wiki_group_update · Mcp Wikijs Mv MCP: Risk & Policy

WHAT IT DOES

What wiki_group_update does on Mcp Wikijs Mv

AI agents use wiki_group_update to create or update resources in Mcp Wikijs Mv — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Wikijs Mv environment.

WHY IT NEEDS A POLICY

Why wiki_group_update needs a policy

This tool modifies existing group records (permissions, pageRules, and other group attributes) in a Wiki.js system. While reversible in principle (updated data can be reverted with subsequent calls), the ability to modify access control rules (pageRules) and group permissions creates significant blast radius if misused by an AI agent—unauthorized permission escalation or access control changes could compromise the…

From the tool's definition Tool name contains 'update' and description explicitly states 'Update a group' with selective field modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

wiki_group_update Rate-limited

wiki_group_update 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "wiki_group_update": {
      "limits": [
        {
          "counter": "wiki_group_update_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mcp Wikijs Mv, so you can run agents against it safely.

FAQ

Questions about wiki_group_update

What does the wiki_group_update tool do? +

Update a group. Only the fields you pass change; permissions and pageRules you omit are preserved (read from the current group first). pageRules is the full ruleset when provided. It is categorised as a Write tool in the Mcp Wikijs Mv MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on wiki_group_update? +

Register the Mcp Wikijs Mv MCP server in PolicyLayer and add a rule for wiki_group_update: 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 Mcp Wikijs Mv. Nothing to install.

What risk level is wiki_group_update? +

wiki_group_update is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit wiki_group_update? +

Yes. Add a rate_limit block to the wiki_group_update 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 wiki_group_update completely? +

Set action: deny in the PolicyLayer policy for wiki_group_update. 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 wiki_group_update? +

wiki_group_update is provided by the Mcp Wikijs Mv MCP server (janschachtschabel/mcp-for-wiki-js). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.