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Rtvi Vlm Customize Model

NVIDIAOfficialCreated by NVIDIA CORPORATION

  • Skill
  • Tool integration
  • Software development
  • Apache-2.0
  • Medium risk

From the author

How to swap the VLM in the VSS Alerts Blueprint — covers RTVI-VLM microservice deployment methods, all three VLM consumers (rtvi-vlm, vlm-as-verifier, vss-agent), and health checks.
— the description by NVIDIA CORPORATION

AutoGineer summary

Written by AutoGineer from the skill’s own files, not by the author

This skill provides a comprehensive procedure for updating the VLM configuration in the VSS Alerts Blueprint. It covers the three distinct VLM consumers—rtvi-vlm, vlm-as-verifier, and vss-agent—and details two primary deployment methods: using an OpenAI-compatible endpoint or running a vLLM-based model directly inside the RTVI container. The guide emphasizes correct port wiring, environment variable management, and verification steps to ensure all components are correctly synchronized.

What it does

  • Explains how to repoint the VSS Alerts Blueprint to different VLM endpoints.
  • Details the configuration of three separate VLM consumers: rtvi-vlm, vlm-as-verifier, and vss-agent.
  • Provides instructions for both OpenAI-compatible and in-container vLLM deployment methods.
  • Outlines necessary port and URL wiring requirements for local deployments.
  • Includes health check procedures to verify model readiness and inference capabilities.
  • Provides guidance on handling model identity differences between deployment methods.

When to use it

  • When you need to change the VLM endpoint used by the VSS Alerts Blueprint.
  • When you want to run rtvi-vlm as a standalone service.
  • When you need to troubleshoot configuration mismatches between the verifier, agent, and RTVI service.
  • When you are setting up a new VLM model and need to ensure all consumers are correctly aligned.

Advantages

  • Ensures consistent configuration across all VLM-dependent services.
  • Provides clear, actionable steps for both external and internal model hosting.
  • Includes robust verification commands to confirm successful deployment.
  • Helps avoid common pitfalls like stale credentials or port mismatches.

Usage examples

“Point the VSS Alerts Blueprint at a host-side NIM on http://host.docker.internal:30082 for all RTVI-VLM calls.”
The user updates the .env file with the specified endpoint and model name, then reruns the profile to apply the changes to all three VLM consumers.
“Run rtvi-vlm standalone with Qwen3-VL-8B-Instruct served inside the container.”
The user configures the standalone Compose file with the vllm-compatible method and the correct model path, ensuring the container handles the model loading.

Install

  1. Download the skill as a ZIP:

    https://autogineer.com/agent-skills/nvidia/rtvi-vlm-customize-model/download
  2. Unzip it into the cross-client skills folder of your project:

    mkdir -p .agents/skills && unzip rtvi-vlm-customize-model.zip -d .agents/skills

Documentation by NVIDIA CORPORATION

VLM Customization — VSS Alerts Blueprint

When to use

Use this skill when the user wants to:

  • repoint the VSS Alerts Blueprint to a different VLM endpoint,

  • run rtvi-vlm standalone with either an OpenAI-compatible endpoint or the in-container vLLM path,

  • fix the assumption that changing one VLM config automatically updates rtvi-vlm, vlm-as-verifier, and vss-agent.

Do not use this skill for CV detector swaps inside vss-rt-cv; use rtvi-cv-customize-model for those.

Instructions

  • Treat rtvi-vlm, vlm-as-verifier, and vss-agent as three separate VLM consumers. Do not imply that changing only RTVI_VLM_* automatically repoints the verifier or the agent UI.

  • Treat all paths in this skill as relative to a checkout of the public VSS Blueprint repository. Blueprint deployment files live under deploy/docker/...; customer-accessible RT-VLM source and standalone deployment files live under services/rtvi/rt-vlm/.... None of these paths resolve inside the DeepStream repository.

  • For blueprint-side OpenAI-compatible routing, cover all three surfaces: RTVI_VLM_* env vars, ${VSS_PROFILE_DIR}/vlm-as-verifier/configs/config.yml, and the vss-agent VLM_MODEL_TYPE / VLM_NAME / VLM_BASE_URL settings, then mention force-recreate plus log checks.

