Agent skill

Masm Constants

Enforce constant definition and organization conventions for Miden Assembly (.masm) files.

MITAuto-check passedDevelopment

Install Masm Constants

skills CLI

$ npx skills add 0xMiden/protocol --skill masm-constants -a claude-code

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

GitHub CLI

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

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 masm-constants -a codex

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

GitHub CLI

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

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

GitHub CLI

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

--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 masm-constants -a gemini-cli

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

GitHub CLI

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

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 masm-constants -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/masm-constants .github/skills/masm-constants && 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 "masm-constants" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/masm-constants into .github/skills/masm-constants/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "masm-constants", 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 masm-constants -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 masm-constants --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/masm-constants .opencode/skills/masm-constants && 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 "masm-constants" agent skill from https://github.com/0xMiden/protocol/tree/next/.claude/skills/masm-constants into .opencode/skills/masm-constants/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "masm-constants", 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: masm-constants
GitHub stars: 133
Token cost: ~977 tokens
SKILL.md length: 269 words
Files: 1
Skills in repo: 35
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Enforce constant definition and organization conventions for Miden Assembly (.masm) files.

Creating .masm files that define
SKILL.md covers Placement, Organization, Naming and Formatting, plus 2 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Masm Constants is an agent skill from 0xMiden/protocol. Enforce constant definition and organization conventions for Miden Assembly (.masm) files. Use when editing, reviewing, or creating .masm files that define or use constants.

Its SKILL.md is about 980 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

Creating .masm files that define

Example prompts

“/masm-constants”

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).
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 Constants loads about 977 tokens when it runs. Until then it costs about 47 tokens; SKILL.md has 269 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~47
When it runs · the whole SKILL.md, loaded when a task matches: ~977

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). 269 words, ~977 tokens.

Download SKILL.mdSave it as .claude/skills/masm-constants/SKILL.md (or your agent's skills folder).

name: masm-constants
description: Enforce constant definition and organization conventions for Miden Assembly (.masm) files. Use when editing, reviewing, or creating .masm files that define or use constants.

MASM Constant Conventions

Placement

Constants must be defined at the top of the file, before any procedure definitions, but after imports or type aliases.

Organization

Constants Section (first)

Group non-error constants by topic. Use blank lines between sections. Common topics:

Slot names – use word("path::to::slot") for slot identifiers
Memory pointer offsets – offsets into memory regions
Magic numbers / values – domain-specific literals
Event identifiers – for emit / trace

Order sections by dependency or by usage frequency. Put the most widely used first.

Errors Section (after constants)

Errors (panic/assert error codes, e.g. ERR_*) go in a dedicated "errors" section, placed after the constants section. Define them with string values describing the error.

Naming

Memory Pointers

Memory pointer constants describe offsets into memory regions that are shared or global (e.g. layout of a memory region, input/output structure offsets). They are not scoped to a single procedure and do not use the procedure prefix.

masm

# Good: descriptive, shared usage
const ASSET_OFF = 0
const AMOUNT_OFF = 1
const NOTE_DATA_LEN = 16

# Or grouped by memory region if applicable
const INPUT_PTR_OFF = 0
const INPUT_LEN_OFF = 1

Memory Locals Offsets

Memory locals offsets are procedure-scoped: they describe offsets within a procedure's local memory. They must be prefixed with the procedure name they belong to:

masm

# Good: procedure-prefixed
const validate_note_NOTE_IDX_LOC = 0
const validate_note_ASSET_LOC = 1
const process_input_INPUT_PTR_OFF = 0

# Bad: generic, ambiguous
const NOTE_IDX_LOC = 0
const ASSET_LOC = 1
const INPUT_PTR_OFF = 0

This keeps offsets scoped and avoids collisions when multiple procedures use local memory.

Formatting

Put spaces around the equals sign.

