NeMo Relay

nemo-relay is the NeMo Relay package for Python applications. It gives Python code access to a portable agent runtime for execution scopes, middleware, plugins, lifecycle events, adaptive behavior, and observability around tool and LLM calls.

The package wraps the shared Rust runtime, so Python applications use the same runtime semantics as the Rust and Node.js surfaces.

Why Use It?

Use the Python binding for the following tasks:

Own execution context in Python: Group agent, tool, and LLM work into one scope tree from Python application code.
Package policy around callbacks: Use guardrails and intercepts to block work, sanitize observability payloads, rewrite requests, or wrap execution.
Emit one lifecycle stream: Send runtime events to in-process subscribers, Agent Trajectory Interchange Format (ATIF), or typed OpenTelemetry workflows.
Integrate without a framework migration: Wrap framework or provider callbacks while preserving the application’s orchestration model.

What You Get

The Python package provides the following capabilities:

Scope, tool, and LLM helpers: Managed boundaries that emit lifecycle events and run middleware in a consistent order.
Middleware APIs: Guardrails and intercepts for tool and LLM requests, responses, and execution, plus mark and scope event sanitizers for data, category_profile, and metadata.
Subscribers and exporters: OpenTelemetrySubscriber accepts one required full, gen_ai, or openinference endpoint configuration. The nemo_relay.observability helpers configure plugin-owned endpoint fan-out.
Plugin and typed helpers: Public modules for plugins, codecs, typed wrappers, adaptive runtime behavior, and observability plugin configuration.
Shared Rust runtime semantics: Python behavior aligned with the Rust and Node.js surfaces.

Installation

Install the published package with uv:

uv add nemo-relay

If you are not using uv, install it with pip:

pip install nemo-relay

Optional Dependencies

LangChain Integration

LangChain integration is available with the langchain extra:

# With uv
uv add "nemo-relay[langchain]"

# With pip
pip install "nemo-relay[langchain]"

LangGraph Integration

LangGraph integration is available with the langgraph extra, this builds upon and includes the langchain extra as well.

# With uv
uv add "nemo-relay[langgraph]"

# With pip
pip install "nemo-relay[langgraph]"

Deep Agents Integration

Deep Agents integration is available with the deepagents extra. This extra builds upon and includes the langgraph and langchain extras.

# With uv
uv add "nemo-relay[deepagents]"

# With pip
pip install "nemo-relay[deepagents]"

LangChain NVIDIA Integration

The LangChain NVIDIA extra builds upon the langchain extra adding a compatible version of the langchain-nvidia-ai-endpoints package.

# With uv
uv add "nemo-relay[langchain-nvidia]"

# With pip
pip install "nemo-relay[langchain-nvidia]"

To install this along with the langgraph extra, use:

# With uv
uv add "nemo-relay[langgraph,langchain-nvidia]"
# With pip
pip install "nemo-relay[langgraph,langchain-nvidia]"

Getting Started

import nemo_relay


def on_event(event) -> None:
    print(f"{event.kind} {event.name}")


nemo_relay.subscribers.register("printer", on_event)

with nemo_relay.scope.scope("demo-agent", nemo_relay.ScopeType.Agent) as handle:
    nemo_relay.scope.event("initialized", handle=handle, data={"binding": "python"})

nemo_relay.subscribers.flush()
nemo_relay.subscribers.deregister("printer")

Native subscriber delivery is asynchronous, so call nemo_relay.subscribers.flush() before you read subscriber output or exit. From an asyncio task, use await nemo_relay.subscribers.flush_async() so async event sanitizers can continue running on that event loop.

For host integrations that need a serialized event shape, consume the canonical JSON payload from the subscriber event object:

import json
import nemo_relay


def on_event(event) -> None:
    payload = event.to_dict()
    print(payload["kind"], payload["name"])
    assert json.loads(event.to_json()) == payload


nemo_relay.subscribers.register("host-exporter", on_event)
try:
    with nemo_relay.scope.scope("demo-agent", nemo_relay.ScopeType.Agent):
        nemo_relay.scope.event("initialized", data={"binding": "python"})
finally:
    nemo_relay.subscribers.flush()
    nemo_relay.subscribers.deregister("host-exporter")

Package Surface

The public package modules are:

nemo_relay.scope
nemo_relay.tools
nemo_relay.llm
nemo_relay.guardrails
nemo_relay.intercepts
nemo_relay.subscribers
nemo_relay.plugin
nemo_relay.adaptive
nemo_relay.observability
nemo_relay.typed
nemo_relay.codecs

Integrations

nemo_relay.integrations.langchain
nemo_relay.integrations.langgraph
nemo_relay.integrations.deepagents

The compiled extension is exposed as nemo_relay._native.

Documentation

NeMo Relay Documentation: https://docs.nvidia.com/nemo/relay

Development Status
- 4 - Beta
Intended Audience
- Developers
Programming Language

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0.6.0

Jul 22, 2026

0.6.0rc4 pre-release

Jul 22, 2026

0.6.0rc3 pre-release

Jul 21, 2026

0.6.0rc2 pre-release

Jul 18, 2026

0.6.0rc1 pre-release

Jul 17, 2026

0.5.0

Jul 8, 2026

0.4.0

Jun 12, 2026

0.3.0

May 29, 2026

0.3.0rc1 pre-release

May 29, 2026

0.3.0b2 pre-release

May 22, 2026

nemo-relay 0.7.2

NeMo Relay

Why Use It?

What You Get

Installation

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LangChain Integration

LangGraph Integration

Deep Agents Integration

LangChain NVIDIA Integration

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1 maintainer

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