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Agent skill

Domain Newtypes Over Primitives

by 0xMiden in 0xMiden/protocol

A skill your agent uses when introducing API parameters, struct fields, or return types that carry a domain value — represent them with a domain newtype that enforces their invariants.

MITAuto-check passedDevelopment

Install Domain Newtypes Over Primitives

skills CLI
$ npx skills add 0xMiden/protocol --skill domain-newtypes-over-primitives -a claude-code

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

GitHub CLI
$ gh skill install 0xMiden/protocol domain-newtypes-over-primitives --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/domain-newtypes-over-primitives .claude/skills/domain-newtypes-over-primitives && 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
domain-newtypes-over-primitives
GitHub stars
133
Token cost
~401 tokens
SKILL.md length
116 words
Files
1
Skills in repo
35
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when introducing API parameters, struct fields, or return types that carry a domain value — represent them with a domain newtype that enforces their invariants.

  • Introducing API parameters
  • SKILL.md covers Rule, Why and Examples
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Return types that carry a domain value — represent them with a domain newtype that enforces their invariants

What it does

Domain Newtypes Over Primitives is an agent skill from 0xMiden/protocol. Use when introducing API parameters, struct fields, or return types that carry a domain value — represent them with a domain newtype that enforces their invariants.

Its SKILL.md is about 400 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 Development. The repository describes itself as: Core components of the Miden protocol. The licence is MIT.

When your agent uses it

  • Introducing API parameters
  • Return types that carry a domain value — represent them with a domain newtype that enforces their invariants

Example prompts

  • “/domain-newtypes-over-primitives”

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

Domain Newtypes Over Primitives loads about 401 tokens when it runs. Until then it costs about 49 tokens; SKILL.md has 116 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~49
When it runs · the whole SKILL.md, loaded when a task matches
~401

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). 116 words, ~401 tokens.

Download SKILL.mdSave it as .claude/skills/domain-newtypes-over-primitives/SKILL.md (or your agent's skills folder).
name
domain-newtypes-over-primitives
description
Use when introducing API parameters, struct fields, or return types that carry a domain value — represent them with a domain newtype that enforces their invariants.

Use Domain Newtypes, Not Raw Primitives

Rule

When an API boundary takes or returns a value with a domain meaning, define a newtype that:

  • Validates the value at construction time (see validate-in-constructor).
  • Exposes the inner representation only through deliberate accessors.
  • Is used at every API boundary touching the concept (not raw u64/Word/tuples).

Raw (AccountId, u64) tuples, bare Word parameters, and primitive-typed amounts must be replaced with a named type like FungibleAsset, FaucetId, BlockNumber.

Why

A newtype is the one place an invariant gets enforced; once a function takes a raw u64 for an amount, every caller and reviewer must re-check the bound. It also localizes representation changes to a single type instead of every signature.

Examples

rust
// Good
pub fn mint(asset: FungibleAsset, to: AccountId) -> Result<Receipt, Error>;

// Bad
pub fn mint(faucet_id: AccountId, amount: u64, to: AccountId) -> Result<Receipt, Error>;
rust
// Good: validated wrapper with explicit constructor
pub struct BlockNumber(u32);
impl BlockNumber {
    pub fn new(n: u32) -> Result<Self, Error> {
        if n > MAX_BLOCK_NUMBER { return Err(Error::OutOfRange); }
        Ok(Self(n))
    }
}

// Bad: raw u32 leaks into every signature, every caller checks the bound
pub fn lookup_block(n: u32) -> Option<Block>;

© 0xMiden, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .claude/skills/domain-newtypes-over-primitives of 0xMiden/protocol.

Open the folder on GitHubat commit 62b59ec

Compare with similar skills

Domain Newtypes Over Primitives 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.

Domain Newtypes Over Primitives compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Domain Newtypes Over Primitives this skill0xMiden/protocol133—~401Automated safety check: PassMIT
Vercel Composition Patternssupabase/supabase111k58 repos~726Automated safety check: PassMIT
Finishing a Development Branchobra/superpowers297k5 repos~1.9kAutomated safety check: PassMIT
Typescript Advanced Typesrolling-scopes/rsschool-app10k25 repos~4.2kAutomated safety check: PassMPL-2.0
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k4 repos~1.1kAutomated safety check: PassMIT

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Categories

Questions about Domain Newtypes Over Primitives

What does Domain Newtypes Over Primitives do?

A skill your agent uses when introducing API parameters, struct fields, or return types that carry a domain value — represent them with a domain newtype that enforces their invariants. Domain Newtypes Over Primitives is an agent skill from 0xMiden/protocol. Use when introducing API parameters, struct fields, or return types that carry a domain value — represent them with a domain newtype that enforces their invariants.

When should I use Domain Newtypes Over Primitives?

Domain Newtypes Over Primitives fits situations like: introducing API parameters; return types that carry a domain value — represent them with a domain newtype that enforces their invariants.

How do I install Domain Newtypes Over Primitives in Claude Code?

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

How do I install Domain Newtypes Over Primitives in Codex?

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

Can I use Domain Newtypes Over Primitives 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 domain-newtypes-over-primitives -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/domain-newtypes-over-primitives, .gemini/skills/domain-newtypes-over-primitives, .github/skills/domain-newtypes-over-primitives and .opencode/skills/domain-newtypes-over-primitives in your project.

What does Domain Newtypes Over Primitives need to run?

SKILL.md names no scripts, command-line tools or credentials: Domain Newtypes Over Primitives is instructions for the agent only.

Does Domain Newtypes Over Primitives 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 Domain Newtypes Over Primitives 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 Domain Newtypes Over Primitives use?

Domain Newtypes Over Primitives 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 Domain Newtypes Over Primitives use?

About 401 tokens (SKILL.md is roughly 1.6k 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 Domain Newtypes Over Primitives?

Skills that share tags, products or a category with Domain Newtypes Over Primitives: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Domain Newtypes Over Primitives?

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.