Best single-call rulebook lookup for natural-language rule questions (e.g.
AI agents call lookup_rule to retrieve information from TDC 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 rule information from a rulebook without modifying data or triggering external operations. It is a read-only query operation with minimal blast radius if misused—at worst, an agent might retrieve irrelevant or excessive rulebook entries, but no data corruption, financial impact, or destructive effects are possible.
From the tool's definition Tool name 'lookup_rule' and description indicate a rulebook lookup function for querying rule information. The term 'lookup' and the context of querying a rulebook for rule answers are consistent with retrieval/query operations.
Attacks that exploit this kind of access
Best single-call rulebook lookup for natural-language rule questions (e.g. It is categorised as a Read tool in the TDC MCP Server MCP Server, which means it retrieves data without modifying state.
Register the TDC MCP Server MCP server in PolicyLayer and add a rule for lookup_rule: 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 TDC MCP Server. Nothing to install.
lookup_rule 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 lookup_rule 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 lookup_rule. 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.
lookup_rule is provided by the TDC MCP Server MCP server (truedungeoncompanion/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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