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Skill Management · vellum-ai | DecimalAI

agent toolingby vellum-ai

Skill Management

vellum-ai/skill-management

Source vellum-ai/vellum-assistant ↗License MIT

Create, edit, and delete custom managed skills in the user's workspace.

SkillScore68Maintained

Automatic

AI Engineer pack

Last verified 8/4/2026

What it changes

Passed 12 of 18 test cases with the skill, and 6 of 18 without it.

Without skill32%

With skill68%

Checks it passed that the model alone missed

Starts the body content with an explicit Level 2 heading titled When to Use
Uses the placeholder syntax with curly braces around baseDir to reference the script location
Specifies that a valid SKILL.md file must exist directly at the top level of the skill directory

and 5 more in the full report

8 fixed7 passed either way7 still failing0 broke

Pass-rate lift: +36 pp
Tokens: +32%
Agent turns: 0%
Response time: -56%

Model gemini-3.6-flashMeasured 8/4/2026v115 of 22 cases passed with skill · 18 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/vellum-ai-skill-management/SKILL.md https://app.decimal.ai/s/vellum-ai-skill-management/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add vellum-ai-skill-management, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/vellum-ai-skill-management/ and pins it in .decimal/skills.lock

decimalai skills add vellum-ai-skill-management

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/vellum-ai-skill-management/SKILL.md https://app.decimal.ai/s/vellum-ai-skill-management/SKILL.md

Raw file: /s/vellum-ai-skill-management/SKILL.md ↗ · machine-readable summary at /s/vellum-ai-skill-management.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 8

Prompt

What file must exist at the top level of a skill directory for the skill loading system to register it?

What was checked, without and with the skill
Checked	Without skill	With skill
Specifies that a valid SKILL.md file must exist directly at the top level of the skill directory	Missed	Passed

case-20 · gemini-3.6-flash · 8/4/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md112 linessingle file

Manage the lifecycle of custom managed skills in {workspaceDir}/skills.

When to Use

USE THIS SKILL WHEN:

The user says "build me a skill" or "create a skill for X"
The user wants to scaffold, edit, or delete a SKILL.md in their workspace
The user wants a repeatable workflow captured as an invocable skill

Do NOT use this skill when the user just wants to run an existing skill. That is normal activation, not management.

Capabilities

Scaffold a new managed skill with YAML frontmatter and markdown body
Edit an existing skill by scaffolding over it (rewrites the SKILL.md in place)
Delete an existing managed skill directory

Skills created via scaffold_managed_skill become available for skill_load when a valid top-level SKILL.md is written under the skill directory.

Step 1 - Align with the user before building

Ask before doing anything. Do not scaffold a skill until you have confirmed with the user:

What the skill should do
When it should activate (the trigger phrases, in their words)
The major steps it performs
Any destructive steps and the done condition

✓ Checkpoint: Have you confirmed scope with the user? If you are guessing at any of the four points above, ask first. Do not scaffold on assumption.

Step 2 - Write a description AND activation-hints, always both

The description is what makes the skill discoverable. It must cover both what the skill does and when to reach for it, phrased the way the user would say it.

description: Build anything visual — apps, landing pages, dashboards, trackers,
  calculators, games, tools, slide decks, or data visualizations. Use whenever
  the user wants something built that they can see and interact with.

Track record

Benchmark

12 / 18

test cases passed, vs 6 / 18 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/1/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

vellum-ai / vellum-assistant

assistant/src/config/bundled-skills/skill-management/SKILL.md

View on GitHub ↗

License MITImported 8/1/2026Version v1

More skills from the same source and nearby in the registry, with their headline benchmark lift.