clickup_get_custom_fields

THE RISK

Low Risk

Why clickup_get_custom_fields needs a policy

This tool only retrieves metadata about custom fields in a ClickUp list. It performs no modifications, deletions, or executions. The blast radius of misuse is minimal—an agent could only enumerate field configurations, which is information disclosure at worst but does not alter state or enable further damage without companion tools.

From the tool's definition Tool name contains 'get' and description states 'Retrieves all accessible Custom Fields' — a read-only query operation with no side effects.

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

POLICY

How to control clickup_get_custom_fields

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "clickup_get_custom_fields": {}
  }
}

clickup_get_custom_fields is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register ClickUp 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

Related tools and policies

More ClickUp MCP Server tools

Destructive clickup_delete_folder Deletes a Folder. Destructive clickup_delete_space Deletes a Space. Destructive clickup_delete_view Deletes a View. Destructive clickup_remove_task_custom_field_value Removes the value of a Custom Field from a specific task. Write clickup_create_board Create a new board view in a ClickUp space. Write clickup_create_doc Creates a new Doc within a Workspace. Write clickup_create_doc_page Creates a new page within a specific Doc. Write clickup_create_folder Creates a new Folder within a Space.

All 31 ClickUp MCP Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about clickup_get_custom_fields

What does the clickup_get_custom_fields tool do? +

Retrieves all accessible Custom Fields for a given List. It is categorised as a Read tool in the ClickUp MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on clickup_get_custom_fields? +

Register the ClickUp MCP Server MCP server in PolicyLayer and add a rule for clickup_get_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 ClickUp MCP Server. Nothing to install.

What risk level is clickup_get_custom_fields? +

clickup_get_custom_fields is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit clickup_get_custom_fields? +

Yes. Add a rate_limit block to the clickup_get_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.

How do I block clickup_get_custom_fields completely? +

Set action: deny in the PolicyLayer policy for clickup_get_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.

What MCP server provides clickup_get_custom_fields? +

clickup_get_custom_fields is provided by the ClickUp MCP Server MCP server (nazruden/clickup-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 ClickUp MCP Server tool call.

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

CHECK YOUR STACK →