End-to-end NeMo Platform agent implementation from an approved agent spec. Registers and deploys the agent, generates evaluation data, runs evaluation, and signs off. Use for full spec-to-deployed-agent work, including builds from an existing legacy NAT workflow.
Install with Codex or Claude Copy this prompt, paste it into Codex, Claude, or another assistant, and let it review the skill page and install it for you.
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End-to-end NeMo Platform agent implementation from an approved Ethos. Registers and deploys the agent, generates evaluation data, runs evaluation, and signs off. Use for full Ethos-to-deployed-agent work, including builds from an existing legacy NAT workflow.
triggers
["nemo-build-agent","build the agent","create the agent","deploy the agent","scaffold the agent","make me an agent","build an agent on nemo","build from the agent Ethos","ship the agent","nemo build","deploy my existing NAT agent"]
not-for
["nemo-agent-config (use for focused agent.yaml authoring or migration)","nemo-explore (use to gather design before building)","nemo-ethos (use to write the Ethos before building)","nemo-try-agent (use to query an already deployed agent)","nemo-setup (use to install the platform first)","deploy-sandbox (use to deploy the built agent as a governed OpenShell sandbox)","generic agent framework development outside NeMo Platform"]
nemo-platform >= 0.1.0; running platform; requires agents plugin; writes files under agents/; uses nemo-agents-spec-v1 by default and preserves NAT workflow YAML as a compatibility path; macOS or Linux; safe under sandbox.
maturity
active
license
Apache-2.0
user-invocable
true
allowed-tools
["Bash","Read","Write","Edit"]
NeMo Platform agent build
Build a deployable NeMo Platform agent from an approved ETHOS.md. Use
the Platform-managed nemo-agents-spec-v1agent.yaml path by default. Treat
NAT workflow YAML as a supported compatibility path, not the default output.
Use nemo-agent-config for the machine-readable config shape. Do not expose
Fabric SDK object names or raw runtime configuration to the user.
Select the config path
Choose the config path before pre-flight. Set shared names for either path:
If the user supplies an existing NAT workflow YAML, ask whether they want to
deploy it unchanged or migrate it best-effort to nemo-agents-spec-v1 with
nemo-agent-config. For an unchanged NAT-only run, preserve the original file
and also set:
NAT_WORKFLOW_PATH=<path-to-workflow-yaml>
Pre-flight
Run the platform probe owned by nemo-status. If it reports
PLATFORM_DOWN or PLATFORM_WEDGED, route to nemo-setup and stop.
Check for existing Agent entities and deployments. Ask whether to reuse or
replace them. Follow the lifecycle branches below before create or deploy.
For an unchanged NAT-only run, confirm $NAT_WORKFLOW_PATH exists and read
it before continuing. Do not require ETHOS.md or an Ethos fileset.
For the default Platform-managed path, confirm
agents/$AGENT_NAME-ethos/ETHOS.md exists. If it does not, route through
nemo-explore and nemo-ethos first. If
agents/$AGENT_NAME-spec/AGENT-SPEC.md exists instead, route to
nemo-explore.
Read the Ethos and extract the agent name, instructions, capabilities,
model requirements, tools, constraints, and success criteria.
Steps 5 through 7 apply only to the default Platform-managed path or an explicit
NAT migration.
Existing-resource lifecycle
Reuse: Do not run agents create for an existing Agent. If a deployment
already exists, set DEPLOYMENT_NAME to its name, do not run agents deploy,
and continue to the smoke test. If only the Agent exists, skip create and run
only the deploy command in Step 1.
Replace: Show each destructive command and require explicit confirmation
immediately before running it. Use --yes only after that confirmation. If
the resource does not exist, skip its command.
Wait until this command reports that the deployment is absent before
continuing:
.venv/bin/nemo agents deployments get "$DEPLOYMENT_NAME"
Then show the Agent deletion command and require explicit confirmation before
running it:
.venv/bin/nemo agents delete "$AGENT_NAME" --yes
Verify this command reports that the Agent is absent before running the create
and deploy commands in Step 1:
.venv/bin/nemo agents get "$AGENT_NAME"
Prepare the selected config
Default: Platform-managed agent.yaml
For a new build, invoke nemo-agent-config and create:
agents/<agent-name>-ethos/
ETHOS.md
agent.yaml
Delegate authoring to nemo-agent-config. It selects the supported harness and
uses nemo-model-selection to verify the exact model against that harness's
model contract before writing the model block. Translate the approved Ethos into
system instructions, skills, MCP servers, tools, environment paths, and
telemetry. Keep every local path relative to the directory containing
agent.yaml.
