Upload custom files for a form field (e.g. file upload fields in form submissions)
AI agents use upload_form_custom_files 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 and stores data (files) in the form submission system, which is a reversible write operation. While file uploads could theoretically be exploited for malware distribution or data exfiltration, the primary action is data creation within a CRM context.
From the tool's definition Tool name 'upload_form_custom_files' and description 'Upload custom files for a form field' indicate file creation/storage operations. The tool stores user-submitted files in a CRM system.
Documented attack patterns abuse exactly the kind of access upload_form_custom_files 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 upload_form_custom_files:
{
"version": "1",
"default": "deny",
"tools": {
"upload_form_custom_files": {
"limits": [
{
"counter": "upload_form_custom_files_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}upload_form_custom_files 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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Upload custom files for a form field (e.g. file upload fields in form submissions). 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 upload_form_custom_files: 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.
upload_form_custom_files 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 upload_form_custom_files 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 upload_form_custom_files. 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.
upload_form_custom_files is provided by the GoHighLevel MCP Server MCP server (busybee3333/go-high-level-mcp-2026-complete). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 566 GoHighLevel MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
566 GoHighLevel MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.