The September 23, 2026, update to Claude Code introduces significant infrastructure and stability enhancements, particularly regarding the Claude apps gateway and Bedrock integrations. The gateway now supports Amazon Bedrock upstreams by assuming IAM roles via STS, allowing for cross-account access and optional per-developer sessions. To ensure security, a new guardrail mechanism has been implemented to apply Amazon Bedrock guardrails to every request. Additionally, the update introduces MCP URL-mode elicitation, enabling servers to trigger browser-based authentication flows without leaving a waiting dialog on the screen. Technical improvements to session management address several critical edge cases, including fixes for interrupted tool calls, lost prompt caches during MCP server disconnections, and errors caused by oversized image returns or overlong tool names. The release also optimizes performance by reducing startup latency—specifically by deferring git reads and telemetry—and improving the resumption speed of long sessions. For developers, the update adds enhanced plugin validation to report dropped entries or insecure URLs and introduces a recommendation system in /insights to estimate the potential utility of auto mode based on recent session permission prompts.