Test rigor Agent Skill

The evidence standard for any QA work — visual, functional, regression, performance, accessibility, or mobile.

Context cost
1.9k tokensestimated from the bundle, loaded when it triggers
Bundle
2 files · 7.6 kBtext throughout, nothing executable
Licence
CC-BY-4.0the author’s own terms
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

The evidence standard for any QA work — visual, functional, regression, performance, accessibility, or mobile. Establishes what counts as proof, how to capture a baseline BEFORE changing anything, how to pair before/after when state drifts, and how to write a verdict that does not overclaim. Use whenever verifying a change works, before claiming something is done or fixed, when writing a verification plan, or when a test passes but you have not seen the thing actually work.

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.

accessibilityperformancesecuritytesting

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.md5.9 kB · preview
--- name: test-rigor ---
6# Test rigor
7
8One rule underneath everything: **a claim without evidence is not a result.**
9
10"It should work now", "the tests pass so it's fine", "this will improve load time" — none of these
11are findings. A finding is something you observed, with an artifact someone else could go look at.
12
13This skill is the general standard. For before/after performance numbers specifically, use the
14**perf-proof** skill, which implements this standard for that case.
15
16## The four failure modes this exists to prevent
17
181. **Assumed, not observed.** Reasoning about what the code will do instead of running it.
192. **No baseline.** Changing the thing first, then having nothing to compare against. This is the
20 most common and least recoverable — once you have edited, the "before" is gone.
213. **Wrong altitude.** A green unit test proving a function returns the right value while the
22 feature is broken end to end, because the bug lives in auth bootstrap or cross-entity fetching.
234. **Single sample.** One run, one screenshot, one state — presented as though it characterises
24 behaviour.
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md1,008 words
Files2
LicenceCC-BY-4.0
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.

≈130
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
1,770
on trigger
The instruction body and 1 supporting file, read only when the skill fires.
0.95%
of a 200k window
Ten skills this size would take about 10% of the window before you open a file.
050k100k150k200k context window

1.9k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Middling. Fine to keep on in a project where you use it weekly, worth unloading in one where you never do.

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

2 files, 7.6 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md5.9 kB
  • references/called-deeweb.md1.7 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 2 files you can review in full before installing. The CC-BY-4.0 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.

# Test rigor · 1.9k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/test-rigor/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/test-rigor" ] && { [ ! -e .claude/skills/test-rigor ] || { mv .claude/skills/test-rigor "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/test-rigor" .claude/skills/ && echo "Installed .claude/skills/test-rigor"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add loktar00/test-rigor

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/test-rigor/ 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/test-rigor/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/test-rigor" ] && { [ ! -e ~/.claude/skills/test-rigor ] || { mv ~/.claude/skills/test-rigor "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/test-rigor" ~/.claude/skills/ && echo "Installed ~/.claude/skills/test-rigor" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/test-rigor/ 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.

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
Referenceloktar00/test-rigor

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.

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