eth_sendRawTransaction · EVM MCP Server MCP: Risk & Policy

WHAT IT DOES

What eth_sendRawTransaction does on EVM MCP Server

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

WHY IT NEEDS A POLICY

Why eth_sendRawTransaction needs a policy

An AI agent can call eth_sendRawTransaction faster than any human can review — one bad instruction and it creates or modifies resources in EVM MCP Server by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

eth_sendRawTransaction Rate-limited

eth_sendRawTransaction 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_sendRawTransaction": {
      "limits": [
        {
          "counter": "eth_sendrawtransaction_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 EVM MCP Server, so you can run agents against it safely.

FAQ

Questions about eth_sendRawTransaction

What does the eth_sendRawTransaction tool do? +

Creates new message call transaction or a contract creation. It is categorised as a Write tool in the EVM MCP Server 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_sendRawTransaction? +

Register the EVM MCP Server MCP server in PolicyLayer and add a rule for eth_sendRawTransaction: 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 eth_sendRawTransaction? +

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

Can I rate-limit eth_sendRawTransaction? +

Yes. Add a rate_limit block to the eth_sendRawTransaction 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_sendRawTransaction completely? +

Set action: deny in the PolicyLayer policy for eth_sendRawTransaction. 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_sendRawTransaction? +

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