AI agents call energy.solar-resource 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 solar resource database and returns read-only information. It has no side effects, cannot modify data, execute code, or trigger financial transactions. The only minor consideration is that the data is returned from a pay-per-call service (2s.io), but the tool itself performs only a harmless lookup.
From the tool's definition Returns solar resource averages and irradiance data for a given latitude/longitude. No modification, deletion, or execution of external operations. Purely queries NREL NSRDB database and retrieves computed meteorological values (DNI, GHI, tilted irradiance).
Attacks that exploit this kind of access
NREL solar resource averages (NSRDB) for a lat/lon. Returns annual + monthly DNI (direct normal irradiance), GHI (global horizontal), and tilted-at-latitude irradiance in kWh/m²/day. 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 energy.solar-resource: 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.
energy.solar-resource 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 energy.solar-resource 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 energy.solar-resource. 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.
energy.solar-resource 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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