Updates an existing member in Ghost CMS. All fields except id are optional.
AI agents use ghost_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.
This tool modifies existing member records in a CMS system. Updates are reversible (data can be changed again or restored), placing it in the Write category rather than Destructive. The severity is medium because member data modifications could affect user access, subscriptions, or communication preferences, with a moderate blast radius if misused by an AI agent to alter member records without authorization.
From the tool's definition Tool description states 'Updates an existing member in Ghost CMS' — an update operation that modifies data reversibly. The optional fields mechanism allows selective modification without deletion.
Documented attack patterns abuse exactly the kind of access ghost_update_member gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Ghost MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for ghost_update_member:
{
"version": "1",
"default": "deny",
"tools": {
"ghost_update_member": {
"limits": [
{
"counter": "ghost_update_member_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}ghost_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.
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Updates an existing member in Ghost CMS. All fields except id are optional. 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.
Register the Ghost MCP Server MCP server in PolicyLayer and add a rule for ghost_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.
ghost_update_member 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 ghost_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.
Set action: deny in the PolicyLayer policy for ghost_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.
ghost_update_member is provided by the Ghost MCP Server MCP server (jgardner04/ghost-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Ghost MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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39 Ghost MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.