https://streamvessel.com/blog Engineering notes on secure access to S3 storage, for people and AI agents. en https://streamvessel.com/blog/mcp-trusted-redirect-uris https://streamvessel.com/blog/mcp-trusted-redirect-uris Wed, 04 Nov 2026 00:00:00 GMT Why MCP servers either refuse custom clients or open a phishing hole, and how per-user trusted redirect URIs, decided at sign-in, give you both.