create_source · CustomGPT MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_source does on CustomGPT MCP Server

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

WHY IT NEEDS A POLICY

Why create_source needs a policy

This tool creates new data (a source) within the system, which is a reversible write operation. It does not delete data (thus not Destructive), does not execute arbitrary code or commands (thus not Execute), and does not involve financial transactions (thus not Financial).

From the tool's definition Tool name is 'create_source' and description states 'Create a new source for an agent.' The verb 'Create' and action of adding a new source indicates data creation and modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_source Rate-limited

create_source 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_source": {
      "limits": [
        {
          "counter": "create_source_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 CustomGPT MCP Server, so you can run agents against it safely.

FAQ

Questions about create_source

What does the create_source tool do? +

Create a new source for an agent. It is categorised as a Write tool in the CustomGPT 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_source? +

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

What risk level is create_source? +

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

Can I rate-limit create_source? +

Yes. Add a rate_limit block to the create_source 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_source completely? +

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

create_source is provided by the CustomGPT MCP Server MCP server (poll-the-people/customgpt-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.