  • For standalone vllm-compatible, set VLM_MODEL_TO_USE=vllm-compatible, point MODEL_PATH at the weights source, mention HF_TOKEN only when the model actually needs auth. Do not treat a log line as proof of a working deployment: v3.2.1 logs Warmup VlmProcess-0 done even when warm-up raised an exception. Require the absence of an Error during warmup line, readiness, and one successful /v1/chat/completions response.

  • Never paste credentials into chat or logs; capture with a silent prompt (read -rsp), chmod 600 the env file, and never commit generated.env.

Examples

  • "Point the VSS Alerts Blueprint at a host-side NIM on http://host.docker.internal:30082 for all RTVI-VLM calls."

  • "Run rtvi-vlm standalone with Qwen3-VL-8B-Instruct served inside the container."

  • "I changed only RTVI_VLM_ENDPOINT in generated.env. That should repoint vlm-as-verifier and vss-agent too, right?"

Source locations

This skill is documentation-only — no VSS sources ship here. Use a VSS v3.2.1 or compatible checkout and run every command from its root. Clone/LFS, Alerts profile paths, RT-VLM tree, pinned images, and VSS_* vars: references/vss-source-layout.md.

Which modes this applies to

Mode flagWorkflowVLM role
--mode real-time (2d_vlm)Real-time VLM alertsPrimary — every alert is VLM-driven
--mode verification (2d_cv)CV + VLM verificationVerifier — VLM confirms each CV incident

VLM customization applies to both modes. Three services each make their own VLM calls with separate configuration:

ServiceWhen usedConfig location
rtvi-vlmReal-time alert generation; rtvi_vlm_alert tool calls from agent UIRTVI_VLM_* vars in ${VSS_PROFILE_DIR}/.env / generated.env
vlm-as-verifier (alert-bridge)Post-processing: confirms each mdx-incidents event (2d_cv only)${VSS_PROFILE_DIR}/vlm-as-verifier/configs/config.yml
vss-agentInteractive agent UI queriesVLM_MODEL_TYPE, VLM_BASE_URL, VLM_NAME in ${VSS_PROFILE_DIR}/.env

All three can point at the same model endpoint — they don't have to.

alert-bridge and vss-agent are closed-source; their pinned images (and the rtvi-vlm image tag) are listed in references/vss-source-layout.md.


RTVI-VLM: Two Deployment Methods

The implementation is selected by VLM_MODEL_TO_USE (standalone) or RTVI_VLM_MODEL_TO_USE (VSS blueprint).

Method A: OpenAI-Compatible Endpoint (openai-compat)

The RTVI container makes HTTP calls to an external inference server; it does not load the model itself. This covers local or remote NIM, external vLLM, and OpenAI.

Method B: vLLM Inside the RTVI Container (vllm-compatible)

The container downloads and serves the model using its bundled vLLM engine. No external inference server is needed.

Hard constraint: The model architecture must be supported by the vLLM version shipped in the selected RTVI image. Check the supported-model guidance in services/rtvi/rt-vlm/README.md. If the model requires a newer vLLM, use Method A with an external container instead.


Configuring RTVI-VLM via VSS Blueprint

The VSS blueprint .env / generated.env maps most RTVI_VLM_* variables to container-native names. The model or deployment identifier is the important exception: v3.2.1 maps VLM_NAME to VIA_VLM_OPENAI_MODEL_DEPLOYMENT_NAME. RTVI_VLM_PORT is also exceptional: it is required by Compose to publish the service and must be explicitly supplied when generated.env does not contain it.

Required port configuration — all Blueprint workflows

Add RTVI_VLM_PORT and update the two hardcoded 8018 lines in the Alerts profile .env, then rerun dev-profile.sh. Edit .env, not generated.env — the generator overwrites it.

