vellum-skill-authoring SKILL.md skillA
vellum-skill-authoring from vellum-ai/vellum-assistant is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add vellum-ai/vellum-assistant/vellum-skill-authoring@git:20260521.b4bdd7aPins git:20260521.b4bdd7a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- vellum-ai/vellum-assistant
- Path
.cursor/skills/vellum-skill-authoring/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260521.b4bdd7a, committed May 21, 2026
- Size
- 1,878 bytes
- Repository stars
- 1,467
- License
- MIT
Author and review first-party Vellum skills in the repository. Use when editing files under skills/, assistant bundled skills, skill manifests, tool definitions, SKILL.md files, or first-party skill portability and isolation behavior.
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
# Vellum Skill Authoring ## Scope Use this for Vellum runtime skills in `skills/` and bundled assistant skills, not for Cursor Agent Skills under `.cursor/skills/`. ## Core Constraints - First-party skills must be portable and isolated. - `skills/` must not import from `assistant/`. - `assistant/` must not import from `skills/`. - Prefer skill processes and supported contracts over new daemon tool registrations. - Avoid secrets, real personal data, and machine-specific paths in skill docs, tests, and fixtures. ## SKILL.md Quality Bar Skill instructions should be concise and operational: - State what the skill does and when to use it. - Prefer concrete steps over broad advice. - Keep user-facing terminology consistent. - Use generic examples only. - Avoid requiring hidden local state unless setup instructions create it. ## Tool And Script Review When a skill adds scripts or tools: 1. Verify tool input/output contracts are explicit. 2. Check error handling and user-facing messages. 3. Confirm scripts can run in the skill process environment. 4. Avoid direct imports across isolation boundaries. 5. Add focused tests for parsing, contract handling, and failure cases. …
Read the whole file at its exact version.
How to install
mdr add vellum-ai/vellum-assistant/vellum-skill-authoring@sha256:3c8e1f7f8d13544dThe line at the top of this page pins the label git:20260521.b4bdd7a, 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_tknsvnjkruio47xd)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on May 21, 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 (1878 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
vellum-ai/vellum-assistant · 1,467 stars · license MIT · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_tknsvnjkruio47xd GET https://markdownregistry.com/api/v1/resolve?ref=vellum-ai/vellum-assistant/vellum-skill-authoring GET https://markdownregistry.com/api/v1/blob/3c8e1f7f8d13544d80a11e54f789afb5a41a48aa780874b78c7dda35b93202d3
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.