vellum-ai/vellum-assistant · skills/plugin-builder/SKILL.md

plugin-builder skillA

plugin-builder is agent-read markdown (skill) from vellum-ai/vellum-assistant: Use when the user wants to build, scaffold, ship, or edit a Vellum plugin that bundles multiple surfaces (hooks, tools, skills, and more) into one installable package..

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 vellum-ai/vellum-assistant/plugin-builder@git:20260903.5802532
Exact content
mdr add vellum-ai/vellum-assistant/plugin-builder@sha256:8e06fcc41a4f6195

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_rli5dj2sh3gk4kz4.svg)](https://markdownregistry.com/a/art_rli5dj2sh3gk4kz4)

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Versions

versioncommittedcommitsizeaudit
git:20260903.5802532 latest2026-09-03 5802532 11,960 BA view · diff
git:20260821.21c4ce12026-08-21 21c4ce1 12,193 BA view · diff
git:20260820.1ae37bb2026-08-20 1ae37bb 11,298 BA view · diff
git:20260716.2ed537f2026-07-16 2ed537f 11,290 BA view · diff
git:20260715.5b9fbf12026-07-15 5b9fbf1 11,147 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 (11960 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

vellum-ai/vellum-assistant · 1,206 stars · license MIT · pushed 2026-09-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_rli5dj2sh3gk4kz4
GET https://markdownregistry.com/api/v1/resolve?ref=vellum-ai/vellum-assistant/plugin-builder
GET https://markdownregistry.com/api/v1/blob/8e06fcc41a4f61953fa745c9e1eeac8c5d80cbde89395c31ac5dcf18dd51ec27