Agent skill

Test Data Factory

by gustavscirulis in gustavscirulis/snapgrid

Generate test fixture factories for your models. An agent skill from gustavscirulis/snapgrid.

Custom licenceAuto-check: notesTesting & QA

Install Test Data Factory

skills CLI
$ npx skills add gustavscirulis/snapgrid --skill test-data-factory -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install gustavscirulis/snapgrid test-data-factory --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/gustavscirulis/snapgrid.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/skills/testing/test-data-factory .claude/skills/test-data-factory && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
test-data-factory
GitHub stars
117
Used in
1 other repo
Token cost
~2.4k tokens
SKILL.md length
246 words
Files
1
Skills in repo
118
Repo updated
First seen
Licence
Custom licence

At a glance

Generate test fixture factories for your models. An agent skill from gustavscirulis/snapgrid.

  • Works in 5 steps: Discover Models → Choose Factory Pattern → Generate Factories → …
  • Tests need sample data setup
  • SKILL.md covers When This Skill Activates, Why Test Factories, Process and Factory Design Rules, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Test Data Factory is an agent skill from gustavscirulis/snapgrid. Generate test fixture factories for your models. Builder pattern and static factories for zero-boilerplate test data. Use when tests need sample data setup.

Its SKILL.md is about 2.4k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Testing & QA, covering Test data and fixtures, Project scaffolding and Test generation. The repository describes itself as: SnapGrid is an open-source Mac app for collecting, organizing, and analyzing UI screenshots. It uses AI to automatically detect UI components and patterns, making it a powerful…

When your agent uses it

  • Tests need sample data setup
  • Tasks that involve Test data and fixtures
  • Tasks that involve Project scaffolding

Example prompts

  • “/test-data-factory”

Requirements

  • Pre-approved tools (allowed-tools): Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion

Workflow steps

5 steps, taken from the step headings in SKILL.md.

  1. Discover Models
  2. Choose Factory Pattern
  3. Generate Factories
  4. Generate Date/Time Helpers
  5. Generate Mock Response Factories

What it can do on your machine

Read from SKILL.md and the folder at commit eb7eaf4. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Write
    • Edit
    • Glob
    • Grep
    • Bash
    • AskUserQuestion

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are swift and markdown).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Test Data Factory loads about 2.4k tokens when it runs. Until then it costs about 44 tokens; SKILL.md has 246 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~44
When it runs · the whole SKILL.md, loaded when a task matches
~2.4k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 246 words (~2,425 tokens).

“Generate factory helpers that make creating test data effortless. Eliminates boilerplate in test setup so writing tests has zero friction.”

— opening of SKILL.md by gustavscirulis, Custom licence
name
test-data-factory
allowed-tools
Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/skills/testing/test-data-factory of gustavscirulis/snapgrid.

Open the folder on GitHubat commit eb7eaf4

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in gustavscirulis/snapgrid, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Test Data Factory next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Test Data Factory compared with similar skills
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Test Data Factory this skillgustavscirulis/snapgrid1171 repos~2.4kAutomated safety check: NotesCustom licence
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Eval Designagentscope-ai/OpenJudge870—~2.8kAutomated safety check: WarnApache-2.0
Wjttc Buildersickn33/agentic-awesome-skills47k1 repos~3.3kAutomated safety check: PassMIT
Platform Data Manageforcedotcom/sf-skills1.1k—~2.7kAutomated safety check: PassApache-2.0
Frappe Testing UnitImpertio-Studio/Frappe_Claude_Skill_Package188—~3kAutomated safety check: PassMIT

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Categories

Questions about Test Data Factory

What does Test Data Factory do?

Generate test fixture factories for your models. An agent skill from gustavscirulis/snapgrid. Test Data Factory is an agent skill from gustavscirulis/snapgrid. Generate test fixture factories for your models.

When should I use Test Data Factory?

Test Data Factory fits situations like: tests need sample data setup; tasks that involve Test data and fixtures; tasks that involve Project scaffolding.

How do I install Test Data Factory in Claude Code?

Run `npx skills add gustavscirulis/snapgrid --skill test-data-factory -a claude-code`. Or copy the skill folder (.claude/skills/skills/testing/test-data-factory in gustavscirulis/snapgrid) into .claude/skills/test-data-factory in your project. Claude Code loads it when a task matches its description.

How do I install Test Data Factory in Codex?

Run `npx skills add gustavscirulis/snapgrid --skill test-data-factory -a codex`. Or copy the skill folder (.claude/skills/skills/testing/test-data-factory in gustavscirulis/snapgrid) into .agents/skills/test-data-factory in your project. Codex loads it when a task matches its description.

Can I use Test Data Factory in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add gustavscirulis/snapgrid --skill test-data-factory -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/test-data-factory, .gemini/skills/test-data-factory, .github/skills/test-data-factory and .opencode/skills/test-data-factory in your project.

What does Test Data Factory need to run?

SKILL.md names no scripts, command-line tools or credentials: Test Data Factory is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Write, Edit, Glob, Grep, Bash, AskUserQuestion.

Does Test Data Factory access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Test Data Factory safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Test Data Factory use?

Test Data Factory has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Test Data Factory use?

About 2.4k tokens (SKILL.md is roughly 9.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Test Data Factory?

Skills that share tags, products or a category with Test Data Factory: Veomni Patchgen Model (ByteDance-Seed/VeOmni, 2.2k stars), Eval Design (agentscope-ai/OpenJudge, 870 stars), Wjttc Builder (sickn33/agentic-awesome-skills, 47k stars) and Platform Data Manage (forcedotcom/sf-skills, 1.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Test Data Factory?

gustavscirulis (a GitHub user) maintains it in gustavscirulis/snapgrid, which has 117 GitHub stars. The repository holds 118 skills in this directory. The repository was last updated on April 30, 2026.

Source: gustavscirulis/snapgrid on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.