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SEP-1865: MCP Apps - Interactive User Interfaces for MCPseps/1865-mcp-apps-interactive-user-interfaces-for-mcp

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# SEP-1865: MCP Apps - Interactive User Interfaces for MCP
## Abstract
## Motivation
## Specification
## Rationale
### Predeclared resources vs. inline embedding
### Reusing MCP JSON-RPC instead of a custom protocol
### HTML-only MVP
## Backward Compatibility
## Security Implications
## Reference Implementation