hash_message

THE RISK

High Risk

Hashing a message is a cryptographic computation/execution operation. It doesn't read stored data, write/modify data, or cause destructive/financial effects. It runs a deterministic function on input data, making Execute the most appropriate category. Severity is low as hashing alone has no side effects.

From the tool's definition Hash a message using EIP-191 format

Documented attack patterns abuse exactly the kind of access hash_message gives an agent:

HOW TO CONTROL HASH_MESSAGE

PolicyLayer is an MCP gateway — it sits between your AI agents and BNB Chain MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for hash_message:

policy.json

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

hash_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.

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

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All 1240 BNB Chain MCP tools →

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Go deeper

High-risk tools in BNB Chain MCP → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-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.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the hash_message tool do? +

Hash a message using EIP-191 format. It is categorised as a Execute tool in the BNB Chain MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on hash_message? +

Register the BNB Chain MCP server in PolicyLayer and add a rule for hash_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 BNB Chain MCP. Nothing to install.

What risk level is hash_message? +

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

Can I rate-limit hash_message? +

Yes. Add a rate_limit block to the hash_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 hash_message completely? +

Set action: deny in the PolicyLayer policy for hash_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 hash_message? +

hash_message is provided by the BNB Chain MCP server (nirholas/bnbchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every BNB Chain MCP tool call.

Deterministic rules across all 1240 BNB Chain MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

GOVERN BNB CHAIN →

Free to start. No card required.

1240 BNB Chain MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT HASH_MESSAGE ON BNB CHAIN MCP DOES

// THE RISK

// HOW TO CONTROL HASH_MESSAGE

// EXPLORE