update_purchase_order · Sanka MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_purchase_order does on Sanka MCP Server

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

WHY IT NEEDS A POLICY

Why update_purchase_order needs a policy

This tool modifies existing purchase order records reversibly (updates, not deletes). While purchase orders relate to procurement and have financial implications, the tool itself performs Write operations rather than moving money directly (which would be Financial category).

From the tool's definition Tool name is 'update_purchase_order' and description states 'Update an existing purchase order in Sanka.' The verb 'update' indicates modification of existing data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_purchase_order Rate-limited

update_purchase_order 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": {
    "update_purchase_order": {
      "limits": [
        {
          "counter": "update_purchase_order_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 Sanka MCP Server, so you can run agents against it safely.

FAQ

Questions about update_purchase_order

What does the update_purchase_order tool do? +

Update an existing purchase order in Sanka. Attach uploaded file ids with. It is categorised as a Write tool in the Sanka 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 update_purchase_order? +

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

What risk level is update_purchase_order? +

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

Can I rate-limit update_purchase_order? +

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

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

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