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Check Current Changes\n\nFirst, see what's changed:\n\n```bash\ngit status\ngit diff                    # Unstaged changes\ngit diff --staged           # Staged changes\ngit diff main...HEAD        # All changes on current branch\n```\n\n### 2. Understand Changed Code Context\n\nFor each significantly changed file, use semantic search to understand:\n\n- **Similar patterns**: Find similar code elsewhere that might need the same change\n- **Callers**: Find code that calls the modified functions\n- **Dependencies**: Find code that the modified code depends on\n\n```bash\n# Find similar patterns\njbcontext search \"\u003Ccode chunk that was changed>\"\n\n# Find callers of a modified function\njbcontext search \"calls to \u003Cfunction name> to understand impact\"\n\n# Find related test files in the \"test\u002F\" directory (path must be relative to the project root)\njbcontext search -p test \"tests for \u003Cfeature being modified>\"\n```\n\n### 3. Review Checklist\n\nFor each change, verify:\n\n- [ ] The change is consistent with similar patterns in the codebase\n- [ ] All callers of modified functions will still work correctly\n- [ ] Related tests exist and cover the changes\n- [ ] The change doesn't reintroduce previously fixed bugs\n\n## Example Session\n\n```bash\n# See what's changed\ngit diff --staged\n\n# For a change to auth middleware, find similar patterns\njbcontext search \"authentication middleware pattern\"\n\n# Find what calls this middleware\njbcontext search \"uses auth middleware to protect routes\"\n\n# Find related tests\njbcontext search -p test \"auth middleware test\"\n```\n",{"data":34,"body":35},{"name":4,"description":6},{"type":36,"children":37},"root",[38,47,67,73,80,86,178,184,189,223,361,367,372,416,422,581],{"type":39,"tag":40,"props":41,"children":43},"element","h2",{"id":42},"when-to-use",[44],{"type":45,"value":46},"text","When to Use",{"type":39,"tag":48,"props":49,"children":50},"ul",{},[51,57,62],{"type":39,"tag":52,"props":53,"children":54},"li",{},[55],{"type":45,"value":56},"Before committing changes to understand what you're about to commit",{"type":39,"tag":52,"props":58,"children":59},{},[60],{"type":45,"value":61},"Reviewing pull requests or branches",{"type":39,"tag":52,"props":63,"children":64},{},[65],{"type":45,"value":66},"Understanding the impact of changes on the rest of the codebase",{"type":39,"tag":40,"props":68,"children":70},{"id":69},"review-workflow",[71],{"type":45,"value":72},"Review Workflow",{"type":39,"tag":74,"props":75,"children":77},"h3",{"id":76},"_1-check-current-changes",[78],{"type":45,"value":79},"1. 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Reach for this skill whenever the task involves authoring or modifying `\u003Clang>\u002FlanguageModels\u002Fconstraints.mps`.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[629,630],{"name":596,"slug":597,"type":15},{"name":20,"slug":21,"type":15},"2026-07-23T05:41:33.639365",{"slug":633,"name":633,"fn":634,"description":635,"org":636,"tags":637,"stars":602,"repoUrl":603,"updatedAt":641},"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},[638],{"name":639,"slug":640,"type":15},"Data Analysis","data-analysis","2026-07-13T06:45:19.114674",{"slug":643,"name":643,"fn":644,"description":645,"org":646,"tags":647,"stars":602,"repoUrl":603,"updatedAt":654},"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},[648,651],{"name":649,"slug":650,"type":15},"Design","design",{"name":652,"slug":653,"type":15},"UI Components","ui-components","2026-07-23T05:41:56.638151",{"slug":656,"name":656,"fn":657,"description":658,"org":659,"tags":660,"stars":602,"repoUrl":603,"updatedAt":663},"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},[661,662],{"name":17,"slug":18,"type":15},{"name":652,"slug":653,"type":15},"2026-07-23T05:41:49.666535",{"slug":665,"name":665,"fn":666,"description":667,"org":668,"tags":669,"stars":602,"repoUrl":603,"updatedAt":672},"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},[670,671],{"name":596,"slug":597,"type":15},{"name":17,"slug":18,"type":15},"2026-07-13T06:44:59.507855",{"slug":674,"name":674,"fn":675,"description":676,"org":677,"tags":678,"stars":602,"repoUrl":603,"updatedAt":682},"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},[679,680,681],{"name":596,"slug":597,"type":15},{"name":20,"slug":21,"type":15},{"name":17,"slug":18,"type":15},"2026-07-17T06:06:58.042999",{"slug":684,"name":684,"fn":685,"description":686,"org":687,"tags":688,"stars":602,"repoUrl":603,"updatedAt":691},"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},[689,690],{"name":596,"slug":597,"type":15},{"name":17,"slug":18,"type":15},"2026-07-23T05:41:48.692899",{"slug":693,"name":693,"fn":694,"description":695,"org":696,"tags":697,"stars":602,"repoUrl":603,"updatedAt":704},"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},[698,701],{"name":699,"slug":700,"type":15},"Debugging","debugging",{"name":702,"slug":703,"type":15},"Migration","migration","2026-07-13T06:45:20.372122",{"slug":706,"name":706,"fn":707,"description":708,"org":709,"tags":710,"stars":602,"repoUrl":603,"updatedAt":714},"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},[711],{"name":712,"slug":713,"type":15},"Data