About NeMo Fabric

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

NVIDIA NeMo Fabric 0.3 adds packaged integrations for Pi, remote HTTP agents, and NVIDIA-labs Object Oriented Agents (NOOA). It also expands NVIDIA NeMo Relay streaming with a standalone collector, explicit request correlation, and additional adapter telemetry.

For release artifacts and the complete PR-by-PR history, refer to GitHub Releases.

Release Highlights

New Harness Integrations

The Pi adapter runs the Pi SDK in a persistent Node.js process and is distributed as nemo-fabric-adapters-pi on npm. It maps normalized models, replacement system instructions, tool policy, custom tool modules, skills, and explicit local extensions into one in-memory Pi session. Pi requires Node.js 22.19.0 or newer.

The Remote Agent adapter invokes an independently deployed service through OpenAI Responses, OpenAI Chat Completions, or Anthropic Messages-compatible HTTP APIs. It retains the completed user and assistant transcript across ordered invocations in one runtime and can consume correlated records in Agent Trajectory Observability Format (ATOF) from a collector shared with the remote deployment.

The packaged NOOA adapter integrates NVIDIA-labs Object Oriented Agents (NOOA) and supports shared InteractiveAgent targets and dedicated BenchAgent tasks, including CodingAgent, ARC Solver, and Harbor evaluation workflows. The package supports Python 3.12 and 3.13.

Collector-Backed Relay Streaming

The new nemo-fabric-collector package receives ATOF over HTTP, routes records to per-request queues, and supports multiple Fabric runtimes when request IDs are unique. Install nemo-fabric[streaming] to use the default embedded collector. Applications can instead set launch_collector=False and connect to an externally managed collector.

Relay-enabled in-process adapters propagate UUID request IDs into Relay scope context and preserve other request IDs as metadata. mini-SWE-agent now emits agent, function, model, and tool telemetry for live ATOF streaming and ATIF, OpenTelemetry, and OpenInference outputs.

For collector setup, correlation behavior, backpressure limits, and stream lifecycle requirements, refer to the Python SDK guide.

Explicit System Instruction Modes

The normalized contract now distinguishes replace and append system instruction modes. replace remains the default. Adapter descriptors declare the modes they support, and planning rejects unsupported modes before adapter startup. Claude supports both modes; the other bundled adapters support replace only.

NeMo Agent Toolkit configurations that set instructions.system must now set mode="append", because that adapter maps the value to additive instructions and cannot implement replacement semantics.

Current Limitations

The current release has the following limitations:

  • Provider-backed third-party adapter registries are not included.
  • The automated adapter conformance suite is not included. Adapter authors can use the maintained verification checklist for the required profile and declared capabilities.
  • Cancellation, live updates, and service lifecycle flags are reserved until a runtime binding exposes and tests the corresponding adapter operations.
  • The Remote Agent adapter does not normalize remote MCP, skills, tool policy, or subagent configuration. The remote service owns those capabilities and its lifecycle. Relay streaming requires an independently instrumented remote service and a collector reachable by both the service and Fabric.
  • The Pi adapter does not expose Relay, MCP, native streaming, caller-driven cancellation, or remote-service execution.