get_gas_estimate

THE RISK

Low Risk

Why get_gas_estimate needs a policy

This tool queries blockchain data to return gas cost estimates—a read-only operation with no side effects. While it operates on a financial blockchain, it does not move money, commit financial obligations, or execute transactions. The estimate is informational only. Confidence is high because the name and description are clear and unambiguous.

From the tool's definition Tool name 'get_gas_estimate' and description 'Estimate the gas cost for a transaction' indicate a query operation that retrieves cost information without modifying state or executing transactions.

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

POLICY

How to control get_gas_estimate

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_gas_estimate": {}
  }
}

get_gas_estimate is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

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EXPLORE

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Go deeper

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about get_gas_estimate

What does the get_gas_estimate tool do? +

Estimate the gas cost for a transaction on Tempo blockchain. It is categorised as a Read tool in the Tempo MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_gas_estimate? +

Register the Tempo MCP server in PolicyLayer and add a rule for get_gas_estimate: 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 Tempo. Nothing to install.

What risk level is get_gas_estimate? +

get_gas_estimate is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_gas_estimate? +

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

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

get_gas_estimate is provided by the Tempo MCP server (arome3/tempo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Tempo tool call.

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

CHECK YOUR STACK →