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Amazon Bedrock AgentCore adds live web preview for coding agents

Preview web apps live as your coding agent builds them with Amazon Bedrock AgentCore runtime

Why we picked it

Live preview closes the feedback loop that normally breaks when a coding agent works inside a sandbox: developers can watch rendered output change on each edit rather than diffing code. Teams building agent workflows on AWS can use session endpoints to expose any port-based tooling, not just websites. Against alternatives like cloud IDE previews, the advantage is per-session authenticated URLs tied directly to the agent runtime.

Amazon Bedrock AgentCore Session endpoints now provide each runtime session with an authenticated URL that forwards any HTTP method, path, and WebSocket connection to developer-specified ports. AWS demonstrates this by deploying a coding agent that runs a Vite website inside its session. As the agent edits files, the running site updates live in the developer's browser.

Image · AWS Machine Learning Blog
Original · AWS Machine Learning Blog

Preview web apps live as your coding agent builds them with Amazon Bedrock AgentCore runtime

Amazon Bedrock AgentCore Session endpoints give each runtime session an authenticated URL that forwards any HTTP method, path, and WebSocket connection to the ports you allow. In this post, you deploy a coding agent that keeps a Vite website running in its session, then watch the live site update in your browser as the agent edits files.