| Filename | Latest commit message | Latest commit date |
|---|---|---|
6a8f5031be- 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 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Claude <noreply@anthropic.com> |
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| .. | ||
| src | ||
| index.html | ||
| package.json | ||
| README.md | ||
| sandbox.html | ||
| serve.ts | ||
| tsconfig.json | ||
| vite.config.ts | ||
Example: Basic Host
A reference implementation showing how to build an MCP host application that connects to MCP servers and renders tool UIs in a secure sandbox.
This basic host can also be used to test MCP Apps during local development.
Key Files
index.html/src/index.tsx- React UI host with tool selection, parameter input, and iframe managementsandbox.html/src/sandbox.ts- Outer iframe proxy with security validation and bidirectional message relaysrc/implementation.ts- Core logic: server connection, tool calling, and AppBridge setup
Getting Started
npm install
npm run start
# Open http://localhost:8080
By default, the host application will try to connect to an MCP server at http://localhost:3001/mcp. You can configure this behavior by setting the SERVERS environment variable with a JSON array of server URLs:
SERVERS='["http://localhost:1234/mcp", "http://localhost:5678/mcp"]' npm run start
Architecture
This example uses a double-iframe sandbox pattern for secure UI isolation:
Host (port 8080)
└── Outer iframe (port 8081) - sandbox proxy
└── Inner iframe (srcdoc) - untrusted tool UI
Why two iframes?
- The outer iframe runs on a separate origin (port 8081) preventing direct access to the host
- The inner iframe receives HTML via
srcdocand is restricted by sandbox attributes - Messages flow through the outer iframe which validates and relays them bidirectionally
This architecture ensures that even if tool UI code is malicious, it cannot access the host application's DOM, cookies, or JavaScript context.