Modeling","data-modeling","2026-07-23T05:41:30.705975",188,{"items":717,"total":319},[718,728,742,751,757,767,777],{"slug":719,"name":719,"fn":720,"description":721,"org":722,"tags":723,"stars":22,"repoUrl":23,"updatedAt":727},"blast-radius","analyze blast radius of code changes","Experimental jbcontext org-wide blast-radius analysis across multiple repositories. Use when Codex needs to estimate the impact of changing an API, endpoint, schema, event, shared library, config, feature flag, data model, behavior, or dependency by finding producers, consumers, owners, tests, and related repos.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[724,725,726],{"name":596,"slug":597,"type":15},{"name":20,"slug":21,"type":15},{"name":17,"slug":18,"type":15},"2026-07-13T06:43:52.366136",{"slug":729,"name":729,"fn":730,"description":731,"org":732,"tags":733,"stars":22,"repoUrl":23,"updatedAt":741},"context-install","install and configure jbcontext","Install jbcontext and complete first-time setup — login and configure agent integration. Use when `jbcontext` is not found or the user asks to install jbcontext.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[734,737,738],{"name":735,"slug":736,"type":15},"CLI","cli",{"name":17,"slug":18,"type":15},{"name":739,"slug":740,"type":15},"Onboarding","onboarding","2026-07-13T06:43:56.417787",{"slug":743,"name":743,"fn":744,"description":745,"org":746,"tags":747,"stars":22,"repoUrl":23,"updatedAt":750},"context-research","research unfamiliar codebases using semantic search","Research and understand unfamiliar codebases using semantic search with `jbcontext search`",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[748,749],{"name":20,"slug":21,"type":15},{"name":13,"slug":14,"type":15},"2026-07-17T06:06:53.804135",{"slug":4,"name":4,"fn":5,"description":6,"org":752,"tags":753,"stars":22,"repoUrl":23,"updatedAt":24},{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[754,755,756],{"name":20,"slug":21,"type":15},{"name":17,"slug":18,"type":15},{"name":13,"slug":14,"type":15},{"slug":758,"name":758,"fn":759,"description":760,"org":761,"tags":762,"stars":22,"repoUrl":23,"updatedAt":766},"context-search","explore codebases using semantic search","Semantic code search for discovering and understanding code by meaning rather than keywords.\n- Use this skill when you need to find code whose location you don't already know - e.g., when the task asks 'where is X', 'how does Y work', or describes behavior or intent without naming exact symbols.\n- When not to use: if you already know the relevant file, class, or symbol (use direct navigation or keyword search instead), or for non-code-discovery tasks such as git operations, builds, tests, or reviewing an existing diff.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[763,764,765],{"name":20,"slug":21,"type":15},{"name":17,"slug":18,"type":15},{"name":13,"slug":14,"type":15},"2026-07-30T05:28:03.252026",{"slug":768,"name":768,"fn":769,"description":770,"org":771,"tags":772,"stars":22,"repoUrl":23,"updatedAt":776},"dependency-search","search dependencies across repositories","Experimental jbcontext org-wide dependency search across multiple repositories. Use when need to find APIs in other repositories, or dependency configuration are used across repos for upgrades, removals, CVEs, migrations, or ownership discovery.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[773,774,775],{"name":20,"slug":21,"type":15},{"name":17,"slug":18,"type":15},{"name":13,"slug":14,"type":15},"2026-07-13T06:44:02.819425",{"slug":778,"name":778,"fn":779,"description":780,"org":781,"tags":782,"stars":22,"repoUrl":23,"updatedAt":785},"org-search","perform org-wide semantic code search","Experimental jbcontext org-wide semantic search across multiple repositories",{"slug":8,"name":9,"logoUrl":10,"githubOrg":9},[783,784],{"name":20,"slug":21,"type":15},{"name":13,"slug":14,"type":15},"2026-07-17T06:04:43.196869"]