Create multiple new relations between entities in the knowledge graph. Relations should be in active voice
AI agents use create_relations to create or update resources in Elasticsearch Knowledge Graph for MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Elasticsearch Knowledge Graph for MCP environment.
This tool creates new relations in the knowledge graph, which modifies the graph structure by adding connections between entities. This is a Write operation because it creates data reversibly without permanent deletion or destruction.
From the tool's definition Tool name 'create_relations' and description 'Create multiple new relations between entities' indicate data modification. The action is reversible via 'delete_relations' (a sibling tool), classifying it as Write rather than Destructive.
Documented attack patterns abuse exactly the kind of access create_relations gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Elasticsearch Knowledge Graph for MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for create_relations:
{
"version": "1",
"default": "deny",
"tools": {
"create_relations": {
"limits": [
{
"counter": "create_relations_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_relations stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Create multiple new relations between entities in the knowledge graph. Relations should be in active voice. It is categorised as a Write tool in the Elasticsearch Knowledge Graph for MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Elasticsearch Knowledge Graph for MCP server in PolicyLayer and add a rule for create_relations: 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 Elasticsearch Knowledge Graph for MCP. Nothing to install.
create_relations is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_relations 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 create_relations. 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.
create_relations is provided by the Elasticsearch Knowledge Graph for MCP server (j3k0/mcp-brain-tools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Elasticsearch Knowledge Graph for MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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23 Elasticsearch Knowledge Graph for MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.