This query retrieves samples of entities for each type in the RDF graph, along with their labels and counts. It groups by entity type and orders the results by sample count in descending order. Note: The LIMIT clause is set to 20 to restrict the number of entity types returned.
AI agents call sparql_list_entity_types_samples 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 SPARQL query to explore and retrieve metadata about RDF entity types, their samples, labels, and counts. It reads data from the graph without modifying, deleting, or executing arbitrary code. The operation is inherently non-destructive and non-modifying, making it a Read category tool.
From the tool's definition Tool description states 'retrieves samples of entities' and 'orders the results' — these are query and retrieval operations with no side effects. The SPARQL query groups and limits results, typical of read-only exploration.
Attacks that exploit this kind of access
This query retrieves samples of entities for each type in the RDF graph, along with their labels and counts. It groups by entity type and orders the results by sample count in descending order. Note: The LIMIT clause is set to 20 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_samples: 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_samples 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_samples 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_samples. 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_samples 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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