create_api_version · Postman MCP: Risk & Policy

WHAT IT DOES

What create_api_version does on Postman

AI agents use create_api_version 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 create_api_version needs a policy

This tool creates a new API version, which is a write operation that creates data reversibly within Postman's API management system. It does not execute arbitrary code, delete data irreversibly, or move money. The blast radius is medium because creating unintended API versions could clutter the workspace and potentially cause version management confusion, but effects are reversible through deletion.

From the tool's definition Tool is named 'create_api_version' and description states 'Create a new version of an API', indicating it creates/adds new versioned resources in Postman's API management system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_api_version Rate-limited

create_api_version 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_api_version": {
      "limits": [
        {
          "counter": "create_api_version_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 create_api_version

What does the create_api_version tool do? +

Create a new version of an API. 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 create_api_version? +

Register the Postman MCP server in PolicyLayer and add a rule for create_api_version: 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 create_api_version? +

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

Can I rate-limit create_api_version? +

Yes. Add a rate_limit block to the create_api_version 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_api_version completely? +

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

create_api_version 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.