AI agents use wikijs_create_space to create or update resources in Wiki Js — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Wiki Js environment.
This tool creates a new space (a container/organizational unit in Wiki.js), which is a reversible write operation. It does not execute arbitrary code, delete data, or move money. The severity is medium because creating spaces could be misused to fragment documentation or create unauthorized organizational structures, but the impact is limited to data creation rather than destruction or code execution.
From the tool's definition Tool name is 'wikijs_create_space' and description states 'Create a new space in Wiki.js.' The verb 'Create' indicates a write operation that generates new organizational structure.
Documented attack patterns abuse exactly the kind of access wikijs_create_space 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_create_space:
{
"version": "1",
"default": "deny",
"tools": {
"wikijs_create_space": {
"limits": [
{
"counter": "wikijs_create_space_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}wikijs_create_space 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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Create a new space in Wiki.js. It is categorised as a Write tool in the Wiki Js MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Wiki Js MCP server in PolicyLayer and add a rule for wikijs_create_space: 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_create_space 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 wikijs_create_space 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_create_space. 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_create_space 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.