AI agents use add_contacts_to_list to create or update resources in Frontapp MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Frontapp MCP Server environment.
This tool creates or modifies contact list membership, which is a reversible write operation. It does not retrieve data (Read), execute arbitrary code (Execute), irreversibly delete data (Destructive), or move money (Financial).
From the tool's definition Tool name 'add_contacts_to_list' and description 'Add contacts to a contact list' indicate a modification operation that adds contacts to an existing list. This is a create/modify action affecting contact organization data.
Documented attack patterns abuse exactly the kind of access add_contacts_to_list gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Frontapp MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for add_contacts_to_list:
{
"version": "1",
"default": "deny",
"tools": {
"add_contacts_to_list": {
"limits": [
{
"counter": "add_contacts_to_list_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add_contacts_to_list 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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Add contacts to a contact list. It is categorised as a Write tool in the Frontapp MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Frontapp MCP Server MCP server in PolicyLayer and add a rule for add_contacts_to_list: 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 Frontapp MCP Server. Nothing to install.
add_contacts_to_list 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 add_contacts_to_list 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 add_contacts_to_list. 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.
add_contacts_to_list is provided by the Frontapp MCP Server MCP server (zqushair/frontapp-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Frontapp MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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151 Frontapp MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.