About NVIDIA NeMo Relay

Release Notes

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This page summarizes the current documentation-visible release state. GitHub Releases remain the source of truth for complete release history and tag-specific notes.

Current Release

NeMo Relay 0.3 focuses on the renamed NeMo Relay runtime, plugin-driven agent observability, guardrails integration, adaptive behavior for coding agents, and ATIF v1.7 trace export.

The most important compatibility notes are:

  • The project and package-facing documentation now use the NeMo Relay name.
  • The core runtime registry surface has been narrowed. Code that registered runtime behavior through older broad registry entry points should move to the documented middleware, subscriber, and plugin APIs.
  • Node.js 24 or newer is now the minimum supported Node.js version.
  • Native subscriber delivery is now non-blocking. Code that depends on subscriber callback side effects, exporter output, or deterministic test assertions must call the subscriber flush API.

Use the child pages for release highlights and support notes. For the complete PR-by-PR changelog, release artifacts, and tag-specific history, use GitHub Releases.

Release Scope

This release includes:

  • Built-in NeMo Guardrails plugin support, including a remote backend and CLI editor support.
  • Canonical ATOF event JSON exposure across Rust, Python, and Node.js bindings.
  • ATIF v1.7 exporter updates for nested subagents, tool-observation correlation, and first-class S3-compatible storage export.
  • Adaptive plugin support for the CLI and OpenClaw integration, including editor support for adaptive configuration.
  • Streaming LLM chunk marks and improved guardrail scope emission.
  • Python plugin context-manager ergonomics.
  • Non-blocking native subscriber delivery with flush APIs across Rust, Python, Node.js, FFI/Go, and WebAssembly parity.
  • LangChain serialization fixes and OpenClaw trace replay visibility fixes.
  • Fern documentation publishing, link validation, and updated guidance for agent runtime concepts, trace incident response, plugin building, and adaptive tuning.

Feature Documentation

For the major 0.3 additions, start with: