Create a new address book
Part of the Nextcloud MCP Server server.
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AI agents use nextcloud_contacts_create_addressbook to create or modify resources in Nextcloud MCP Server. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call nextcloud_contacts_create_addressbook repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Nextcloud MCP Server.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"nextcloud_contacts_create_addressbook": {
"limits": [
{
"counter": "nextcloud_contacts_create_addressbook_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Nextcloud MCP Server policy for all 30 tools.
These attack patterns abuse exactly the kind of access nextcloud_contacts_create_addressbook gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Create a new address book. It is categorised as a Write tool in the Nextcloud MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Nextcloud MCP Server MCP server in PolicyLayer and add a rule for nextcloud_contacts_create_addressbook: 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 Nextcloud MCP Server. Nothing to install.
nextcloud_contacts_create_addressbook 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 nextcloud_contacts_create_addressbook 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 nextcloud_contacts_create_addressbook. 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.
nextcloud_contacts_create_addressbook is provided by the Nextcloud MCP Server MCP server (hithereiamaliff/mcp-nextcloud). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 30 Nextcloud MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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