attach_flow_model · Nocobase MCP: Risk & Policy

WHAT IT DOES

What attach_flow_model does on Nocobase

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

WHY IT NEEDS A POLICY

Why attach_flow_model needs a policy

This tool creates or modifies data relationships in a reversible way (attaching a block to a parent). It does not execute arbitrary code, delete data, or perform financial operations. The action is reversible (can be detached), making it Write rather than Destructive.

From the tool's definition Tool description states 'Attach an existing flowPage block/model to a parent' and 'add an existing block into a flowPage container at a specific position.' These actions modify the structure and configuration of UI/flow models by creating new associations or…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

attach_flow_model Rate-limited

attach_flow_model 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": {
    "attach_flow_model": {
      "limits": [
        {
          "counter": "attach_flow_model_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 Nocobase, so you can run agents against it safely.

FAQ

Questions about attach_flow_model

What does the attach_flow_model tool do? +

Attach an existing flowPage block/model to a parent. Use this to add an existing block into a flowPage container at a specific position. It is categorised as a Write tool in the Nocobase MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on attach_flow_model? +

Register the Nocobase MCP server in PolicyLayer and add a rule for attach_flow_model: 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 Nocobase. Nothing to install.

What risk level is attach_flow_model? +

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

Can I rate-limit attach_flow_model? +

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

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

attach_flow_model is provided by the Nocobase MCP server (puguhsudarma/nocobase-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.