Agent skill

Use Test Fixtures

A skill your agent uses when a Rust or MASM test needs to construct an account, note, transaction, or other domain object — build it with the existing test fixtures.

MITAuto-check passedTesting & QA

Install Use Test Fixtures

skills CLI

$ npx skills add 0xMiden/protocol --skill use-test-fixtures -a claude-code

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

GitHub CLI

$ gh skill install 0xMiden/protocol use-test-fixtures --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/0xMiden/protocol.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/use-test-fixtures .claude/skills/use-test-fixtures && 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/

Paste into Claude Code

Install the "use-test-fixtures" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-test-fixtures into .claude/skills/use-test-fixtures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-test-fixtures", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-test-fixtures

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add 0xMiden/protocol --skill use-test-fixtures -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install 0xMiden/protocol use-test-fixtures --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/use-test-fixtures .agents/skills/use-test-fixtures && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "use-test-fixtures" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-test-fixtures into .agents/skills/use-test-fixtures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-test-fixtures", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add 0xMiden/protocol --skill use-test-fixtures -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install 0xMiden/protocol use-test-fixtures --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/use-test-fixtures .cursor/skills/use-test-fixtures && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "use-test-fixtures" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-test-fixtures into .cursor/skills/use-test-fixtures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-test-fixtures", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/0xMiden/protocol.git --path .claude/skills/use-test-fixtures

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add 0xMiden/protocol --skill use-test-fixtures -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install 0xMiden/protocol use-test-fixtures --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/use-test-fixtures .gemini/skills/use-test-fixtures && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "use-test-fixtures" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-test-fixtures into .gemini/skills/use-test-fixtures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-test-fixtures", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install 0xMiden/protocol use-test-fixtures

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add 0xMiden/protocol --skill use-test-fixtures -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/use-test-fixtures .github/skills/use-test-fixtures && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "use-test-fixtures" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-test-fixtures into .github/skills/use-test-fixtures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-test-fixtures", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add 0xMiden/protocol --skill use-test-fixtures -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install 0xMiden/protocol use-test-fixtures --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/use-test-fixtures .opencode/skills/use-test-fixtures && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "use-test-fixtures" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-test-fixtures into .opencode/skills/use-test-fixtures/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-test-fixtures", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: use-test-fixtures
GitHub stars: 133
Token cost: ~377 tokens
SKILL.md length: 112 words
Files: 1
Skills in repo: 35
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

A skill your agent uses when a Rust or MASM test needs to construct an account, note, transaction, or other domain object — build it with the existing test fixtures.

MASM test needs to construct an account
SKILL.md covers Rule, Why and Examples
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Other domain object — build it with the existing test fixtures

What it does

Use Test Fixtures is an agent skill from 0xMiden/protocol. Use when a Rust or MASM test needs to construct an account, note, transaction, or other domain object — build it with the existing test fixtures.

Its SKILL.md is about 380 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. It works with Rust. The repository describes itself as: Core components of the Miden protocol. The licence is MIT.

When your agent uses it

MASM test needs to construct an account
Other domain object — build it with the existing test fixtures

Example prompts

“/use-test-fixtures”

What it can do on your machine

Read from SKILL.md and the folder at commit 62b59ec. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
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 rust).
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

Use Test Fixtures loads about 377 tokens when it runs. Until then it costs about 41 tokens; SKILL.md has 112 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~41
When it runs · the whole SKILL.md, loaded when a task matches: ~377

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 passed

The automated check found no risky patterns in SKILL.md.

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

The full file from 0xMiden/protocol at commit 62b59ec, republished under its MIT licence (© 0xMiden). 112 words, ~377 tokens.

Download SKILL.mdSave it as .claude/skills/use-test-fixtures/SKILL.md (or your agent's skills folder).

name: use-test-fixtures
description: Use when a Rust or MASM test needs to construct an account, note, transaction, or other domain object — build it with the existing test fixtures.

Use Existing Test Fixtures, Don't Hand-Roll

Rule

When a test needs a domain object, reach for the existing fixture infrastructure:

Notes: NoteBuilder.
Scripts: ScriptBuilder.
Account IDs: AccountIdBuilder (or the existing ACCOUNT_ID_* constants).
Random felts/words: rand_value() (deterministic seed-driven RNG).
Accounts: AccountBuilder with the testing feature.

Don't write a new AccountId::dummy(...), Note::test_only(...), or one-off random helper. If the existing fixtures can't express what you need, extend them — don't fork.

Why

Shared fixtures encode the domain's validation rules, so a fixture-built object has the right bits and survives serialization; a hand-rolled dummy() usually doesn't, letting tests pass against invariants the real code never enforces. Reusing fixtures also lets one upgrade propagate to every test.

