create_vendor · FacturaHub MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_vendor does on FacturaHub MCP Server

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

WHY IT NEEDS A POLICY

Why create_vendor needs a policy

This tool creates new records in the vendor/supplier database, which is a reversible write operation. While it doesn't read, execute external code, delete data, or move money, it does add business entities that become integrated into the financial tracking system (linked to expenses).

From the tool's definition Tool description states 'Create a new vendor/supplier' which explicitly indicates data creation. Vendors are persistent business entities linked to the expense tracking system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_vendor Rate-limited

create_vendor 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_vendor": {
      "limits": [
        {
          "counter": "create_vendor_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 FacturaHub MCP Server, so you can run agents against it safely.

FAQ

Questions about create_vendor

What does the create_vendor tool do? +

[FacturaHub] Create a new vendor/supplier. Vendors are linked to expenses for tracking who you pay. It is categorised as a Write tool in the FacturaHub 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_vendor? +

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

What risk level is create_vendor? +

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

Can I rate-limit create_vendor? +

Yes. Add a rate_limit block to the create_vendor 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_vendor completely? +

Set action: deny in the PolicyLayer policy for create_vendor. 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_vendor? +

create_vendor is provided by the FacturaHub MCP Server MCP server (santy1422/facturahub-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.