lookup_card
AI agents call lookup_card to retrieve information from Cz Mtg Compare without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves card price information across multiple shops without modifying data, creating transactions, executing code, or deleting anything. It fits the 'Read' category as a query operation. Low severity because misuse (e.g., querying repeatedly) poses minimal harm compared to financial or destructive actions available via other sibling tools.
From the tool's definition Tool name 'lookup_card' paired with sibling tools like 'search_card' and server description stating it 'compare[s]...prices' and 'returns a normalized, price-sorted list' indicates data retrieval with no side effects.
Attacks that exploit this kind of access
lookup_card. It is categorised as a Read tool in the Cz Mtg Compare MCP Server, which means it retrieves data without modifying state.
Register the Cz Mtg Compare MCP server in PolicyLayer and add a rule for lookup_card: 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 Cz Mtg Compare. Nothing to install.
lookup_card 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_card 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_card. 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_card is provided by the Cz Mtg Compare MCP server (xvyslo05/czech-mtg-price-comparator-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.
Teams ship this data inside their own products. See what a licence covers →