About NeMo Fabric

Release Notes

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We’re excited to announce NVIDIA NeMo Fabric 0.1, our first release. NeMo Fabric introduces a typed, observable execution layer for running applications across multiple agent harnesses. Applications, evaluation systems, and rollout infrastructure can use the same configuration, lifecycle, result, artifact, and telemetry contracts without building a separate integration for each harness.

Release Highlights

One Execution Contract Across Harnesses

NeMo Fabric provides one typed contract for configuring, launching, invoking, and observing agent harnesses. Runs produce normalized responses, structured failure details, lifecycle events, artifact references, and telemetry references. This shared contract makes it easier to compare harnesses and build experiment variations without rewriting each integration.

Four Bundled Harness Integrations

The first release includes integrations for Claude Code, Codex, LangChain Deep Agents, and Hermes Agent. Each adapter translates the shared NeMo Fabric contract into the models, tools, skills, MCP servers, runtime state, and observability capabilities supported by the harness.

Persistent Multi-Turn Runtimes

Bundled adapters use persistent local runtime hosts that retain harness-native session or thread state across turns. Single-invocation and multi-turn work use the same lifecycle, with consistent startup, invocation, failure handling, and cleanup behavior.

Portable Configuration With Compatibility Validation

The typed configuration model covers models, instructions, runtime limits, environments, tool policy, skills, MCP servers, telemetry, and NVIDIA NeMo Relay. Adapters declare the normalized configuration, telemetry, and runtime capabilities they support. NeMo Fabric rejects incompatible normalized settings and unsupported capability routes before harness invocation instead of silently dropping them.

NeMo Relay Observability and Live Streaming

All four bundled adapters integrate with NVIDIA NeMo Relay. Runs can produce raw Agent Trajectory Observability Format (ATOF) events and normalized Agent Trajectory Interchange Format (ATIF) trajectories, and export OpenTelemetry and OpenInference through Relay. Relay-enabled runtimes can also stream live ATOF records while keeping the normalized terminal result separate.

Evaluation and Experimentation Workflows

The Harbor integration brings the shared NeMo Fabric contract into isolated evaluation environments and returns normalized result and telemetry evidence. This release includes a deterministic calculator workflow and a SWE-Bench walkthrough built on a single Harbor task for comparing harness behavior on the same task.

Guided notebooks and the experimentation CLI provide additional paths for exploring harness and model variations, running maintained examples, and creating editable Python or Rust projects.

Cross-Platform Release Artifacts

NeMo Fabric ships Python artifacts for Linux on x86_64 and arm64, macOS on arm64, and Windows on x86_64. The Rust core and experimentation CLI are also published as independently versioned crates.

Current Limitations

  • Remote adapter services and a provider-backed third-party adapter registry are not included in this release.
  • The configuration and adapter contracts use v1alpha1 schema identifiers.