sandcastle SKILL.md skillA
sandcastle from av/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add av/skills/sandcastle@git:20260519.b676141Pins git:20260519.b676141 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- av/skills
- Path
sandcastle/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260519.b676141, committed May 19, 2026
- Size
- 14,499 bytes
- Repository stars
- 28
- License
- MIT
Orchestrate AI coding agents (Claude Code, Codex, OpenCode) in isolated sandboxes using the @ai-hero/sandcastle SDK. Use when the user needs to (1) run agents AFK in Docker/Podman containers, (2) build multi-agent pipelines with plan-execute-review patterns, (3) run parallel agents on separate worktrees, (4) create iterative agent loops with maxIterations, (5) extract structured output from agent runs, (6) set up sandcastle in a new or existing project, or (7) write prompt files with template…
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
# Sandcastle
Sandcastle (`@ai-hero/sandcastle`) orchestrates AI coding agents inside isolated sandbox environments. It manages git worktrees, boots containers, runs agents with structured prompts, collects commits, and merges results back to branches — all from a single `run()` call.
## Installation
```bash
npm i @ai-hero/sandcastle
npx sandcastle init # scaffolds .sandcastle/ with Dockerfile and prompt templates
npx sandcastle docker build-image # builds the Docker image from .sandcastle/Dockerfile
```
## Quick Start
```typescript
import { run, claudeCode } from "@ai-hero/sandcastle";
import { docker } from "@ai-hero/sandcastle/sandboxes/docker";
const result = await run({
agent: claudeCode(),
sandbox: docker(),
promptFile: "./.sandcastle/prompt.md",
});
console.log(result.commits); // [{ sha: "abc123" }, ...]
console.log(result.branch); // branch the agent worked on
```
## Core Concepts
### The Four Entry Points
| Function | Use Case |
|---|---|
| `run(options)` | One-shot agent invocation. Full lifecycle managed automatically. |
| `createSandbox({ branch, sandbox })` | Reusable sandbox on an explicit branch. Call `.run()` multiple times. |
…Read the whole file at its exact version.
How to install
mdr add av/skills/sandcastle@sha256:5f5719f7e481b4a7The line at the top of this page pins the label git:20260519.b676141, 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_3ibchy52jc42miw3)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on May 19, 2026.
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 (14499 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
av/skills · 28 stars · license MIT · pushed 2026-10-21 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_3ibchy52jc42miw3 GET https://markdownregistry.com/api/v1/resolve?ref=av/skills/sandcastle GET https://markdownregistry.com/api/v1/blob/5f5719f7e481b4a76fc8125862933eed35050fdf6fe8f08b623b07d768244acf
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.