GATE — mandatory checks before any test code is written",{"type":41,"tag":97,"props":98,"children":100},"h3",{"id":99},"_1-ue-project-check",[101],{"type":46,"value":102},"1. 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The current directory does not appear to be a UE project. Navigate to the project root and retry.\"",{"type":41,"tag":97,"props":227,"children":229},{"id":228},"_2-task-is-test-authoring-check",[230],{"type":46,"value":231},"2. Task Is Test-Authoring Check",{"type":41,"tag":49,"props":233,"children":234},{},[235,237,242],{"type":46,"value":236},"The task must involve ",{"type":41,"tag":55,"props":238,"children":239},{},[240],{"type":46,"value":241},"writing or modifying test code",{"type":46,"value":243},". 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Open Rider with this project loaded and the MCP server enabled, then retry. Falling back to standard file tools — IDE diagnostics will not run.\"",{"type":41,"tag":49,"props":311,"children":312},{},[313,315,321],{"type":46,"value":314},"Proceed with standard tools (Read\u002FWrite\u002FEdit\u002FGrep\u002FBash) only, skipping all ",{"type":41,"tag":69,"props":316,"children":318},{"className":317},[],[319],{"type":46,"value":320},"mcp__\u003Cprefix>__*",{"type":46,"value":322}," steps. 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re-run ",{"type":41,"tag":69,"props":984,"children":986},{"className":985},[],[987],{"type":46,"value":398},{"type":46,"value":989}," to confirm clear",{"type":41,"tag":355,"props":991,"children":992},{},[993,998],{"type":41,"tag":55,"props":994,"children":995},{},[996],{"type":46,"value":997},"Warning",{"type":46,"value":999}," → fix unless it's a known intentional pattern (document why if skipping)",{"type":41,"tag":355,"props":1001,"children":1002},{},[1003,1008],{"type":41,"tag":55,"props":1004,"children":1005},{},[1006],{"type":46,"value":1007},"Hint \u002F Info",{"type":46,"value":1009}," → note for later; don't block on these",{"type":41,"tag":49,"props":1011,"children":1012},{},[1013],{"type":46,"value":1014},"Iterate: edit → diagnose → edit until zero errors and zero warnings on all changed files.",{"type":41,"tag":97,"props":1016,"children":1018},{"id":1017},"step-5-batch-lint-skip-for-isolated-single-file-test-additions",[1019,1021],{"type":46,"value":1020},"Step 5 — Batch Lint ",{"type":41,"tag":538,"props":1022,"children":1023},{},[1024],{"type":46,"value":1025},"(skip for isolated single-file test additions)",{"type":41,"tag":49,"props":1027,"children":1028},{},[1029,1031,1036],{"type":46,"value":1030},"If multiple test files changed or new patterns were introduced, run ",{"type":41,"tag":69,"props":1032,"children":1034},{"className":1033},[],[1035],{"type":46,"value":74},{"type":46,"value":876},{"type":41,"tag":49,"props":1038,"children":1039},{},[1040,1042,1047],{"type":46,"value":1041},"Fix any issues surfaced here that ",{"type":41,"tag":69,"props":1043,"children":1045},{"className":1044},[],[1046],{"type":46,"value":398},{"type":46,"value":1048}," missed (cross-file include violations, project-level style rules).",{"type":41,"tag":97,"props":1050,"children":1052},{"id":1051},"step-6-build",[1053],{"type":46,"value":1054},"Step 6 — Build",{"type":41,"tag":49,"props":1056,"children":1057},{},[1058,1060,1065],{"type":46,"value":1059},"Compile via Rider using ",{"type":41,"tag":69,"props":1061,"children":1063},{"className":1062},[],[1064],{"type":46,"value":565},{"type":46,"value":1066}," — do NOT shell-build or ask the user to rebuild manually.",{"type":41,"tag":49,"props":1068,"children":1069},{},[1070,1072,1077,1079,1085],{"type":46,"value":1071},"Poll