Delete a relationship from the knowledge graph
AI agents call delete_relation to permanently remove resources in LightRAG MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes a relationship from the knowledge graph, which cannot be undone. Deletion of graph edges is irreversible and represents data loss. While not as critical as deleting all documents, deletion of individual relationships still constitutes a destructive operation warranting high severity due to potential loss of important semantic connections in the knowledge base.
From the tool's definition Tool name 'delete_relation' and description 'Delete a relationship from the knowledge graph' explicitly perform irreversible deletion of data structures (relationships/edges in a knowledge graph).
Attacks that exploit this kind of access
Delete a relationship from the knowledge graph. It is categorised as a Destructive tool in the LightRAG MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the LightRAG MCP Server MCP server in PolicyLayer and add a rule for delete_relation: 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 LightRAG MCP Server. Nothing to install.
delete_relation is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the delete_relation 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 delete_relation. 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.
delete_relation is provided by the LightRAG MCP Server MCP server (lalitsuryan/lightragmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
delete_relation is one line of LightRAG MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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