AI agents call list_castables to retrieve information from SAS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only operation that retrieves information about tables in a CAS (Cloud Analytic Services) library. It has no side effects, does not modify data, and does not execute code or trigger external operations. It falls squarely into the Read category with low severity due to minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'list_castables' and description 'List tables in a CAS library' indicate a query operation that retrieves metadata about available tables without modifying, deleting, or executing any operations.
Documented attack patterns abuse exactly the kind of access list_castables gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SAS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_castables:
{
"version": "1",
"default": "deny",
"tools": {
"list_castables": {}
}
}list_castables is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List tables in a CAS library. It is categorised as a Read tool in the SAS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the SAS MCP Server MCP server in PolicyLayer and add a rule for list_castables: 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 SAS MCP Server. Nothing to install.
list_castables 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 list_castables 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 list_castables. 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.
list_castables is provided by the SAS MCP Server MCP server (sassoftware/sas-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from SAS MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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27 SAS MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.