# ${VSS_PROFILE_DIR}/.env
RTVI_VLM_PORT=8018                                        # add this line
RTVI_VLM_BASE_URL=http://${HOST_IP}:${RTVI_VLM_PORT}     # update: was http://${HOST_IP}:8018
RTVI_VLM_ENDPOINT=http://${HOST_IP}:${RTVI_VLM_PORT}/v1  # update: was http://${HOST_IP}:8018/v1

Keep the value at 8018 unless that port is unavailable. Variable ownership, the VLM_BASE_URL generator overwrite, and the patch required for any other port are in references/port-and-url-wiring.md.

Method A — OpenAI-compatible endpoint

In the v3.2.1 blueprint Compose file, these host variables map as follows:

Blueprint variableContainer variable
RTVI_VLM_MODEL_TO_USEVLM_MODEL_TO_USE
RTVI_VLM_ENDPOINTVIA_VLM_ENDPOINT
RTVI_VLM_API_KEYVIA_VLM_API_KEY
VLM_NAMEVIA_VLM_OPENAI_MODEL_DEPLOYMENT_NAME
RTVI_VLM_MODEL_PATHMODEL_PATH

After applying the shared port configuration above, configure the active profile environment:

# ${VSS_PROFILE_DIR}/.env
RTVI_VLM_MODEL_TO_USE=openai-compat
RTVI_VLM_ENDPOINT=http://host.docker.internal:30082/v1
VLM_NAME=<model-or-deployment-id>
OPENAI_API_KEY=<your-api-key>     # client fallback/default credential
RTVI_VLM_API_KEY=<your-api-key>   # mapped to preferred VIA_VLM_API_KEY
# RTVI_VLM_IMAGE_TAG=3.2.1    # pin to a specific image tag; defaults to 3.2.1

For an authenticated Method A endpoint, set OPENAI_API_KEY and RTVI_VLM_API_KEY to the same endpoint-specific credential. The stock Compose file maps RTVI_VLM_API_KEY to VIA_VLM_API_KEY, and the OpenAI-compatible client prefers VIA_VLM_API_KEY over OPENAI_API_KEY. Leave both unset only when the endpoint intentionally accepts unauthenticated requests.

Examples:

# NIM on the Docker host. Stock Compose maps this name through host-gateway.
RTVI_VLM_ENDPOINT=http://host.docker.internal:30082/v1
VLM_NAME=nvidia/cosmos-reason2-8b

# NVIDIA API catalog (set keys via silent prompt)
RTVI_VLM_ENDPOINT=https://integrate.api.nvidia.com/v1
VLM_NAME=nvidia/cosmos-reason2-8b
OPENAI_API_KEY=<your-nvidia-api-key>
RTVI_VLM_API_KEY=<your-nvidia-api-key>

# OpenAI (set keys via silent prompt)
RTVI_VLM_ENDPOINT=https://api.openai.com/v1
VLM_NAME=gpt-4o
OPENAI_API_KEY=<your-openai-api-key>
RTVI_VLM_API_KEY=<your-openai-api-key>

Migrating from Method B: Replace RTVI_VLM_API_KEY before recreating rtvi-vlm; do not leave the previous NGC credential in that variable. If RTVI_VLM_API_KEY is empty, stock Compose falls back to NGC_CLI_API_KEY when populating VIA_VLM_API_KEY. Because the client prefers VIA_VLM_API_KEY, a stale NGC key would be sent to the new Method A endpoint instead of OPENAI_API_KEY. This is both an authentication failure and a credential-disclosure risk.

RTVI_VLM_OPENAI_MODEL_DEPLOYMENT_NAME is not consumed by the public v3.2.1 blueprint Compose file. Use VLM_NAME unless the deployed Compose file has been intentionally customized.

Verify the configured model identifier from inside the RTVI container. The conditional Authorization header keeps keyless local endpoints working while authenticating endpoints such as OpenAI and the NVIDIA API Catalog. Endpoints may advertise multiple models, so confirm the configured ID appears anywhere in the /models response:

