{"id":"modelcontextprotocol-ext-apps","name":"ext-apps","af_score":61.0,"security_score":47.2,"reliability_score":41.2,"what_it_does":"@modelcontextprotocol/ext-apps (MCP Apps) provides an SDK/spec for extending the core MCP protocol so that MCP tools can declare interactive UI resources (e.g., charts, forms, dashboards) that chat clients render inline (typically in a sandboxed iframe) and communicate with via host-mediated messaging.","best_when":"You control (or can implement) an MCP server and a compatible MCP Apps-capable host/client, and you want tool-driven interactive UI inside chat conversations.","avoid_when":"You only need plain text/structured JSON outputs without interactive UI, or you need a conventional hosted HTTP API with documented auth/rate limiting semantics.","last_evaluated":"2026-03-30T13:23:16.208149+00:00","has_mcp":false,"has_api":false,"auth_methods":["None described in provided README content (likely depends on MCP server/host environment)."],"has_free_tier":false,"known_gotchas":["This package is primarily protocol/SDK/spec for MCP Apps; it is not a conventional hosted API with HTTP pagination, rate-limit headers, or REST-style retry guidance.","Security and auth behavior may be delegated to the MCP server and the host/client implementation; agents should not assume standard API-key semantics from the ext-apps README alone."],"error_quality":0.0}