[{"data":1,"prerenderedAt":472},["ShallowReactive",2],{"navigation_docs":3,"-decisions-0010-the-flagship-assistant-as-blueprint":223,"-decisions-0010-the-flagship-assistant-as-blueprint-surround":467},[4,26,96,105,202],{"title":5,"icon":6,"path":7,"stem":8,"children":9,"page":25},"Getting started","i-lucide-rocket","\u002Fgetting-started","1.getting-started",[10,15,20],{"title":11,"path":12,"stem":13,"icon":14},"Installation","\u002Fgetting-started\u002Finstallation","1.getting-started\u002F1.installation","i-lucide-download",{"title":16,"path":17,"stem":18,"icon":19},"The first app","\u002Fgetting-started\u002Ffirst-app","1.getting-started\u002F2.first-app","i-lucide-play",{"title":21,"path":22,"stem":23,"icon":24},"The first test","\u002Fgetting-started\u002Ffirst-test","1.getting-started\u002F3.first-test","i-lucide-flask-conical",false,{"title":27,"icon":28,"path":29,"stem":30,"children":31,"page":25},"Guide","i-lucide-book-open","\u002Fguide","2.guide",[32,37,42,47,52,57,62,67,72,77,81,86,91],{"title":33,"path":34,"stem":35,"icon":36},"Components","\u002Fguide\u002Fcomponents","2.guide\u002F01.components","i-lucide-component",{"title":38,"path":39,"stem":40,"icon":41},"Inputs and forms","\u002Fguide\u002Finputs-and-forms","2.guide\u002F02.inputs-and-forms","i-lucide-text-cursor-input",{"title":43,"path":44,"stem":45,"icon":46},"Scrolling and viewports","\u002Fguide\u002Fscrolling","2.guide\u002F03.scrolling","i-lucide-scroll-text",{"title":48,"path":49,"stem":50,"icon":51},"Overlays and layers","\u002Fguide\u002Foverlays","2.guide\u002F04.overlays","i-lucide-layers",{"title":53,"path":54,"stem":55,"icon":56},"Styles and theme","\u002Fguide\u002Fstyles","2.guide\u002F05.styles","i-lucide-palette",{"title":58,"path":59,"stem":60,"icon":61},"Composables","\u002Fguide\u002Fcomposables","2.guide\u002F06.composables","i-lucide-puzzle",{"title":63,"path":64,"stem":65,"icon":66},"Widgets","\u002Fguide\u002Fwidgets","2.guide\u002F07.widgets","i-lucide-blocks",{"title":68,"path":69,"stem":70,"icon":71},"The assistant","\u002Fguide\u002Fassistant","2.guide\u002F08.assistant","i-lucide-message-square",{"title":73,"path":74,"stem":75,"icon":76},"The same app on the web","\u002Fguide\u002Fweb","2.guide\u002F09.web","i-lucide-globe",{"title":78,"path":79,"stem":80,"icon":24},"Testing","\u002Fguide\u002Ftesting","2.guide\u002F10.testing",{"title":82,"path":83,"stem":84,"icon":85},"Running and packaging","\u002Fguide\u002Fpackaging","2.guide\u002F11.packaging","i-lucide-package",{"title":87,"path":88,"stem":89,"icon":90},"The terminal contract","\u002Fguide\u002Fterminal","2.guide\u002F12.terminal","i-lucide-square-terminal",{"title":92,"path":93,"stem":94,"icon":95},"Benchmarks","\u002Fguide\u002Fbenchmarks","2.guide\u002F13.benchmarks","i-lucide-gauge",{"title":97,"icon":98,"path":99,"stem":100,"children":101,"page":25},"AI and agents","i-lucide-bot","\u002Fai","3.ai",[102],{"title":97,"path":103,"stem":104,"icon":98},"\u002Fai\u002Fagents","3.ai\u002F1.agents",{"title":106,"icon":107,"path":108,"stem":109,"children":110},"Decisions","i-lucide-scale","\u002Fdecisions","4.decisions",[111,114,118,122,126,130,134,138,142,146,150,154,158,162,166,170,174,178,182,186,190,194,198],{"title":112,"path":108,"stem":113,"icon":46},"All decisions","4.decisions\u002Findex",{"title":115,"path":116,"stem":117},"0001. kyo-ui is the DSL","\u002Fdecisions\u002F0001-kyo-ui-is-the-dsl","4.decisions\u002F0001-kyo-ui-is-the-dsl",{"title":119,"path":120,"stem":121},"0002. jatatui renders the cells","\u002Fdecisions\u002F0002-jatatui-renders-the-cells","4.decisions\u002F0002-jatatui-renders-the-cells",{"title":123,"path":124,"stem":125},"0003. Pin Kyo 1.0.0-RC7 and JDK 25","\u002Fdecisions\u002F0003-pin-kyo-rc7-and-jdk-25","4.decisions\u002F0003-pin-kyo-rc7-and-jdk-25",{"title":127,"path":128,"stem":129},"0004. Public