Developer changelog updates for Jun 1, 2026

Summary

Add ability to specify Nextflow engine version at run time via the StartRun API using a new engine-settings parameter.

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Backported bug fixes to 15.5.19, excluding new canary features

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Backported numerous bug fixes across core, Playwright integration, dev-mode hydration, router query handling, cache tag encoding, server action rewrites, Turbopack hash encoding, FormData handling, module type handling, and adapter regio...

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Introduces automated placement of ad‑hoc activities (training, meetings) in agent schedules to minimize impact on service levels

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Increases Amazon Connect Customer agent scheduling capacity to 5,000 agents per schedule.

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Added support for encrypting Quick Research data with customer-managed KMS keys

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Adds automated email/text notifications for schedule changes and leave request status via EventBridge.

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Fixed missing FormData entries in Server Actions for React Server Components.

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Fix regression in React Server Components where FormData entries were missing in Server Actions

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Fixed missing FormData entries in Server Actions.

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Adds VPC connectivity for MCP servers, allowing Quick to link to privately hosted MCP instances without exposing them to the public internet.

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SageMaker Unified Studio now supports custom IAM permissions boundaries via Tooling blueprint, enabling SCP compliance without changing security posture.

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Introduces AWS PCS‑ready Deep Learning AMI built on the Deep Learning Base GPU AMI (Ubuntu 24.04) with pre‑installed PCS Agent, Slurm, and EFS utilities.

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Add support for EFA‑only network interfaces in SageMaker HyperPod, enabling dedicated EFA devices without attached ENA IP networking

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Adds support for referencing existing AWS Secrets Manager secret ARNs in AgentCore Identity Credential Providers.

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- New M8azn EC2 instances (5 GHz AMD EPYC) are now available in the Europe (Ireland) region.

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Introduces HyperPod troubleshooting skills for AI coding assistants (e.g., Claude Code, Cursor, Kiro) to perform natural‑language diagnostics of cluster health, GPU faults, NCCL communication, and performance bottlenecks.

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M8i and M8i‑flex general‑purpose instances are now available in the Asia Pacific (New Zealand) region.

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Adds VIF Rate Limiters for dedicated connections to cap bandwidth per VIF and prevent congestion

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Adds Amazon CloudWatch metrics for the bedrock-mantle endpoint, covering inference counts, token usage, and error counts

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Increase Buffer.poolSize default to 64 KiB and add new Buffer‑related improvements; introduce httpValidation option for stricter header validation and permission.drop API; upgrade crypto root certificates to NSS 3.123.1, harden WebCrypto...

Summary

GPT-5.5 and GPT-5.4 are now generally available on Amazon Bedrock for production workloads.

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Added tenant-level suppression lists, isolating bounces and complaints per tenant rather than sharing a single list across an account.