AI agents use wikijs_update_page 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 modifies content reversibly by updating pages in a wiki system. While it changes data, the action is not destructive (pages are not deleted) and can be undone through subsequent updates or version control.
From the tool's definition Tool name 'wikijs_update_page' and description 'Update an existing page in Wiki.js' indicate modification of existing data.
Documented attack patterns abuse exactly the kind of access wikijs_update_page 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_update_page:
{
"version": "1",
"default": "deny",
"tools": {
"wikijs_update_page": {
"limits": [
{
"counter": "wikijs_update_page_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}wikijs_update_page 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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Update an existing page 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_update_page: 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_update_page 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_update_page 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_update_page. 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_update_page 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.