Kyo APIs only","\u002Fdecisions\u002F0004-public-kyo-apis-only","4.decisions\u002F0004-public-kyo-apis-only",{"title":131,"path":132,"stem":133},"0005. A SOFT frame contract and an own watcher loop","\u002Fdecisions\u002F0005-soft-frame-contract-and-own-watcher-loop","4.decisions\u002F0005-soft-frame-contract-and-own-watcher-loop",{"title":135,"path":136,"stem":137},"0006. Purity: edge files, lint and a pure painter","\u002Fdecisions\u002F0006-purity-edge-files-and-lint","4.decisions\u002F0006-purity-edge-files-and-lint",{"title":139,"path":140,"stem":141},"0007. Compiler flags from sbt-tpolecat","\u002Fdecisions\u002F0007-compiler-flags-from-sbt-tpolecat","4.decisions\u002F0007-compiler-flags-from-sbt-tpolecat",{"title":143,"path":144,"stem":145},"0008. The artifact split: runner, app, testkit and core","\u002Fdecisions\u002F0008-artifact-split-runner-app-testkit-core","4.decisions\u002F0008-artifact-split-runner-app-testkit-core",{"title":147,"path":148,"stem":149},"0009. tui4s-use and tui4s-widgets, cross-built","\u002Fdecisions\u002F0009-use-and-widgets-cross-built","4.decisions\u002F0009-use-and-widgets-cross-built",{"title":151,"path":152,"stem":153},"0010. The flagship assistant is the blueprint of a real app","\u002Fdecisions\u002F0010-the-flagship-assistant-as-blueprint","4.decisions\u002F0010-the-flagship-assistant-as-blueprint",{"title":155,"path":156,"stem":157},"0011. The web target: a standalone Scala.js app and one theme","\u002Fdecisions\u002F0011-web-target-standalone-scalajs-and-one-theme","4.decisions\u002F0011-web-target-standalone-scalajs-and-one-theme",{"title":159,"path":160,"stem":161},"0012. The documentation is example-first","\u002Fdecisions\u002F0012-documentation-is-example-first","4.decisions\u002F0012-documentation-is-example-first",{"title":163,"path":164,"stem":165},"0013. Benchmarks in the repository, with their own build","\u002Fdecisions\u002F0013-benchmarks-in-repo-with-own-build","4.decisions\u002F0013-benchmarks-in-repo-with-own-build",{"title":167,"path":168,"stem":169},"0014. Release per module, by tag, as 0.1.0-RC1","\u002Fdecisions\u002F0014-release-per-module-tags-and-rc1","4.decisions\u002F0014-release-per-module-tags-and-rc1",{"title":171,"path":172,"stem":173},"0015. Packaging: the AOT cache in the start scripts, native-image as an option","\u002Fdecisions\u002F0015-packaging-aot-cache-and-native-image","4.decisions\u002F0015-packaging-aot-cache-and-native-image",{"title":175,"path":176,"stem":177},"0016. Process: lean mode and agent roles","\u002Fdecisions\u002F0016-process-lean-mode-and-agent-roles","4.decisions\u002F0016-process-lean-mode-and-agent-roles",{"title":179,"path":180,"stem":181},"0017. Deferred: templates, mouse, the kitty keyboard protocol and Windows","\u002Fdecisions\u002F0017-deferred-templates-mouse-and-kitty","4.decisions\u002F0017-deferred-templates-mouse-and-kitty",{"title":183,"path":184,"stem":185},"0018. pini4s is a vendored Git submodule","\u002Fdecisions\u002F0018-pini4s-as-a-vendored-submodule","4.decisions\u002F0018-pini4s-as-a-vendored-submodule",{"title":187,"path":188,"stem":189},"0019. Upstream issues are drafts that the user posts","\u002Fdecisions\u002F0019-upstream-kyo-issues-as-drafts","4.decisions\u002F0019-upstream-kyo-issues-as-drafts",{"title":191,"path":192,"stem":193},"0020. Release from the Actions form","\u002Fdecisions\u002F0020-release-from-the-actions-form","4.decisions\u002F0020-release-from-the-actions-form",{"title":195,"path":196,"stem":197},"0021. The rulebook is CONTRIBUTING.md","\u002Fdecisions\u002F0021-the-rulebook-is-contributing-md","4.decisions\u002F0021-the-rulebook-is-contributing-md",{"title":199,"path":200,"stem":201},"0022. The