Get detailed schema information for a specific dataset
AI agents call describe_dataset to retrieve information from MCP Data Catalog without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and returns metadata about a dataset's structure (schema) without querying the data itself, modifying anything, or triggering external operations. It is a pure information-retrieval function with minimal security risk. The blast radius of misuse is low—an AI agent could learn about available fields and data types, but cannot access actual data, execute code, or cause harm.
From the tool's definition Tool name: 'describe_dataset'. Description: 'Get detailed schema information for a specific dataset'. The verb 'Get' and the passive retrieval of 'schema information' indicate a read-only operation with no data modification or side effects.
Attacks that exploit this kind of access
Get detailed schema information for a specific dataset. It is categorised as a Read tool in the MCP Data Catalog MCP Server, which means it retrieves data without modifying state.
Register the MCP Data Catalog MCP server in PolicyLayer and add a rule for describe_dataset: 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 Data Catalog. Nothing to install.
describe_dataset 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 describe_dataset 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 describe_dataset. 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.
describe_dataset is provided by the MCP Data Catalog MCP server (mikeored/catalog-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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