ghost_get_newsletter

THE RISK

Low Risk

Why ghost_get_newsletter needs a policy

This tool performs a simple data retrieval operation. It queries and returns newsletter information without modifying, deleting, or executing any operations. The blast radius of misuse is minimal—an AI agent could only access newsletter data it is authorized to read.

From the tool's definition Tool name contains 'get' and description states 'Retrieves a single newsletter from Ghost CMS by ID' — a query operation with no side effects.

Documented attack patterns abuse exactly the kind of access ghost_get_newsletter gives an agent:

POLICY

How to control ghost_get_newsletter

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_get_newsletter:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ghost_get_newsletter": {}
  }
}

ghost_get_newsletter is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Ghost MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Ghost MCP Server tools

Destructive ghost_delete_member Deletes a member from Ghost CMS by ID. This operation is permanent and cannot be undone. Destructive ghost_delete_newsletter Deletes a newsletter from Ghost CMS by ID. This operation is permanent and cannot be undon Destructive ghost_delete_page Deletes a page from Ghost CMS by ID. This operation is permanent and cannot be undone. Destructive ghost_delete_post Deletes a post from Ghost CMS by ID. This operation is permanent and cannot be undone. Destructive ghost_delete_tag Deletes a tag from Ghost CMS by ID. This operation is permanent and cannot be undone. Destructive ghost_delete_tier Deletes a tier (membership level) from Ghost CMS by ID. This operation is permanent and ca Execute ghost_batch_operations Execute multiple Ghost operations in a single request Execute ghost_cache_management Manage resource cache

All 39 Ghost MCP Server tools →

Read tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about ghost_get_newsletter

What does the ghost_get_newsletter tool do? +

Retrieves a single newsletter from Ghost CMS by ID. It is categorised as a Read tool in the Ghost MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on ghost_get_newsletter? +

Register the Ghost MCP Server MCP server in PolicyLayer and add a rule for ghost_get_newsletter: 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 ghost_get_newsletter? +

ghost_get_newsletter is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit ghost_get_newsletter? +

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

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

ghost_get_newsletter 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.

Enforce policy on every Ghost MCP Server tool call.

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.

CHECK YOUR STACK →