logo is text","\u002Fdecisions\u002F0022-the-logo-is-text","4.decisions\u002F0022-the-logo-is-text",{"title":203,"icon":204,"path":205,"stem":206,"children":207,"page":25},"Project","i-lucide-compass","\u002Fproject","5.project",[208,213,218],{"title":209,"path":210,"stem":211,"icon":212},"Roadmap","\u002Fproject\u002Froadmap","5.project\u002F1.roadmap","i-lucide-map",{"title":214,"path":215,"stem":216,"icon":217},"Contributing","\u002Fproject\u002Fcontributing","5.project\u002F2.contributing","i-lucide-git-pull-request",{"title":219,"path":220,"stem":221,"icon":222},"Security","\u002Fproject\u002Fsecurity","5.project\u002F3.security","i-lucide-shield",{"id":224,"title":151,"body":225,"description":460,"extension":461,"links":462,"meta":463,"navigation":464,"path":152,"seo":465,"stem":153,"__hash__":466},"docs\u002F4.decisions\u002F0010-the-flagship-assistant-as-blueprint.md",{"type":226,"value":227,"toc":449},"minimark",[228,233,237,241,244,248,273,277,357,361,394,398,434,438],[229,230,232],"h2",{"id":231},"status","Status",[234,235,236],"p",{},"Accepted",[229,238,240],{"id":239},"date","Date",[234,242,243],{},"2026-10-17 (D3, D4). Landed on 2026-10-19 (L3).",[229,245,247],{"id":246},"context","Context",[249,250,251,255,267,270],"ul",{},[252,253,254],"li",{},"The user asked for \"a large example that shows how to structure a real application\" and for \"a chat bot that can use ChatGPT or Anthropic (API key, or a subscription if it is permitted)\".",[252,256,257,258,262,263,266],{},"Provider rules (research of 2026-10-17): an API key is permitted for both. A claude.ai login or token reuse in a third-party app is forbidden. Driving the user's own ",[259,260,261],"code",{},"claude -p"," is gray, and without ",[259,264,265],{},"--bare"," it runs the project's hooks and MCP servers. OpenAI \"Sign in with ChatGPT\" for open-source apps was a preview (search summaries only).",[252,268,269],{},"The official Java SDKs are 39 MB and 69 MB core jars plus Kotlin, Jackson and OkHttp. kyo-http RC7 can stream SSE on a POST and is already on the classpath through kyo-ui.",[252,271,272],{},"A tui4s handler runs on the runner fiber. A handler that waits for the network freezes input, so actions that wait must fork.",[229,274,276],{"id":275},"decision","Decision",[249,278,279,294,305,312,336,343,346],{},[252,280,281,282,285,286,289,290,293],{},"One flagship app: the assistant (",[259,283,284],{},"modules\u002Fassistant",", main ",[259,287,288],{},"examples.assistant.AssistantApp",", ",[259,291,292],{},"--fake"," for no network).",[252,295,296,297,304],{},"Providers: Anthropic and OpenAI with the user's API key, and a scripted fake provider. Codex app-server is second (not built; ",[298,299,303],"a",{"href":300,"rel":301},"https:\u002F\u002Fgithub.com\u002Fyuri4n\u002Ftui4s\u002Fissues\u002F48",[302],"nofollow","#48","). A Claude Code CLI backend is never in published code.",[252,306,307,308,311],{},"Keys come from environment variables or a file with mode 0600 (",[259,309,310],{},"SecretsJvm","), never from a login token.",[252,313,314,315,289,318,289,321,289,324,327,328,331,332,335],{},"The shape is the blueprint for a new app: a pure domain with laws (the transcript fold, the title rule, the SSE split, the codec round trip); services as traits (",[259,316,317],{},"ChatProvider",[259,319,320],{},"Secrets",[259,322,323],{},"ConversationStore",[259,325,326],{},"AppLog",") with their interpreters in a ",[259,329,330],{},"make"," (JVM, browser, in memory for tests); one store for the app; the wiring with Kyo layers in the main; errors as values (",[259,333,334],{},"Abort"," with a sealed error type).",[252,337,338,339,342],{},"The HTTP seam (",[259,340,341],{},"KyoHttp",") follows no redirect and has a 5-minute idle limit. The