Add domain to Pi-hole blacklist
AI agents use pihole-blacklist to create or update resources in Ansible — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ansible environment.
This tool creates or modifies data (Pi-hole blacklist entries) in a reversible manner. A domain can be removed from the blacklist if added incorrectly. While the action affects network traffic (blocking DNS queries for the domain), it is not destructive (no data is deleted), not financial, and not Execute-level code execution. It's a Write operation that modifies configuration state.
From the tool's definition The tool is named 'pihole-blacklist' with description 'Add domain to Pi-hole blacklist'. The verb 'Add' indicates a write operation that creates a new entry in the blacklist configuration.
Documented attack patterns abuse exactly the kind of access pihole-blacklist gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ansible, and nothing reaches the server without passing your rules. This is the rule we recommend for pihole-blacklist:
{
"version": "1",
"default": "deny",
"tools": {
"pihole-blacklist": {
"limits": [
{
"counter": "pihole-blacklist_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}pihole-blacklist 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 domain to Pi-hole blacklist. It is categorised as a Write tool in the Ansible MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Ansible MCP server in PolicyLayer and add a rule for pihole-blacklist: 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 Ansible. Nothing to install.
pihole-blacklist 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 pihole-blacklist 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 pihole-blacklist. 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.
pihole-blacklist is provided by the Ansible MCP server (washyu/ansible-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Ansible, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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90 Ansible tools catalogued and risk-classified — across an index of 43,000+ MCP servers.