sparql_list_entity_types

ServerMcp Odbc
CategoryRead

How to control sparql_list_entity_types ↓

WHAT IT DOES

What sparql_list_entity_types does on Mcp Odbc

AI agents call sparql_list_entity_types to retrieve information from Mcp Odbc without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why sparql_list_entity_types needs a policy

This tool performs a read-only query operation that retrieves metadata (entity types, labels, comments) from an RDF graph. It has no side effects, creates no resources, executes no code, and cannot modify or delete data.

From the tool's definition The tool 'sparql_list_entity_types' retrieves entity types from an RDF graph, with descriptions explicitly stating it 'filters out blank nodes' and 'returns' labeled data with a LIMIT clause.

Documented attack patterns abuse exactly the kind of access sparql_list_entity_types gives an agent:

POLICY

How to control sparql_list_entity_types

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Odbc, and nothing reaches the server without passing your rules. This is the rule we recommend for sparql_list_entity_types:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sparql_list_entity_types": {}
  }
}

sparql_list_entity_types is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Mcp Odbc — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Mcp Odbc tools

Execute query_database Execute a SQL query and return results in JSON, JSONL or MD format. Execute query_database_jsonl Execute a SQL query and return results in JSONL format. Execute query_database_md Execute a SQL query and return results in MD format. Execute spasql_query Execute a SPASQL query and return results. Execute virtuoso_support_ai Tool to use the Virtuoso AI support function Execute chat_prompt_complete Tool to use the OPAL backend to complete chat prompt Read describe_table Retrieve and return a dictionary containing the definition of a table, including column na Read filter_table_names Retrieve and return a list containing information about tables whose names contain the sub

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about sparql_list_entity_types

What does the sparql_list_entity_types tool do? +

This query retrieves all entity types in the RDF graph, along with their labels and comments if available. It filters out blank nodes and ensures that only IRI types are returned. The LIMIT clause is set to 100 to restrict the number of entity types returned. It is categorised as a Read tool in the Mcp Odbc MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on sparql_list_entity_types? +

Register the Mcp Odbc MCP server in PolicyLayer and add a rule for sparql_list_entity_types: 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 Odbc. Nothing to install.

What risk level is sparql_list_entity_types? +

sparql_list_entity_types is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit sparql_list_entity_types? +

Yes. Add a rate_limit block to the sparql_list_entity_types 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.

How do I block sparql_list_entity_types completely? +

Set action: deny in the PolicyLayer policy for sparql_list_entity_types. 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.

What MCP server provides sparql_list_entity_types? +

sparql_list_entity_types is provided by the Mcp Odbc MCP server (openlinksoftware/mcp-odbc-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Odbc tool call.

Start from Mcp Odbc, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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