AI agents use update_campaign to create or update resources in Listmonk MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Listmonk MCP Server environment.
Updating a campaign modifies existing email/newsletter campaign data, which is a Write-category operation. Severity is high because a compromised AI agent could modify campaign content, recipient lists, or scheduling to send unwanted communications, compromise user trust, or cause organizational harm—though the action remains reversible (campaigns can be edited again or reverted).
From the tool's definition Tool name is 'update_campaign' and description states it 'Update[s] an existing campaign' — modifying campaign data is a reversible write operation.
Documented attack patterns abuse exactly the kind of access update_campaign gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Listmonk MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for update_campaign:
{
"version": "1",
"default": "deny",
"tools": {
"update_campaign": {
"limits": [
{
"counter": "update_campaign_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_campaign 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 campaign. It is categorised as a Write tool in the Listmonk MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Listmonk MCP Server MCP server in PolicyLayer and add a rule for update_campaign: 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 Listmonk MCP Server. Nothing to install.
update_campaign 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_campaign 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_campaign. 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_campaign is provided by the Listmonk MCP Server MCP server (rhnvrm/listmonk-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 29 Listmonk MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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29 Listmonk MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.