AI agents call list_datasets to retrieve information from Cryo MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns metadata about available datasets without executing code, modifying data, or triggering external operations. It is a straightforward information retrieval operation with minimal risk if misused by an AI agent—at worst, an agent learns what datasets exist. This fits squarely in the Read category with low severity.
From the tool's definition Tool name 'list_datasets' and description 'Return a list of all available cryo datasets' indicate a retrieval operation with no modification or execution of code. The verb 'list' and the passive data enumeration confirm read-only behavior.
Documented attack patterns abuse exactly the kind of access list_datasets gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Cryo MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_datasets:
{
"version": "1",
"default": "deny",
"tools": {
"list_datasets": {}
}
}list_datasets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Return a list of all available cryo datasets. It is categorised as a Read tool in the Cryo MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Cryo MCP Server MCP server in PolicyLayer and add a rule for list_datasets: 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 Cryo MCP Server. Nothing to install.
list_datasets 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 list_datasets 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 list_datasets. 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.
list_datasets is provided by the Cryo MCP Server MCP server (z80dev/cryo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 10 Cryo MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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10 Cryo MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.