chore: release 0.4.0

[ochafik]

Release 0.4.0

Features

• ui/update-model-context: New protocol method for guests to update their model context dynamically (feat: add ui/update-model-context #125)
• Enhanced sandbox capability negotiation: Improved CSP configuration with frameDomains, baseUriDomains, and Permission Policy support (feat: enhance sandbox capability negotiation #158)
• structuredContent with outputSchema: Example servers now use structured tool output (feat: use structuredContent with outputSchema in example servers #220)
• Collapsible panels in basic-host: Improved host UI with collapsible sections and SDK types (feat(basic-host): improve host UI with collapsible panels and SDK types #244)
• Dev mode with auto-restart: npm start now runs in dev mode with --watch for auto-restart (feat(examples): add --watch to bun serve commands for auto-restart, and have npm start hit dev mode of all examples #246)

New Examples

• transcript-server: Live speech transcription example (examples: add transcript-server example with live speech transcription #240)
• map-server: CesiumJS Map App with 3D globe visualization (examples: Add CesiumJS Map App example #235)
• shadertoy-server: WebGL shader rendering example (Add shadertoy-server example for WebGL shader rendering #226)

Fixes

• Proper CSP handling in basic-host sandboxing via HTTP headers (fix: proper CSP handling in basic-host sandboxing (HTTP headers, worker-src, document.write) #234)
• Align CSP sample with resourceDomains spec (fix: align CSP sample with resourceDomains spec #233)
• Error handling for server startup failures (fix: add error handling for server startup failures #236)
• Update qr-server SDK to 0.3.1 (fix(qr-server): Update SDK to 0.3.1 with app-with-deps bundle #247)

Other

• Add AGENTS.md and CLAUDE.md for AI assistant guidance (Add {AGENTS,CLAUDE}.md for AI assistant guidance #218)
• Replace deprecated RESOURCE_URI_META_KEY with _meta.ui.resourceUri (Replace deprecated RESOURCE_URI_META_KEY with _meta.ui.resourceUri #217)
• Restore educational comments in basic-server examples (Restore educational comments in basic-server-* examples #228)
• Add missing refresh-stats tool to system-monitor-server (Add missing refresh-stats tool to system-monitor-server #227)

[pkg-pr-new]

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@modelcontextprotocol/ext-apps

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@modelcontextprotocol/server-basic-react

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@modelcontextprotocol/server-basic-vanillajs

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@modelcontextprotocol/server-budget-allocator

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@modelcontextprotocol/server-cohort-heatmap

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@modelcontextprotocol/server-customer-segmentation

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@modelcontextprotocol/server-scenario-modeler

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@modelcontextprotocol/server-system-monitor

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@modelcontextprotocol/server-threejs

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@modelcontextprotocol/server-wiki-explorer

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commit: 4beb785

[ochafik]

Note: this one isn't published to npm so all good to downgrade