math_precision

Guide to Precision Loss, Division before Multiplication, and Rounding

IndexedMIT★ 12

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Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.

npx agentmarket install skill/itsdarktoday-math-precision

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About

Guide to Precision Loss, Division before Multiplication, and Rounding

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Permissions

What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.

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codeload.github.com · found in install command

Files it touches

~/.claude/skills/math-precision

What's inside

Skill name: math_precision
Description: Guide to Precision Loss, Division before Multiplication, and Rounding
License: MIT
Instructions: 21 lines in SKILL.md · view on GitHub

Agent Skills spec issues

name: only lowercase letters, digits and single hyphens allowed

Files (1)

SKILL.md

SKILL.md (first lines)

# Math Precision, Rounding & Arithmetic Security

### 1. Division Before Multiplication
- **Anti-Pattern**:
  ```solidity
  uint256 reward = userBalance / totalBalance * rewardPool; // userBalance / totalBalance truncates to 0!
  ```
- **Remediation**:
  ```solidity
  uint256 reward = (userBalance * rewardPool) / totalBalance;
  ```

### 2. Decimal Mismatch & Precision Loss
- Scaling between 6-decimal tokens (USDC, USDT), 8-decimal tokens (WBTC), and 18-decimal tokens (DAI, ETH).
- Always scale up to 18 decimals before division, and scale down only at the final settlement step.

### 3. Unchecked Arithmetic Hazards
- In Solidity 0.8+, `unchecked { ... }` bypasses compiler overflow/underflow checks.
- Audit every `unchecked` block for possible underflow in balance subtractions or counter loops.

From itsdarktoday/auditcode, MIT.

Signals

Stars: 12
Forks: 6
Open issues: 0
Last commit (this folder): Aug 27, 2026 (2 months ago)
Last release: Sep 15, 2026 (1 month ago)

From GitHub (fetched Oct 24, 2026).

Details

License: MIT
Repository: github.com/itsdarktoday/auditcode
First seen: Oct 24, 2026
Last checked: Oct 24, 2026
Source: GitHub github-graphql

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Cite this page

math_precision skill. Agent Mart. https://agentmart.dev/skills/itsdarktoday-math-precision (last updated 2026-10-24)