relay_cross_chain_message · JS-Peer x DeFi MCP Server MCP

WHAT IT DOES

What relay_cross_chain_message does on JS-Peer x DeFi MCP Server

AI agents invoke relay_cross_chain_message to trigger actions in JS-Peer x DeFi MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why relay_cross_chain_message needs a policy

Relaying a cross-chain message is an active external operation that dispatches a transaction or payload across blockchain networks. The effect is determined by the message arguments and can trigger arbitrary on-chain actions (e.g., contract calls, token transfers, governance actions). This places it firmly in Execute, potentially bordering on Financial depending on message content.

From the tool's definition 'Relay a message between different blockchain networks' — triggers an external cross-chain operation whose effects depend on the message content and target chain

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

relay_cross_chain_message Rate-limited

relay_cross_chain_message stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "relay_cross_chain_message": {
      "limits": [
        {
          "counter": "relay_cross_chain_message_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches JS-Peer x DeFi MCP Server, so you can run agents against it safely.

FAQ

Questions about relay_cross_chain_message

What does the relay_cross_chain_message tool do? +

Relay a message between different blockchain networks. It is categorised as a Execute tool in the JS-Peer x DeFi MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on relay_cross_chain_message? +

Register the JS-Peer x DeFi MCP Server MCP server in PolicyLayer and add a rule for relay_cross_chain_message: 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 JS-Peer x DeFi MCP Server. Nothing to install.

What risk level is relay_cross_chain_message? +

relay_cross_chain_message is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit relay_cross_chain_message? +

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

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

relay_cross_chain_message is provided by the JS-Peer x DeFi MCP Server MCP server (nkovaturient/js-peer-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.