estimate_cost

THE RISK

Low Risk

Why estimate_cost needs a policy

This tool performs cost estimation—a calculation or lookup that returns projected pricing information. It does not charge money, modify billing records, commit financial obligations, or trigger actual payments. The tool is informational in nature, similar to 'check_balance' (a sibling tool), making it a Read operation with low severity risk.

From the tool's definition Tool name 'estimate_cost' and description 'Estimate the cost of a given number of API calls for the current workspace' indicate a read-only operation that retrieves or calculates cost information without modifying any data, executing commands, or affecting…

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

POLICY

How to control estimate_cost

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

policy.json

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

estimate_cost 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 APIClaw — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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FAQ

Questions about estimate_cost

What does the estimate_cost tool do? +

Estimate the cost of a given number of API calls for the current workspace. It is categorised as a Read tool in the APIClaw MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on estimate_cost? +

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

What risk level is estimate_cost? +

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

Can I rate-limit estimate_cost? +

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

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

estimate_cost is provided by the APIClaw MCP server (nordsym/apiclaw). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every APIClaw tool call.

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

CHECK YOUR STACK →