sapiom-sandbox-preview

sapiom-sandbox-preview is a skill for Claude Code, Codex from sapiom/sapiom-js. It costs 149 tokens per session (2,354 once invoked), scanned A, original, MIT.

A workflow for putting an app from the current project on a live Sapiom URL, either temporarily for testing or durably for sharing.

In plain words
What is it for?
Use it to authenticate Sapiom, configure a preview, publish an app link, check its status, and host ordinary project apps.
Why use it?
It provides a way to view or share a web app, dashboard, server, API, or static site outside the local development environment.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to authenticate Sapiom, configure a preview, publish an app link, check its status, and host ordinary project apps.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/sapiom/sapiom-js/sapiom-sandbox-preview
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.

Any agent
npx skills add sapiom/sapiom-js --skill sapiom-sandbox-preview
Clone the repo
git clone --depth 1 https://github.com/sapiom/sapiom-js

Made for: Claude Code, Codex.

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 sapiom-sandbox-preview

README.md
[![agentmods](https://agentmods.dev/badge/skills/sapiom/sapiom-js/sapiom-sandbox-preview/github.svg)](https://agentmods.dev/skills/sapiom/sapiom-js/sapiom-sandbox-preview)
Your own site
<a href="https://agentmods.dev/skills/sapiom/sapiom-js/sapiom-sandbox-preview"><img src="https://agentmods.dev/badge/skills/sapiom/sapiom-js/sapiom-sandbox-preview/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.

agentmods 80×15 button for sapiom-sandbox-preview

Your own site · 80×15
<a href="https://agentmods.dev/skills/sapiom/sapiom-js/sapiom-sandbox-preview"><img src="https://agentmods.dev/badge/skills/sapiom/sapiom-js/sapiom-sandbox-preview.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 149 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,354 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 7 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Privilege Escalation · line 31
    Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.
    Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
  • medium MCP Rug Pull · line 17
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium Prompt Injection · line 114
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 117
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 118
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 120
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Prompt Injection · line 122
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
How audits are shown
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 5.1 $0.00149 $0.02354
Opus 5.5 $0.00060 $0.00942
Sonnet 5.5 $0.00030 $0.00471
Haiku 4.5 $0.00015 $0.00235

Measured 2mo ago against content hash a15edacb2793, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sapiom-sandbox-preview scanned grade A with 0 findings 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 2mo 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

packages/agent-core/skills/sapiom-sandbox-preview/SKILL.md · 168 lines

How it starts

The opening of the file, as written. The whole thing — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Two ways to put the web app in the current project on a live URL, both driven by the sapiom-dev MCP (npx -y @sapiom/mcp; see the Get Started guide if it isn't connected) and both reading the same sapiom.json resource:

You want Tool The URL
To look at it now, iterate, throw it away sapiom_dev_sandbox_preview Temporary — dies with the sandbox's ttl
A link that lasts, or that someone else opens sapiom_dev_app_publish Durable — https://apps.sapiom.ai/{org}/{slug}

This is not agent deployment. Sapiom agents deploy with sapiom_dev_agents_deploy; both tools here host an ordinary app (Node server, static site, API, dashboard) from your working directory.

Prerequisite

Run sapiom_authenticate once (browser login; caches a key in ~/.sapiom/credentials.json). sapiom_dev_sandbox_preview and sapiom_dev_app_publish return a structured not-authenticated error otherwise; configure and check only touch local files and work signed-out. Check with sapiom_status.

The lifecycle

  1. sapiom_dev_sandbox_configure — creates or updates a preview resource in the project's sapiom.json. Fill the typed arguments instead of hand-writing JSON — the config is validated and written under resources.<name> (type: "sandbox"). Returns the stored config.
  2. sapiom_dev_sandbox_check (optional) — statically validates the resources without deploying. Returns { ok, sandboxes, issues }; fix any issues before previewing.
  3. sapiom_dev_sandbox_preview — reads sapiom.json, provisions the sandbox if needed, uploads the local code, builds, starts, and exposes a public URL. Returns { name, url, status, logs }. Pass name only when the project defines more than one resource.
  4. sapiom_dev_app_publish — when the link needs to outlive the sandbox. See below.

Read the full file on GitHub · 168 lines

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. 2mo ago Changed · +20 lines a15edacb2793
  2. 2mo ago First seen · 148 lines · 149 tokens per session scan A 61e01d6e32c1

Subscribe to this mod's changes

sapiom-sandbox-preview is a skill published in the GitHub repository sapiom/sapiom-js (22 stars, last pushed yesterday), licensed MIT. It adds 149 tokens to every session and 2,354 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

sapiom-sandbox-preview compared with skills from other repositories

sapiom-sandbox-preview next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
sapiom-sandbox-previewsapiom/sapiom-jsSkill22yesterdayMITA149Claude Code, Codex
gke-compute-classesgoogle/skillsSkill22kyesterdayApache-2.0A83Claude Code, Codex
gke-reliabilitygoogle/skillsSkill22kyesterdayApache-2.0A85Claude Code, Codex
gke-workload-securitygoogle/skillsSkill22kyesterdayApache-2.0A171Claude Code, Codex
cloud-architectJeffallan/claude-skillsSkill12k7d agoMITA71Claude Code
nemo-automodel-launcher-configNVIDIA/skillsSkill3.9kyesterdayApache-2.0A30Claude Code
azure-mgmt-botservice-dotnetmicrosoft/skillsSkill3.2kyesterdayMITA78Claude Code