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This PR is a preview of the release that release-plan has prepared. To release you should just merge this PR 👍

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Release (2026-10-21)

• carbon-components-ember 4.0.0 (major)
• carbon-components-ember-mcp 0.1.0 (minor)

💥 Breaking Change

• carbon-components-ember
  • #1168 feat!: take clicks as {{on "click"}} on CopyButton, OverflowMenuItem, Tile and FileUploaderDropContainer (@aklkv)
  • #1153 feat!: give OverflowMenu Carbon React's API, on our floating engine (@aklkv)
  • #1159 feat!: give Button Carbon React's API (@aklkv)
  • #1156 feat!: render icons bare, like @carbon/icons-react (@aklkv)
  • #1144 feat!: make Modal a native <dialog> with Carbon React's API (@aklkv)
  • #1143 feat!: give Breadcrumb Carbon React's BreadcrumbItem (@aklkv)
  • #1138 feat!: make Select a native <select>, as in Carbon React (@aklkv)
  • #1142 fix(time-picker-select)!: select its value on the first render (@aklkv)
  • #1096 feat!: split Notification into Carbon React's notification components (@aklkv)
  • #1017 refactor: colocate component styles and ship one compiled styles.css (@aklkv)
  • #1011 fix: apply component styles CSP-safely, and test under a strict CSP (@aklkv)
  • #991 refactor: give the charts their own barrel, with charts-react's names (@aklkv)
  • #990 refactor: stop re-exporting components into the app tree (@aklkv)
  • #988 refactor: name each component's file after its export, with a barrel for AI Chat (@aklkv)
  • #987 refactor: give FlexGrid its own module and Grid's parts React's names (@aklkv)
  • #974 feat: add InlineLoading, and match Loading to Carbon React's (@aklkv)
  • #954 feat: add AILabel and a decorator block on its hosts (@aklkv)
  • #949 Clean up component signatures and forward ...attributes on every component (@aklkv)
  • #932 refactor: use Ember 7's built-in helpers instead of addon helpers (@aklkv)

🚀 Enhancement

• carbon-components-ember
  • #1167 feat: let BreadcrumbItem yield an OverflowMenu set up for a breadcrumb (@aklkv)
  • #1161 feat: give CodeSnippet Carbon React's row limits (@aklkv)
  • #1136 feat: add MultiSelect and FilterableMultiSelect, built on the ListBox parts (@aklkv)
  • #1134 feat: add ComboBox, built on the ListBox parts (@aklkv)
  • #1135 feat: let settled() wait for lazily loaded icons (@aklkv)
  • #1111 refactor: drop ember-primitives, showing OverflowMenu's tooltip with Tooltip (@aklkv)
  • #1109 feat(tooltip, toggletip): render through Popover, with floating auto-align (@aklkv)
  • #1122 feat: add the ListBox parts, and build Dropdown on them (@aklkv)
  • #1127 perf: declare sideEffects so barrel imports tree-shake (@aklkv)
  • #1097 feat(popover): position @autoalign popovers with Floating UI in the top layer (@aklkv)
  • #1114 feat: add a copyToClipboard modifier, and copy through it (@aklkv)
  • #1117 feat(tabs): move between tabs with RovingFocus, keeping the tab stop on the selected tab (@aklkv)
  • #1115 feat: add a RovingFocus primitive, and keyboard navigation for TreeView (@aklkv)
  • #955 feat: add Carbon React's skeleton components (@aklkv)
  • #968 feat: AI labels on TextInput, NumberInput, Checkbox and RadioButton (@aklkv)
  • #974 feat: add InlineLoading, and match Loading to Carbon React's (@aklkv)
  • #954 feat: add AILabel and a decorator block on its hosts (@aklkv)
  • #879 Carbon AI Chat: ChatSessionService persistence + chat-history integration (@patricklx)
  • #880 Carbon AI Chat: multi-instance isolation for ChatSessionService (NamespaceService) (@patricklx)
  • #876 Carbon AI Chat: port AudioPlayer and VideoPlayer components (@patricklx)
  • #878 AI Chat: streaming cancellation for ChatSessionService (@patricklx)
  • #877 Carbon AI Chat orchestration layer: carbon.ai-chat-session service + SessionShell (@patricklx)
  • #870 Carbon AI Chat: port chat-history component family (@patricklx)
  • #865 Carbon AI Chat batch 3: Processing, ChatButton, Toolbar, WorkspaceShell, FileUploads (@patricklx)
  • #868 PromptLine: add the real suggestion popup (PromptLineAutocomplete) (@patricklx)
  • #866 Add mention/command/autocomplete/starter Tiptap extensions to PromptLine (@patricklx)
  • #864 PromptLine: IME composition guard + Tiptap preload fast path (@patricklx)
  • #863 feat: add rich (Tiptap) editing mode to PromptLine (@patricklx)
  • #862 feat: port Carbon AI Chat ChainOfThought, ReasoningSteps, Feedback, PromptLine components (@patricklx)
  • #861 feat: port Carbon AI Chat Markdown component (@patricklx)
  • #859 feat: port Carbon AI Chat Carousel component (@patricklx)
  • #791 feat: implement Resizer component (@patricklx)
  • #838 feat: port Carbon AI Chat Launcher and ChatShell components (@patricklx)
• carbon-components-ember-mcp, carbon-components-ember
  • #1150 feat(skill): name reference pages after their components, and validate skills in CI (@aklkv)
  • #986 feat: ship an agent skill with the addon (@aklkv)
  • #971 feat(mcp): give apps' agents instructions for using the components (@aklkv)
  • #957 feat: add carbon-components-ember-mcp, an MCP server for consumers (@aklkv)

