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OpenZeppelin

OpenZeppelin Contracts MCP Server

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by OpenZeppelin

Solidity ERC721

solidity-erc721

Generate ERC-721 non-fungible token contract source code with customizable features like minting, burning, pausing, and access control. Get the code as a Markdown block without writing to disk.

Instructions

Make a non-fungible token per the ERC-721 standard.

Returns the source code of the generated contract, formatted in a Markdown code block. Does not write to disk.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
infoNoMetadata about the contract and author
nameYesThe name of the contract
votesNoWhether to keep track of individual units for voting in on-chain governance. Voting durations can be expressed as block numbers or timestamps (defaulting to block number if not specified).
accessNoThe type of access control to provision. Ownable is a simple mechanism with a single account authorized for all privileged actions. Roles is a flexible mechanism with a separate role for each privileged action. A role can have many authorized accounts. Managed enables a central contract to define a policy that allows certain callers to access certain functions.
symbolYesThe short symbol for the token
baseUriNoA base uri for the token
burnableNoWhether token holders will be able to destroy their tokens
mintableNoWhether privileged accounts will be able to create more supply or emit more tokens
pausableNoWhether privileged accounts will be able to pause specifically marked functionality. Useful for emergency response.
enumerableNoWhether to allow on-chain enumeration of all tokens or those owned by an account. Increases gas cost of transfers.
uriStorageNoAllows updating token URIs for individual token IDs
incrementalNoWhether new tokens will be automatically assigned an incremental id
upgradeableNoWhether the smart contract is upgradeable. Transparent uses more complex proxy with higher overhead, requires less changes in your contract. Can also be used with beacons. UUPS uses simpler proxy with less overhead, requires including extra code in your contract. Allows flexibility for authorizing upgrades.
namespacePrefixNoThe prefix for ERC-7201 namespace identifiers. It should be derived from the project name or a unique naming convention specific to the project. Used only if the contract includes storage variables and upgradeability is enabled. Default is "myProject".
crossChainBridgingNoWhether to embed an ERC-7786 based bridge directly in the token contract, making it natively crosschain. Cross-chain transfers with registered counterparts burn the token on the source chain and mint it on the destination chain. If also using incremental token ids, mint only on a single chain and link counterparts without minting, otherwise colliding ids can strand bridged tokens.
crossChainLinkAllowOverrideNoWhether to allow replacing a crosschain link that has already been registered. Only used if crossChainBridging is set to "erc7786native".
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden. It explicitly discloses key behaviors: 'Returns the source code of the generated contract, formatted in a Markdown code block. Does not write to disk.' This clearly communicates that the tool is a pure generator with no file side effects, which is valuable context. Missing are details like potential network calls or state changes, but given the read-only nature, this is sufficient.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is two sentences, front-loaded with the core purpose and followed by output/behavior. Every sentence carries value with no redundancy or extra fluff.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Despite having 16 parameters and no output schema, the description provides essential context: it returns source code formatted as Markdown and has no disk side effects. Combined with the detailed schema, this is enough for an agent to understand what to expect. It does not elaborate on return structure beyond code, but that is adequately covered.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, with each parameter having a rich description. The tool description itself does not add meaning beyond the schema—it simply repeats the general purpose. Therefore, the baseline of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states 'Make a non-fungible token per the ERC-721 standard', using a specific verb and resource. It distinguishes from siblings like solidity-erc20 (fungible) and cairo-erc721 (different language). It also indicates the output (source code) and side-effect (does not write to disk).

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no explicit guidance on when to use this tool versus alternatives (e.g., other ERC standards or languages). It does not mention exclusions or prerequisites, leaving the agent to infer from the name and schema.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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