ALERTS_ENV=developer-profiles/dev-profile-alerts/generated.env

# Container-native name for `VLM_NAME`.
EXPECTED_MODEL="$(docker compose --env-file "${ALERTS_ENV}" exec -T rtvi-vlm \
  printenv VIA_VLM_OPENAI_MODEL_DEPLOYMENT_NAME | tr -d '\r')"
test -n "${EXPECTED_MODEL}"

docker compose --env-file "${ALERTS_ENV}" exec -T rtvi-vlm sh -lc \
  'set --
   if [ -n "${VIA_VLM_API_KEY:-}" ]; then
     set -- -H "Authorization: Bearer ${VIA_VLM_API_KEY}"
   fi
   curl -fsS "$@" "${VIA_VLM_ENDPOINT%/}/models"' \
  | jq -e --arg model "${EXPECTED_MODEL}" 'any(.data[]; .id == $model)' \
  || { echo "Endpoint does not advertise '${EXPECTED_MODEL}'" >&2; exit 1; }

jq -e exits non-zero when the assertion is false, so the check passes only when the configured model appears somewhere in the list. To see which models the endpoint offers, drop the jq filter and read the raw response.

Treat HTTP 401 from this request as an authentication failure. Only treat a successful response that fails the jq assertion as a model-name mismatch.

Method B — vLLM inside RTVI container
RTVI_VLM_MODEL_TO_USE=vllm-compatible
RTVI_VLM_MODEL_PATH=git:https://huggingface.co/Qwen/Qwen3-VL-30B-A3B-Instruct

# With HuggingFace token:
# HF_TOKEN=<your-hf-token>

# From NGC:
# RTVI_VLM_MODEL_PATH=ngc:nim/nvidia/cosmos-reason2-8b:hf-1208

MODEL_PATH prefix conventions (see public services/rtvi/rt-vlm/src/vlm_pipeline/ngc_model_downloader.py):

  • ngc:<registry>/<org>/<model>:<version> — download from NGC

  • git:<url> — clone from HuggingFace or any git LFS repo

  • /path/to/local/dir — use pre-downloaded local weights

A bad MODEL_PATH aborts startup during download, before the server binds its port, so the container exits non-zero. v3.2.1 raises a plain Exception: Failed to download model <name> from <url> for git: paths, and Model download failed with status code <code>, Could not authenticate with NGC., or Could not find the model. for ngc: paths.


Configuring RTVI-VLM Standalone

When running services/rtvi/rt-vlm/docker/compose.yaml from the public VSS checkout, use the container-native names:

# services/rtvi/rt-vlm/docker/.env
BACKEND_PORT=8000

# Method A
VLM_MODEL_TO_USE=openai-compat
VIA_VLM_ENDPOINT=http://host.docker.internal:30082/v1
VIA_VLM_OPENAI_MODEL_DEPLOYMENT_NAME=nvidia/cosmos-reason2-8b
VIA_VLM_API_KEY=<your-api-key>       # if required; set via silent prompt

# Method B
VLM_MODEL_TO_USE=vllm-compatible
MODEL_PATH=git:https://huggingface.co/Qwen/Qwen3-VL-8B-Instruct

The standalone Compose file defaults to nvcr.io/nvidia/vss-core/vss-rt-vlm:3.2.1 and requires BACKEND_PORT to be set. All supported VLM_MODEL_TO_USE values: openai-compat, vllm-compatible, cosmos-reason1, cosmos-reason2, cosmos-reason3, custom.

Both stock Compose definitions use bridged networking and map host.docker.internal through host-gateway. Choose the endpoint host by where the inference server runs:

  • Docker host: host.docker.internal

  • Same Compose network: the inference server's Compose service name

  • Remote machine: a routable hostname or IP address

  • localhost: only when the RTVI container explicitly uses host networking

For standalone Method A, verify connectivity from inside rtvi-server:

docker compose exec -T rtvi-server sh -lc \
  'set --
   if [ -n "${VIA_VLM_API_KEY:-}" ]; then
     set -- -H "Authorization: Bearer ${VIA_VLM_API_KEY}"
   fi
   curl -fsS "$@" "${VIA_VLM_ENDPOINT%/}/models"'

See the environment-variable reference in public services/rtvi/rt-vlm/README.md.


Configuring vlm-as-verifier (2d_cv mode only)

vlm-as-verifier runs as the alert-bridge service and is separate from RTVI-VLM. Its config is bind-mounted from ${VSS_PROFILE_DIR}/vlm-as-verifier/configs/config.yml.

Keep the config parameterized:

# ${VSS_PROFILE_DIR}/vlm-as-verifier/configs/config.yml
vlm:
  base_url: ${VLM_BASE_URL}/v1
  model: ${VLM_NAME}
  max_tokens: 4096

For the v3.2.1 local-VLM Alerts flow, dev-profile.sh --vlm-device-id ... populates VLM_BASE_URL with http://<host-ip>:8018 and sets VLM_NAME in the generated environment. Remote mode likewise writes the selected endpoint. Only hardcode these fields when deliberately overriding the profile-generated values.

The 8018 here is literal in the generator, not derived from RTVI_VLM_PORT. If RTVI-VLM is published on any other port, alert-bridge still dials 8018 until you patch VLM_BASE_URL in generated.env (references/port-and-url-wiring.md).

After editing the config or environment, recreate the service:

cd "${VSS_DEPLOY_DIR}"
docker compose \
  --env-file developer-profiles/dev-profile-alerts/generated.env \
  up -d --force-recreate alert-bridge

Configuring vss-agent

vss-agent is another separate consumer. The v3.2.1 Alerts profile selects a block in ${VSS_PROFILE_DIR}/vss-agent/configs/config.yml using VLM_MODEL_TYPE. The local RTVI-VLM flow uses rtvi:

rtvi_vlm:  # VLM_MODEL_TYPE=rtvi
  base_url: ${RTVI_VLM_BASE_URL}/v1
nim_vlm:   # VLM_MODEL_TYPE=nim
  base_url: ${VLM_BASE_URL}/v1
openai_vlm: # VLM_MODEL_TYPE=openai
  base_url: ${VLM_BASE_URL}/v1
vllm_vlm:  # VLM_MODEL_TYPE=vllm
  base_url: ${VLM_BASE_URL}/v1

For a v3.2.1 local Alerts deployment, keep the generated values, which are normally equivalent to:

VLM_MODEL_TYPE=rtvi
VLM_NAME=<model-id>
RTVI_VLM_PORT=8018                                    # from .env
RTVI_VLM_BASE_URL=http://<host-ip>:${RTVI_VLM_PORT}   # from .env
VLM_BASE_URL=http://<host-ip>:8018                    # written by dev-profile.sh

RTVI_VLM_PORT is required by the rtvi-vlm Compose port mapping and has no Compose default. Define it in the Alerts profile .env and regenerate generated.env before using any of these Compose commands. The two URLs have different owners and agree only at the default port; see references/port-and-url-wiring.md.

For a remote NIM, OpenAI-compatible endpoint, or external vLLM, select the matching nim, openai, or vllm profile and set VLM_BASE_URL without a trailing /v1 because the config appends it. Recreate vss-agent after changing these values.


Health Checks

After changing VLM configuration, recreate the affected service and inspect it through the same Alerts Compose model:

cd "${VSS_DEPLOY_DIR}"
ALERTS_ENV=developer-profiles/dev-profile-alerts/generated.env
# Required when an existing `generated.env` does not yet contain the port.
# The persistent fix is to add it to the profile `.env` and regenerate.
export RTVI_VLM_PORT=8018

# Recreate RTVI-VLM and wait up to 10 minutes for its Compose healthcheck.
docker compose --env-file "${ALERTS_ENV}" \
  up -d --force-recreate --wait --wait-timeout 600 rtvi-vlm

# The container must still be running. A failed weights download exits here.
CID="$(docker compose --env-file "${ALERTS_ENV}" ps -aq rtvi-vlm)"
test "$(docker inspect -f '{{.State.Status}}' "${CID}")" = running || {
  docker logs --tail 50 "${CID}" >&2; exit 1; }

# Require the absence of a download or warm-up failure. `Warmup ... done` is
# logged on both paths in v3.2.1, so only the error lines are conclusive.
docker logs "${CID}" 2>&1 | grep -Eq \
  'Failed to download model|Model download failed|Could not find the model|Could not authenticate with NGC|Error during (model )?warmup' \
  && { echo 'rtvi-vlm failed to download weights or warm up' >&2; exit 1; }

