Agent skill

Defi Amm Security

Security checklist for Solidity AMM contracts, liquidity pools, and swap flows.

MITAuto-check passedBusiness, Finance & HR

Install Defi Amm Security

skills CLI

$ npx skills add affaan-m/ECC --skill defi-amm-security -a claude-code

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

GitHub CLI

$ gh skill install affaan-m/ECC defi-amm-security --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/skills/defi-amm-security .claude/skills/defi-amm-security && 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 "defi-amm-security" agent skill from https://github.com/affaan-m/ECC/tree/main/skills/defi-amm-security into .claude/skills/defi-amm-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "defi-amm-security", 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/skills/defi-amm-security

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 defi-amm-security -a codex

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

GitHub CLI

$ gh skill install affaan-m/ECC defi-amm-security --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/skills/defi-amm-security .agents/skills/defi-amm-security && 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 "defi-amm-security" agent skill from https://github.com/affaan-m/ECC/tree/main/skills/defi-amm-security into .agents/skills/defi-amm-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "defi-amm-security", 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 defi-amm-security -a cursor

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

GitHub CLI

$ gh skill install affaan-m/ECC defi-amm-security --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/skills/defi-amm-security .cursor/skills/defi-amm-security && 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 "defi-amm-security" agent skill from https://github.com/affaan-m/ECC/tree/main/skills/defi-amm-security into .cursor/skills/defi-amm-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "defi-amm-security", 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 skills/defi-amm-security

--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 defi-amm-security -a gemini-cli

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

GitHub CLI

$ gh skill install affaan-m/ECC defi-amm-security --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/skills/defi-amm-security .gemini/skills/defi-amm-security && 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 "defi-amm-security" agent skill from https://github.com/affaan-m/ECC/tree/main/skills/defi-amm-security into .gemini/skills/defi-amm-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "defi-amm-security", 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 defi-amm-security

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 defi-amm-security -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/skills/defi-amm-security .github/skills/defi-amm-security && 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 "defi-amm-security" agent skill from https://github.com/affaan-m/ECC/tree/main/skills/defi-amm-security into .github/skills/defi-amm-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "defi-amm-security", 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 defi-amm-security -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 defi-amm-security --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/skills/defi-amm-security .opencode/skills/defi-amm-security && 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 "defi-amm-security" agent skill from https://github.com/affaan-m/ECC/tree/main/skills/defi-amm-security into .opencode/skills/defi-amm-security/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "defi-amm-security", 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: defi-amm-security
GitHub stars: 277k
Used in: 1 other repo
Token cost: ~1.3k tokens
SKILL.md length: 336 words
Files: 1
Skills in repo: 683
Repo updated: Oct 11, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Security checklist for Solidity AMM contracts, liquidity pools, and swap flows.

Writing Solidity AMM
SKILL.md covers When to Use, How It Works, Execution Safety and Examples, plus 2 more sections
Calls pip
Tasks that involve Crypto and DeFi analysis

What it does

Defi Amm Security is an agent skill from affaan-m/ECC. Security checklist for Solidity AMM contracts, liquidity pools, and swap flows. Covers reentrancy, CEI ordering, donation or inflation attacks, oracle manipulation, slippage, admin controls, and integer math. Use when auditing or writing Solidity AMM, liquidity pool, or swap code.

Its SKILL.md is about 1.3k 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 Business, Finance & HR, covering Crypto and DeFi analysis, Smart contracts and Smart contract auditing. It works with Solidity. 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

Writing Solidity AMM
Tasks that involve Crypto and DeFi analysis
Tasks that involve Smart contracts

Example prompts

“/defi-amm-security”

Requirements

Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit 2d515e4. 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
Shell commands in SKILL.md call:
- pip
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use pip, which can reach the network depending on how they are called.
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

Defi Amm Security loads about 1.3k tokens when it runs. Until then it costs about 75 tokens; SKILL.md has 336 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~75
When it runs · the whole SKILL.md, loaded when a task matches: ~1.3k

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 2d515e4, republished under its MIT licence (© affaan-m). 336 words, ~1,348 tokens.

Download SKILL.mdSave it as .claude/skills/defi-amm-security/SKILL.md (or your agent's skills folder).

name: defi-amm-security
description: Security checklist for Solidity AMM contracts, liquidity pools, and swap flows. Covers reentrancy, CEI ordering, donation or inflation attacks, oracle manipulation, slippage, admin controls, and integer math. Use when auditing or writing Solidity AMM, liquidity pool, or swap code.
metadata.version: 1.0.0
metadata.origin: ECC direct-port adaptation

DeFi AMM Security

Critical vulnerability patterns and hardened implementations for Solidity AMM contracts, LP vaults, and swap functions.

