Use Skill Up CLI

Capture and review Agent Skill observations, and create, run, diagnose, or iteratively improve Skill evaluations (evals) with the skill-up…

Context cost
15.7k tokensestimated from the bundle, loaded when it triggers
Bundle
22 of 23 fileshanded out here; the rest is at its source
Licence
Apache-2.0the author’s own terms
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Capture and review Agent Skill observations, and create, run, diagnose, or iteratively improve Skill evaluations (evals) with the skill-up CLI. Use when the user asks to record explicitly attributed Skill usage or feedback; review observations; turn an approved observation into a regression case; evaluate, test, regress, verify, fix, improve, iterate, or evolve a Skill; add or strengthen eval cases; write eval.yaml/case.yaml; run skill-up run/validate/list-cases/report/import/init; or migrate from Anthropic evals.json.

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

agentsecuritytesting

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md16.3 kB · preview
--- name: skill-upper ---
6# use-skill-up-cli
7
8Help the user evaluate and evolve Agent Skills through the skill-up CLI.
9
10Manual: <https://alibaba.github.io/skill-up/>
11
12## Language Policy
13
14**Default to English when responding to the user. If the user writes in Chinese (or any other language), switch to that language and stay consistent with the user's input throughout the session.**
15
16Detection rules (highest priority first):
17
181. The user explicitly specifies a language in the current message (e.g. "answer in English" or "reply in Chinese") → follow the user's instruction.
192. The natural language used in the user's current message → match it.
203. None of the above → use English (default).
21
22Regardless of the response language, technical identifiers in this SKILL — CLI commands, eval.yaml / case.yaml field names, report field names, etc. — MUST stay in their original English form. Do not translate them.
23
24### Language Rules for Generated Artifacts
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md2,169 words
Files22
LicenceApache-2.0
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈180
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
15,495
on trigger
The instruction body and 21 supporting files, read only when the skill fires.
7.8%
of a 200k window
Ten skills this size would take about 78% of the window before you open a file.
050k100k150k200k context window

15.7k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

The download carries 22 of the 23 files in its source folder; the list here names 22 files, 67.6 kB on disk. Mostly text — the instructions the model reads — with 1 script in it that your client would run only if the instructions tell it to. The other one is not in the download — listed after these, with why.

  • SKILL.md16.3 kB
  • README.md1.7 kB
  • README.zh.md1.5 kB
  • assets/case.yaml.tmpl2.7 kB
  • assets/eval.yaml.tmpl2.9 kB
  • evals/eval.yaml0.8 kB
  • references/case-yaml.md3.9 kB
  • references/cli.md5.6 kB
  • references/eval-yaml.md7.0 kB
  • references/install.md5.7 kB
  • references/judge-types.md3.1 kB
  • references/migrate-anthropic.md2.1 kB
  • evals/cases/add-case-to-existing.yaml1.1 kB
  • evals/cases/english-context-generates-english-only-cases.yaml0.9 kB
  • evals/cases/evolve-existing-skill.yaml1.4 kB
  • evals/cases/scaffold-new-evals.yaml1.6 kB
  • evals/cases/scaffold-with-qodercli-engine.yaml1.4 kB
  • evals/cases/scaffold-with-script-judge.yaml1.3 kB
  • evals/fixtures/scripts/assert-english-only-generated-cases.sh4.9 kB
  • evals/fixtures/skills/sample-no-evals/SKILL.md0.8 kB
  • evals/fixtures/skills/sample-with-evals/SKILL.md0.6 kB
  • evals/fixtures/skills/sample-with-evals/evals/eval.yaml0.3 kB

Not in the download

Too deep is past six folders. Take it from its source.

  • evals/fixtures/skills/sample-with-evals/evals/cases/add-todo.yamltoo deep
What is not in it

A skill installs nothing and depends on nothing: it is a folder your client reads. This one carries 1 script beside the text, so the download is 22 files — not the whole of its source: 1 file is left out. It is listed under the files, with why. The Apache-2.0 licence covers the templates and examples as well as the instructions.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# Use Skill Up CLI · 15.7k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/use-skill-up-cli/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/use-skill-up-cli" ] && { [ ! -e .claude/skills/use-skill-up-cli ] || { mv .claude/skills/use-skill-up-cli "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/use-skill-up-cli" .claude/skills/ && echo "Installed .claude/skills/use-skill-up-cli"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add alibaba/use-skill-up-cli

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/use-skill-up-cli/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/use-skill-up-cli/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/use-skill-up-cli" ] && { [ ! -e ~/.claude/skills/use-skill-up-cli ] || { mv ~/.claude/skills/use-skill-up-cli "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/use-skill-up-cli" ~/.claude/skills/ && echo "Installed ~/.claude/skills/use-skill-up-cli" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/use-skill-up-cli/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where. It appears as skill-upper in Gemini CLI, Codex, Copilot and Grok (its own name); Claude Code lists it by the folder name, use-skill-up-cli. Not in this download: 1 file of its source (which one, and why). Take it from its source.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referencealibaba/use-skill-up-cli

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

Reviews

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