AI agents call law.opinion 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 tool queries and retrieves publicly available US court opinions by ID or citation, returning plain text and metadata. It performs no modifications, deletions, code execution, or financial transactions. The data retrieved is already public and immutable. The read-only nature and absence of side effects place this firmly in the Read category with low severity.
From the tool's definition Tool description: 'Fetch the full text of a US court opinion' — the verb 'Fetch' and use case (retrieving published court opinions) indicate read-only data retrieval with no side effects.
Attacks that exploit this kind of access
Fetch the full text of a US court opinion by CourtListener opinion ID OR by citation. Returns plain text + case metadata. Supply exactly one of opinionId or citation. 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 law.opinion: 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.
law.opinion 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 law.opinion 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 law.opinion. 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.
law.opinion 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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