* feat(basic-host): add theme toggle and MCP style variables
Add theme support to basic-host example:
- theme.ts: Global theme manager with light/dark toggle
- host-styles.ts: Full set of MCP CSS variables using light-dark()
- ThemeToggle component with sun/moon icons
- Theme-aware CSS using CSS custom properties
- Pass theme + styles to apps via hostContext
- Notify apps when theme changes via sendHostContextChange
Apps now receive:
- hostContext.theme: 'light' | 'dark'
- hostContext.styles.variables: All 60+ MCP CSS variables
- onhostcontextchanged notifications when theme changes
* test: update e2e goldens for theme changes
* fix: Move CSP to HTTP headers + add worker-src, frameDomains, baseUriDomains, permissions
Security improvements:
- CSP is now set via HTTP headers in serve.ts instead of meta tags
(meta tag CSP can be tampered with by same-origin content)
- CSP passed as query param to sandbox.html for header-based enforcement
New CSP/permissions features (borrowed from PR #158):
- frameDomains: control frame-src directive for nested iframes
- baseUriDomains: control base-uri directive
- permissions: camera, microphone, geolocation via iframe allow attribute
WebGL fix:
- Use document.write() instead of srcdoc for inner iframe content
(srcdoc creates opaque origin that breaks WebGL canvas updates)
- Add worker-src directive with blob: support (critical for WebGL apps
like CesiumJS/Three.js that use workers for tile decoding, terrain
processing, image processing)
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* refactor: Remove permissions support (defer to PR #158)
Keep this PR focused on CSP security fixes only.
Permissions (camera, microphone, geolocation) will be
handled in #158.
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* cleanup McpUiResourceCsp type usage / duplicate defs
* fix: guard against CSP injection in domain parameters
Validate CSP domain entries to reject characters that could:
- Break out of CSP directives (semicolons, newlines)
- Inject CSP keywords like 'unsafe-eval' (quotes)
- Inject multiple sources in one entry (spaces)
This prevents injection attacks where malicious domains could
override the security policy.
---------
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Prevents iframe from automatically applying a default background color.
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- Fix RESOURCE_MIME_TYPE to match spec: "text/html;profile=mcp-app"
- Add CSP field to McpUiSandboxResourceReadyNotification type and schema
- Update basic-host to extract and pass CSP metadata from resources
- Update sandbox.ts to dynamically inject CSP meta tag into inner iframe
- Remove static CSP from sandbox.html (now dynamic based on resource metadata)
- Update QR server to use custom read_resource handler for _meta injection
- Update requirements.txt to require mcp[cli]>=1.23.3
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Introduce new example implementations to replace simple-host and
simple-server:
- basic-host: Reference host implementation with double-iframe sandbox
pattern for secure UI isolation (outer iframe validates and relays
messages, inner iframe renders untrusted tool UI via srcdoc)
- basic-server-react: MCP server example demonstrating tool registration
with linked UI resources and React UI using the useApp() hook
Build infrastructure updates:
- Add build:all script and simplify CI/pre-commit to use it
- Add examples:dev for watch-mode development workflow
Also change PostMessageTransport logging from info to debug level.
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