Examples

rust

// Good
let note = NoteBuilder::new()
    .recipient(test_recipient())
    .with_asset(rand_value())
    .build()?;

let account_id = AccountIdBuilder::new().build();

// Bad
let note = Note {
    metadata: NoteMetadata::default(),
    inputs: NoteInputs::default(),
    assets: NoteAssets::default(),
    recipient: NoteRecipient::dummy(),
};

let account_id = AccountId::try_from(Word::default()).unwrap();

Files

Just SKILL.md in .claude/skills/use-test-fixtures of 0xMiden/protocol.

Open the folder on GitHubat commit 62b59ec

Compare with similar skills

Use Test Fixtures 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.

Use Test Fixtures compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Use Test Fixtures this skill0xMiden/protocol	133	—	~377	Automated safety check: Pass	MIT	yesterday
RTK Filter TDD in Rustrtk-ai/rtk	83k	—	~1.9k	Automated safety check: Notes	Apache-2.0	yesterday
OpenLogi Device Fixture ContributionAprilNEA/OpenLogi	23k	—	~1.2k	Automated safety check: Pass	Apache-2.0	today
Testing Strategiesancoleman/ai-design-components	525	—	~3.8k	Automated safety check: Pass	MIT	10 mo ago
Jest Testing PatternsChrisWiles/claude-code-showcase	6.1k	7 repos	~1.5k	Automated safety check: Pass	None	9 mo ago
Rust TDD Workflowrtk-ai/rtk	83k	—	~753	Automated safety check: Notes	Apache-2.0	yesterday

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Keep PR and issue descriptions short and decision-focused. An agent skill from 0xMiden/protocol.
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Conversion Method Naming
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A skill your agent uses when naming a conversion or accessor method in Rust — follow the Rust API naming conventions for the method's cost and ownership.
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Decouple Component From Storage
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Works with

Rust

Questions about Use Test Fixtures

What does Use Test Fixtures do?

A skill your agent uses when a Rust or MASM test needs to construct an account, note, transaction, or other domain object — build it with the existing test fixtures. Use Test Fixtures is an agent skill from 0xMiden/protocol. Use when a Rust or MASM test needs to construct an account, note, transaction, or other domain object — build it with the existing test fixtures.

When should I use Use Test Fixtures?

Use Test Fixtures fits situations like: MASM test needs to construct an account; other domain object — build it with the existing test fixtures.

How do I install Use Test Fixtures in Claude Code?

Run `npx skills add 0xMiden/protocol --skill use-test-fixtures -a claude-code`. Or copy the skill folder (.claude/skills/use-test-fixtures in 0xMiden/protocol) into .claude/skills/use-test-fixtures in your project. Claude Code loads it when a task matches its description.

How do I install Use Test Fixtures in Codex?

Run `npx skills add 0xMiden/protocol --skill use-test-fixtures -a codex`. Or copy the skill folder (.claude/skills/use-test-fixtures in 0xMiden/protocol) into .agents/skills/use-test-fixtures in your project. Codex loads it when a task matches its description.

Can I use Use Test Fixtures 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 0xMiden/protocol --skill use-test-fixtures -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/use-test-fixtures, .gemini/skills/use-test-fixtures, .github/skills/use-test-fixtures and .opencode/skills/use-test-fixtures in your project.

What does Use Test Fixtures need to run?

SKILL.md names no scripts, command-line tools or credentials: Use Test Fixtures is instructions for the agent only.

Does Use Test Fixtures 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 Use Test Fixtures safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Use Test Fixtures use?

Use Test Fixtures is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Use Test Fixtures use?

About 377 tokens (SKILL.md is roughly 1.5k 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 Use Test Fixtures?

Skills that share tags, products or a category with Use Test Fixtures: RTK Filter TDD in Rust (rtk-ai/rtk, 83k stars), OpenLogi Device Fixture Contribution (AprilNEA/OpenLogi, 23k stars), Testing Strategies (ancoleman/ai-design-components, 525 stars) and Jest Testing Patterns (ChrisWiles/claude-code-showcase, 6.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Use Test Fixtures?

0xMiden (a GitHub organization) maintains it in 0xMiden/protocol, which has 133 GitHub stars. The repository holds 35 skills in this directory. The repository was last updated on October 9, 2026.

Source: 0xMiden/protocol on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Use Test Fixtures

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Use Existing Test Fixtures, Don't Hand-Roll

Rule

Why

Examples

Files

Compare with similar skills

Similar skills

More from 0xMiden/protocol

Related

Questions about Use Test Fixtures