using ",{"type":41,"tag":69,"props":1073,"children":1075},{"className":1074},[],[1076],{"type":46,"value":573},{"type":46,"value":1078}," until ",{"type":41,"tag":69,"props":1080,"children":1082},{"className":1081},[],[1083],{"type":46,"value":1084},"state != \"Running\"",{"type":46,"value":876},{"type":41,"tag":49,"props":1087,"children":1088},{},[1089],{"type":41,"tag":55,"props":1090,"children":1091},{},[1092],{"type":46,"value":1093},"On build failure:",{"type":41,"tag":700,"props":1095,"children":1096},{},[1097,1107,1112,1124],{"type":41,"tag":355,"props":1098,"children":1099},{},[1100,1102],{"type":46,"value":1101},"Read the error output from ",{"type":41,"tag":69,"props":1103,"children":1105},{"className":1104},[],[1106],{"type":46,"value":573},{"type":41,"tag":355,"props":1108,"children":1109},{},[1110],{"type":46,"value":1111},"Identify which file\u002Fline caused the error",{"type":41,"tag":355,"props":1113,"children":1114},{},[1115,1117,1122],{"type":46,"value":1116},"Fix with the standard Edit tool, re-run ",{"type":41,"tag":69,"props":1118,"children":1120},{"className":1119},[],[1121],{"type":46,"value":398},{"type":46,"value":1123}," on the fixed file, then rebuild",{"type":41,"tag":355,"props":1125,"children":1126},{},[1127],{"type":41,"tag":55,"props":1128,"children":1129},{},[1130],{"type":46,"value":1131},"Do NOT proceed to Step 7 with build errors outstanding",{"type":41,"tag":97,"props":1133,"children":1135},{"id":1134},"step-7-post-build-quality-gate-skip-for-small-test-additions",[1136,1138],{"type":46,"value":1137},"Step 7 — Post-Build Quality Gate ",{"type":41,"tag":538,"props":1139,"children":1140},{},[1141],{"type":46,"value":1142},"(skip for small test additions)",{"type":41,"tag":49,"props":1144,"children":1145},{},[1146,1148,1153],{"type":46,"value":1147},"For non-trivial changes, run ",{"type":41,"tag":69,"props":1149,"children":1151},{"className":1150},[],[1152],{"type":46,"value":82},{"type":46,"value":1154},". Filter results to files you changed. For each issue:",{"type":41,"tag":700,"props":1156,"children":1157},{},[1158,1167],{"type":41,"tag":355,"props":1159,"children":1160},{},[1161,1165],{"type":41,"tag":55,"props":1162,"children":1163},{},[1164],{"type":46,"value":980},{"type":46,"value":1166}," → fix immediately",{"type":41,"tag":355,"props":1168,"children":1169},{},[1170,1175],{"type":41,"tag":55,"props":1171,"children":1172},{},[1173],{"type":46,"value":1174},"Warning on your files",{"type":46,"value":1176}," → fix unless intentionally deferred",{"type":41,"tag":97,"props":1178,"children":1180},{"id":1179},"step-8-reformat",[1181],{"type":46,"value":1182},"Step 8 — Reformat",{"type":41,"tag":49,"props":1184,"children":1185},{},[1186,1187,1192],{"type":46,"value":839},{"type":41,"tag":69,"props":1188,"children":1190},{"className":1189},[],[1191],{"type":46,"value":612},{"type":46,"value":1193}," on every file you created or modified.",{"type":41,"tag":86,"props":1195,"children":1196},{},[],{"type":41,"tag":49,"props":1198,"children":1199},{},[1200],{"type":46,"value":1201},"see: reference\u002Frider-mcp-tools.md — ALL Rider MCP tools: complete parameter reference, execute_tool mode table, UE editor\u002Fasset\u002Fdebugger tools\nsee: reference\u002Frider-tools.md — Test authoring workflow patterns: fix-loop, common lookups, test discovery\nsee: reference\u002Fue-test-patterns.md — Framework patterns (Automation, CQTest, Functional, Gauntlet, LowLevel), new module setup, critical