NVIDIA NeMo Fabric

NVIDIA NeMo Fabric is a runtime execution layer for agents. It turns multiple agent harnesses into one configurable, observable lifecycle surface.

NeMo Fabric standardizes how applications configure, launch, invoke, and collect artifacts from agent harnesses. It provides:

• a versioned, typed configuration contract;
• ordinary Python composition for experiment variants;
• adapter integrations for harness-specific launch and control;
• a Python SDK backed by the Rust core;
• normalized run results, artifact manifests, and telemetry references.

Install

Install the core runtime and Python SDK:

pip install nemo-fabric

To use a supported agent harness, install its adapter extra:

pip install "nemo-fabric[claude]"
pip install "nemo-fabric[codex]"
pip install "nemo-fabric[deepagents]"
pip install "nemo-fabric[hermes]"

Fabric supports running an agent harness in a different virtual environment than the one used to run Fabric itself. This is useful for running agents that have conflicting dependencies with Fabric or other agents.

The adapter must be installed into the virtual environment that the harness is installed in. For this reason adapters intentionally have minimal dependencies.

Integrations

Harbor integration:

pip install "nemo-fabric[harbor]"

Relay integration:

pip install "nemo-fabric[relay]"

Python Versions

NeMo Fabric supports Python versions 3.11-3.14, however some of the integrations and adapters may have additional requirements. Specifically the Hermes adapter doesn't support Python 3.14 yet, and the Harbor integration requires Python 3.12 or later.

Core Concepts

• Typed configuration: Construct a complete FabricConfig in Python and use ordinary functions to create experiment variants.
• Adapters: Select harness-specific integrations with harness.adapter_id.
• Artifacts: Receive normalized output, logs, patches, and telemetry references through an ArtifactManifest.

The experimental nemo-fabric CLI is distributed separately from the Python package. It selects complete typed configs from built-in presets and maintained examples. Applications that need a stable integration surface should use the Python SDK.

Learn More

Refer to the NVIDIA NeMo Fabric documentation for installation, configuration, and usage guidance. Source code is available in the NVIDIA NeMo Fabric repository.