NVIDIA NeMo Agent Toolkit Release Notes#

Attention

⚠️ Deprecation Notice: NVIDIA NeMo Agent Toolkit has been deprecated as of October 2026 and will reach end of life (EOL) by end of year 2026. Depending on your needs, migrate to: NeMo Relay for observability, middleware, and governance. NeMo Helix for a unified CLI with evaluation, optimization, and hardening capabilities. NeMo Fabric for a consistent interface to run agent harnesses and custom agents. We recommend completing your migration before the EOL date.

This section contains the release notes for NeMo Agent Toolkit.

Release v1.9.0#

Summary#

  • Add HITLMiddleware for human-in-the-loop function interception

  • Enable preflight authentication for applicable authentication providers

  • Track LangChain Runnable callbacks

  • Add MLflow OTLP telemetry exporter, docs, and example

  • Export runtime context and interactive HITL models

  • Add opt-in provider hooks for generated ids and timestamps

  • Export the interactive prompt content models

  • Route interaction prompt ids and timestamps via providers

  • Add CircuitBreakerMiddleware for tool fault tolerance

  • Remove local_sandbox

  • Don’t expose the user_id parameter to the LLM

  • Improved user identity resolution

Refer to the changelog for the complete list of changes.

Known Issues#