compute_performances_and_costs
AI agents call compute_performances_and_costs to retrieve information from AWS without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name implies computation and retrieval of performance and cost data, which aligns with Read category (queries data, no side effects). However, confidence is moderate (0.6) because the description is empty, leaving some ambiguity about whether this performs simple retrieval or triggers complex backend calculations.
From the tool's definition Tool name 'compute_performances_and_costs' suggests querying or calculating metrics; no verbs indicating modification (create, update, delete) or execution of arbitrary operations.
Documented attack patterns abuse exactly the kind of access compute_performances_and_costs gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and AWS, and nothing reaches the server without passing your rules. This is the rule we recommend for compute_performances_and_costs:
{
"version": "1",
"default": "deny",
"tools": {
"compute_performances_and_costs": {}
}
}compute_performances_and_costs is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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compute_performances_and_costs. It is categorised as a Read tool in the AWS MCP Server, which means it retrieves data without modifying state.
Register the AWS MCP server in PolicyLayer and add a rule for compute_performances_and_costs: 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 AWS. Nothing to install.
compute_performances_and_costs 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 compute_performances_and_costs 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 compute_performances_and_costs. 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.
compute_performances_and_costs is provided by the AWS MCP server (@awslabs/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from AWS, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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300 AWS tools catalogued and risk-classified — across an index of 43,000+ MCP servers.