Contribute a First-Party NVIDIA NeMo Fabric Adapter

Use the public [nemo-fabric-build-adapter](../../../skills/nemo-fabric-build-adapter/SKILL.md) skill for adapter-contract semantics, descriptor design, configuration mapping, lifecycle behavior, and conformance evidence. This maintainer skill adds only the repository integration required for adapters shipped by NVIDIA NeMo Fabric.

Do not use this skill for a consumer that selects an existing adapter. Use the consumer nemo-fabric-integrate skill instead.

Companion Guidance

Use karpathy-guidelines to keep the change scoped, python-tests for test design, maintain-packaging for package or dependency changes, contribute-docs and review-doc-style for public text, validate-change for the validation matrix, and prepare-pr for review handoff.

Repository Integration

Follow these repository-specific requirements after applying the public skill:

1. Place a Python adapter under adapters/python/<name>/ with

LICENSE -> ../../../LICENSE, README.md, <name>.fabric-adapter.json, Python package and lock files, a source entry point, and focused tests. Place TypeScript packages under adapters/typescript/<name>/ and wire them into that npm workspace.

1. Give each Python leaf adapter a small base installation, a harness extra

for package-installable target packages, and a full extra for package-installable integrations. The Hermes adapter is the sole source-only exception and omits harness. Add a relay extra only when the adapter imports NVIDIA NeMo Relay Python APIs.

1. Add one canonical root extra that delegates to the matching leaf adapter

and its harness extra. The Hermes root extra delegates to the bare adapter because users install Hermes Agent separately from source. Keep nemo-fabric-runtime an exact-version, unconditional root dependency.

1. Add the package to the root adapter-test dependency group,

[tool.uv.sources], python_projects in justfile, applicable catalogs, and CI enumerations. Ship its descriptor under share/nemo-fabric/adapters/<name>.

1. Regenerate lockfiles and inspect the root and leaf wheel metadata. Verify

root-to-leaf delegation and every published leaf extra.

Keep descriptor claims, implementation, focused tests, public documentation, catalog entries, and packaged metadata synchronized. Start with the narrowest truthful capability set.

For instructions.system, keep config.systeminstructionmodes, planning behavior, direct adapter validation, and target-native composition synchronized. New descriptors must declare their exact replace and append support rather than relying on the legacy omitted-value behavior.

Repository Evidence

In addition to the evidence required by the public skill, include:

• A subprocess test of the packaged entry point.
• Exact descriptor assertions for every claimed capability.
• A credential-free fixture that exercises plan, doctor, and run.
• Wheel inspection when package data, dependencies, or extras change.
• Deterministic CI coverage; keep credentialed live-target tests opt-in.

Validation

Use validate-change to select the complete matrix. The common adapter checks are:

uv sync --group adapter-tests
uv run --no-sync pytest tests/adapters/test_<name>*.py
just test-python
just lock-python && just wheels
just schemas
cargo fmt --all -- --check && just test-rust
just docs
uv run pre-commit run --all-files --show-diff-on-failure
git diff --check

References

• Public contract: docs/adapter-contract/ and schemas/adapter-contract/.
• Descriptor schema: schemas/adapter-contract/adapter-descriptor.schema.json.
• Repository packaging: root pyproject.toml, justfile, adapter catalogs,

and CI workflows.

• Shared first-party Python host patterns: adapters/python/common/ and the

closest adapter with the same target boundary.