When to Use

Writing or auditing a Solidity AMM or liquidity-pool contract
Implementing swap, deposit, withdraw, mint, or burn flows that hold token balances
Reviewing any contract that uses token.balanceOf(address(this)) in share or reserve math
Adding fee setters, pausers, oracle updates, or other admin functions to a DeFi protocol

How It Works

Use this as a checklist-plus-pattern library. Review every user entrypoint against the categories below and prefer the hardened examples over hand-rolled variants.

Execution Safety

The shell commands in this skill are local audit examples. Run them only in a trusted checkout or disposable sandbox, and do not splice untrusted contract names, paths, RPC URLs, private keys, or user-supplied flags into shell commands. Ask before installing tools or running long fuzzing/static-analysis jobs that may consume significant local or paid resources.

Never include secrets, private keys, seed phrases, API tokens, or mainnet signing credentials in command examples, logs, or reports.

Examples

Reentrancy: enforce CEI order

Vulnerable:

solidity

function withdraw(uint256 amount) external {
    require(balances[msg.sender] >= amount);
    token.transfer(msg.sender, amount);
    balances[msg.sender] -= amount;
}

Safe:

solidity

import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

using SafeERC20 for IERC20;

function withdraw(uint256 amount) external nonReentrant {
    require(balances[msg.sender] >= amount, "Insufficient");
    balances[msg.sender] -= amount;
    token.safeTransfer(msg.sender, amount);
}

Do not write your own guard when a hardened library exists.

Donation or inflation attacks

Using token.balanceOf(address(this)) directly for share math lets attackers manipulate the denominator by sending tokens to the contract outside the intended path.

solidity

// Vulnerable
function deposit(uint256 assets) external returns (uint256 shares) {
    shares = (assets * totalShares) / token.balanceOf(address(this));
}

solidity

// Safe
uint256 private _totalAssets;

function deposit(uint256 assets) external nonReentrant returns (uint256 shares) {
    uint256 balBefore = token.balanceOf(address(this));
    token.safeTransferFrom(msg.sender, address(this), assets);
    uint256 received = token.balanceOf(address(this)) - balBefore;

    shares = totalShares == 0 ? received : (received * totalShares) / _totalAssets;
    _totalAssets += received;
    totalShares += shares;
}

Track internal accounting and measure actual tokens received.

Oracle manipulation

Spot prices are flash-loan manipulable. Prefer TWAP.

solidity

uint32[] memory secondsAgos = new uint32[](2);
secondsAgos[0] = 1800;
secondsAgos[1] = 0;
(int56[] memory tickCumulatives,) = IUniswapV3Pool(pool).observe(secondsAgos);
int24 twapTick = int24(
    (tickCumulatives[1] - tickCumulatives[0]) / int56(uint56(30 minutes))
);
uint160 sqrtPriceX96 = TickMath.getSqrtRatioAtTick(twapTick);

Slippage protection

Every swap path needs caller-provided slippage and a deadline.

solidity

function swap(
    uint256 amountIn,
    uint256 amountOutMin,
    uint256 deadline
) external returns (uint256 amountOut) {
    require(block.timestamp <= deadline, "Expired");
    amountOut = _calculateOut(amountIn);
    require(amountOut >= amountOutMin, "Slippage exceeded");
    _executeSwap(amountIn, amountOut);
}

Safe reserve math

solidity

import {FullMath} from "@uniswap/v3-core/contracts/libraries/FullMath.sol";

uint256 result = FullMath.mulDiv(a, b, c);

For large reserve math, avoid naive a * b / c when overflow risk exists.

Admin controls

solidity

import {Ownable2Step} from "@openzeppelin/contracts/access/Ownable2Step.sol";

contract MyAMM is Ownable2Step {
    function setFee(uint256 fee) external onlyOwner { ... }
    function pause() external onlyOwner { ... }
}

Prefer explicit acceptance for ownership transfer and gate every privileged path.

