AI agents call describe_stack_resources to retrieve information from Sceptre without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and returns information about CloudFormation stack resources. It has no side effects, does not modify state, and does not trigger any operations. It is a straightforward read operation with minimal blast radius—worst case an agent gains visibility into stack composition, which is informational only.
From the tool's definition Tool name is 'describe_stack_resources' and description states 'List the resources in a CloudFormation stack'. The verb 'list' and 'describe' are read-only operations that retrieve information about existing resources without modification.
Attacks that exploit this kind of access
List the resources in a CloudFormation stack via Sceptre. It is categorised as a Read tool in the Sceptre MCP Server, which means it retrieves data without modifying state.
Register the Sceptre MCP server in PolicyLayer and add a rule for describe_stack_resources: 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 Sceptre. Nothing to install.
describe_stack_resources 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 describe_stack_resources 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 describe_stack_resources. 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.
describe_stack_resources is provided by the Sceptre MCP server (sceptre/sceptre-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
describe_stack_resources is one line of Sceptre's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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