update_invoice

Update an existing invoice in Sanka, including invoice-level custom_fields such as 担当者メールアドレス. Attach uploaded file ids with

SERVERSanka MCP Server SOURCEsankahq/sanka-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/sankahq-sanka-mcp/update-invoice.md

WHAT IT DOES

What update_invoice does on Sanka MCP Server

AI agents use update_invoice 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.

RISK

Why update_invoice is rated Medium

This tool modifies invoice records, which are reversible write operations. While invoices are financial documents, the tool itself performs data updates rather than moving money or creating financial obligations (which would be Financial category).

From the tool's definition Tool name is "update_invoice" and description states "Update an existing invoice in Sanka". The word "Update" directly indicates modification of existing data.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs update_invoice safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Sanka MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For update_invoice, this is the rule to start with:

update_invoice Rate-limited

update_invoice 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_invoice": {
      "limits": [
        {
          "counter": "update_invoice_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Sanka MCP Server, apply this rule, and every update_invoice call is checked against it from then on.

FAQ

Questions about update_invoice

What does the update_invoice tool do? +

Update an existing invoice in Sanka, including invoice-level custom_fields such as 担当者メールアドレス. 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_invoice? +

Register the Sanka MCP Server MCP server in PolicyLayer and add a rule for update_invoice: 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_invoice? +

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

Can I rate-limit update_invoice? +

Yes. Add a rate_limit block to the update_invoice 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_invoice completely? +

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

update_invoice 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.

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