list_spaces

THE RISK

Low Risk

Why list_spaces needs a policy

This tool retrieves and enumerates existing spaces without modifying, creating, or deleting any data. It is a pure read operation that poses minimal risk if misused by an AI agent, as it only exposes available workspace organization information.

From the tool's definition Tool name 'list_spaces' and description 'List all available spaces in Docmost' indicate a retrieval/query operation with no side effects.

Documented attack patterns abuse exactly the kind of access list_spaces gives an agent:

POLICY

How to control list_spaces

PolicyLayer is an MCP gateway — it sits between your AI agents and Docmost MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_spaces:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_spaces": {}
  }
}

list_spaces is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Docmost MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Docmost MCP Server tools

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All 11 Docmost MCP Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_spaces

What does the list_spaces tool do? +

List all available spaces in Docmost. It is categorised as a Read tool in the Docmost MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_spaces? +

Register the Docmost MCP Server MCP server in PolicyLayer and add a rule for list_spaces: 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 Docmost MCP Server. Nothing to install.

What risk level is list_spaces? +

list_spaces is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_spaces? +

Yes. Add a rate_limit block to the list_spaces 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.

How do I block list_spaces completely? +

Set action: deny in the PolicyLayer policy for list_spaces. 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.

What MCP server provides list_spaces? +

list_spaces is provided by the Docmost MCP Server MCP server (mrmartinimo/docmost-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Docmost MCP Server tool call.

Start from Docmost MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →