List custom fields and their Enums/IDs for Leads or Contacts. Highly recommended before creating or updating complex leads.
AI agents call list_custom_fields to retrieve information from Kommo MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves metadata about custom fields in the Kommo CRM system. It performs a read-only operation that returns structured field definitions and enumerations. There is no data creation, modification, deletion, or external execution involved. The recommendation to use it 'before creating or updating' further confirms it is a preparatory lookup utility, not an action that modifies state.
From the tool's definition Tool name 'list_custom_fields' and description explicitly states it 'List custom fields and their Enums/IDs' — a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
List custom fields and their Enums/IDs for Leads or Contacts. Highly recommended before creating or updating complex leads. It is categorised as a Read tool in the Kommo MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Kommo MCP Server MCP server in PolicyLayer and add a rule for list_custom_fields: 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 Kommo MCP Server. Nothing to install.
list_custom_fields is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_custom_fields 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.
Set action: deny in the PolicyLayer policy for list_custom_fields. 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.
list_custom_fields is provided by the Kommo MCP Server MCP server (wdavidce/kommo-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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