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Agent skill

Checked Arithmetic

by 0xMiden in 0xMiden/protocol

A skill your agent uses when writing Rust arithmetic on amounts or other quantities derived from external/user input — guard against silent overflow.

MITAuto-check passedDevelopment

Install Checked Arithmetic

skills CLI
$ npx skills add 0xMiden/protocol --skill checked-arithmetic -a claude-code

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

GitHub CLI
$ gh skill install 0xMiden/protocol checked-arithmetic --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/checked-arithmetic .claude/skills/checked-arithmetic && 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
checked-arithmetic
GitHub stars
133
Token cost
~342 tokens
SKILL.md length
121 words
Files
1
Skills in repo
34
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when writing Rust arithmetic on amounts or other quantities derived from external/user input — guard against silent overflow.

  • Writing Rust arithmetic on amounts
  • SKILL.md covers Rule, Why and Examples
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Other quantities derived from external/user input — guard against silent overflow

What it does

Checked Arithmetic is an agent skill from 0xMiden/protocol. Use when writing Rust arithmetic on amounts or other quantities derived from external/user input — guard against silent overflow.

Its SKILL.md is about 340 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. It works with Rust. The repository describes itself as: Core components of the Miden protocol. The licence is MIT.

When your agent uses it

  • Writing Rust arithmetic on amounts
  • Other quantities derived from external/user input — guard against silent overflow

Example prompts

  • “/checked-arithmetic”

What it can do on your machine

Read from SKILL.md and the folder at commit 3a8215e. 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

Checked Arithmetic loads about 342 tokens when it runs. Until then it costs about 37 tokens; SKILL.md has 121 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~37
When it runs · the whole SKILL.md, loaded when a task matches
~342

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 3a8215e, republished under its MIT licence (© 0xMiden). 121 words, ~342 tokens.

Download SKILL.mdSave it as .claude/skills/checked-arithmetic/SKILL.md (or your agent's skills folder).
name
checked-arithmetic
description
Use when writing Rust arithmetic on amounts or other quantities derived from external/user input — guard against silent overflow.

Checked Arithmetic on User-Supplied Values

Rule

Any arithmetic where one or more operands originates from external input (transaction body, advice provider, user RPC, deserialized payload) must use checked or overflowing arithmetic and surface the overflow:

  • Prefer checked_add / checked_sub / checked_mul and return an error on None.
  • Use overflowing_add / widening_mul when you need the wrapping value and the overflow flag; then assert!(!overflow) (or branch) before using the result.
  • Do not use the default +, -, * operators on untrusted values in release builds — debug-only overflow checks are not enough.

Why

The default +, -, * operators wrap silently in release builds, so an overflow on a balance or amount yields a wrong value with no error. Checked and overflowing operations surface the overflow so it can be rejected.

Examples

rust
// Good: checked
let total = balance.checked_add(amount).ok_or(Error::Overflow)?;

// Good: overflowing with explicit flag check
let (product, overflow) = a.widening_mul(b);
if overflow { return Err(Error::Overflow); }

// Bad: wraps on overflow in release
let total = balance + amount;

© 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/checked-arithmetic of 0xMiden/protocol.

Open the folder on GitHubat commit 3a8215e

Compare with similar skills

Checked Arithmetic 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.

Checked Arithmetic compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Checked Arithmetic this skill0xMiden/protocol133—~342Automated safety check: PassMIT
Migrate Core Code to Submodulestinyhumansai/openhuman41k—~2.6kAutomated safety check: PassGPL-3.0
Rust Best Practicesfarm-fe/farm5.6k3 repos~1.1kAutomated safety check: PassMIT
OpenLogi macOS Permissions TriageAprilNEA/OpenLogi23k—~2.5kAutomated safety check: NotesApache-2.0
RTK Rust Design Patternsrtk-ai/rtk83k—~1.9kAutomated safety check: PassApache-2.0
Release Skillsnexmoe/eve4213 repos~3.3kAutomated safety check: PassNone

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Works with

Categories

Questions about Checked Arithmetic

What does Checked Arithmetic do?

A skill your agent uses when writing Rust arithmetic on amounts or other quantities derived from external/user input — guard against silent overflow. Checked Arithmetic is an agent skill from 0xMiden/protocol. Use when writing Rust arithmetic on amounts or other quantities derived from external/user input — guard against silent overflow.

When should I use Checked Arithmetic?

Checked Arithmetic fits situations like: writing Rust arithmetic on amounts; other quantities derived from external/user input — guard against silent overflow.

How do I install Checked Arithmetic in Claude Code?

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

How do I install Checked Arithmetic in Codex?

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

Can I use Checked Arithmetic 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 checked-arithmetic -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/checked-arithmetic, .gemini/skills/checked-arithmetic, .github/skills/checked-arithmetic and .opencode/skills/checked-arithmetic in your project.

What does Checked Arithmetic need to run?

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

Does Checked Arithmetic 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 Checked Arithmetic 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 Checked Arithmetic use?

Checked Arithmetic 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 Checked Arithmetic use?

About 342 tokens (SKILL.md is roughly 1.4k 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 Checked Arithmetic?

Skills that share tags, products or a category with Checked Arithmetic: Migrate Core Code to Submodules (tinyhumansai/openhuman, 41k stars), Rust Best Practices (farm-fe/farm, 5.6k stars), OpenLogi macOS Permissions Triage (AprilNEA/OpenLogi, 23k stars) and RTK Rust Design Patterns (rtk-ai/rtk, 83k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Checked Arithmetic?

0xMiden (a GitHub organization) maintains it in 0xMiden/protocol, which has 133 GitHub stars. The repository holds 34 skills in this directory. The repository was last updated on October 6, 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.