Agent skill

Use Bon Builder

A skill your agent uses when introducing a Rust type whose constructor takes more than ~3 optional or named parameters — give it a generated builder instead of hand-written boilerplate.

MITAuto-check passedDevelopment

Install Use Bon Builder

skills CLI

$ npx skills add 0xMiden/protocol --skill use-bon-builder -a claude-code

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

GitHub CLI

$ gh skill install 0xMiden/protocol use-bon-builder --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-bon-builder .claude/skills/use-bon-builder && 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-bon-builder" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-bon-builder into .claude/skills/use-bon-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-bon-builder", 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-bon-builder

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-bon-builder -a codex

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

GitHub CLI

$ gh skill install 0xMiden/protocol use-bon-builder --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-bon-builder .agents/skills/use-bon-builder && 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-bon-builder" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-bon-builder into .agents/skills/use-bon-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-bon-builder", 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-bon-builder -a cursor

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

GitHub CLI

$ gh skill install 0xMiden/protocol use-bon-builder --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-bon-builder .cursor/skills/use-bon-builder && 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-bon-builder" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-bon-builder into .cursor/skills/use-bon-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-bon-builder", 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-bon-builder

--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-bon-builder -a gemini-cli

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

GitHub CLI

$ gh skill install 0xMiden/protocol use-bon-builder --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-bon-builder .gemini/skills/use-bon-builder && 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-bon-builder" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-bon-builder into .gemini/skills/use-bon-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-bon-builder", 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-bon-builder

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-bon-builder -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-bon-builder .github/skills/use-bon-builder && 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-bon-builder" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-bon-builder into .github/skills/use-bon-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-bon-builder", 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-bon-builder -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-bon-builder --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-bon-builder .opencode/skills/use-bon-builder && 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-bon-builder" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/use-bon-builder into .opencode/skills/use-bon-builder/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "use-bon-builder", 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-bon-builder
GitHub stars: 133
Token cost: ~391 tokens
SKILL.md length: 102 words
Files: 1
Skills in repo: 35
Repo updated: Oct 8, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

A skill your agent uses when introducing a Rust type whose constructor takes more than ~3 optional or named parameters — give it a generated builder instead of hand-written boilerplate.

Introducing a Rust type whose constructor takes more than ~3 optional
SKILL.md covers Rule, Why and Examples
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Named parameters — give it a generated builder instead of hand-written boilerplate

What it does

Use Bon Builder is an agent skill from 0xMiden/protocol. Use when introducing a Rust type whose constructor takes more than ~3 optional or named parameters — give it a generated builder instead of hand-written boilerplate.

Its SKILL.md is about 390 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, covering Project scaffolding. It works with Rust. The repository describes itself as: Core components of the Miden protocol. The licence is MIT.

When your agent uses it

Introducing a Rust type whose constructor takes more than ~3 optional
Named parameters — give it a generated builder instead of hand-written boilerplate

Example prompts

“/use-bon-builder”

What it can do on your machine

Read from SKILL.md and the folder at commit 5f6a246. 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 Bon Builder loads about 391 tokens when it runs. Until then it costs about 45 tokens; SKILL.md has 102 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~45
When it runs · the whole SKILL.md, loaded when a task matches: ~391

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 5f6a246, republished under its MIT licence (© 0xMiden). 102 words, ~391 tokens.

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

name: use-bon-builder
description: Use when introducing a Rust type whose constructor takes more than ~3 optional or named parameters — give it a generated builder instead of hand-written boilerplate.

Use `bon` for Builders With Many Optional Fields

Rule

When a type's constructor has many optional or named parameters, derive its builder with #[bon::builder]:

rust

#[bon::builder]
pub fn new(
    required: Foo,
    #[builder(default)] optional: Option<Bar>,
    #[builder(into)] name: String,
) -> Self { ... }

Don't hand-write a separate FooBuilder module just to expose a fluent API. Don't add a constellation of new, new_with_x, new_with_x_and_y constructors.

bon handles compile-time required-field enforcement, optional defaults, and impl Into<T> parameters for free.