Before registration, inspect skills.paths:
If it is empty, continue with the normal deployment lifecycle below.
If it is non-empty, verify every relative directory is inside the agent
packaging context and contains SKILL.md. Package the complete bundle before
deployment:
Use the packaged-image deploy command below. Do not use subprocess deployment
or the default container image because those paths materialize only
agent.yaml and do not stage relative skill directories.
Compatibility: existing NAT workflow YAML
If the user selected migration, preserve the original YAML. If a workflow,
tool, or custom Python component has no supported harness equivalent, keep the
NAT path or identify the need for a custom adapter. Never claim arbitrary NAT
workflows convert mechanically.
Use references/templates/agent.yml only when the user explicitly chooses the
legacy NAT path or needs a new NAT compatibility workflow.
Step 1: Register and deploy
For the default path:
For each operation retained by the selected lifecycle branch, follow the
nemo-agent-config confirmation requirement. Show the create command and ask
for explicit confirmation immediately before running it:
For Kubernetes, publish the packaged image and replace docker and
$IMAGE_TAG with k8s and the published image tag.
These commands assume the Agent and deployment are absent. If pre-flight found
existing resources, complete the selected lifecycle branch before running them.
nemo agents deploy waits for running by default. If the user passed
--no-wait, wait explicitly:
For the default path, invoke one question from each category in the Ethos
Scope section (Categories). Do not invent a separate category heading. For
an unchanged NAT-only run without an Ethos, use representative questions from the
workflow and the user's stated requirements:
Display each response verbatim. Stop and ask whether to adjust the agent or
continue to evaluation.
Before Step 3, branch explicitly:
For an unchanged NAT-only run without ETHOS.md, stop after the smoke
test. Do not execute Steps 3–5 and do not require an evaluation fileset.
Continue into the Ethos-driven purpose selection and Data Designer flow only
when the user requests it and agents/$AGENT_NAME-ethos/ETHOS.md exists.
If the user requests evaluation but the Ethos is absent, create and confirm
the Ethos first; do not continue to Step 3 yet.
Step 3: Generate synthetic data
Use Data Designer for every synthetic dataset. Do not hand-author evaluation,
knowledge-base, benchmark, persona, or training data.
Always select evaluation as a required data purpose. Read
agents/$AGENT_NAME-ethos/ETHOS.md and list any additional plausible
purposes: knowledge/RAG corpus, benchmark, personas/adversarial inputs,
training, or another user-requested purpose.
Wait for the user to choose any additional purposes. Evaluation cannot be
omitted. If they delegate the decision, add a knowledge base when the Ethos
requires retrieval and adversarial personas when it contains safety
constraints.
Invoke data-designer once per selected purpose, passing the agent name,
purpose, and Ethos path.
Require every generated config to read product context from
ETHOS.md; do not duplicate that context inline.
Run each generated config. For evaluation, validate the generated records,
verify the resulting fileset exists, and record its exact dataset reference
as EVAL_DATASET_REF.
Show 3 to 5 sample records per purpose and ask for approval.
A validated $AGENT_NAME-eval-* fileset and its exact EVAL_DATASET_REF must
exist before evaluation proceeds.
Step 3.5: Connect runtime data
If the generated data must be available during invocation, connect it through
the selected harness's supported skills, MCP, or tool configuration. Update
agents/$AGENT_NAME-ethos/agent.yaml through nemo-agent-config, then follow the
confirmed replacement branch before creating and deploying the Agent again.
Do not invent a generic retriever field. If the selected harness cannot consume
the required data, surface that limitation and choose a supported integration,
the NAT compatibility path, or a custom adapter.
For a legacy NAT workflow, NAT-specific retrievers may be wired into its
functions and workflow blocks using the matching NAT RAG integration.
After the replacement deployment, invoke a question that requires the data and
verify the expected tool or retrieval path was actually used.
