Physical flow across an interconnector (in_area → out_area).
Part of the Entso E server.
Free to start. No card required.
AI agents call cross_border_flow to retrieve information from Entso E 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 cross_border_flow 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": {
"cross_border_flow": {}
}
}See the full Entso E policy for all 25 tools.
These attack patterns abuse exactly the kind of access cross_border_flow 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.
Physical flow across an interconnector (in_area → out_area).. It is categorised as a Read tool in the Entso E MCP Server, which means it retrieves data without modifying state.
Register the Entso E MCP server in PolicyLayer and add a rule for cross_border_flow: 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 Entso E. Nothing to install.
cross_border_flow 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 cross_border_flow 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 cross_border_flow. 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.
cross_border_flow is provided by the Entso E MCP server (https://gateway.pipeworx.io/entso-e/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 25 Entso E tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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