Run a cypher query on the ontolocy cyber knowledge graph which is expected to return nodes and relationships.
AI agents call run_read_query_nodes_rels to retrieve information from Ontolocy MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool executes Cypher queries against a Neo4j graph database but is scoped to read operations returning nodes and relationships. No write, delete, or modification semantics are described. Severity is medium because arbitrary Cypher read queries could potentially expose sensitive graph data or be used to infer confidential relationships, but there are no destructive capabilities indicated.
From the tool's definition 'Run a cypher query... which is expected to return nodes and relationships' — the tool is explicitly described as a read query returning graph data
Attacks that exploit this kind of access
Run a cypher query on the ontolocy cyber knowledge graph which is expected to return nodes and relationships. It is categorised as a Read tool in the Ontolocy MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Ontolocy MCP Server MCP server in PolicyLayer and add a rule for run_read_query_nodes_rels: 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 Ontolocy MCP Server. Nothing to install.
run_read_query_nodes_rels 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 run_read_query_nodes_rels 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 run_read_query_nodes_rels. 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.
run_read_query_nodes_rels is provided by the Ontolocy MCP Server MCP server (ontolocy/ontolocy-mcp-server). 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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