Find properties in the ontology. Can filter by pattern, domain, or range.
AI agents call search_properties to retrieve information from RDF4J 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 RDF ontology metadata (properties) based on filter criteria (pattern, domain, range). It retrieves information about the knowledge graph schema without executing arbitrary code, modifying data, or deleting resources. The read-only nature is confirmed by the context of sibling Read tools that explore RDF data structure and schema without side effects.
From the tool's definition Tool description states 'Find properties in the ontology' with filtering capabilities. The word 'find' indicates data retrieval without modification.
Attacks that exploit this kind of access
Find properties in the ontology. Can filter by pattern, domain, or range. It is categorised as a Read tool in the RDF4J MCP Server MCP Server, which means it retrieves data without modifying state.
Register the RDF4J MCP Server MCP server in PolicyLayer and add a rule for search_properties: 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 RDF4J MCP Server. Nothing to install.
search_properties 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 search_properties 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 search_properties. 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.
search_properties is provided by the RDF4J MCP Server MCP server (odysa/rdf4j-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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