create_webhook

Creates webhook that triggers collection with custom payload

SERVERPostman SOURCEdelano/postman-mcp-server

High RISK CLASS

Category Execute

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/create-webhook.md

WHAT IT DOES

What create_webhook does on Postman

AI agents invoke create_webhook to trigger actions in Postman. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why create_webhook is rated High

A webhook that 'triggers collection with custom payload' causes active execution of a Postman collection when invoked. This is more than just writing a configuration record — it establishes an externally-triggerable execution endpoint.

From the tool's definition Creates webhook that triggers collection with custom payload

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_webhook 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 create_webhook, this is the rule to start with:

create_webhook Rate-limited

create_webhook stays usable, but rate-capped: a runaway agent can't fire it dozens of times 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_webhook": {
      "limits": [
        {
          "counter": "create_webhook_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about create_webhook

What does the create_webhook tool do? +

Creates webhook that triggers collection with custom payload. It is categorised as a Execute tool in the Postman MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on create_webhook? +

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

create_webhook is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit create_webhook? +

Yes. Add a rate_limit block to the create_webhook 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_webhook completely? +

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

create_webhook 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 create_webhook does on Postman

Why create_webhook is rated High

The rule that runs create_webhook safely

Questions about create_webhook

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