Errors – string value describing the error:

masm

const ERR_BRIDGE_NOT_MAINNET = "bridge not mainnet"
const ERR_UNAUTHORIZED = "unauthorized"

Slots – use word() with the slot path:

masm

const BRIDGE_ID_SLOT = word("miden::agglayer::faucet")
const SLOT_ACCOUNT_ID = word("account::id")

Offsets / numeric values – plain numbers:

masm

const validate_note_NOTE_IDX_LOC = 0
const validate_note_ASSET_LOC = 1

Example Layout

masm

# CONSTANTS
# =================================================================================================

# Slots
const BRIDGE_ID_SLOT = word("miden::agglayer::faucet")
const SLOT_ACCOUNT_ID = word("account::id")

# Memory pointers
const ASSET_OFF = 0
const AMOUNT_OFF = 1

# validate_note locals
const validate_note_NOTE_IDX_LOC = 0
const validate_note_ASSET_LOC = 1

# process_input locals
const process_input_INPUT_PTR_OFF = 0
const process_input_LEN_OFF = 1

# ERRORS
# =================================================================================================

const ERR_BRIDGE_NOT_MAINNET = "bridge not mainnet"
const ERR_UNAUTHORIZED = "unauthorized"
const ERR_NOTE_NOT_FOUND = "note not found"

# PUBLIC INTERFACE
# =================================================================================================

pub proc validate_note
    ...
end

Validation Checklist

Errors in dedicated section, placed after constants
All constants defined at top of file
Non-error constants grouped by topic with blank lines between sections
Memory pointers (shared/global) use descriptive names without procedure prefix
Memory locals offsets prefixed with procedure name
Spaces around = in all constant definitions
Section comments used to label topic groups

Files

Just SKILL.md in .claude/skills/masm-constants of 0xMiden/protocol.

Open the folder on GitHubat commit 62b59ec

Compare with similar skills

Masm Constants 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 Constants compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Masm Constants this skill0xMiden/protocol	133	—	~977	Automated safety check: Pass	MIT	yesterday
Vercel Composition Patternssupabase/supabase	111k	58 repos	~726	Automated safety check: Pass	MIT	today
Finishing a Development Branchobra/superpowers	297k	5 repos	~1.9k	Automated safety check: Pass	MIT	today
Typescript Advanced Typesrolling-scopes/rsschool-app	10k	25 repos	~4.2k	Automated safety check: Pass	MPL-2.0	6 days ago
PR Babysitteropeninterpreter/openinterpreter	69k	3 repos	~4.2k	Automated safety check: Pass	Apache-2.0	3 days ago
Code Review ChecklistshareAI-lab/learn-claude-code	78k	4 repos	~1.1k	Automated safety check: Pass	MIT	12 days ago

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Conversion Method Naming
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Questions about Masm Constants

What does Masm Constants do?

Enforce constant definition and organization conventions for Miden Assembly (.masm) files. Masm Constants is an agent skill from 0xMiden/protocol.masm) files.

When should I use Masm Constants?

Masm Constants fits situations like: creating .masm files that define.

How do I install Masm Constants in Claude Code?

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

How do I install Masm Constants in Codex?

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

Can I use Masm Constants 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-constants -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-constants, .gemini/skills/masm-constants, .github/skills/masm-constants and .opencode/skills/masm-constants in your project.

What does Masm Constants need to run?

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

Does Masm Constants 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 Constants 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 Constants use?

Masm Constants 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 Constants use?

About 977 tokens (SKILL.md is roughly 3.9k 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 Constants?

Skills that share tags, products or a category with Masm Constants: 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 Masm Constants?

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.

Install Masm Constants

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

MASM Constant Conventions

Placement

Organization

Constants Section (first)

Errors Section (after constants)

Naming

Memory Pointers

Memory Locals Offsets

Formatting

Example Layout

Validation Checklist

Files

Compare with similar skills

Similar skills

More from 0xMiden/protocol

Related

Questions about Masm Constants