sandbox SKILL.md skillA
sandbox from marcel-bich/marcel-bich-claude-marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add marcel-bich/marcel-bich-claude-marketplace/sandbox@git:20261002.fd2015dPins git:20261002.fd2015d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- marcel-bich/marcel-bich-claude-marketplace
- Path
plugins/credo/skills/sandbox/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261002.fd2015d, committed Oct 2, 2026
- First version recorded
- Aug 21, 2026
- Size
- 6,368 bytes
- Repository stars
- 12
- License
- MIT
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.…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# sandbox - writing pre-work for clarify items Clarify items often hang on a knowledge gap that is NOT a product decision: a missing measurement, a mockup, or a proof that something is feasible. The plan / clarify role (`role-plan`) must not touch production code and must not commit. The sandbox gives it a place to do writing pre-work OFF to the side - no production code, no git, no interference with the task / build agent - so the clarify question can be answered with evidence instead of guesswork. ## Two folders - `.credo/sandbox-tmp/` = UNVERSIONED work in progress. One folder per item: `.credo/sandbox-tmp/<id>-<slug>/` with a `README.md`. This is where pre-work is built. - `.credo/sandbox/` = the PROMOTION TARGET for accepted, version-worthy artifacts. It follows the credo folder-versioning policy: in an untracked repo it stays local; in a version-tracked repo (`CREDO_VERSION_TRACKED=1`) it IS versioned. - `docs/` is NOT the promotion target. Extracting a promoted artifact into `docs/` is a SEPARATE step the user prompts for explicitly; it never happens automatically. ### exclude behavior (owned by credo-init) …
Read the whole file at its exact version.
How to install
mdr add marcel-bich/marcel-bich-claude-marketplace/sandbox@sha256:6d6ffb6ee54aa121The line at the top of this page pins the label git:20261002.fd2015d, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_mivhq6rax7qsjfuj)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Aug 21, 2026 and Oct 2, 2026, about one every 42 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261002.fd2015d latest | 2026-10-02 | fd2015d | 6,368 B | A | view · diff |
| git:20260821.cb596ad | 2026-08-21 | cb596ad | 6,332 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6368 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
marcel-bich/marcel-bich-claude-marketplace · 12 stars · license MIT · pushed 2026-11-06 · 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/6d6ffb6ee54aa1219340318ae77da6d135535011659b8b7c37778fd821544411
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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