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Update CSP documentation for widget-declared mode #1062

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Update CSP documentation for widget-declared mode #1062

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30 changes: 18 additions & 12 deletions docs/contributing/mcp-apps-architecture.mdx
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Expand Up @@ -271,19 +271,25 @@ Serves the sandbox proxy HTML that creates the double-iframe architecture.

### Content Security Policy

The sandbox proxy uses a permissive CSP to allow widget content:
The sandbox proxy uses a CSP that varies based on the widget's declared security mode:

```html
<meta
http-equiv="Content-Security-Policy"
content="
default-src 'self';
script-src 'self' 'unsafe-inline' 'unsafe-eval' blob: data: https://cdn.tailwindcss.com ...;
style-src * blob: data: 'unsafe-inline';
connect-src *;
...
"
/>
**Widget-declared mode**: Restricts resources to only those declared in `resource_domains`
```
img-src 'self' data: blob: <resource_domains>
media-src 'self' data: blob: <resource_domains>
```

**Permissive mode**: Allows all HTTPS sources
```
img-src 'self' data: blob: https:
media-src 'self' data: blob: https:
```

Other directives remain permissive to support widget functionality:
```
script-src 'self' 'unsafe-inline' 'unsafe-eval' blob: data: https://cdn.tailwindcss.com ...
style-src * blob: data: 'unsafe-inline'
connect-src *
```

### Iframe sandbox attributes
Expand Down