live-demo

live-demo is a skill for Claude Code, Codex from robium-ai/robium. It costs 182 tokens per session (4,814 once invoked), scanned A, original, MIT.

A deployment guide for turning a working robium robot application into an interactive public web demo. Visitors can start and stop their own simulator instance, watch it boot, and hand control to a visualizer such as Foxglove.

In plain words
What is it for?
Use it to publish robot simulators as web demos, manage per-visitor instances on Cloud Run, connect a session gateway, and plan the demo page, lifecycle, visualizer, and budget.
Why use it?
It addresses the gap between an application passing a basic test and strangers being able to try it safely in a browser. It also covers diagnosing problems with simulator startup, viewer connections, and status routing.

Skill for Claude CodeCodex

Part of the robium plugin — 72 skills, 1 agent, 6 hooks shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/robium-ai/robium/1.3.3
Any agent
npx skills add robium-ai/robium --skill 1.3.3
Clone the repo
git clone --depth 1 https://github.com/robium-ai/robium

Made for: Claude Code, Codex.

Or install robium, the plugin that ships this one along with the rest of its 72 skills, 1 agent, 6 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for live-demo

README.md
[![agentmods](https://agentmods.dev/badge/skills/robium-ai/robium/1.3.3.svg)](https://agentmods.dev/skills/robium-ai/robium/1.3.3)
Your own site
<a href="https://agentmods.dev/skills/robium-ai/robium/1.3.3"><img src="https://agentmods.dev/badge/skills/robium-ai/robium/1.3.3.svg" alt="Measured on agentmods" height="20"></a>
Per session 182 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,814 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00182 $0.04814
Opus 5 $0.00091 $0.02407
Sonnet 5 $0.00036 $0.00963
Haiku 4.5 $0.00018 $0.00481

Measured 5d ago against content hash 4579fd01f1ae, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

live-demo scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (examples/demo_gateway.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- **WebSocket probes need `curl --http1.1`** <!-- id: websocket-probes-need-http1-subprotocol --> against https Cloud Run
archive/live-demo/1.3.3/SKILL.md · 294 lines

How it starts

The opening of the file, as written. The whole thing — 294 lines — stays where its author put it; the contents beside it link to each section on GitHub.

live-demo

Everything between "the app's smoke test is green" and "a stranger on the website is driving the robot." This skill owns the demo architecture that robium.ai/demos/nav-trial runs in production: a control page whose Start/Stop buttons manage private, per-visitor simulator instances on Cloud Run, a session gateway inside the app container, and a viewer handoff. Every command, flag, and gotcha here was verified live (2026-07-13, nav-trial demo); this is a distillation of a real deployment, not a design sketch.

When to use this skill

  • Publishing any robium app as an interactive web demo, and every design choice inside that: flow shape, page anatomy, instance lifecycle, visualizer, budget, and the Cloud Run deployment.
  • Debugging a deployed demo (instance won't boot, viewer can't connect, status endpoint misroutes).
  • Cross-references: go to the sibling skill instead when the question is:
    • The Cloud Run deploy mechanics themselves, meaning the build → Artifact Registry → gcloud run deploy path, the sim flag set, billing modes, the gz/DDS transport env vars, session affinity, VPC subnet sizing, deploy auth → cloud-run (this skill owns the orchestrator, gateway, and page; the deploy target under them is cloud-run's).
    • foxglove_bridge setup, layouts, or MCAP for development use → foxglove (this skill consumes its bridge; the demo-specific parts (session gateway, deep-link handoff) live here).
    • Container/compose patterns for the app itself → integration.
    • Whether the app is done enough to demo → testing (smoke test green is this skill's entry bar).
    • Env reproducibility of the app → environments.

Key directives

  • Delegation posture: embed. The demo architecture (gateway contract, Cloud Run tuning for sims, viewer decision table) exists nowhere upstream in one place; it was derived by deployment. Bridge mechanics are foxglove's; everything demo-shaped is embedded here.
  • A demo is a product surface: the smoke test extends to it. The app's demo scenario gets its own gated smoke (make demo-smoke): WebSocket handshake through the gateway, /start claim, /status reaches ready, intruder session rejected (409/403), one scripted goal succeeds, /shutdown kills the container. Ship no demo without it.
  • Scale-to-zero is non-negotiable; per-session cost is explicit. min-instances=0 always. State the per-session cost implication of the billing mode you pick (see references/cloud-run-tuning.md); never let an "idle" demo bill silently.
  • One visitor, one instance, enforced in the gateway. The session UUID claims an instance; a live tunnel is never shareable; an idle claim is takeable (reload semantics). Never rely on Cloud Run routing alone for isolation.
  • Lifecycle belongs to something that outlives the instance. The in-container gateway cannot start or restart itself (it dies with the container), and a browser cannot start a container, so a real Start button needs a host-level orchestrator. On Cloud Run the control plane is that orchestrator, which is why this only becomes visible the day you run the demo locally. Build it behind a Driver interface (LocalDocker now, CloudRun later) rather than special-casing localhost, keep it out of the data path (it hands the browser a per-instance host and gets out of the way), and give it the fleet cap. See references/orchestrator-pattern.md.
  • Be honest on the page. Cold-boot time (30–90 s, with self-restart on unlucky boots), session caps, and busy states are stated in the demo page's terminal; a demo that pretends to be instant reads as broken the moment it isn't.

Read the full file on GitHub · 294 lines

Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 294 lines · 182 tokens per session scan A 4579fd01f1ae

Subscribe to this mod's changes

live-demo is a skill published in the GitHub repository robium-ai/robium (9 stars, last pushed 7d ago), licensed MIT. It adds 182 tokens to every session and 4,814 once invoked, about $0.0009 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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