# Confirm the readiness endpoint from inside the container.
docker compose --env-file "${ALERTS_ENV}" exec -T rtvi-vlm \
  curl -fsS http://localhost:8000/v1/health/ready

# Capture the implementation and the model ID advertised by the live service.
VLM_METHOD="$(docker compose --env-file "${ALERTS_ENV}" exec -T rtvi-vlm \
  printenv VLM_MODEL_TO_USE | tr -d '\r')"
ACTUAL_MODEL="$(docker compose --env-file "${ALERTS_ENV}" exec -T rtvi-vlm \
  curl -fsS http://localhost:8000/v1/models | jq -er '.data[0].id')"
test -n "${ACTUAL_MODEL}"

# Readiness and /v1/models only report metadata. Require one real inference; a
# text-only chat request needs no media asset and works on both methods.
docker compose --env-file "${ALERTS_ENV}" exec -T rtvi-vlm \
  curl -fsS --max-time 120 -X POST http://localhost:8000/v1/chat/completions \
  -H 'Content-Type: application/json' \
  -d "$(jq -nc --arg m "${ACTUAL_MODEL}" '{model: $m, max_tokens: 16, stream: false,
        messages: [{role: "user", content: "Reply with: ok"}]}')" \
  | jq -e '((.choices[0].message.content // "") | length) > 0' > /dev/null \
  || { echo 'inference smoke test returned no content' >&2; exit 1; }

Readiness is built from is_alive() per process, so it reports healthy: true for a live process whose model never warmed up, and /v1/chat/completions returns HTTP 200 with empty content when the pipeline produced no output. The jq assertion on non-empty content is what makes the last check meaningful.

Model identity differs by method

The two methods advertise their model ID differently, so the follow-up check is not the same:

  • Method A (openai-compat) — verify that the configured VIA_VLM_OPENAI_MODEL_DEPLOYMENT_NAME appears anywhere in the /v1/models list using the any(.data[]; .id == $model) check from the Method A endpoint verification section. Treat HTTP 401 as an authentication failure; treat a 200 response where the model is absent as a model-name mismatch.

  • Method B (vllm-compatible) — do not compare the advertised ID against VLM_NAME or VIA_VLM_OPENAI_MODEL_DEPLOYMENT_NAME. The resolved model directory basename becomes the advertised /v1/models ID, so ngc:nim/nvidia/cosmos-reason2-8b:hf-1208 is served as nim_nvidia_cosmos-reason2-8b_hf-1208. That difference is expected for Method B and does not indicate a deployment failure. Point downstream consumers (vlm-as-verifier, vss-agent) at that advertised ID, never at the NGC or Hugging Face path.

Run the per-method verification commands from references/health-checks.md — covers the Method A identity check, the Method B inspection, warm-up diagnostics, and querying a specific external endpoint.

Files

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Requirements and compatibility

Works with: Claude Code, Claude apps, OpenAI Codex, GitHub Copilot, Cursor, Gemini CLI, Kiro, OpenCode, Goose, Amp, Roo Code, JetBrains Junie, Factory Droid, Devin (ex-Windsurf), Mistral Vibe, OpenHands, Letta

“Works with” means the tool reads the open Agent Skills format; a skill written for one tool may use features others lack.

Needs: Needs network access, Needs an API key, Needs a command-line tool

Security

What our scanner noticed· Medium risk

  • Large base64-encoded blobs
  • Instructions that use the network

A static scan is not a guarantee. Skills are third-party content: review a skill before you let an agent use it.

Attribution and licence

Created by
NVIDIA CORPORATION
Publisher
NVIDIA (Official)
Source
NVIDIA/skills · skills/rtvi-vlm-customize-model · commit fce3cca
Licence
Apache License 2.0 (redistribution allowed)
  • LICENSE (added by AutoGineer from LICENSE-APACHE)
  • ATTRIBUTION.md (written by AutoGineer)
Synced

AutoGineer is not affiliated with or endorsed by NVIDIA CORPORATION or NVIDIA.

Download ZIP

The ZIP holds the skill’s files, its licence files and an ATTRIBUTION.md. Download rtvi-vlm-customize-model.zip