List all your personal paper libraries/collections in ADS.
AI agents call list_libraries to retrieve information from NASA ADS 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 displays metadata about the user's existing paper libraries. It performs a read-only query operation with no destructive, write, or execution capabilities. The blast radius is minimal—misuse would only expose the user's own library organization, not cause irreversible changes or external operations. Low severity is appropriate for information disclosure of personal metadata.
From the tool's definition Tool name 'list_libraries' combined with description 'List all your personal paper libraries/collections in ADS' indicates a retrieval operation that queries existing data without modification or side effects.
Documented attack patterns abuse exactly the kind of access list_libraries gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and NASA ADS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_libraries:
{
"version": "1",
"default": "deny",
"tools": {
"list_libraries": {}
}
}list_libraries is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all your personal paper libraries/collections in ADS. It is categorised as a Read tool in the NASA ADS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the NASA ADS MCP Server MCP server in PolicyLayer and add a rule for list_libraries: 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 NASA ADS MCP Server. Nothing to install.
list_libraries 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_libraries 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_libraries. 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_libraries is provided by the NASA ADS MCP Server MCP server (prtc/nasa-ads-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from NASA ADS MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
10 NASA ADS MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.