expense.capture · Mcp Finance MCP: Risk & Policy

WHAT IT DOES

What expense.capture does on Mcp Finance

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

WHY IT NEEDS A POLICY

Why expense.capture needs a policy

The tool creates a draft expense record (write operation), which is reversible since it is only a draft pending confirmation. It does not move money or commit financial obligations directly — it captures data for later confirmation. Severity is medium because it writes financial data to the system, but it cannot finalize transactions on its own.

From the tool's definition Crea un borrador de gasto

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

expense.capture Rate-limited

expense.capture 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": {
    "expense.capture": {
      "limits": [
        {
          "counter": "expense.capture_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about expense.capture

What does the expense.capture tool do? +

Crea un borrador de gasto y devuelve preguntas faltantes para poder confirmarlo. It is categorised as a Write tool in the Mcp Finance MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on expense.capture? +

Register the Mcp Finance MCP server in PolicyLayer and add a rule for expense.capture: 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 Mcp Finance. Nothing to install.

What risk level is expense.capture? +

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

Can I rate-limit expense.capture? +

Yes. Add a rate_limit block to the expense.capture 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 expense.capture completely? +

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

expense.capture is provided by the Mcp Finance MCP server (toothlesstarantula/mcp-finance). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.