Find EventBridge rules with no invocations.
AI agents call find_unused_eventbridge_rules to retrieve information from AWS FinOps MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and analyzes AWS EventBridge metrics to identify unused rules. It performs a read-only query operation (discovering infrastructure state) without creating, modifying, deleting, or executing any resources. The severity is low because misuse would only surface incorrect information, not cause harm to infrastructure or data.
From the tool's definition Tool name and description indicate 'find' and 'no invocations' — a query/search operation that identifies unused EventBridge rules by reading metrics and configuration data, with no side effects or modifications.
Attacks that exploit this kind of access
Find EventBridge rules with no invocations. It is categorised as a Read tool in the AWS FinOps MCP Server MCP Server, which means it retrieves data without modifying state.
Register the AWS FinOps MCP Server MCP server in PolicyLayer and add a rule for find_unused_eventbridge_rules: 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 FinOps MCP Server. Nothing to install.
find_unused_eventbridge_rules 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 find_unused_eventbridge_rules 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 find_unused_eventbridge_rules. 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.
find_unused_eventbridge_rules is provided by the AWS FinOps MCP Server MCP server (prashantgupta123/aws-pillar-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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