How do I install the Openzeppelin Contracts skill?

Run npx skillmds@latest add hairyf/openzeppelin-contracts in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Openzeppelin Contracts safe to use?

This skill has not completed SkillMD's automated safety review yet. Capability flags: reads secrets. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Openzeppelin Contracts?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Openzeppelin Contracts free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Openzeppelin Contracts?

hairyf (@hairyf) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Openzeppelin Contracts by hairyf — Agent Skill

Name: Openzeppelin Contracts
Rating: 4.2 (5 reviews)
Author: hairyf

File contents

Skill based on OpenZeppelin Contracts (docs as of 2026-02-09), generated from sources/openzeppelin.

OpenZeppelin Contracts is a library for secure smart contract development on EVM. Use via inheritance (e.g. ERC20, AccessControl) or using for (e.g. ECDSA, Math). Covers access control (Ownable, RBAC, AccessManager, TimelockController), tokens (ERC20, ERC721, ERC1155, ERC4626, ERC6909), upgradeable variants, and utilities (crypto, math, introspection, structures, storage).

Core References

Topic	Description	Reference
Overview	Library usage, inheritance, extending contracts	core-overview
Access Control	Ownable, AccessControl (RBAC), AccessManager, TimelockController	core-access-control
Tokens	Token standards and when to use ERC20/721/1155/4626/6909	core-tokens
ERC20	Fungible tokens, decimals, transfer, supply	core-erc20
ERC721	Non-fungible tokens, URI storage, minting	core-erc721
ERC1155	Multi-token (fungible + NFT), batch ops, safe transfer to contracts	core-erc1155
ERC4626	Tokenized vaults, shares vs assets, inflation attack mitigation	core-erc4626
ERC6909	Multi-asset (no batch/callbacks), granular approvals, extensions	core-erc6909
ERC20 Supply	Creating supply with _mint and _update, fixed and reward patterns	core-erc20-supply

Features

Upgradeable

Topic	Description	Reference
Upgradeable Contracts	contracts-upgradeable, initializers, namespaced storage	features-upgradeable

Governance & Accounts

Topic	Description	Reference
Account Abstraction	ERC-4337 stack: UserOperation, EntryPoint, Bundler, Paymaster	features-account-abstraction
Governor	On-chain governance, ERC20Votes, quorum, timelock, proposal lifecycle	features-governance
Multisig	ERC-7913 signers, threshold and weighted multisig with Account	features-multisig
Smart Accounts	ERC-4337 Account, signers, factory, UserOp, batched execution	features-accounts
EOA Delegation	EIP-7702 delegation to contracts, SignerEIP7702, authorization	features-eoa-delegation

Utilities

Topic	Description	Reference
Utilities	ECDSA, MerkleProof, Math, ERC165, structures, StorageSlot, Multicall	features-utilities

Best Practices

Topic	Description	Reference
Backwards Compatibility	Semantic versioning, storage layout, safe overrides	best-practices-backwards-compatibility
Extending Contracts	Inheritance, overrides, super, security when customizing	best-practices-extending-contracts
EOA Restriction	Why not to restrict to EOAs only; use access control instead	best-practices-eoa-restriction

---name: openzeppelin-contractsdescription: Secure smart contract library—access control, tokens (ERC20/721/1155/4626/6909), upgradeable contracts, and utilities.---> Skill based on OpenZeppelin Contracts (docs as of 2026-02-09), generated from `sources/openzeppelin`.OpenZeppelin Contracts is a library for secure smart contract development on EVM. Use via inheritance (e.g. ERC20, AccessControl) or `using for` (e.g. ECDSA, Math). Covers access control (Ownable, RBAC, AccessManager, TimelockController), tokens (ERC20, ERC721, ERC1155, ERC4626, ERC6909), upgradeable variants, and utilities (crypto, math, introspection, structures, storage).## Core References| Topic | Description | Reference ||-------|-------------|-----------|| Overview | Library usage, inheritance, extending contracts | [core-overview](references/core-overview.md) || Access Control | Ownable, AccessControl (RBAC), AccessManager, TimelockController | [core-access-control](references/core-access-control.md) || Tokens | Token standards and when to use ERC20/721/1155/4626/6909 | [core-tokens](references/core-tokens.md) || ERC20 | Fungible tokens, decimals, transfer, supply | [core-erc20](references/core-erc20.md) || ERC721 | Non-fungible tokens, URI storage, minting | [core-erc721](references/core-erc721.md) || ERC1155 | Multi-token (fungible + NFT), batch ops, safe transfer to contracts | [core-erc1155](references/core-erc1155.md) || ERC4626 | Tokenized vaults, shares vs assets, inflation attack mitigation | [core-erc4626](references/core-erc4626.md) || ERC6909 | Multi-asset (no batch/callbacks), granular approvals, extensions | [core-erc6909](references/core-erc6909.md) || ERC20 Supply | Creating supply with _mint and _update, fixed and reward patterns | [core-erc20-supply](references/core-erc20-supply.md) |## Features### Upgradeable| Topic | Description | Reference ||-------|-------------|-----------|| Upgradeable Contracts | contracts-upgradeable, initializers, namespaced storage | [features-upgradeable](references/features-upgradeable.md) |### Governance & Accounts| Topic | Description | Reference ||-------|-------------|-----------|| Account Abstraction | ERC-4337 stack: UserOperation, EntryPoint, Bundler, Paymaster | [features-account-abstraction](references/features-account-abstraction.md) || Governor | On-chain governance, ERC20Votes, quorum, timelock, proposal lifecycle | [features-governance](references/features-governance.md) || Multisig | ERC-7913 signers, threshold and weighted multisig with Account | [features-multisig](references/features-multisig.md) || Smart Accounts | ERC-4337 Account, signers, factory, UserOp, batched execution | [features-accounts](references/features-accounts.md) || EOA Delegation | EIP-7702 delegation to contracts, SignerEIP7702, authorization | [features-eoa-delegation](references/features-eoa-delegation.md) |### Utilities| Topic | Description | Reference ||-------|-------------|-----------|| Utilities | ECDSA, MerkleProof, Math, ERC165, structures, StorageSlot, Multicall | [features-utilities](references/features-utilities.md) |## Best Practices| Topic | Description | Reference ||-------|-------------|-----------|| Backwards Compatibility | Semantic versioning, storage layout, safe overrides | [best-practices-backwards-compatibility](references/best-practices-backwards-compatibility.md) || Extending Contracts | Inheritance, overrides, super, security when customizing | [best-practices-extending-contracts](references/best-practices-extending-contracts.md) || EOA Restriction | Why not to restrict to EOAs only; use access control instead | [best-practices-eoa-restriction](references/best-practices-eoa-restriction.md) |

Frequently asked questions

Openzeppelin Contracts