pitfalls",{"type":41,"tag":1203,"props":1204,"children":1205},"style",{},[1206],{"type":46,"value":1207},"html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}",{"items":1209,"total":1340},[1210,1228,1237,1246,1257,1267,1280,1289,1298,1308,1317,1330],{"slug":1211,"name":1211,"fn":1212,"description":1213,"org":1214,"tags":1215,"stars":1225,"repoUrl":1226,"updatedAt":1227},"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},[1216,1219,1222],{"name":1217,"slug":1218,"type":15},"Architecture","architecture",{"name":1220,"slug":1221,"type":15},"Configuration","configuration",{"name":1223,"slug":1224,"type":15},"Engineering","engineering",1650,"https:\u002F\u002Fgithub.com\u002FJetBrains\u002FMPS","2026-07-17T06:06:57.311661",{"slug":1229,"name":1229,"fn":1230,"description":1231,"org":1232,"tags":1233,"stars":1225,"repoUrl":1226,"updatedAt":1236},"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},[1234,1235],{"name":1217,"slug":1218,"type":15},{"name":1223,"slug":1224,"type":15},"2026-07-17T06:04:48.066901",{"slug":1238,"name":1238,"fn":1239,"description":1240,"org":1241,"tags":1242,"stars":1225,"repoUrl":1226,"updatedAt":1245},"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},[1243,1244],{"name":1217,"slug":1218,"type":15},{"name":1223,"slug":1224,"type":15},"2026-07-13T06:45:21.757084",{"slug":1247,"name":1247,"fn":1248,"description":1249,"org":1250,"tags":1251,"stars":1225,"repoUrl":1226,"updatedAt":1256},"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},[1252,1253],{"name":1217,"slug":1218,"type":15},{"name":1254,"slug":1255,"type":15},"Code Analysis","code-analysis","2026-07-23T05:41:33.639365",{"slug":1258,"name":1258,"fn":1259,"description":1260,"org":1261,"tags":1262,"stars":1225,"repoUrl":1226,"updatedAt":1266},"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},[1263],{"name":1264,"slug":1265,"type":15},"Data Analysis","data-analysis","2026-07-13T06:45:19.114674",{"slug":1268,"name":1268,"fn":1269,"description":1270,"org":1271,"tags":1272,"stars":1225,"repoUrl":1226,"updatedAt":1279},"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},[1273,1276],{"name":1274,"slug":1275,"type":15},"Design","design",{"name":1277,"slug":1278,"type":15},"UI Components","ui-components","2026-07-23T05:41:56.638151",{"slug":1281,"name":1281,"fn":1282,"description":1283,"org":1284,"tags":1285,"stars":1225,"repoUrl":1226,"updatedAt":1288},"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},[1286,1287],{"name":1223,"slug":1224,"type":15},{"name":1277,"slug":1278,"type":15},"2026-07-23T05:41:49.666535",{"slug":1290,"name":1290,"fn":1291,"description":1292,"org":1293,"tags":1294,"stars":1225,"repoUrl":1226,"updatedAt":1297},"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},[1295,1296],{"name":1217,"slug":1218,"type":15},{"name":1223,"slug":1224,"type":15},"2026-07-13T06:44:59.507855",{"slug":1299,"name":1299,"fn":1300,"description":1301,"org":1302,"tags":1303,"stars":1225,"repoUrl":1226,"updatedAt":1307},"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},[1304,1305,1306],{"name":1217,"slug":1218,"type":15},{"name":1254,"slug":1255,"type":15},{"name":1223,"slug":1224,"type":15},"2026-07-17T06:06:58.042999",{"slug":1309,"name":1309,"fn":1310,"description":1311,"org":1312,"tags":1313,"stars":1225,"repoUrl":1226,"updatedAt":1316},"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},[1314,1315],{"name":1217,"slug":1218,"type":15},{"name":1223,"slug":1224,"type":15},"2026-07-23T05:41:48.692899",{"slug":1318,"name":1318,"fn":1319,"description":1320,"org":1321,"tags":1322,"stars":1225,"repoUrl":1226,"updatedAt":1329},"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},[1323,1326],{"name":1324,"slug":1325,"type":15},"Debugging","debugging",{"name":1327,"slug":1328,"type":15},"Migration","migration","2026-07-13T06:45:20.372122",{"slug":1331,"name":1331,"fn":1332,"description":1333,"org":1334,"tags":1335,"stars":1225,"repoUrl":1226,"updatedAt":1339},"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},[1336],{"name":1337,"slug":1338,"type":15},"Data