Why

Hand-written builders are boilerplate that drifts — add a struct field, forget to set it in the builder, and the bug surfaces later. bon derives the builder from the constructor signature so the two can't diverge, and enforces required fields at compile time.

Examples

rust

// Good
#[bon::builder]
impl Account {
    pub fn new(
        id: AccountId,
        #[builder(default)] storage: AccountStorage,
        #[builder(into)] code: AccountCode,
    ) -> Self { ... }
}

let acc = Account::builder()
    .id(my_id)
    .code(my_code)
    .build();

// Bad: bespoke builder module that drifts
pub struct AccountBuilder { id: Option<AccountId>, storage: Option<AccountStorage>, ... }
impl AccountBuilder { ... 80 lines ... }

Files

Just SKILL.md in .claude/skills/use-bon-builder of 0xMiden/protocol.

Open the folder on GitHubat commit 5f6a246

Compare with similar skills

Use Bon Builder 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 Bon Builder compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Use Bon Builder this skill0xMiden/protocol	133	—	~391	Automated safety check: Pass	MIT	yesterday
Rust Hygiene Audittsz-org/tsz	577	—	~1.5k	Automated safety check: Pass	Apache-2.0	1 mo ago
New CrateDevolutions/IronRDP	3.2k	—	~236	Automated safety check: Pass	Apache-2.0	yesterday
Frb Code Generationfzyzcjy/flutter_rust_bridge	5.4k	—	~1.5k	Automated safety check: Pass	MIT	2 days ago
Jinja Codegenxberg-io/alef	100	—	~735	Automated safety check: Pass	MIT	today
Rocky Codegenrocky-data/rocky	304	—	~1.9k	Automated safety check: Pass	Apache-2.0	yesterday

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All 35 skills in this repo

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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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A skill your agent uses when writing a generic MASM utility that accesses a caller-selected account storage slot — receive the slot as a parameter so the utility is portable across storage layouts.
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Works with

Rust

Questions about Use Bon Builder

What does Use Bon Builder do?

A skill your agent uses when introducing a Rust type whose constructor takes more than ~3 optional or named parameters — give it a generated builder instead of hand-written boilerplate. Use Bon Builder is an agent skill from 0xMiden/protocol. Use when introducing a Rust type whose constructor takes more than ~3 optional or named parameters — give it a generated builder instead of hand-written boilerplate.

When should I use Use Bon Builder?

Use Bon Builder fits situations like: introducing a Rust type whose constructor takes more than ~3 optional; named parameters — give it a generated builder instead of hand-written boilerplate.

How do I install Use Bon Builder in Claude Code?

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

How do I install Use Bon Builder in Codex?

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

Can I use Use Bon Builder 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-bon-builder -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-bon-builder, .gemini/skills/use-bon-builder, .github/skills/use-bon-builder and .opencode/skills/use-bon-builder in your project.

What does Use Bon Builder need to run?

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

Does Use Bon Builder 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 Bon Builder 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 Bon Builder use?

Use Bon Builder 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 Bon Builder use?

About 391 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 Use Bon Builder?

Skills that share tags, products or a category with Use Bon Builder: Rust Hygiene Audit (tsz-org/tsz, 577 stars), New Crate (Devolutions/IronRDP, 3.2k stars), Frb Code Generation (fzyzcjy/flutter_rust_bridge, 5.4k stars) and Jinja Codegen (xberg-io/alef, 100 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Use Bon Builder?

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 8, 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 Bon Builder

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 bon for Builders With Many Optional Fields

Rule

Why

Examples

Files

Compare with similar skills

Similar skills

More from 0xMiden/protocol

Related

Questions about Use Bon Builder

Use `bon` for Builders With Many Optional Fields