update_member · Ghost MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_member does on Ghost MCP Server

AI agents use update_member to create or update resources in Ghost MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ghost MCP Server environment.

WHY IT NEEDS A POLICY

Why update_member needs a policy

The tool modifies member data reversibly without permanent deletion or code execution. While it can change member attributes (email, name, status, etc.), these changes can be undone through subsequent updates. The severity is medium because unauthorized member updates could affect user accounts and access control in the CMS, but the impact is limited to a single member record and is non-destructive.

From the tool's definition Tool name 'update_member' and description 'メンバーを更新' (update member) indicate modification of member data in Ghost CMS.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_member Rate-limited

update_member 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": {
    "update_member": {
      "limits": [
        {
          "counter": "update_member_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 Ghost MCP Server, so you can run agents against it safely.

FAQ

Questions about update_member

What does the update_member tool do? +

メンバーを更新. It is categorised as a Write tool in the Ghost MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_member? +

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

What risk level is update_member? +

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

Can I rate-limit update_member? +

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

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

update_member is provided by the Ghost MCP Server MCP server (mtane0412/ghost-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.