Modeling","data-modeling","2026-07-23T05:41:30.705975",188,{"items":1342,"total":1384},[1343,1356,1367,1378],{"slug":1344,"name":1344,"fn":1345,"description":1346,"org":1347,"tags":1348,"stars":22,"repoUrl":23,"updatedAt":1355},"finding-tests","locate C# unit tests in Rider","Locates existing tests for a given C# class and method using the test coverage data supplied by IDE. Triggers ONLY for C# production code (`.cs` files in a Rider .NET solution) when generating new tests, adding test coverage, finding existing tests, or when the user mentions uncovered lines, test files, or test suites. Must be used before writing or editing C# test code when finding already existing tests is necessary. Do NOT invoke for non-C# languages — the underlying tool only understands C# symbols and will not return useful results.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1349,1352,1353,1354],{"name":1350,"slug":1351,"type":15},"C#","csharp",{"name":1324,"slug":1325,"type":15},{"name":1223,"slug":1224,"type":15},{"name":20,"slug":21,"type":15},"2026-07-23T06:05:43.735001",{"slug":1357,"name":1357,"fn":1358,"description":1359,"org":1360,"tags":1361,"stars":22,"repoUrl":23,"updatedAt":1366},"ue-code-authoring","author Unreal Engine C++ code","Use when writing or modifying UE C++ (classes, actors, components, subsystems, interfaces, function libraries) with Rider MCP available. Value over bash\u002Fgrep: IDE diagnostics catch UHT\u002Freflection errors and missing module deps without a full build; lint_files enforces cross-file consistency. DO NOT TRIGGER for: Blueprint-only tasks, editor automation with no C++. When Rider MCP is unavailable, runs in reduced mode — standard file tools only, IDE diagnostics skipped.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1362,1364,1365],{"name":1350,"slug":1363,"type":15},"c",{"name":1324,"slug":1325,"type":15},{"name":1223,"slug":1224,"type":15},"2026-07-13T06:44:21.351871",{"slug":1368,"name":1368,"fn":1369,"description":1370,"org":1371,"tags":1372,"stars":22,"repoUrl":23,"updatedAt":1377},"ue-live-debugging","debug Unreal Engine C++ runtime issues","Use when debugging UE C++ crashes, runtime bugs, or unexpected behavior with Rider MCP available. Value over bash\u002Fgrep: analyze_calls traces C++ call hierarchies (ReSharper backend); get_file_problems surfaces IDE-detected issues; get_symbol_info confirms API contracts; xdebug_set_breakpoint sets live breakpoints; ue_execute_python queries live PIE state. DO NOT TRIGGER for: pure build errors with no runtime component, net-new feature work, Blueprint-only work. When Rider MCP is unavailable, runs in reduced mode — Bash\u002FGrep only, IDE diagnostics skipped.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1373,1374,1375,1376],{"name":1350,"slug":1363,"type":15},{"name":1324,"slug":1325,"type":15},{"name":1223,"slug":1224,"type":15},{"name":13,"slug":14,"type":15},"2026-07-13T06:44:22.938169",{"slug":4,"name":4,"fn":5,"description":6,"org":1379,"tags":1380,"stars":22,"repoUrl":23,"updatedAt":24},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[1381,1382,1383],{"name":17,"slug":18,"type":15},{"name":20,"slug":21,"type":15},{"name":13,"slug":14,"type":15},4]