Step 4: Evaluate
Select the actual Platform model reference as EVAL_MODEL. Create
agents/$AGENT_NAME.eval-job.json from references/templates/eval-job.json and
replace every placeholder. Its model must equal EVAL_MODEL, and its
dataset must equal the recorded EVAL_DATASET_REF from Step 3.
Validate the rendered file before creating the benchmark job:
.venv/bin/python -m json.tool "agents/$AGENT_NAME.eval-job.json" >/dev/null
if grep -Eq '<[^>]+>'"agents/$AGENT_NAME.eval-job.json"; thenecho"eval job still contains template placeholders" >&2
exit 1
fi
Also read the validated payload back and confirm its model and dataset
values match EVAL_MODEL and EVAL_DATASET_REF. Do not invoke
benchmark-jobs create if JSON validation, model validation, dataset
validation, or fileset validation fails.
Poll until the job reaches completed or failed, then download aggregate
scores. Show the score table and compare it with the success bar in
ETHOS.md.
for i in $(seq 1 24); do
status=$(.venv/bin/nemo evaluation benchmark-jobs get-status "$AGENT_NAME-eval" 2>/dev/null)
echo"$status"echo"$status" | grep -qE "completed|failed" && breaksleep 10
done
.venv/bin/nemo evaluation benchmark-jobs results aggregate-scores download \
"$AGENT_NAME-eval"
Step 5: Guardrails (optional)
For nemo-agents-spec-v1, AgentConfig has no guardrail field and the current
skills do not define a supported composition between an Agent and an IGW
guardrailed VirtualModel. Do not add guardrail fields to agent.yaml or claim
that guardrails are attached. If the Ethos requires guardrails, report this as an
unmet requirement and stop before sign-off. nemo-guardrails may be used to
configure IGW VirtualModel middleware as a separate workflow, but do not treat
it as integrated with the Agent until its model routing has been explicitly
configured and validated.
For a legacy NAT workflow, keep the NAT compatibility behavior: add supported
guardrail intercepts to the NAT workflow YAML, then follow the confirmed
replacement branch before creating and deploying it again. Never add NAT
intercepts to a nemo-agents-spec-v1 config.
For the NAT path, test one adversarial prompt and one legitimate prompt. Report
both responses and do not continue to sign-off until the expected policy is
enforced without blocking the legitimate request.
Step 6: Sign off
Invoke the success-criteria prompt from the Ethos against
$DEPLOYMENT_NAME. Print the verbatim response as the formal sign-off. Do not
claim success until the deployment is running, evaluation has completed, and
the sign-off returns an actual model response.
If verification fails
Symptom
Cause
Recovery
Agents plugin unavailable
plugins/nemo-agents is not installed
Route to nemo-setup
Config validation fails
Config does not match its declared format
Use nemo-agent-config for nemo-agents-spec-v1; use NAT schema rules only for NAT YAML
Deployment reaches failed
Runtime, adapter, image, or config startup failure
Run .venv/bin/nemo agents deployments get "$DEPLOYMENT_NAME" and .venv/bin/nemo agents logs "$DEPLOYMENT_NAME"
Referenced file is missing
Path is outside or absent from the staged agent directory
Keep paths relative to the config and package the complete agent bundle into the deployed image
Adapter or binary is missing
Selected harness dependency is not installed
Install the matching adapter/runtime package or select an available harness
Empty response
Runtime invocation failed or the selected configuration is incomplete
Inspect deployment logs and the returned structured error
Eval job fails
Dataset reference or model ID is invalid
Get the benchmark job details and correct the named input
Hard rules
Default new builds to agents/$AGENT_NAME-ethos/agent.yaml with
config_format: nemo-agents-spec-v1.
Keep ETHOS.md as the human-readable design and agent.yaml as the
machine-readable implementation config.
Preserve legacy NAT YAML unless the user explicitly requests migration.
Do not mix NAT-only keys such as functions, llms, workflow, or
intercepts into nemo-agents-spec-v1.
Do not put Platform agent.yaml fields into NAT workflow YAML.
Use a named deployment and invoke it with --agent-deployment.
Keep local artifact paths relative to the config directory.
After changing persisted Agent config, use the confirmed replacement branch
before creating and deploying it again.
