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.
npx skills add archimedes-run/omniHarness --skill web-app-buildergit clone --depth 1 https://github.com/archimedes-run/omniHarnessWrote 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.
[](https://agentmods.dev/skills/archimedes-run/omniharness/web-app-builder)<a href="https://agentmods.dev/skills/archimedes-run/omniharness/web-app-builder"><img src="https://agentmods.dev/badge/skills/archimedes-run/omniharness/web-app-builder/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/archimedes-run/omniharness/web-app-builder"><img src="https://agentmods.dev/badge/skills/archimedes-run/omniharness/web-app-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00042 | $0.01679 |
| Opus 5.5 | $0.00017 | $0.00672 |
| Sonnet 5.5 | $0.00008 | $0.00336 |
| Haiku 4.5 | $0.00004 | $0.00168 |
Grade C, and why
web-app-builder scanned grade C 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 1mo ago.
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.
Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
rm -rf /mnt/user-data/outputs/my-vite-app How it starts
The opening of the file, as written. The whole thing — 171 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Web App Builder
Use this skill when the user asks to create a website, web app, dashboard, landing page, frontend prototype, or browser-based artifact that should be previewable in OmniHarness.
Artifact Layout
Always separate source code from exported artifacts:
- Source projects go under
/mnt/user-data/workspace/<artifact_id>. - Static preview outputs go under
/mnt/user-data/outputs/<artifact_id>. - Dynamic project manifests still live under
/mnt/user-data/outputs/<artifact_id>/artifact_manifest.jsoneven when the running app stays in workspace. - Every website, dashboard, or app artifact must include
/mnt/user-data/outputs/<artifact_id>/artifact_manifest.json.
Use a stable, lowercase artifact_id such as sales-dashboard, omniharness-next-site, or research-portal.
Required Manifest
Create this file in the output root for static sites:
{
"id": "artifact-id",
"title": "Human Friendly Project Title",
"type": "static_site",
"entrypoint": "index.html",
"root": ".",
"source_path": "/mnt/user-data/workspace/artifact-id",
"preview": {
"mode": "static"
},
"created_by": "agent"
}
Field reference — use exactly these key names:
| Field | Required | Notes |
|---|---|---|
id |
yes | Lowercase kebab-case. Must match the output folder name. |
title |
yes | Human-readable display name. NOT name — use title. |
type |
yes | "static_site" or "web_app". |
root |
yes | Relative path to the served root. Use "." for the output folder itself. |
entrypoint |
static only | Path to index.html relative to root. Required for static_site. |
source_path |
web_app only | Absolute workspace path of the project. Top-level field, NOT inside preview. |
preview.mode |
yes | "static" for static sites, "dev_server" for dynamic apps. |
preview.command |
web_app only | Dev-server start command, e.g. "npm run dev -- --hostname 0.0.0.0". |
preview.port |
web_app only | Port the dev server binds on, e.g. 3000. |
created_by |
no | Set to "agent". |
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.
- 1mo ago First seen · 171 lines · 42 tokens per session scan C 41f432765bdc
web-app-builder is a skill published in the GitHub repository archimedes-run/omniHarness (7 stars, last pushed yesterday), licensed MIT. It adds 42 tokens to every session and 1,679 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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