review found that a redirect carried the key to the new host.",[252,344,345],{},"Thin SSE wires over kyo-http, no vendor SDK.",[252,347,348,349,352,353,356],{},"The app opts in to the Anthropic server-side fallbacks for its default model (header ",[259,350,351],{},"anthropic-beta: server-side-fallback-2026-07-01",", field ",[259,354,355],{},"fallbacks: \"default\"","). The user must know this.",[229,358,360],{"id":359},"alternatives-considered","Alternatives considered",[249,362,363,370,376,382,388],{},[252,364,365,369],{},[366,367,368],"strong",{},"Several small apps."," Not chosen: the user asked for one large example. The small examples (counter, todo, dashboard, forms, gallery) stay for single features.",[252,371,372,375],{},[366,373,374],{},"A chat bot in the docs only."," Not recorded.",[252,377,378,381],{},[366,379,380],{},"The official provider SDKs."," Rejected for their size and their dependencies.",[252,383,384,387],{},[366,385,386],{},"A subscription login."," Rejected: forbidden for Anthropic; unverified terms for OpenAI.",[252,389,390,393],{},[366,391,392],{},"A Claude Code CLI backend."," Rejected for published code: a gray area under the provider rules, and a child process runs the hooks and MCP servers of the folder.",[229,395,397],{"id":396},"consequences","Consequences",[249,399,400,403,406,419,422],{},[252,401,402],{},"Good: the assistant is the reference for CONTRIBUTING.md (\"Follow it for a new app\") and for the docs. ",[252,404,405],{},"Good: in-memory interpreters make 13 headless tests and 86 module tests possible with no network.",[252,407,408,409,412,413,418],{},"Bad: the server-side fallbacks change which model answers when a safety rule declines. This is an opt-in in ",[259,410,411],{},"Wires.scala","; it needs a line in the docs (",[298,414,417],{"href":415,"rel":416},"https:\u002F\u002Fgithub.com\u002Fyuri4n\u002Ftui4s\u002Fissues\u002F35",[302],"#35",").",[252,420,421],{},"Bad: the OpenAI default model id is unchecked data; effort and thinking are not sent; the run log file has the umask mode.",[252,423,424,425,428,429,418],{},"Bad: ",[259,426,427],{},"Surface"," mixes data and the key-vault capability (a deferred review finding, ",[298,430,433],{"href":431,"rel":432},"https:\u002F\u002Fgithub.com\u002Fyuri4n\u002Ftui4s\u002Fissues\u002F36",[302],"#36",[229,435,437],{"id":436},"references","References",[249,439,440,443,446],{},[252,441,442],{},"Roadmap: 2.5, 2.6 (the handler trap), D3, D4. Handoff: L3 (\"USER MUST KNOW\").",[252,444,445],{},"CONTRIBUTING.md: \"UI architecture and API design\" (the assistant item). ",[252,447,448],{},"README: \"A real app: the assistant\".",{"title":450,"searchDepth":451,"depth":451,"links":452},"",2,[453,454,455,456,457,458,459],{"id":231,"depth":451,"text":232},{"id":239,"depth":451,"text":240},{"id":246,"depth":451,"text":247},{"id":275,"depth":451,"text":276},{"id":359,"depth":451,"text":360},{"id":396,"depth":451,"text":397},{"id":436,"depth":451,"text":437},"One flagship example, an AI chat assistant, shows how to structure a real tui4s app: a pure domain, services as traits with interpreters, one store, Kyo layers and errors as values.","md",null,{},true,{"title":151,"description":460},"lLb4uVNOpDYVveVlL2bAWZEh_G4wnSZwdBr26sZbRDY",[468,470],{"title":147,"path":148,"stem":149,"description":469,"children":-1},"Composables (tui4s-use) and widgets (tui4s-widgets) are published modules of this repository, plain kyo-ui code for the JVM and Scala.js, with no dependency on tui4s-core.",{"title":155,"path":156,"stem":157,"description":471,"children":-1},"The web build of the assistant is a static Scala.js app from the shared module, with no server and no link to the terminal app; one Theme value renders both looks to one Stylesheet.",1792528756703]