Set a value for a custom field on a task
AI agents use clickup_set_custom_field_value to create or update resources in ClickUp MCP Integration — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your ClickUp MCP Integration environment.
This tool modifies existing task metadata by updating a custom field value. This is a Write operation because it changes data in a reversible manner (the field value can be changed again). It does not delete data (Destructive), execute arbitrary code (Execute), or involve financial transactions (Financial). While it modifies data, the change is non-destructive and can be undone by setting a different value.
From the tool's definition Tool name 'clickup_set_custom_field_value' and description 'Set a value for a custom field on a task' indicate modification of task data. The verb 'set' combined with the action of assigning a value to a field represents data modification.
Documented attack patterns abuse exactly the kind of access clickup_set_custom_field_value gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and ClickUp MCP Integration, and nothing reaches the server without passing your rules. This is the rule we recommend for clickup_set_custom_field_value:
{
"version": "1",
"default": "deny",
"tools": {
"clickup_set_custom_field_value": {
"limits": [
{
"counter": "clickup_set_custom_field_value_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}clickup_set_custom_field_value 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.
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Set a value for a custom field on a task. It is categorised as a Write tool in the ClickUp MCP Integration MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the ClickUp MCP Integration MCP server in PolicyLayer and add a rule for clickup_set_custom_field_value: 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 Integration. Nothing to install.
clickup_set_custom_field_value is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the clickup_set_custom_field_value 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 clickup_set_custom_field_value. 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.
clickup_set_custom_field_value is provided by the ClickUp MCP Integration MCP server (leanware-io/clickup-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from ClickUp MCP Integration, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
20 ClickUp MCP Integration tools catalogued and risk-classified — across an index of 43,000+ MCP servers.