Confirmed exoplanets from the NASA Exoplanet Archive (~6k, weekly). Filter by name, hostStar, discoveryYear, or method. Returns orbital period, radius/mass (Earth units), equilibrium temp, host-star params, distance (parsecs + light-years).
AI agents call space.exoplanet to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a straightforward data retrieval tool that queries a public astronomical database and returns read-only scientific information. No data creation, modification, deletion, code execution, or financial transactions occur. The filtering and return of static exoplanet data constitutes a Read operation with minimal security risk.
From the tool's definition Tool description explicitly states it retrieves and filters data from NASA Exoplanet Archive with no modification capabilities.
Attacks that exploit this kind of access
Confirmed exoplanets from the NASA Exoplanet Archive (~6k, weekly). Filter by name, hostStar, discoveryYear, or method. Returns orbital period, radius/mass (Earth units), equilibrium temp, host-star params, distance (parsecs + light-years). It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for space.exoplanet: 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 Mcp. Nothing to install.
space.exoplanet 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 space.exoplanet 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 space.exoplanet. 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.
space.exoplanet is provided by the MCP server (@2sio/mcp). 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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