AI agents call search_laws to retrieve information from e-Gov Law MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves legal information with no side effects. The server's core purpose is data retrieval for legal research, and the tool name combined with its sibling tools (which are explicitly read operations like 'get_law_content' and 'find_law_article') indicates this is a search/query function. No data is created, modified, deleted, or executed.
From the tool's definition Tool name 'search_laws' on a legal research server that 'enables intelligent search and retrieval of Japanese legal statutes.' Sibling tools include 'search_laws_by_keyword', 'find_law_article', 'get_law_content', and 'batch_find_articles'—all read operations.
Documented attack patterns abuse exactly the kind of access search_laws gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and e-Gov Law MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for search_laws:
{
"version": "1",
"default": "deny",
"tools": {
"search_laws": {}
}
}search_laws is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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search_laws. It is categorised as a Read tool in the e-Gov Law MCP Server MCP Server, which means it retrieves data without modifying state.
Register the e-Gov Law MCP Server MCP server in PolicyLayer and add a rule for search_laws: 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 e-Gov Law MCP Server. Nothing to install.
search_laws 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 search_laws 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 search_laws. 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.
search_laws is provided by the e-Gov Law MCP Server MCP server (ryoooo/e-gov-law-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from e-Gov Law MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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8 e-Gov Law MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.