Update an existing custom field
AI agents use update_location_custom_field to create or update resources in GoHighLevel MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your GoHighLevel MCP Server environment.
This tool creates or modifies data reversibly through a CRM update operation. It does not delete data (thus not Destructive), does not execute arbitrary code (thus not Execute), does not move money (thus not Financial), and performs modification rather than mere retrieval (thus not Read).
From the tool's definition Tool name 'update_location_custom_field' and description 'Update an existing custom field' indicate modification of data. The action is reversible (custom fields can be updated again or reset), and it modifies records within the GoHighLevel CRM system.
Documented attack patterns abuse exactly the kind of access update_location_custom_field gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and GoHighLevel MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for update_location_custom_field:
{
"version": "1",
"default": "deny",
"tools": {
"update_location_custom_field": {
"limits": [
{
"counter": "update_location_custom_field_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_location_custom_field 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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Update an existing custom field. It is categorised as a Write tool in the GoHighLevel MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the GoHighLevel MCP Server MCP server in PolicyLayer and add a rule for update_location_custom_field: 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 GoHighLevel MCP Server. Nothing to install.
update_location_custom_field 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 update_location_custom_field 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 update_location_custom_field. 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.
update_location_custom_field is provided by the GoHighLevel MCP Server MCP server (mastanley13/gohighlevel-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 255 GoHighLevel MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
255 GoHighLevel MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.