feat(appkit-ui): add chat building blocks (provider, hooks, headless components)#364

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hubertzub-db wants to merge 46 commits intodatabricks:mainfrom

hubertzub-db:agent/v2/chatui/2-building-blocks

Commits on May 7, 2026

feat(appkit): agents() plugin, createAgent(def), and markdown-driven agents
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refactor(appkit): generalize default base system prompt
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feat(appkit): optional serving_endpoint on agents plugin manifest
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fix(appkit): agents manifest uses DATABRICKS_AGENT_ENDPOINT
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feat(agents): folder-based markdown discovery (<id>/agent.md)
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refactor(appkit): promote MCP client + host policy to connectors/mcp
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refactor(appkit): extract normalizeToolResult, consumeAdapterStream, dispatchToolCall
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fix(agents): propagate tool annotations through tool() → FunctionTool → def
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feat(agents): semantic ToolEffect — write/update/destructive tiers
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feat(appkit): fromPlugin() DX, runAgent plugins arg, shared toolkit-resolver
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refactor(appkit): use consumeAdapterStream in core/run-agent
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fix(agents): update agents.ts imports to core/agent/ paths after Option A rewrite
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feat(appkit): sub-agent approval gate and HttpToolExecutor path (SDK)
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fix(appkit): forward all sub-agent events except metadata (SDK)
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refactor(appkit): move agent runtime to core/agent/
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refactor(appkit): extract AgentRunner + ToolExecutor strategy
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refactor(appkit): split agents.ts helpers into separate modules
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feat(appkit): unify on DATABRICKS_SERVING_ENDPOINT_NAME (SDK + template manifest)
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feat(appkit): reference agent-app, dev-playground chat UI, docs, and template
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fix(appkit): align chat clients + template with renamed 'agents' plugin
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docs(agents): folder layout on disk, migrate samples, sync API refs
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docs(appkit): regenerate typedoc API reference for folder-agents loader
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feat(dev-playground): port Smart Dashboard as /smart-dashboard route; retire agent-app
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feat(dev-playground): stage 2-4 of smart-dashboard demo
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feat(appkit): sub-agent approval gate + save view to volume + saved views panel + floating chat
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fix(playground): treat missing saved-views dir as empty list, not 500
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fix(appkit): forward all sub-agent events except metadata
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fix(playground): use html2canvas-pro to support oklch() colors
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fix(playground): unwrap DownloadResponse when serving saved-view PNGs
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fix(playground): apply saved view directly from metadata on thumbnail click
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docs(appkit): regenerate typedoc for tool annotations
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feat(playground): revamp smart dashboard with denser charts and actionable agent feed
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feat(playground): hamburger nav with shared catalog and redesigned home
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feat(playground): tiered approval card — writes vs updates vs destructive
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fix(playground): pin agent-feed card tints to sRGB hex
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fix(playground): gate Tailwind dark: variant on the theme class
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fix(playground): stop streaming chat bubbles from pulsing
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chore(playground): migrate dev-playground server to onPluginsReady
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feat(template): scaffold a working starter agent
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fix(playground, template): import agents from @databricks/appkit/beta
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docs: beta agents banner, template stability, and unified typedoc entry
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chore: remove plans scratch docs from agents stack branch
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chore(appkit): Biome format load-agents imports
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chore(appkit): regenerate typedoc and sync lockfile after rebase
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feat(appkit): add Vercel AI SDK UI Message Stream protocol to agents plugin
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feat(appkit-ui): add chat building blocks (provider, hooks, headless components)
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