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Agent skill

Non Exhaustive Public Types

by 0xMiden in 0xMiden/protocol

A skill your agent uses when defining a public enum or struct in a library crate that may gain variants or fields later — keep future additions from being breaking changes.

MITAuto-check passedDevelopment

Install Non Exhaustive Public Types

skills CLI
$ npx skills add 0xMiden/protocol --skill non-exhaustive-public-types -a claude-code

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

GitHub CLI
$ gh skill install 0xMiden/protocol non-exhaustive-public-types --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/non-exhaustive-public-types .claude/skills/non-exhaustive-public-types && 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
non-exhaustive-public-types
GitHub stars
133
Token cost
~545 tokens
SKILL.md length
128 words
Files
1
Skills in repo
35
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when defining a public enum or struct in a library crate that may gain variants or fields later — keep future additions from being breaking changes.

  • Defining a public enum
  • SKILL.md covers Rule, Why and Examples
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Struct in a library crate that may gain variants

What it does

Non Exhaustive Public Types is an agent skill from 0xMiden/protocol. Use when defining a public enum or struct in a library crate that may gain variants or fields later — keep future additions from being breaking changes.

Its SKILL.md is about 550 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

  • Defining a public enum
  • Struct in a library crate that may gain variants
  • Fields later — keep future additions from being breaking changes

Example prompts

  • “/non-exhaustive-public-types”

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

Non Exhaustive Public Types loads about 545 tokens when it runs. Until then it costs about 46 tokens; SKILL.md has 128 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~46
When it runs · the whole SKILL.md, loaded when a task matches
~545

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). 128 words, ~545 tokens.

Download SKILL.mdSave it as .claude/skills/non-exhaustive-public-types/SKILL.md (or your agent's skills folder).
name
non-exhaustive-public-types
description
Use when defining a public `enum` or `struct` in a library crate that may gain variants or fields later — keep future additions from being breaking changes.

Mark Public Types #[non_exhaustive]

Rule

Public enums and public-fielded structs in library crates whose variants/fields are expected to grow should be marked #[non_exhaustive]:

rust
#[non_exhaustive]
pub enum Authority {
    AuthControlled,
    OwnerControlled,
    RbacControlled { role: RoleSymbol },
}

#[non_exhaustive]
pub struct Header {
    pub version: u8,
    pub flags: u32,
}

This forces external code to use a wildcard match arm (or default field syntax) and lets the library add new variants/fields in a minor release without breaking downstreams.

Don't mark types #[non_exhaustive] when the closed set is part of the contract — e.g. NoteType, a protocol-level enum fixed by the spec and serialized with a fixed-width discriminant, where adding a variant is a breaking protocol change anyway.

Why

Without #[non_exhaustive], a downstream exhaustive match or struct literal compiles today but breaks the moment a minor release adds a variant or field. The attribute makes the wildcard arm mandatory, turning those additions from breaking to non-breaking.

Examples

rust
// Good: a standards-level enum that is expected to gain variants over time
#[non_exhaustive]
pub enum TransferPolicy {
    AllowAll,
    Blocklist,
    Allowlist { allow_list: AllowlistStorage },
    Custom(AccountProcedureRoot),
}

// External callers are forced to include a wildcard, so a future variant
// (e.g. a time-locked or volume-limited policy) stays non-breaking:
match policy {
    TransferPolicy::AllowAll => ...,
    TransferPolicy::Blocklist => ...,
    TransferPolicy::Allowlist { .. } => ...,
    TransferPolicy::Custom(_) => ...,
    _ => ...,   // adding a variant in a minor release: still compiles
}

// Bad: closed public enum, so any new transfer policy is a breaking change
pub enum TransferPolicy {
    AllowAll,
    Blocklist,
    Allowlist { allow_list: AllowlistStorage },
    Custom(AccountProcedureRoot),
}

© 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/non-exhaustive-public-types of 0xMiden/protocol.

Open the folder on GitHubat commit 62b59ec

Compare with similar skills

Non Exhaustive Public Types 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.

Non Exhaustive Public Types compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Non Exhaustive Public Types this skill0xMiden/protocol133—~545Automated safety check: PassMIT
Vercel Composition Patternssupabase/supabase111k58 repos~726Automated safety check: PassMIT
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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 Non Exhaustive Public Types

What does Non Exhaustive Public Types do?

A skill your agent uses when defining a public enum or struct in a library crate that may gain variants or fields later — keep future additions from being breaking changes. Non Exhaustive Public Types is an agent skill from 0xMiden/protocol. Use when defining a public enum or struct in a library crate that may gain variants or fields later — keep future additions from being breaking changes.

When should I use Non Exhaustive Public Types?

Non Exhaustive Public Types fits situations like: defining a public enum; struct in a library crate that may gain variants; fields later — keep future additions from being breaking changes.

How do I install Non Exhaustive Public Types in Claude Code?

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

How do I install Non Exhaustive Public Types in Codex?

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

Can I use Non Exhaustive Public Types 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 non-exhaustive-public-types -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/non-exhaustive-public-types, .gemini/skills/non-exhaustive-public-types, .github/skills/non-exhaustive-public-types and .opencode/skills/non-exhaustive-public-types in your project.

What does Non Exhaustive Public Types need to run?

SKILL.md names no scripts, command-line tools or credentials: Non Exhaustive Public Types is instructions for the agent only.

Does Non Exhaustive Public Types 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 Non Exhaustive Public Types 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 Non Exhaustive Public Types use?

Non Exhaustive Public Types 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 Non Exhaustive Public Types use?

About 545 tokens (SKILL.md is roughly 2.2k 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 Non Exhaustive Public Types?

Skills that share tags, products or a category with Non Exhaustive Public Types: 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 Non Exhaustive Public Types?

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.