Aggregate per-card games/wins and maindeck counts from cube records (requires auth for private cubes)
AI agents call compute_card_stats_for_cube to retrieve information from CubeCobra 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 and aggregates statistical data (games, wins, deck counts) from cube records for analysis purposes. It has no side effects, does not execute arbitrary code, does not modify data, and does not involve financial transactions. The authentication requirement for private cubes is a standard access control, not a capability risk. This is a pure Read operation.
From the tool's definition Tool description states 'Aggregate per-card games/wins and maindeck counts from cube records' — it reads and summarizes existing data without modifying, creating, or deleting anything.
Attacks that exploit this kind of access
Aggregate per-card games/wins and maindeck counts from cube records (requires auth for private cubes). It is categorised as a Read tool in the CubeCobra MCP Server MCP Server, which means it retrieves data without modifying state.
Register the CubeCobra MCP Server MCP server in PolicyLayer and add a rule for compute_card_stats_for_cube: 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 CubeCobra MCP Server. Nothing to install.
compute_card_stats_for_cube 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 compute_card_stats_for_cube 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 compute_card_stats_for_cube. 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.
compute_card_stats_for_cube is provided by the CubeCobra MCP Server MCP server (plrdev/cubecobra-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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