eth_generate_contract · Portal MCP: Risk & Policy

WHAT IT DOES

What eth_generate_contract does on PortalMCP

AI agents use eth_generate_contract to create or update resources in PortalMCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your PortalMCP environment.

WHY IT NEEDS A POLICY

Why eth_generate_contract needs a policy

This tool produces new contract code artifacts (Write category). While code generation alone is reversible and doesn't directly execute on-chain, it enables contract creation in a blockchain context where generated contracts are likely to be deployed via sibling tools.

From the tool's definition Tool generates Solidity contract code, which creates new smart contract source code artifacts. The description states 'Generate Solidity contract code' indicating code creation/writing capability.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

eth_generate_contract Rate-limited

eth_generate_contract stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "eth_generate_contract": {
      "limits": [
        {
          "counter": "eth_generate_contract_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches PortalMCP, so you can run agents against it safely.

FAQ

Questions about eth_generate_contract

What does the eth_generate_contract tool do? +

Generate Solidity contract code using Claude AI. It is categorised as a Write tool in the PortalMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on eth_generate_contract? +

Register the Portal MCP server in PolicyLayer and add a rule for eth_generate_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 PortalMCP. Nothing to install.

What risk level is eth_generate_contract? +

eth_generate_contract is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit eth_generate_contract? +

Yes. Add a rate_limit block to the eth_generate_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 eth_generate_contract completely? +

Set action: deny in the PolicyLayer policy for eth_generate_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 eth_generate_contract? +

eth_generate_contract is provided by the Portal MCP server (portalfnd/portalmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.