Retrieve all available document types for categorizing documents by purpose or format (Invoice, Receipt, Contract, etc.). Returns names and automatic matching rules.
AI agents call list_document_types to retrieve information from Paperless-NGX MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates existing document type metadata. It performs no modifications, deletions, or external operations. The worst-case misuse is information disclosure about the document taxonomy, which has minimal blast radius. This is a straightforward Read operation.
From the tool's definition Tool name 'list_document_types' and description 'Retrieve all available document types' indicates a retrieval operation with no side effects. The phrase 'Returns names and automatic matching rules' confirms it is a query-only action.
Documented attack patterns abuse exactly the kind of access list_document_types gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Paperless-NGX MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_document_types:
{
"version": "1",
"default": "deny",
"tools": {
"list_document_types": {}
}
}list_document_types is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieve all available document types for categorizing documents by purpose or format (Invoice, Receipt, Contract, etc.). Returns names and automatic matching rules. It is categorised as a Read tool in the Paperless-NGX MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Paperless-NGX MCP Server MCP server in PolicyLayer and add a rule for list_document_types: 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 Paperless-NGX MCP Server. Nothing to install.
list_document_types is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_document_types 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 list_document_types. 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.
list_document_types is provided by the Paperless-NGX MCP Server MCP server (nloui/paperless-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 16 Paperless-NGX MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
16 Paperless-NGX MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.