Loading skill
Install any skill in seconds. Free to start, no credit card required.
Get Started Free →vellum-ai/vellum-skill-authoring
Author and review first-party Vellum skills in the repository.
Passed 20 of 22 test cases with the skill, and 13 of 22 without it.
and 7 more in the full report
7 fixed13 passed either way2 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 7 test cases the skill fixed. Same model, same prompt, with and without the skill.
I updated the Pydantic input contract models and regenerated the manifest schema for an existing skill. What verification step should I run in addition to unit tests?
| Checked | Without skill | With skill |
|---|---|---|
| The response requires running typechecks when contract models change. | Missed | Passed |
The instructions your model reads when the skill loads.
Use this for Vellum runtime skills in skills/ and bundled assistant skills, not for Cursor Agent Skills under .cursor/skills/.
skills/ must not import from assistant/.assistant/ must not import from skills/.Skill instructions should be concise and operational:
When a skill adds scripts or tools:
When adding or renaming skills, check the relevant catalog, manifest, bundled registry, or packaging path used by the runtime. Do not assume a SKILL.md file alone makes the skill available to users.
test cases passed, vs 13 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.