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Agent skill

Masm Rust Constant Parity

by 0xMiden in 0xMiden/protocol

A skill your agent uses when changing a numeric or string constant in Rust or MASM that has a counterpart on the other side — keep the two definitions from drifting apart.

MITAuto-check passedDevelopment

Install Masm Rust Constant Parity

skills CLI
$ npx skills add 0xMiden/protocol --skill masm-rust-constant-parity -a claude-code

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

GitHub CLI
$ gh skill install 0xMiden/protocol masm-rust-constant-parity --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/masm-rust-constant-parity .claude/skills/masm-rust-constant-parity && 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
masm-rust-constant-parity
GitHub stars
133
Token cost
~563 tokens
SKILL.md length
212 words
Files
1
Skills in repo
35
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when changing a numeric or string constant in Rust or MASM that has a counterpart on the other side — keep the two definitions from drifting apart.

  • Changing a numeric
  • SKILL.md covers Rule, Why and Examples
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • String constant in Rust

What it does

Masm Rust Constant Parity is an agent skill from 0xMiden/protocol. Use when changing a numeric or string constant in Rust or MASM that has a counterpart on the other side — keep the two definitions from drifting apart.

Its SKILL.md is about 560 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

  • Changing a numeric
  • String constant in Rust
  • MASM that has a counterpart on the other side — keep the two definitions from drifting apart

Example prompts

  • “/masm-rust-constant-parity”

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 masm and 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

Masm Rust Constant Parity loads about 563 tokens when it runs. Until then it costs about 44 tokens; SKILL.md has 212 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~44
When it runs · the whole SKILL.md, loaded when a task matches
~563

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). 212 words, ~563 tokens.

Download SKILL.mdSave it as .claude/skills/masm-rust-constant-parity/SKILL.md (or your agent's skills folder).
name
masm-rust-constant-parity
description
Use when changing a numeric or string constant in Rust or MASM that has a counterpart on the other side — keep the two definitions from drifting apart.

Keep Rust and MASM Constants Aligned

Rule

Constants that exist on both the MASM and the Rust side must not drift. Prefer a single source of truth: define the constant in MASM and generate the Rust counterpart from it, rather than hand-maintaining the same literal in two places.

This repo already does that in crates/miden-protocol/build.rs: it scans the MASM sources for const ERR_... = "..." and const X = event("...") definitions and emits Rust files (tx_kernel_errors.rs, protocol_errors.rs, transaction_events.rs) that are pulled in with include!(concat!(env!("OUT_DIR"), ...)) (see src/errors/mod.rs and src/transaction/kernel/tx_event_id.rs). A new error or event constant added in MASM gets its Rust binding automatically.

For constants not covered by codegen (memory offsets, capacity limits, field widths still duplicated in src/constants.rs / memory.rs), update both sides in the same PR — and prefer extending the generation over adding another hand-copied literal.

Why

The kernel reads memory at offsets the Rust host wrote. If one side changes ACCOUNT_HEADER_LEN and the other doesn't, every transaction misreads its state, and the bug stays invisible until a value happens to straddle the changed offset. Generating one side from the other removes the chance to forget.

Examples

Source of truth in MASM:

masm
const ERR_PROLOGUE_NEW_ACCOUNT_VAULT_MUST_BE_EMPTY="new account must have an empty vault"

Generated into OUT_DIR by build.rs and included via include!(concat!(env!("OUT_DIR"), "/tx_kernel_errors.rs")):

rust
pub const ERR_PROLOGUE_NEW_ACCOUNT_VAULT_MUST_BE_EMPTY: MasmError =
    MasmError::from_static_str("new account must have an empty vault");

For a constant that is still hand-duplicated, change both in the same PR:

rust
// crates/miden-protocol/src/constants.rs
pub const MAX_INPUT_NOTES_PER_TX: usize = 1024;
masm
# crates/miden-protocol/asm/.../constants.masm — must equal the Rust constant
pub const MAX_INPUT_NOTES_PER_TX = 1024

© 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/masm-rust-constant-parity of 0xMiden/protocol.

Open the folder on GitHubat commit 62b59ec

Compare with similar skills

Masm Rust Constant Parity 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.

Masm Rust Constant Parity compared with similar skills
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Rust Best Practicesfarm-fe/farm5.6k3 repos~1.1kAutomated safety check: PassMIT
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 Masm Rust Constant Parity

What does Masm Rust Constant Parity do?

A skill your agent uses when changing a numeric or string constant in Rust or MASM that has a counterpart on the other side — keep the two definitions from drifting apart. Masm Rust Constant Parity is an agent skill from 0xMiden/protocol. Use when changing a numeric or string constant in Rust or MASM that has a counterpart on the other side — keep the two definitions from drifting apart.

When should I use Masm Rust Constant Parity?

Masm Rust Constant Parity fits situations like: changing a numeric; string constant in Rust; MASM that has a counterpart on the other side — keep the two definitions from drifting apart.

How do I install Masm Rust Constant Parity in Claude Code?

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

How do I install Masm Rust Constant Parity in Codex?

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

Can I use Masm Rust Constant Parity 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 masm-rust-constant-parity -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/masm-rust-constant-parity, .gemini/skills/masm-rust-constant-parity, .github/skills/masm-rust-constant-parity and .opencode/skills/masm-rust-constant-parity in your project.

What does Masm Rust Constant Parity need to run?

SKILL.md names no scripts, command-line tools or credentials: Masm Rust Constant Parity is instructions for the agent only.

Does Masm Rust Constant Parity 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 Masm Rust Constant Parity 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 Masm Rust Constant Parity use?

Masm Rust Constant Parity 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 Masm Rust Constant Parity use?

About 563 tokens (SKILL.md is roughly 2.3k 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 Masm Rust Constant Parity?

Skills that share tags, products or a category with Masm Rust Constant Parity: Migrate Core Code to Submodules (tinyhumansai/openhuman, 42k stars), OpenLogi macOS Permissions Triage (AprilNEA/OpenLogi, 23k stars), Rust Best Practices (farm-fe/farm, 5.6k 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 Masm Rust Constant Parity?

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.