fluentcrm_attach_contact_to_list

THE RISK

Medium Risk

Why fluentcrm_attach_contact_to_list needs a policy

This tool creates or modifies a relationship between a contact and a list in FluentCRM. It performs a reversible data modification (attachment can typically be removed). It is not destructive (the operation is undoable), not financial, and not execute-class.

From the tool's definition Tool name 'fluentcrm_attach_contact_to_list' and description 'Przypisuje kontakt do listy' (Polish: 'Assigns contact to list') indicate the tool modifies contact-list associations by adding/attaching data.

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

POLICY

How to control fluentcrm_attach_contact_to_list

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

policy.json

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

fluentcrm_attach_contact_to_list 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.

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

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about fluentcrm_attach_contact_to_list

What does the fluentcrm_attach_contact_to_list tool do? +

Przypisuje kontakt do listy. It is categorised as a Write tool in the FluentCRM MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on fluentcrm_attach_contact_to_list? +

Register the FluentCRM MCP Server MCP server in PolicyLayer and add a rule for fluentcrm_attach_contact_to_list: 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 FluentCRM MCP Server. Nothing to install.

What risk level is fluentcrm_attach_contact_to_list? +

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

Can I rate-limit fluentcrm_attach_contact_to_list? +

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

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

fluentcrm_attach_contact_to_list is provided by the FluentCRM MCP Server MCP server (netflyapp/fluentcrm-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every FluentCRM MCP Server tool call.

Start from FluentCRM MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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