unpublish_mock · Postman MCP: Risk & Policy

WHAT IT DOES

What unpublish_mock does on Postman

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

WHY IT NEEDS A POLICY

Why unpublish_mock needs a policy

Unpublishing a mock server changes its access control from public to private, which is a reversible modification of the resource's visibility settings. It does not delete data, execute code, or involve financial transactions. The blast radius is moderate — it could disrupt consumers relying on a public mock endpoint — but the action can be reversed by re-publishing.

From the tool's definition Unpublish mock server (sets Access Control to private)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unpublish_mock Rate-limited

unpublish_mock 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": {
    "unpublish_mock": {
      "limits": [
        {
          "counter": "unpublish_mock_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 Postman, so you can run agents against it safely.

FAQ

Questions about unpublish_mock

What does the unpublish_mock tool do? +

Unpublish mock server (sets Access Control to private). It is categorised as a Write tool in the Postman MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on unpublish_mock? +

Register the Postman MCP server in PolicyLayer and add a rule for unpublish_mock: 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 Postman. Nothing to install.

What risk level is unpublish_mock? +

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

Can I rate-limit unpublish_mock? +

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

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

unpublish_mock is provided by the Postman MCP server (postmanv3/postman-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.