modal-sandbox

modal-sandbox is a skill for Kiro from jayll1303/AIEKit. It costs 100 tokens per session (1,830 once invoked), scanned A, original, no licence file.

Guidance for using Modal Sandbox, an isolated environment for running code separately from the main system. It covers interactive sessions, file uploads, output streaming, and reconnecting to running sandboxes.

In plain words
What is it for?
Running untrusted or user-provided code, keeping an interactive process alive, streaming command output, reconnecting to a sandbox, uploading files during execution, and exposing a tunneled HTTP service.
Why use it?
It helps when code cannot be trusted or a controller process must stay available between commands. It also explains how to observe and manage long-running sandbox work.

Skill for Kiro

Written for Kiro: installed under .kiro/.

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/jayll1303/aiekit/modal-sandbox
Any agent
npx skills add jayll1303/AIEKit --skill modal-sandbox
Clone the repo
git clone --depth 1 https://github.com/jayll1303/AIEKit

Made for: Kiro.

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 modal-sandbox

README.md
[![agentmods](https://agentmods.dev/badge/skills/jayll1303/aiekit/modal-sandbox.svg)](https://agentmods.dev/skills/jayll1303/aiekit/modal-sandbox)
Your own site
<a href="https://agentmods.dev/skills/jayll1303/aiekit/modal-sandbox"><img src="https://agentmods.dev/badge/skills/jayll1303/aiekit/modal-sandbox.svg" alt="Measured on agentmods" height="20"></a>
Per session 100 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,830 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown 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 $0.00100 $0.01830
Opus 5 $0.00050 $0.00915
Sonnet 5 $0.00020 $0.00366
Haiku 4.5 $0.00010 $0.00183

Measured 6d ago against content hash d6f52b607674, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

modal-sandbox 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 6d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/smoke_test.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.

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.

.kiro/skills/modal-sandbox/SKILL.md · 100 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 6d ago First seen · 100 lines · 100 tokens per session scan A d6f52b607674

Subscribe to this mod's changes

modal-sandbox is a skill published in the GitHub repository jayll1303/AIEKit (18 stars, last pushed 2mo ago), with no licence file. It adds 100 tokens to every session and 1,830 once invoked, about $0.0005 per session on Opus 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.

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