AI agents call get-gas-price to retrieve information from MetaMask MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves current blockchain state information (gas price) without modifying data, executing code, or committing financial transactions. It is a simple read-only query typical of blockchain explorers and price feeds. No blast radius from misuse; worst case is stale or incorrect pricing information used in downstream decisions by the agent.
From the tool's definition Tool name 'get-gas-price' and description 'Fetch the current price of gas (in wei)' indicate a data retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access get-gas-price gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MetaMask MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for get-gas-price:
{
"version": "1",
"default": "deny",
"tools": {
"get-gas-price": {}
}
}get-gas-price is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Fetch the current price of gas (in wei). It is categorised as a Read tool in the MetaMask MCP MCP Server, which means it retrieves data without modifying state.
Register the MetaMask MCP server in PolicyLayer and add a rule for get-gas-price: 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 MetaMask MCP. Nothing to install.
get-gas-price is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get-gas-price 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.
Set action: deny in the PolicyLayer policy for get-gas-price. 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.
get-gas-price is provided by the MetaMask MCP server (xiawpohr/metamask-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MetaMask MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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29 MetaMask MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.