siigo_create_purchase · Siigo MCP Server MCP: Risk & Policy

WHAT IT DOES

What siigo_create_purchase does on Siigo MCP Server

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

WHY IT NEEDS A POLICY

Why siigo_create_purchase needs a policy

This tool creates new purchase invoices (compras) in Siigo, an accounting software system. This is a reversible write operation that modifies the financial record system by adding new transaction records. Although it involves accounting/financial data, the action itself is document creation (Write category), not movement of money (Financial category).

From the tool's definition The tool 'siigo_create_purchase' with description 'Create a new purchase invoice' and 'creates a Documento Soporte' explicitly performs creation of financial documents in an accounting system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

siigo_create_purchase Rate-limited

siigo_create_purchase 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": {
    "siigo_create_purchase": {
      "limits": [
        {
          "counter": "siigo_create_purchase_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Siigo MCP Server, so you can run agents against it safely.

FAQ

Questions about siigo_create_purchase

What does the siigo_create_purchase tool do? +

Create a new purchase invoice (factura de compra). Use document type FC. If the document type has document_support=true, it creates a Documento Soporte. It is categorised as a Write tool in the Siigo 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 siigo_create_purchase? +

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

What risk level is siigo_create_purchase? +

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

Can I rate-limit siigo_create_purchase? +

Yes. Add a rate_limit block to the siigo_create_purchase 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 siigo_create_purchase completely? +

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

siigo_create_purchase is provided by the Siigo MCP Server MCP server (jdlar1/siigo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.