eip7702_build_designator · Tenzro Ledger MCP: Risk & Policy

WHAT IT DOES

What eip7702_build_designator does on Tenzro Ledger MCP

AI agents use eip7702_build_designator to create or update resources in Tenzro Ledger MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Tenzro Ledger MCP environment.

WHY IT NEEDS A POLICY

Why eip7702_build_designator needs a policy

EIP-7702 allows EOAs to temporarily delegate code execution to a contract. Building the designator is a construction/write step that prepares authorization data. It does not itself execute or commit a transaction, but it creates a critical data structure used in account delegation.

From the tool's definition 'Build the 23-byte EIP-7702 designator' — constructs an EIP-7702 authorization designator, which is a preparatory artifact for EIP-7702 account delegation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

eip7702_build_designator Rate-limited

eip7702_build_designator 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": {
    "eip7702_build_designator": {
      "limits": [
        {
          "counter": "eip7702_build_designator_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 Tenzro Ledger MCP, so you can run agents against it safely.

FAQ

Questions about eip7702_build_designator

What does the eip7702_build_designator tool do? +

Build the 23-byte EIP-7702 designator. It is categorised as a Write tool in the Tenzro Ledger MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on eip7702_build_designator? +

Register the Tenzro Ledger MCP server in PolicyLayer and add a rule for eip7702_build_designator: 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 Tenzro Ledger MCP. Nothing to install.

What risk level is eip7702_build_designator? +

eip7702_build_designator is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit eip7702_build_designator? +

Yes. Add a rate_limit block to the eip7702_build_designator 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 eip7702_build_designator completely? +

Set action: deny in the PolicyLayer policy for eip7702_build_designator. 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 eip7702_build_designator? +

eip7702_build_designator is provided by the Tenzro Ledger MCP server (https://canton-mcp.tenzro.network/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.