Agent skill

Evm Token Decimals

EVMチェーン全体でサイレントな小数点不一致バグを防ぐ。ランタイムでの小数点照会、チェーン対応キャッシング、ブリッジドトークンの精度ドリフト、ボット・ダッシュボード・DeFiツール向けの安全な正規化をカバーします。

Install Evm Token Decimals

skills CLI

$ npx skills add affaan-m/ECC --skill evm-token-decimals -a claude-code

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

GitHub CLI

$ gh skill install affaan-m/ECC evm-token-decimals --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/affaan-m/ECC.git skills-src && mkdir -p .claude/skills && cp -r skills-src/docs/ja-JP/skills/evm-token-decimals .claude/skills/evm-token-decimals && 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 "evm-token-decimals" agent skill from https://github.com/affaan-m/ECC/tree/main/docs/ja-JP/skills/evm-token-decimals into .claude/skills/evm-token-decimals/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "evm-token-decimals", 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/affaan-m/ECC/tree/main/docs/ja-JP/skills/evm-token-decimals

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 affaan-m/ECC --skill evm-token-decimals -a codex

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

GitHub CLI

$ gh skill install affaan-m/ECC evm-token-decimals --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/affaan-m/ECC.git skills-src && mkdir -p .agents/skills && cp -r skills-src/docs/ja-JP/skills/evm-token-decimals .agents/skills/evm-token-decimals && 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 "evm-token-decimals" agent skill from https://github.com/affaan-m/ECC/tree/main/docs/ja-JP/skills/evm-token-decimals into .agents/skills/evm-token-decimals/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "evm-token-decimals", 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 affaan-m/ECC --skill evm-token-decimals -a cursor

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

GitHub CLI

$ gh skill install affaan-m/ECC evm-token-decimals --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/affaan-m/ECC.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/docs/ja-JP/skills/evm-token-decimals .cursor/skills/evm-token-decimals && 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 "evm-token-decimals" agent skill from https://github.com/affaan-m/ECC/tree/main/docs/ja-JP/skills/evm-token-decimals into .cursor/skills/evm-token-decimals/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "evm-token-decimals", 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/affaan-m/ECC.git --path docs/ja-JP/skills/evm-token-decimals

--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 affaan-m/ECC --skill evm-token-decimals -a gemini-cli

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

GitHub CLI

$ gh skill install affaan-m/ECC evm-token-decimals --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/affaan-m/ECC.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/docs/ja-JP/skills/evm-token-decimals .gemini/skills/evm-token-decimals && 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 "evm-token-decimals" agent skill from https://github.com/affaan-m/ECC/tree/main/docs/ja-JP/skills/evm-token-decimals into .gemini/skills/evm-token-decimals/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "evm-token-decimals", 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 affaan-m/ECC evm-token-decimals

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 affaan-m/ECC --skill evm-token-decimals -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/affaan-m/ECC.git skills-src && mkdir -p .github/skills && cp -r skills-src/docs/ja-JP/skills/evm-token-decimals .github/skills/evm-token-decimals && 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 "evm-token-decimals" agent skill from https://github.com/affaan-m/ECC/tree/main/docs/ja-JP/skills/evm-token-decimals into .github/skills/evm-token-decimals/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "evm-token-decimals", 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 affaan-m/ECC --skill evm-token-decimals -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 affaan-m/ECC evm-token-decimals --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/affaan-m/ECC.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/docs/ja-JP/skills/evm-token-decimals .opencode/skills/evm-token-decimals && 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 "evm-token-decimals" agent skill from https://github.com/affaan-m/ECC/tree/main/docs/ja-JP/skills/evm-token-decimals into .opencode/skills/evm-token-decimals/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "evm-token-decimals", 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: evm-token-decimals
GitHub stars: 276k
Token cost: ~814 tokens
SKILL.md length: 26 words
Files: 1
Skills in repo: 683
Repo updated: Oct 10, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Tasks that involve Smart contracts
SKILL.md covers 使用するタイミング, 仕組み, 使用例 and ルール
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Evm Token Decimals is an agent skill from affaan-m/ECC. EVMチェーン全体でサイレントな小数点不一致バグを防ぐ。ランタイムでの小数点照会、チェーン対応キャッシング、ブリッジドトークンの精度ドリフト、ボット・ダッシュボード・DeFiツール向けの安全な正規化をカバーします。

Its SKILL.md is about 810 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 Backend & APIs, covering Smart contracts. The repository describes itself as: The agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond. The licence is MIT.

