generate_trial_balance · Excel Finance MCP: Risk & Policy

WHAT IT DOES

What generate_trial_balance does on Excel Finance MCP

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

WHY IT NEEDS A POLICY

Why generate_trial_balance needs a policy

The trial balance is a financial report that will be created and stored, modifying the Excel workbook state. This is reversible (can be regenerated or deleted), so it falls under Write rather than Destructive. While it operates on financial data, it does not directly move money or commit financial obligations, so it is not Financial.

From the tool's definition Tool name 'generate_trial_balance' combined with server description stating 'creates Excel workbooks with advanced financial formulas' and 'automated financial reporting' indicates the tool generates and creates financial documents/data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_trial_balance Rate-limited

generate_trial_balance 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": {
    "generate_trial_balance": {
      "limits": [
        {
          "counter": "generate_trial_balance_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 Excel Finance MCP, so you can run agents against it safely.

FAQ

Questions about generate_trial_balance

What does the generate_trial_balance tool do? +

Generate Trial Balance as of specified date. It is categorised as a Write tool in the Excel Finance MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on generate_trial_balance? +

Register the Excel Finance MCP server in PolicyLayer and add a rule for generate_trial_balance: 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 Excel Finance MCP. Nothing to install.

What risk level is generate_trial_balance? +

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

Can I rate-limit generate_trial_balance? +

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

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

generate_trial_balance is provided by the Excel Finance MCP server (jeremycharlesgillespie/excel-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.