graph_weaken · Graph-Memory MCP: Risk & Policy

WHAT IT DOES

What graph_weaken does on Graph-Memory

AI agents use graph_weaken to create or update resources in Graph-Memory — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Graph-Memory environment.

WHY IT NEEDS A POLICY

Why graph_weaken needs a policy

Weakening an edge is a reversible modification to graph data (it can be strengthened again), placing it in the Write category. It does not delete the edge outright, so Destructive is not warranted. Misuse could degrade knowledge graph quality by systematically weakening important relationships, hence medium severity.

From the tool's definition "Decrease an edge" — modifies the weight/strength of an existing relationship in the knowledge graph

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

graph_weaken Rate-limited

graph_weaken 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "graph_weaken": {
      "limits": [
        {
          "counter": "graph_weaken_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Graph-Memory, so you can run agents against it safely.

FAQ

Questions about graph_weaken

What does the graph_weaken tool do? +

Decrease an edge. It is categorised as a Write tool in the Graph-Memory MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on graph_weaken? +

Register the Graph-Memory MCP server in PolicyLayer and add a rule for graph_weaken: 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 Graph-Memory. Nothing to install.

What risk level is graph_weaken? +

graph_weaken is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit graph_weaken? +

Yes. Add a rate_limit block to the graph_weaken 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 graph_weaken completely? +

Set action: deny in the PolicyLayer policy for graph_weaken. 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 graph_weaken? +

graph_weaken is provided by the Graph-Memory MCP server (stevepridemore/graph-memory). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.