AI agents call describe_metastore to retrieve information from Databricks 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 a Databricks metastore without making any changes. It is a read-only operation that retrieves information about the metastore configuration and properties. The blast radius of misuse is minimal—an attacker could only gather information about the metastore structure, not modify or delete data.
From the tool's definition Tool name 'describe_metastore' and description 'Get detailed metastore information' indicate a retrieval operation with no modification, creation, or deletion of data.
Documented attack patterns abuse exactly the kind of access describe_metastore gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Databricks MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for describe_metastore:
{
"version": "1",
"default": "deny",
"tools": {
"describe_metastore": {}
}
}describe_metastore is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get detailed metastore information. It is categorised as a Read tool in the Databricks MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Databricks MCP Server MCP server in PolicyLayer and add a rule for describe_metastore: 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 Databricks MCP Server. Nothing to install.
describe_metastore 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_metastore 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_metastore. 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_metastore is provided by the Databricks MCP Server MCP server (pulkitxchadha/awesome-databricks-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Databricks MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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86 Databricks MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.