preview_draft

Generate a preview link for a draft post that can be shared with others for feedback. The preview link allows others to read the draft without it being published.

ServerSubstack Mcp Plus
CategoryRead

How to control preview_draft ↓

WHAT IT DOES

What preview_draft does on Substack Mcp Plus

AI agents call preview_draft to retrieve information from Substack Mcp Plus without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why preview_draft needs a policy

This tool retrieves and presents draft post content via a shareable preview link. It has no side effects on the draft itself—it neither modifies, publishes, nor deletes the post. The action is informational and reversible. While preview links could be shared broadly, the blast radius of misuse is limited to unintended disclosure of draft content, not data loss or system compromise.

From the tool's definition The tool generates a preview link for sharing draft content for feedback. It allows others to 'read the draft without it being published', which is fundamentally a read operation that retrieves and displays data without modification.

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

POLICY

How to control preview_draft

PolicyLayer is an MCP gateway — it sits between your AI agents and Substack Mcp Plus, and nothing reaches the server without passing your rules. This is the rule we recommend for preview_draft:

policy.json

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

preview_draft 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 Substack Mcp Plus — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

More Substack Mcp Plus tools

Destructive delete_draft Delete a draft post. IMPORTANT: You MUST ALWAYS ask the user to confirm deletion in a foll Execute publish_post Publish a draft post immediately to your Substack publication. This makes the post publicl Write create_formatted_post Create a new formatted draft post on Substack. Supports full markdown formatting. IMPORTAN Write duplicate_post Create a copy of an existing post as a new draft. Perfect for using posts as templates. IM Write update_post Update an existing Substack draft post. WARNING: This tool COMPLETELY REPLACES the specifi Write upload_image Upload an image file from your local computer to Substack Read get_post_content Read the full content of a specific post (draft or published) with all its formatting. Ret Read get_sections Get a list of available sections/categories in your Substack publication. Sections help or

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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 preview_draft

What does the preview_draft tool do? +

Generate a preview link for a draft post that can be shared with others for feedback. The preview link allows others to read the draft without it being published. It is categorised as a Read tool in the Substack Mcp Plus MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on preview_draft? +

Register the Substack Mcp Plus MCP server in PolicyLayer and add a rule for preview_draft: 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 Substack Mcp Plus. Nothing to install.

What risk level is preview_draft? +

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

Can I rate-limit preview_draft? +

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

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

preview_draft is provided by the Substack Mcp Plus MCP server (ty13r/substack-mcp-plus). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Substack Mcp Plus tool call.

Start from Substack Mcp Plus, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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12 Substack Mcp Plus tools catalogued and risk-classified — across an index of 43,000+ MCP servers.