AI agents use create_entity_relationship to create or update resources in Forgetful — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Forgetful environment.
The tool creates a new relationship between entities in a persistent knowledge base. This is a reversible modification (relationships can be deleted via sibling delete_entity_relationship tool), so it falls under Write rather than Destructive. The empty description reduces confidence slightly, but the naming pattern and context from sibling tools clearly indicate data creation/modification.
From the tool's definition Tool name 'create_entity_relationship' indicates creation of a relationship between entities in a knowledge base.
Documented attack patterns abuse exactly the kind of access create_entity_relationship gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Forgetful, and nothing reaches the server without passing your rules. This is the rule we recommend for create_entity_relationship:
{
"version": "1",
"default": "deny",
"tools": {
"create_entity_relationship": {
"limits": [
{
"counter": "create_entity_relationship_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_entity_relationship 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_entity_relationship. It is categorised as a Write tool in the Forgetful MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Forgetful MCP server in PolicyLayer and add a rule for create_entity_relationship: 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 Forgetful. Nothing to install.
create_entity_relationship 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_entity_relationship 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_entity_relationship. 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_entity_relationship is provided by the Forgetful MCP server (scottrbk/forgetful). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 59 Forgetful tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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59 Forgetful tools catalogued and risk-classified — across an index of 42,500+ MCP servers.