AI agents call get_apod to retrieve information from Nasa without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a simple read operation—retrieving publicly available astronomy imagery and metadata from NASA's open APIs. There is no data creation, modification, deletion, code execution, or financial transaction involved. The blast radius of misuse is negligible, as the tool only returns read-only observational data that is already public.
From the tool's definition The tool 'get_apod' retrieves NASA's Astronomy Picture of the Day, which is a query/fetch operation. The description uses 'Get', indicating data retrieval with no modification or side effects.
Documented attack patterns abuse exactly the kind of access get_apod gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Nasa, and nothing reaches the server without passing your rules. This is the rule we recommend for get_apod:
{
"version": "1",
"default": "deny",
"tools": {
"get_apod": {}
}
}get_apod is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get NASA's Astronomy Picture of the Day. It is categorised as a Read tool in the Nasa MCP Server, which means it retrieves data without modifying state.
Register the Nasa MCP server in PolicyLayer and add a rule for get_apod: 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. Nothing to install.
get_apod 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 get_apod 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 get_apod. 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.
get_apod is provided by the Nasa MCP server (jezweb/nasa-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Nasa, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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11 Nasa tools catalogued and risk-classified — across an index of 43,000+ MCP servers.