Returns full metadata for a leaf route: available facets with their valid values, data column names and units, frequency options, and date range. Call this before eia_query_route to discover valid facet IDs, facet values, column IDs, and frequency codes. Facet values are fetched from separate EIA...
Part of the Eia Energy Mcp Server server.
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AI agents call eia_describe_route to retrieve information from Eia Energy Mcp Server without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though eia_describe_route only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"eia_describe_route": {}
}
}See the full Eia Energy Mcp Server policy for all 6 tools.
These attack patterns abuse exactly the kind of access eia_describe_route gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Returns full metadata for a leaf route: available facets with their valid values, data column names and units, frequency options, and date range. Call this before eia_query_route to discover valid facet IDs, facet values, column IDs, and frequency codes. Facet values are fetched from separate EIA endpoints and merged — results are cached per-route for the process lifetime to minimize API calls.. It is categorised as a Read tool in the Eia Energy Mcp Server MCP Server, which means it retrieves data without modifying state.
Register the Eia Energy Mcp Server MCP server in PolicyLayer and add a rule for eia_describe_route: 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 Eia Energy Mcp Server. Nothing to install.
eia_describe_route 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 eia_describe_route 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 eia_describe_route. 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.
eia_describe_route is provided by the Eia Energy Mcp Server MCP server (@cyanheads/eia-energy-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 Eia Energy Mcp Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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