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Agent skill

Lowercase Error Messages

by 0xMiden in 0xMiden/protocol

A skill your agent uses when writing or editing a Rust error message, panic/assert string, or MASM ERR constant — follow the Rust convention for error-message casing and punctuation.

MITAuto-check passedDevelopment

Install Lowercase Error Messages

skills CLI
$ npx skills add 0xMiden/protocol --skill lowercase-error-messages -a claude-code

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

GitHub CLI
$ gh skill install 0xMiden/protocol lowercase-error-messages --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/lowercase-error-messages .claude/skills/lowercase-error-messages && 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
lowercase-error-messages
GitHub stars
133
Token cost
~407 tokens
SKILL.md length
102 words
Files
1
Skills in repo
35
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when writing or editing a Rust error message, panic/assert string, or MASM ERR constant — follow the Rust convention for error-message casing and punctuation.

  • Editing a Rust error message
  • SKILL.md covers Rule, Why and Examples
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Panic/assert string

What it does

Lowercase Error Messages is an agent skill from 0xMiden/protocol. Use when writing or editing a Rust error message, panic/assert string, or MASM ERR constant — follow the Rust convention for error-message casing and punctuation.

Its SKILL.md is about 410 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

  • Editing a Rust error message
  • Panic/assert string
  • MASM ERR constant — follow the Rust convention for error-message casing and punctuation

Example prompts

  • “/lowercase-error-messages”

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 and 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

Lowercase Error Messages loads about 407 tokens when it runs. Until then it costs about 48 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
~48
When it runs · the whole SKILL.md, loaded when a task matches
~407

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, ~407 tokens.

Download SKILL.mdSave it as .claude/skills/lowercase-error-messages/SKILL.md (or your agent's skills folder).
name
lowercase-error-messages
description
Use when writing or editing a Rust error message, panic/assert string, or MASM `ERR_*` constant — follow the Rust convention for error-message casing and punctuation.

Lowercase Error Messages, No Trailing Punctuation

Rule

Error messages (in Error enum #[error("...")] attributes, panic!, assert! messages, MASM ERR_* constant strings) follow Rust's convention:

  • Start with a lowercase letter (unless beginning with a proper noun or acronym).
  • No trailing period, exclamation, or other punctuation.
  • Imperative or descriptive, not "ERROR: ..." or "Failed to ...".

Examples of correct shape: "invalid account id length", "note not found", "failed to deserialize storage".

Why

Error messages get composed into chains and contexts, where a capital letter or trailing period mid-chain makes them read like disconnected sentences. Lowercase-with-no-punctuation is the convention std, thiserror, and most crates already follow.

Examples

rust
// Good
#[derive(Debug, thiserror::Error)]
pub enum AccountError {
    #[error("invalid account id length, expected {expected} bytes, got {got}")]
    InvalidLength { expected: usize, got: usize },
    #[error("account not found")]
    NotFound,
}

// Bad
#[derive(Debug, thiserror::Error)]
pub enum AccountError {
    #[error("Invalid account id length: expected {expected} bytes, got {got}.")]
    InvalidLength { ... },
    #[error("Account not found!")]
    NotFound,
}
masm
# Good
const ERR_NOTE_NOT_FOUND = "note not found"

# Bad
const ERR_NOTE_NOT_FOUND = "Note not found!"

© 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/lowercase-error-messages of 0xMiden/protocol.

Open the folder on GitHubat commit 5f6a246

Compare with similar skills

Lowercase Error Messages 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.

Lowercase Error Messages compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Lowercase Error Messages this skill0xMiden/protocol133—~407Automated safety check: PassMIT
Migrate Core Code to Submodulestinyhumansai/openhuman42k—~2.6kAutomated safety check: PassGPL-3.0
OpenLogi macOS Permissions TriageAprilNEA/OpenLogi23k—~2.5kAutomated safety check: NotesApache-2.0
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 Lowercase Error Messages

What does Lowercase Error Messages do?

A skill your agent uses when writing or editing a Rust error message, panic/assert string, or MASM ERR constant — follow the Rust convention for error-message casing and punctuation. Lowercase Error Messages is an agent skill from 0xMiden/protocol. Use when writing or editing a Rust error message, panic/assert string, or MASM ERR constant — follow the Rust convention for error-message casing and punctuation.

When should I use Lowercase Error Messages?

Lowercase Error Messages fits situations like: editing a Rust error message; panic/assert string; MASM ERR constant — follow the Rust convention for error-message casing and punctuation.

How do I install Lowercase Error Messages in Claude Code?

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

How do I install Lowercase Error Messages in Codex?

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

Can I use Lowercase Error Messages 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 lowercase-error-messages -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/lowercase-error-messages, .gemini/skills/lowercase-error-messages, .github/skills/lowercase-error-messages and .opencode/skills/lowercase-error-messages in your project.

What does Lowercase Error Messages need to run?

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

Does Lowercase Error Messages 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 Lowercase Error Messages 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 Lowercase Error Messages use?

Lowercase Error Messages 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 Lowercase Error Messages use?

About 407 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 Lowercase Error Messages?

Skills that share tags, products or a category with Lowercase Error Messages: 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 Lowercase Error Messages?

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.