depreciation_macrs · Excel Finance MCP: Risk & Policy

WHAT IT DOES

What depreciation_macrs does on Excel Finance MCP

AI agents use depreciation_macrs 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 depreciation_macrs needs a policy

MACRS depreciation schedules are computed outputs that modify financial records and tax documents, constituting a Write operation (creates new derived data). Not Destructive because schedules are reversible and don't delete data. Not Financial because it calculates tax depreciation rather than moving money or committing obligations.

From the tool's definition Tool creates a 'depreciation schedule' via calculation, modifying financial data in Excel workbooks. The server description explicitly mentions 'creating Excel workbooks with advanced financial formulas' and 'tax calculations,' and sibling tools include…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

depreciation_macrs Rate-limited

depreciation_macrs 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": {
    "depreciation_macrs": {
      "limits": [
        {
          "counter": "depreciation_macrs_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 depreciation_macrs

What does the depreciation_macrs tool do? +

Calculate MACRS depreciation schedule. 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 depreciation_macrs? +

Register the Excel Finance MCP server in PolicyLayer and add a rule for depreciation_macrs: 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 depreciation_macrs? +

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

Can I rate-limit depreciation_macrs? +

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

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

depreciation_macrs 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.