Security Checklist

Reentrancy-exposed entrypoints use nonReentrant
CEI ordering is respected
Share math does not depend on raw balanceOf(address(this))
ERC-20 transfers use SafeERC20
Deposits measure actual tokens received
Oracle reads use TWAP or another manipulation-resistant source
Swaps require amountOutMin and deadline
Overflow-sensitive reserve math uses safe primitives like mulDiv
Admin functions are access-controlled
Emergency pause exists and is tested
Static analysis and fuzzing are run before production

Audit Tools

bash

pip install slither-analyzer
slither . --exclude-dependencies

echidna-test . --contract YourAMM --config echidna.yaml

forge test --fuzz-runs 10000

Files

Just SKILL.md in skills/defi-amm-security of affaan-m/ECC.

Open the folder on GitHubat commit 2d515e4

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in affaan-m/ECC, which our catalogue first saw on October 7, 2026.

templetongroup/radiantskills/defi-amm-security

Compare with similar skills

Defi Amm Security 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.

Defi Amm Security compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Defi Amm Security this skillaffaan-m/ECC	277k	1 repos	~1.3k	Automated safety check: Pass	MIT	today
Solidity AuditorGabson0x/bountyforge	442	—	~3.7k	Automated safety check: Pass	None	24 days ago
Solidity Auditorpashov/skills	1.2k	—	~9.9k	Automated safety check: Pass	MIT	6 days ago
Solidity Vulnerability Scanneralt-research2/SolidityGuard	104	—	~1.6k	Automated safety check: Notes	Custom licence	4 mo ago
Behavioral State Analysisquillai-network/quillshield_skills	130	—	~1.4k	Automated safety check: Pass	MIT	6 mo ago
Oracle Flashloan Analysisquillai-network/quillshield_skills	130	—	~2.8k	Automated safety check: Pass	MIT	6 mo ago

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Questions about Defi Amm Security

What does Defi Amm Security do?

Security checklist for Solidity AMM contracts, liquidity pools, and swap flows. Defi Amm Security is an agent skill from affaan-m/ECC. Security checklist for Solidity AMM contracts, liquidity pools, and swap flows.

When should I use Defi Amm Security?

Defi Amm Security fits situations like: writing Solidity AMM; tasks that involve Crypto and DeFi analysis; tasks that involve Smart contracts.

How do I install Defi Amm Security in Claude Code?

Run `npx skills add affaan-m/ECC --skill defi-amm-security -a claude-code`. Or copy the skill folder (skills/defi-amm-security in affaan-m/ECC) into .claude/skills/defi-amm-security in your project. Claude Code loads it when a task matches its description.

How do I install Defi Amm Security in Codex?

Run `npx skills add affaan-m/ECC --skill defi-amm-security -a codex`. Or copy the skill folder (skills/defi-amm-security in affaan-m/ECC) into .agents/skills/defi-amm-security in your project. Codex loads it when a task matches its description.

Can I use Defi Amm Security 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 defi-amm-security -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/defi-amm-security, .gemini/skills/defi-amm-security, .github/skills/defi-amm-security and .opencode/skills/defi-amm-security in your project.

What does Defi Amm Security need to run?

Going by SKILL.md and its folder, Defi Amm Security needs the command-line tools its instructions call (pip). Our summary lists: Python 3.

Does Defi Amm Security access the network?

SKILL.md contains no URLs. Its commands use pip, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Defi Amm Security 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 Defi Amm Security use?

Defi Amm Security 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 Defi Amm Security use?

About 1.3k tokens (SKILL.md is roughly 5.4k 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 Defi Amm Security?

Skills that share tags, products or a category with Defi Amm Security: Solidity Auditor (Gabson0x/bountyforge, 442 stars), Solidity Auditor (pashov/skills, 1.2k stars), Solidity Vulnerability Scanner (alt-research2/SolidityGuard, 104 stars) and Behavioral State Analysis (quillai-network/quillshield_skills, 130 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Defi Amm Security?

affaan-m (a GitHub user) maintains it in affaan-m/ECC, which has 276,673 GitHub stars. The repository holds 683 skills in this directory. The repository was last updated on October 11, 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 Defi Amm Security

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

DeFi AMM Security

When to Use

How It Works

Execution Safety

Examples

Reentrancy: enforce CEI order

Donation or inflation attacks

Oracle manipulation

Slippage protection

Safe reserve math

Admin controls

Security Checklist

Audit Tools

Files

Used in 1 other repository

Compare with similar skills

Similar skills

More from affaan-m/ECC

Related

Questions about Defi Amm Security