marcel-bich/marcel-bich-claude-marketplace · plugins/credo/skills/sandbox/SKILL.md

sandbox skillA

sandbox is agent-read markdown (skill) from marcel-bich/marcel-bich-claude-marketplace: Do WRITING pre-work for a clarify item that is blocked by a knowledge gap - a missing measurement, a mockup, or a feasibility proof - WITHOUT touching production code, without git, and without disturbing the task / build agent. Use when a 1_clarify item cannot be answered by a product decision alone but needs something built or measured first; when working in the plan / clarify role and a clarify question needs evidence; and for isolated read-and-write pre-work in autonomous / AFK runs. Triggers.

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add marcel-bich/marcel-bich-claude-marketplace/sandbox@git:20260821.cb596ad
Exact content
mdr add marcel-bich/marcel-bich-claude-marketplace/sandbox@sha256:7dcbf72d32c79f2b

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_mivhq6rax7qsjfuj.svg)](https://markdownregistry.com/a/art_mivhq6rax7qsjfuj)

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Versions

versioncommittedcommitsizeaudit
git:20260821.cb596ad latest2026-08-21 cb596ad 6,332 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (6332 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

marcel-bich/marcel-bich-claude-marketplace · 13 stars · license MIT · pushed 2026-09-13 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_mivhq6rax7qsjfuj
GET https://markdownregistry.com/api/v1/resolve?ref=marcel-bich/marcel-bich-claude-marketplace/sandbox
GET https://markdownregistry.com/api/v1/blob/7dcbf72d32c79f2bd3dbe25edea0ad75174b79bcfba3abf997bbdd3ba2641534

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.