When your agent uses it

Tasks that involve Smart contracts

Example prompts

“/evm-token-decimals”

Requirements

Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit 4eb71d9. 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 python, solidity, typescript and bash).
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

Evm Token Decimals loads about 814 tokens when it runs. Until then it costs about 32 tokens; SKILL.md has 26 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~32
When it runs · the whole SKILL.md, loaded when a task matches: ~814

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 affaan-m/ECC at commit 4eb71d9, republished under its MIT licence (© affaan-m). 26 words, ~814 tokens.

Download SKILL.mdSave it as .claude/skills/evm-token-decimals/SKILL.md (or your agent's skills folder).

name: evm-token-decimals
description: EVMチェーン全体でサイレントな小数点不一致バグを防ぐ。ランタイムでの小数点照会、チェーン対応キャッシング、ブリッジドトークンの精度ドリフト、ボット・ダッシュボード・DeFiツール向けの安全な正規化をカバーします。
origin: ECC direct-port adaptation
version: 1.0.0

EVMトークン小数点

サイレントな小数点不一致は、エラーを発生させることなく残高やUSD値が桁違いになる最も簡単な方法のひとつです。

使用するタイミング

Python、TypeScript、またはSolidityでERC-20残高を読み取る場合
オンチェーン残高から法定通貨の値を計算する場合
複数のEVMチェーン間でトークン量を比較する場合
ブリッジされた資産を扱う場合
ポートフォリオトラッカー、ボット、またはアグリゲーターを構築する場合

仕組み

ステーブルコインが同じ小数点を使用していると仮定しないでください。ランタイムでdecimals()を照会し、(chain_id, token_address)でキャッシュし、値の計算には小数点安全な数学を使用します。

使用例

ランタイムで小数点を照会する

python

from decimal import Decimal
from web3 import Web3

ERC20_ABI = [
    {"name": "decimals", "type": "function", "inputs": [],
     "outputs": [{"type": "uint8"}], "stateMutability": "view"},
    {"name": "balanceOf", "type": "function",
     "inputs": [{"name": "account", "type": "address"}],
     "outputs": [{"type": "uint256"}], "stateMutability": "view"},
]

def get_token_balance(w3: Web3, token_address: str, wallet: str) -> Decimal:
    contract = w3.eth.contract(
        address=Web3.to_checksum_address(token_address),
        abi=ERC20_ABI,
    )
    decimals = contract.functions.decimals().call()
    raw = contract.functions.balanceOf(Web3.to_checksum_address(wallet)).call()
    return Decimal(raw) / Decimal(10 ** decimals)

シンボルが他の場所で通常6小数点を持つからといって1_000_000をハードコードしないでください。

チェーンとトークンでキャッシュする

python

from functools import lru_cache

@lru_cache(maxsize=512)
def get_decimals(chain_id: int, token_address: str) -> int:
    w3 = get_web3_for_chain(chain_id)
    contract = w3.eth.contract(
        address=Web3.to_checksum_address(token_address),
        abi=ERC20_ABI,
    )
    return contract.functions.decimals().call()

特殊なトークンを防御的に処理する

python

try:
    decimals = contract.functions.decimals().call()
except Exception:
    logging.warning(
        "decimals() reverted on %s (chain %s), defaulting to 18",
        token_address,
        chain_id,
    )
    decimals = 18

フォールバックをログに記録して可視化しておく。古いまたは非標準トークンはまだ存在します。

SolidityでWAD（18小数点）に正規化する

solidity

interface IERC20Metadata {
    function decimals() external view returns (uint8);
}

function normalizeToWad(address token, uint256 amount) internal view returns (uint256) {
    uint8 d = IERC20Metadata(token).decimals();
    if (d == 18) return amount;
    if (d < 18) return amount * 10 ** (18 - d);
    return amount / 10 ** (d - 18);
}

ethersを使ったTypeScript

typescript

import { Contract, formatUnits } from 'ethers';

const ERC20_ABI = [
  'function decimals() view returns (uint8)',
  'function balanceOf(address) view returns (uint256)',
];

async function getBalance(provider: any, tokenAddress: string, wallet: string): Promise<string> {
  const token = new Contract(tokenAddress, ERC20_ABI, provider);
  const [decimals, raw] = await Promise.all([
    token.decimals(),
    token.balanceOf(wallet),
  ]);
  return formatUnits(raw, decimals);
}

クイックなオンチェーン確認

bash

cast call <token_address> "decimals()(uint8)" --rpc-url <rpc>

ルール

常にランタイムでdecimals()を照会する
シンボルではなく、チェーンとトークンアドレスでキャッシュする
floatではなくDecimal、BigInt、または同等の正確な数学を使用する
ブリッジングやラッパーの変更後は小数点を再照会する
比較や価格計算の前に内部会計を一貫して正規化する

Files

Just SKILL.md in docs/ja-JP/skills/evm-token-decimals of affaan-m/ECC.

