Run a cypher query on the ontolocy cyber knowledge graph which is expected to return a single value, for example the result of a COUNT expression, or the name property of a single node.
AI agents call run_read_query_single_value 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 explicitly runs read-only Cypher queries against a Neo4j graph database, returning a single scalar value. It is described as a read query with no write or destructive capabilities indicated. The tool name also includes 'read' explicitly. Severity is low as it only retrieves data from an internal knowledge graph.
From the tool's definition 'Run a cypher query...expected to return a single value, for example the result of a COUNT expression, or the name property of a single node'
Attacks that exploit this kind of access
Run a cypher query on the ontolocy cyber knowledge graph which is expected to return a single value, for example the result of a COUNT expression, or the name property of a single node. 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_single_value: 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_single_value 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_single_value 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_single_value. 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_single_value 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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