🐛 Bug Fix

• carbon-components-ember
  • #1162 fix: apply defaults where each argument is read (@aklkv)
  • #1141 fix(pagination): bring the page back within range when @Length shrinks (@aklkv)
  • #1098 fix: keep Popover and Toggletip open after a drag that ends outside (@aklkv)
  • #1016 fix(code-snippet): give CodeMirror's styles the page's CSP nonce (@aklkv)
  • #1013 fix(resizer): measure the siblings' initial sizes after they render (@aklkv)
  • #969 fix: OverflowMenu placement, and the DataTable row menu (@aklkv)
  • #970 fix(ai-chat): card footer buttons fill the footer (@aklkv)
  • #975 fix(button): let a type="submit" Button submit its form (@aklkv)
  • #942 fix: update the app re-export map for the chart parts (@aklkv)
  • #934 fix(charts): derive chart state from its parts instead of render side effects (@aklkv)
  • #933 fix(data-table): make expandable rows expand (@aklkv)
  • #924 fix: component bugs found by the Storybook port (@aklkv)
  • #881 fix: chat-history overflow-menu icon alignment + New chat button color (@patricklx)

📝 Documentation

• carbon-components-ember
  • #1151 docs: point references to the moved AGENTS.md sections at the skills (@aklkv)

🏠 Internal

• Other
  • #1148 chore(deps): keep markdown-it on ai-chat-components' major, and label Dependabot's PRs (@aklkv)
  • #1058 chore: add issue forms, a pull request template and a track-work skill (@aklkv)
  • #1007 chore: use pnpm 12.11.2 (@aklkv)
  • #956 chore(parity): compare stories with Carbon React's (@aklkv)
  • #973 chore(parity): compare each component's arguments with React's props (@aklkv)
  • #945 chore: only run the build scripts we need (@aklkv)
  • #941 fix(storybook): show each story's own code in "Show code" (@aklkv)
  • #943 ci: remove a PR's docs preview whenever the PR closes (@aklkv)
  • #890 docs: record dom-parity coverage inventory, schedule follow-up todos (@patricklx)
  • #887 test: add DOM-parity harness comparing Ember components against @carbon/react (@patricklx)
  • #885 fix: root-cause 3 CI-flaky test-app timing races (@patricklx)
  • #882 fix(docs-app): resolve .module.scss?inline imports before embroider-resolver drops the query (@patricklx)
  • #869 fix: docs-app default 'white' theme never got real custom-property injection (@patricklx)
• carbon-components-ember
  • #1147 test(dom-parity): ignore whitespace in path data, and accept deliberate arg differences (@aklkv)
  • #1119 perf: share one ResizeObserver, delivering in the next frame (@aklkv)
  • #1121 refactor: defer work past the render with afterRender instead of ember-lifeline (@aklkv)
  • #1112 chore: import ember-modifier's modifier under its own name (@aklkv)
  • #1095 chore: lint stylesheets with Stylelint (@aklkv)
  • #1074 chore: patch Vite's dependency optimizer to hash scanned deps once (@aklkv)
  • #1089 chore: drop the classic compat build and ember-strict-application-resolver (@aklkv)
  • #1080 refactor: import icons from their own modules inside the addon (@aklkv)
  • #1015 test: run the stories under a strict CSP (@aklkv)
  • #1012 ci(stories): log requests that fail or are cut off (@aklkv)
  • #992 chore: split create-files.mjs into icons.mjs and barrels.mjs, as pnpm generate (@aklkv)
  • #1009 test: fix the flaky IconIndicator and VideoPlayer stories (@aklkv)
  • #972 chore: pin Carbon and TypeScript in pnpm catalogs, upgraded by hand (@aklkv)
  • #952 docs(storybook): match Carbon React's story pages, names and Layer variants (@aklkv)
  • #951 feat(storybook): serve the component docs to AI agents over MCP (@aklkv)
  • #953 docs: rewrite the README and finish the Storybook intro (@aklkv)
  • #950 chore: upgrade Octokit, jsdom, rollup, Babel and eslint-plugin-ember (@aklkv)
  • #946 chore: workspace tooling for scripts and dom-parity, patch bumps and CI change detection (@aklkv)
  • #940 chore: ESLint 10, Babel 8, and template linting through ESLint (@aklkv)
  • #937 test: load Carbon's styles once instead of inlining them per test (@aklkv)
  • #936 chore: replace ember-resources cells with tracked() values (@aklkv)
  • #925 chore: retire docs-app; Storybook is the docs site (@aklkv)
  • #923 feat: Storybook with every docs-app page ported (ember-storybook) (@aklkv)
  • #921 chore: prune pnpm overrides and fix audit advisories (@aklkv)
  • #919 chore: migrate to @ember/addon-blueprint and power-select 9 (@aklkv)
  • #899 test: expand DOM-parity coverage to Accordion, Tabs/TabContent and StructuredList (@patricklx)
  • #898 test: expand DOM-parity coverage to the indicator/progress family (@patricklx)
  • #911 fix(icon): render Carbon's real svg root attributes for every icon (@patricklx)
  • #895 test: expand DOM-parity coverage to static form controls (@patricklx)
  • #894 test: expand DOM-parity coverage to the skeleton family (@patricklx)
  • #889 fix: rework Tile selectable/expandable DOM shape, close dom-parity gaps (@patricklx)
  • #888 test: expand DOM-parity coverage and fix gaps it surfaced (@patricklx)
  • #883 fix: resolve or remove the 4 dead astroturf rules left by the .module.scss?inline fix (@patricklx)
• carbon-components-ember-mcp, carbon-components-ember
  • #1093 chore: upgrade ember-source, Storybook, Vitest, Playwright and other patches (@aklkv)

Committers: 2

• Alexey Kulakov (@aklkv)
• Patrick Pircher (@patricklx)