create_post · MCP Blog Demo MCP: Risk & Policy

WHAT IT DOES

What create_post does on MCP Blog Demo

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

WHY IT NEEDS A POLICY

Why create_post needs a policy

The tool creates new blog post records, which is a reversible write operation. It modifies the blog database by adding content, but changes can be undone via deletion or updates. This is less severe than destructive operations (which cannot be easily reversed) and less critical than financial operations, but more impactful than read-only queries.

From the tool's definition Tool name is 'create_post' and description states 'Tạo bài viết blog mới' (Create new blog post). This is a create operation that adds new data to the MongoDB backend.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_post Rate-limited

create_post 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": {
    "create_post": {
      "limits": [
        {
          "counter": "create_post_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 Blog Demo, so you can run agents against it safely.

FAQ

Questions about create_post

What does the create_post tool do? +

Tạo bài viết blog mới. It is categorised as a Write tool in the MCP Blog Demo MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_post? +

Register the MCP Blog Demo MCP server in PolicyLayer and add a rule for create_post: 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 Blog Demo. Nothing to install.

What risk level is create_post? +

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

Can I rate-limit create_post? +

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

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

create_post is provided by the MCP Blog Demo MCP server (trungls1706/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.