createCustomField · Follow Up Boss MCP Server MCP

WHAT IT DOES

What createCustomField does on Follow Up Boss MCP Server

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

WHY IT NEEDS A POLICY

Why createCustomField needs a policy

This tool creates new custom fields in the Follow Up Boss CRM, which is a reversible write operation. It adds configuration/metadata to the system but does not delete data, execute arbitrary code, move money, or cause irreversible changes.

From the tool's definition Tool name is "createCustomField" and description states "Create a custom field". The word "Create" indicates a write operation that adds new data to the system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

createCustomField Rate-limited

createCustomField 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": {
    "createCustomField": {
      "limits": [
        {
          "counter": "createcustomfield_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 Follow Up Boss MCP Server, so you can run agents against it safely.

FAQ

Questions about createCustomField

What does the createCustomField tool do? +

Create a custom field. It is categorised as a Write tool in the Follow Up Boss 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 createCustomField? +

Register the Follow Up Boss MCP Server MCP server in PolicyLayer and add a rule for createCustomField: 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 Follow Up Boss MCP Server. Nothing to install.

What risk level is createCustomField? +

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

Can I rate-limit createCustomField? +

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

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

createCustomField is provided by the Follow Up Boss MCP Server MCP server (nerdsnipe-inc/follow-up-boss-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.