Adapt UI to both this repo's gateway and agentgateway/agentgateway - #4
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Introduces a backend adapter layer that allows the demo UI to work with multiple gateway implementations: - mcp-proxy (Python gateway, default) - agentgateway (Rust gateway) New file: demo/ui/backend.py - GatewayBackend abstract base class defining the interface - MCPProxyBackend: adapter for current Python mcp-proxy gateway - Uses JSON-RPC over /mcp/ with session management - Health check via /status - OAuth via /oauth/connect - AgentGatewayBackend: adapter for Rust agentgateway - Uses /config for health, /registry for tool definitions - Supports loading registry from gateway backend - Helper functions for registry format conversion between backends - load_registry_from_file() extracted from main.py Updated: demo/ui/main.py - Import and initialize backend based on GATEWAY_BACKEND env var - Replace direct gateway calls with backend adapter methods: - check_gateway_health() -> gateway_backend.check_health() - call_tool() -> gateway_backend.call_tool() - OAuth connect -> gateway_backend.connect_oauth() - Add "From Gateway" option in registry selector for agentgateway - Auto-load registry from agentgateway backend on startup - Display backend name in status badge (header) Configuration: - GATEWAY_BACKEND: "mcp-proxy" (default) or "agentgateway" - GATEWAY_URL: Backend URL (defaults vary by backend type) This enables the same UI codebase to be used with either the Python mcp-proxy or Rust agentgateway backend implementations.
Documents how to test the UI with both MCP Proxy (Python) and Agent Gateway (Rust) backends, including: - Required repositories and branches for each backend - Environment variable configuration - Feature differences between backends - Architecture overview of the backend adapter pattern
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Add multi-gateway backend support to Demo UI
Summary
Introduces a backend adapter pattern that allows the Demo UI to work with multiple MCP gateway implementations:
jakemannix/agentgatewayThis enables the same UI to be used for testing and demonstrating either gateway implementation by setting environment variables.
Changes
demo/ui/backend.py(new) - Backend adapter module with:GatewayBackendabstract base class defining the interfaceMCPProxyBackend- Implementation for Python mcp-proxy (/mcp/,/status,/oauth/connect)AgentGatewayBackend- Implementation for Rust agentgateway (/mcp,/config,/registry)get_backend()factory function usingGATEWAY_BACKENDenv varconvert_agentgateway_registry()- Format conversion (snake_case → camelCase)demo/ui/main.py- Refactored to use backend adapter:demo/ui/README.md(new) - Documentation covering:Configuration
Test plan
Start mcp-proxy gateway, verify UI connects and shows "MCP Proxy (Python) Connected"
Test tool listing and execution with mcp-proxy backend
Set GATEWAY_BACKEND=agentgateway, verify UI shows "Agent Gateway (Rust)" in status
Test "From Gateway" registry loading with agentgateway backend
Verify existing tests still pass (uv run pytest)