Add a lead or domain to the global blocklist to prevent future contact.
AI agents use smartlead_add_lead_to_global_blocklist to create or update resources in SmartLead MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your SmartLead MCP Server environment.
This tool modifies system state by writing/adding records to a blocklist. While it prevents future contact, it does not delete data irreversibly, nor does it destroy campaign data or execute arbitrary code. The severity is medium because misuse could block legitimate leads/domains from being contacted, disrupting marketing operations, but the blocklist itself can typically be modified or entries removed.
From the tool's definition Tool name explicitly states 'add' and description says 'Add a lead or domain to the global blocklist' — this creates/modifies blocklist data by adding entries. The action is reversible (entries can be removed from a blocklist).
Documented attack patterns abuse exactly the kind of access smartlead_add_lead_to_global_blocklist gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SmartLead MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for smartlead_add_lead_to_global_blocklist:
{
"version": "1",
"default": "deny",
"tools": {
"smartlead_add_lead_to_global_blocklist": {
"limits": [
{
"counter": "smartlead_add_lead_to_global_blocklist_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}smartlead_add_lead_to_global_blocklist 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 a lead or domain to the global blocklist to prevent future contact. It is categorised as a Write tool in the SmartLead MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the SmartLead MCP Server MCP server in PolicyLayer and add a rule for smartlead_add_lead_to_global_blocklist: 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 SmartLead MCP Server. Nothing to install.
smartlead_add_lead_to_global_blocklist 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 smartlead_add_lead_to_global_blocklist 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 smartlead_add_lead_to_global_blocklist. 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.
smartlead_add_lead_to_global_blocklist is provided by the SmartLead MCP Server MCP server (win8428/smartlead-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from SmartLead MCP Server, 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.
116 SmartLead MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.