> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.nvidia.com/nemo/relay/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.nvidia.com/nemo/relay/_mcp/server.

# Release Notes

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 0.4 focuses on host plugin installation, first-party PII redaction,
local NeMo Guardrails execution, pricing-aware LLM response annotations,
streaming raw ATOF export, remote ATIF storage, and stronger coding-agent trace
fidelity.

The most important compatibility notes are:

* The Python-only NeMo Guardrails example plugin has been removed. Use the
  built-in `nemo_guardrails` component for supported Guardrails integration.
* Pricing estimates require configured pricing sources. NeMo Relay does not
  ship provider price data by default.
* Local NeMo Guardrails mode depends on Python 3.11 or newer and an available
  `nemoguardrails` runtime.
* Node.js 24 or newer remains the minimum supported Node.js version.
* Native subscriber delivery remains asynchronous. 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](https://github.com/NVIDIA/NeMo-Relay/releases).

## Release Scope

This release includes:

* Built-in NeMo Guardrails plugin support, including remote and local
  Python-backed backends.
* CLI installation, uninstallation, and doctor flows for Claude Code and Codex
  host plugins.
* Code-driven plugin configuration layered over materialized global, project,
  and user plugin files.
* First-party PII redaction plugin helpers across Rust, Python, Node.js, and
  WebAssembly surfaces.
* Model-pricing catalogs and LLM cost annotations that propagate into ATIF,
  OpenInference, and OpenTelemetry output.
* ATOF streaming endpoints for HTTP POST, WebSocket, and NDJSON collectors.
* ATIF remote storage support for HTTP endpoints in addition to S3-compatible
  storage.
* Trace fidelity fixes for Hermes, OpenClaw, LangChain, LangGraph, and Deep
  Agents integrations.

## Feature Documentation

For the major 0.4 additions, start with:

* [Plugin Installation](/nemo-relay-cli/plugin-installation)
* [Observability Plugin](/observability-plugin/about)
* [Agent Trajectory Observability Format (ATOF)](/observability-plugin/atof)
* [Agent Trajectory Interchange Format (ATIF)](/observability-plugin/atif)
* [Provider Response Codecs And Pricing](/integrate-into-frameworks/provider-response-codecs)
* [NeMo Guardrails Plugin](/nemo-guardrails-plugin/about)
* [PII Redaction API Reference](/reference/api/python-library-reference/pii-redaction)
* [OpenClaw Plugin Guide](/supported-integrations/openclaw-plugin)
* [Hermes CLI Guide](/nemo-relay-cli/hermes)
* [LangChain Integration Guide](/supported-integrations/langchain)