AI agents call wikijs_list_spaces to retrieve information from Wiki Js without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only query operation that retrieves information about Wiki.js spaces. It has no side effects, does not modify data, and does not execute code or trigger external operations. The blast radius of misuse is minimal—an attacker could enumerate the structure of the wiki but cannot create, modify, or delete content.
From the tool's definition Tool name and description: 'List all spaces (top-level Wiki.js containers)' — retrieves and lists existing containers without modification or side effects.
Documented attack patterns abuse exactly the kind of access wikijs_list_spaces gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Wiki Js, and nothing reaches the server without passing your rules. This is the rule we recommend for wikijs_list_spaces:
{
"version": "1",
"default": "deny",
"tools": {
"wikijs_list_spaces": {}
}
}wikijs_list_spaces is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all spaces (top-level Wiki.js containers). It is categorised as a Read tool in the Wiki Js MCP Server, which means it retrieves data without modifying state.
Register the Wiki Js MCP server in PolicyLayer and add a rule for wikijs_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 Wiki Js. Nothing to install.
wikijs_list_spaces 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 wikijs_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.
Set action: deny in the PolicyLayer policy for wikijs_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.
wikijs_list_spaces is provided by the Wiki Js MCP server (talosdeus/wiki-js-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 21 Wiki Js tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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21 Wiki Js tools catalogued and risk-classified — across an index of 42,500+ MCP servers.