cross-chain-asset-transfer

THE RISK

Critical Risk

Why cross-chain-asset-transfer needs a policy

Asset transfers move value and commit financial obligations irreversibly. This is the most severe category (Financial > Destructive > Execute > Write > Read). While the actual blockchain transaction immutability makes it somewhat 'destructive,' the primary intent is financial value transfer, and an AI agent misusing this could cause significant financial loss.

From the tool's definition Tool description explicitly states it 'Transfers tokens/assets between multiple blockchain networks' - moving assets between blockchains is a financial operation that commits value transfer obligations.

Documented attack patterns abuse exactly the kind of access cross-chain-asset-transfer gives an agent:

POLICY

How to control cross-chain-asset-transfer

PolicyLayer is an MCP gateway — it sits between your AI agents and Hyperlane MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for cross-chain-asset-transfer:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "cross-chain-asset-transfer": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to cross-chain-asset-transfer is blocked until a human approves it. The rest of the server keeps working.

Create a free account and register Hyperlane MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

GATE THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Hyperlane MCP Server tools

Execute deploy-chain Deploys a new chain to the Hyperlane network. Execute deploy-warp-route Deploys a warp route. Execute run-relayer Runs a relayer for specified chains. Execute run-validator Runs a validator for a specific chain. Execute cross-chain-message-transfer Transfers a cross-chain message.

All 6 Hyperlane MCP Server tools →

Financial tools on other servers

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Go deeper

Critical-risk tools in Hyperlane MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about cross-chain-asset-transfer

What does the cross-chain-asset-transfer tool do? +

Transfers tokens/assets between multiple blockchain networks using Hyperlane. It is categorised as a Financial tool in the Hyperlane MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on cross-chain-asset-transfer? +

Register the Hyperlane MCP Server MCP server in PolicyLayer and add a rule for cross-chain-asset-transfer: 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 Hyperlane MCP Server. Nothing to install.

What risk level is cross-chain-asset-transfer? +

cross-chain-asset-transfer is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit cross-chain-asset-transfer? +

Yes. Add a rate_limit block to the cross-chain-asset-transfer 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 cross-chain-asset-transfer completely? +

Set action: deny in the PolicyLayer policy for cross-chain-asset-transfer. 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 cross-chain-asset-transfer? +

cross-chain-asset-transfer is provided by the Hyperlane MCP Server MCP server (suryansh-23/hyperlane-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Hyperlane MCP Server tool call.

Start from Hyperlane MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →