update_mock

Update an existing mock server

SERVERPostman SOURCEdelano/postman-mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/delano-postman-mcp-server/update-mock.md

WHAT IT DOES

What update_mock does on Postman

AI agents use update_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.

RISK

Why update_mock is rated Medium

This tool modifies an existing mock server configuration reversibly. Updates are Write-category actions—they change state but remain reversible (can be modified again or undone). The blast radius is medium because misconfiguration of a mock server could disrupt API testing workflows or expose test data, but it does not permanently delete resources or execute arbitrary code.

From the tool's definition Tool name is 'update_mock' and description states it will 'Update an existing mock server', indicating modification of an existing resource.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs update_mock safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Postman, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For update_mock, this is the rule to start with:

update_mock Rate-limited

update_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": {
    "update_mock": {
      "limits": [
        {
          "counter": "update_mock_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Postman, apply this rule, and every update_mock call is checked against it from then on.

FAQ

Questions about update_mock

What does the update_mock tool do? +

Update an existing mock server. 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 update_mock? +

Register the Postman MCP server in PolicyLayer and add a rule for update_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 update_mock? +

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

Can I rate-limit update_mock? +

Yes. Add a rate_limit block to the update_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 update_mock completely? +

Set action: deny in the PolicyLayer policy for update_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 update_mock? +

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

KEEP EXPLORING

What update_mock does on Postman

Why update_mock is rated Medium

The rule that runs update_mock safely

Questions about update_mock

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