forget_relationship

THE RISK

Critical Risk

Why forget_relationship needs a policy

This tool performs an irreversible deletion operation on graph data by removing edges (relationships). While the blast radius is limited to a single relationship rather than an entire graph, the destructive nature and inability to undo the operation without external recovery mechanisms places it in the Destructive category.

From the tool's definition Tool name 'forget_relationship' combined with description 'Remove an edge from the graph' indicates irreversible deletion of data. The word 'Remove' in the context of graph edges means data is being deleted and cannot be recovered without reconstruction.

Documented attack patterns abuse exactly the kind of access forget_relationship gives an agent:

POLICY

How to control forget_relationship

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Graph Engine, and nothing reaches the server without passing your rules. This is the rule we recommend for forget_relationship:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "forget_relationship"
  ]
}

forget_relationship disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register Mcp Graph Engine — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Mcp Graph Engine tools

Destructive delete_graph Delete a graph session Destructive forget Remove a node and its connected edges Destructive transitive_reduction Remove redundant transitive edges (if A->B->C and A->C exist, remove A->C) Execute stop_visualization Stop the visualization server. Execute cypher_query cypher_query Execute visualize_graph Open browser visualization at localhost URL. Updates in real-time. Write add_facts Add facts (relationships) to the graph. Nodes are auto-created if they don Write add_knowledge Add knowledge using text DSL. Format:

All 24 Mcp Graph Engine tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

Go deeper

Critical-risk tools in Mcp Graph Engine → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about forget_relationship

What does the forget_relationship tool do? +

Remove an edge from the graph. It is categorised as a Destructive tool in the Mcp Graph Engine MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on forget_relationship? +

Register the Mcp Graph Engine MCP server in PolicyLayer and add a rule for forget_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 Mcp Graph Engine. Nothing to install.

What risk level is forget_relationship? +

forget_relationship is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit forget_relationship? +

Yes. Add a rate_limit block to the forget_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.

How do I block forget_relationship completely? +

Set action: deny in the PolicyLayer policy for forget_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.

What MCP server provides forget_relationship? +

forget_relationship is provided by the Mcp Graph Engine MCP server (utilitydelta/mcp-graph-engine). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Graph Engine tool call.

Start from Mcp Graph Engine, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →