{"version":1,"type":"story","url":"https://digestai.news/story/amazon-bedrock-agentcore-runtime-lets-coding-agents-preview-web-apps-i","json":"https://digestai.news/story/amazon-bedrock-agentcore-runtime-lets-coding-agents-preview-web-apps-i.json","markdown":"https://digestai.news/story/amazon-bedrock-agentcore-runtime-lets-coding-agents-preview-web-apps-i.md","slug":"amazon-bedrock-agentcore-runtime-lets-coding-agents-preview-web-apps-i","headline":"Amazon Bedrock AgentCore runtime lets coding agents preview web apps in real time","summary":"Amazon Bedrock AgentCore runtime now lets developers preview web apps built by coding agents directly in their browser without deploying them. The **Session endpoints** feature runs each agent session in an isolated microVM, providing an authenticated URL that forwards HTTP requests, WebSockets, and updates to the ports developers specify. This eliminates the need for manual redeployment, enabling real-time iteration: developers can ask an agent to modify a Vite-based website, watch changes stream live, and review edits instantly—all within the same session.\n\nThe setup requires configuring allowed ports (e.g., 8090 for the Vite dev server) and using a local endpoint to forward requests with AWS credentials. While the Session endpoint authenticates every request via SigV4 or JWT, the preview page itself remains isolated to `localhost`. The feature supports HTTP/1.1, HTTP/2, and WebSocket connections, and developers can inspect internal ports (e.g., `/status`) for debugging. AWS emphasizes security: requests are logged in CloudTrail, and the local endpoint restricts access to prevent unauthorized use. The sample code, available in the [agentcore-samples GitHub repo](https://github.com/aws-samples/agentcore-samples), demonstrates deploying a Node.js agent with a Vite website and testing changes like switching to a dark theme.","keyPoints":["Session endpoints in Amazon Bedrock AgentCore runtime let developers preview web apps in real time via authenticated URLs","Developers can watch live updates from coding agents modifying Vite-based websites without manual redeployment","Requires configuring allowed ports (e.g., 8090 for Vite) and using a local endpoint with AWS credentials for security"],"whyItMatters":"This feature accelerates iterative web development by eliminating deployment bottlenecks, letting teams test agent-generated code changes instantly. It reduces friction for developers using coding agents to prototype interfaces, saving time and improving collaboration between engineers and designers.","category":{"slug":"agents","name":"Agents & Tools","url":"https://digestai.news/category/agents"},"entities":{"companies":["Amazon","AWS"],"models":["Claude Haiku 5.5"],"people":[]},"firstPublishedAt":"2026-10-30T21:40:03Z","updatedAt":"2026-10-30T21:40:03Z","sourceCount":1,"hasPrimarySource":true,"sources":[{"outlet":"AWS Machine Learning Blog","title":"Preview web apps live as your coding agent builds them with Amazon Bedrock AgentCore runtime","url":"https://aws.amazon.com/blogs/machine-learning/preview-web-apps-live-as-your-coding-agent-builds-them-with-amazon-bedrock-agentcore-runtime","publishedAt":"2026-10-30T21:40:03Z","type":"primary","primary":true,"lead":true}],"sourceNotes":null,"discussions":[],"thread":null,"cite":{"text":"Digest AI, \"Amazon Bedrock AgentCore runtime lets coding agents preview web apps in real time\", 30 October 2026, https://digestai.news/story/amazon-bedrock-agentcore-runtime-lets-coding-agents-preview-web-apps-i","publisher":"Digest AI","title":"Amazon Bedrock AgentCore runtime lets coding agents preview web apps in real time","datePublished":"2026-10-30T21:40:03Z","url":"https://digestai.news/story/amazon-bedrock-agentcore-runtime-lets-coding-agents-preview-web-apps-i"},"generatedBy":"Written by Digest AI's editorial model from the linked sources; the sources are the record.","license":"Headlines, digests and key points are written by Digest AI and may be quoted with a link to the story page. Linked articles belong to their publishers. Terms: https://digestai.news/terms#reuse"}