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.
AI agents call sparql_list_entity_types to retrieve information from OpenLink MCP Server for ODBC without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only SPARQL query to list entity types in an RDF graph. It has no side effects—it only queries and returns schema/metadata information. The LIMIT clause and filtering indicate a constrained retrieval operation. No data modification, deletion, code execution, or financial implications are present.
From the tool's definition Tool 'sparql_list_entity_types' retrieves entity types from an RDF graph with a LIMIT clause, returning labels and comments. The description explicitly states it 'retrieves' data with no mention of modification, deletion, or execution of arbitrary operations.
Attacks that exploit this kind of access
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 OpenLink MCP Server for ODBC MCP Server, which means it retrieves data without modifying state.
Register the OpenLink MCP Server for 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 OpenLink MCP Server for ODBC. Nothing to install.
sparql_list_entity_types 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 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.
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.
sparql_list_entity_types is provided by the OpenLink MCP Server for ODBC MCP server (pvsmark/pvs-odbc-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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