Open the folder on GitHubat commit 4eb71d9

Compare with similar skills

Evm Token Decimals 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.

Evm Token Decimals compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Evm Token Decimals this skillaffaan-m/ECC	276k	—	~814	Automated safety check: Pass	MIT	yesterday
Verifyalsk1992/CloddsBot	3k	—	~1.2k	Automated safety check: Pass	MIT	8 days ago
Okx Dex MarketLeoYeAI/openclaw-master-skills	2.2k	—	~5.9k	Automated safety check: Notes	MIT	2 mo ago
UrizenBankrBot/skills	1.2k	—	~1.7k	Automated safety check: Pass	None	yesterday
Solana Token Extensionssolanabr/ai-kit	109	—	~3.5k	Automated safety check: Pass	MIT	today
Deposit QrSuperior-Trade/superior-skills	215	—	~1.1k	Automated safety check: Pass	MIT	1 mo ago

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Questions about Evm Token Decimals

What does Evm Token Decimals do?

EVMチェーン全体でサイレントな小数点不一致バグを防ぐ。ランタイムでの小数点照会、チェーン対応キャッシング、ブリッジドトークンの精度ドリフト、ボット・ダッシュボード・DeFiツール向けの安全な正規化をカバーします。. Evm Token Decimals is an agent skill from affaan-m/ECC.

When should I use Evm Token Decimals?

Evm Token Decimals fits situations like: tasks that involve Smart contracts.

How do I install Evm Token Decimals in Claude Code?

Run `npx skills add affaan-m/ECC --skill evm-token-decimals -a claude-code`. Or copy the skill folder (docs/ja-JP/skills/evm-token-decimals in affaan-m/ECC) into .claude/skills/evm-token-decimals in your project. Claude Code loads it when a task matches its description.

How do I install Evm Token Decimals in Codex?

Run `npx skills add affaan-m/ECC --skill evm-token-decimals -a codex`. Or copy the skill folder (docs/ja-JP/skills/evm-token-decimals in affaan-m/ECC) into .agents/skills/evm-token-decimals in your project. Codex loads it when a task matches its description.

Can I use Evm Token Decimals 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 affaan-m/ECC --skill evm-token-decimals -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/evm-token-decimals, .gemini/skills/evm-token-decimals, .github/skills/evm-token-decimals and .opencode/skills/evm-token-decimals in your project.

What does Evm Token Decimals need to run?

SKILL.md names no scripts, command-line tools or credentials: Evm Token Decimals is instructions for the agent only. Our summary lists: Python 3.

Does Evm Token Decimals 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 Evm Token Decimals 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 Evm Token Decimals use?

Evm Token Decimals 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 Evm Token Decimals use?

About 814 tokens (SKILL.md is roughly 3.3k 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 Evm Token Decimals?

Skills that share tags, products or a category with Evm Token Decimals: Verify (alsk1992/CloddsBot, 3k stars), Okx Dex Market (LeoYeAI/openclaw-master-skills, 2.2k stars), Urizen (BankrBot/skills, 1.2k stars) and Solana Token Extensions (solanabr/ai-kit, 109 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Evm Token Decimals?

affaan-m (a GitHub user) maintains it in affaan-m/ECC, which has 276,111 GitHub stars. The repository holds 683 skills in this directory. The repository was last updated on October 10, 2026.

Source: affaan-m/ECC on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Evm Token Decimals

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

EVMトークン小数点

使用するタイミング

仕組み

使用例

ランタイムで小数点を照会する

チェーンとトークンでキャッシュする

特殊なトークンを防御的に処理する

SolidityでWAD（18小数点）に正規化する

ethersを使ったTypeScript

クイックなオンチェーン確認

ルール

Files

Compare with similar skills

Similar skills

More from affaan-m/ECC

Related

Questions about Evm Token Decimals