graph_update_node · MCP Roo Memory MCP: Risk & Policy

WHAT IT DOES

What graph_update_node does on MCP Roo Memory

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

WHY IT NEEDS A POLICY

Why graph_update_node needs a policy

This tool modifies existing nodes in the knowledge graph but does not delete them or execute arbitrary code. Updates are typically reversible (the previous state can be restored), placing this firmly in the Write category. Severity is medium because corrupting or poisoning memory nodes could degrade system reliability and decision-making, but the impact is localized to this memory service and reversible.

From the tool's definition Tool name 'graph_update_node' and description 'Update a node' indicate modification of existing data structures within the graph-based memory system. The verb 'update' is characteristic of reversible write operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

graph_update_node Rate-limited

graph_update_node 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_update_node": {
      "limits": [
        {
          "counter": "graph_update_node_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 MCP Roo Memory, so you can run agents against it safely.

FAQ

Questions about graph_update_node

What does the graph_update_node tool do? +

Update a node. It is categorised as a Write tool in the MCP Roo 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_update_node? +

Register the MCP Roo Memory MCP server in PolicyLayer and add a rule for graph_update_node: 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 Roo Memory. Nothing to install.

What risk level is graph_update_node? +

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

Can I rate-limit graph_update_node? +

Yes. Add a rate_limit block to the graph_update_node 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_update_node completely? +

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

graph_update_node is provided by the MCP Roo Memory MCP server (mcasdfgf/mcp-roo-memory). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.