create_bin · RequestBin MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_bin does on RequestBin MCP Server

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

WHY IT NEEDS A POLICY

Why create_bin needs a policy

This tool creates a new webhook bin resource, which is a write operation that creates data. It does not retrieve/query existing data (Read), execute arbitrary code or commands (Execute), delete/overwrite data irreversibly (Destructive), or involve financial transactions (Financial).

From the tool's definition Tool description states 'Create a new webhook bin' - the word 'Create' indicates data creation. The operation creates a new webhook bin resource and returns a URL, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_bin Rate-limited

create_bin 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_bin": {
      "limits": [
        {
          "counter": "create_bin_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 RequestBin MCP Server, so you can run agents against it safely.

FAQ

Questions about create_bin

What does the create_bin tool do? +

Create a new webhook bin to capture HTTP requests. Returns the bin URL you can use as a webhook endpoint. It is categorised as a Write tool in the RequestBin MCP Server 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_bin? +

Register the RequestBin MCP Server MCP server in PolicyLayer and add a rule for create_bin: 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 RequestBin MCP Server. Nothing to install.

What risk level is create_bin? +

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

Can I rate-limit create_bin? +

Yes. Add a rate_limit block to the create_bin 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_bin completely? +

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

create_bin is provided by the RequestBin MCP Server MCP server (requestbin/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.