is_contract

Check if an address is a smart contract or an externally owned account (EOA)

SERVEREVM MCP Server SOURCEchulanpro5/evm-mcp-server

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/chulanpro5-evm-mcp-server/is-contract.md

WHAT IT DOES

What is_contract does on EVM MCP Server

AI agents call is_contract to retrieve information from EVM MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why is_contract is rated Low

This tool performs only data retrieval by querying the blockchain to determine whether an address is a contract or EOA. It has no capability to modify, execute, delete, or transfer any assets. The operation is read-only and carries minimal risk.

From the tool's definition Tool description states 'Check if an address is a smart contract or an externally owned account (EOA)' - a pure query operation that retrieves blockchain state without side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs is_contract safely

PolicyLayer is an MCP gateway: it sits between your AI agents and EVM MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For is_contract, this is the rule to start with:

is_contract Allowed

is_contract is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "is_contract": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect EVM MCP Server, apply this rule, and every is_contract call is checked against it from then on.

FAQ

Questions about is_contract

What does the is_contract tool do? +

Check if an address is a smart contract or an externally owned account (EOA). It is categorised as a Read tool in the EVM MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on is_contract? +

Register the EVM MCP Server MCP server in PolicyLayer and add a rule for is_contract: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches EVM MCP Server. Nothing to install.

What risk level is is_contract? +

is_contract is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit is_contract? +

Yes. Add a rate_limit block to the is_contract rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block is_contract completely? +

Set action: deny in the PolicyLayer policy for is_contract. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides is_contract? +

is_contract is provided by the EVM MCP Server MCP server (chulanpro5/evm-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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