Get custom fields configured for a list
AI agents call get_accessible_custom_fields to retrieve information from ClickUp 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 associated with a list in ClickUp. It performs a read-only operation that retrieves existing configuration data without creating, modifying, deleting, or executing any actions. The blast radius of misuse is minimal—an attacker could only discover what custom fields exist, not modify them or access sensitive data beyond field names and types.
From the tool's definition Tool name 'get_accessible_custom_fields' and description 'Get custom fields configured for a list' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
Get custom fields configured for a list. It is categorised as a Read tool in the ClickUp MCP Server MCP Server, which means it retrieves data without modifying state.
Register the ClickUp MCP Server MCP server in PolicyLayer and add a rule for get_accessible_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.
get_accessible_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 get_accessible_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 get_accessible_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.
get_accessible_custom_fields is provided by the ClickUp MCP Server MCP server (smeric28/clickup-mcp). 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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