apply_client_fee

THE RISK

Critical Risk

Why apply_client_fee needs a policy

This tool applies a financial charge to a client's profile, which represents a financial obligation or transaction against the client's account. This directly commits financial obligations, placing it in the Financial category. Misuse could result in unauthorized or incorrect charges being applied to client banking profiles.

From the tool's definition Apply a one-time fee/charge to a client profile

Documented attack patterns abuse exactly the kind of access apply_client_fee gives an agent:

POLICY

How to control apply_client_fee

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Mifosx, and nothing reaches the server without passing your rules. This is the rule we recommend for apply_client_fee:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "apply_client_fee": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to apply_client_fee is blocked until a human approves it. The rest of the server keeps working.

Create a free account and register Mcp Mifosx — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Mcp Mifosx tools

Financial create_new_charge Create a new charge definition. Financial deposit Deposit money into a savings account. Validates accountId exists before executing. Financial withdraw Withdraw money from a savings account. Validates accountId and balance before executing. Financial make_repayment Make a repayment on an active loan. Validates loanId and status before executing. Financial record_journal_entry Record a manual journal entry. Date format: 'dd MMMM yyyy' e.g. '10 March 2026' Financial undo_disbursal Undo a loan disbursal to reverse funds and return the loan to approved status. Financial waive_loan_interest Waive interest on a loan. Validates loanId exists before executing. Financial apply_loan_fee Apply a fee/charge to a loan. Validates loanId exists before executing.

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Go deeper

Critical-risk tools in Mcp Mifosx → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about apply_client_fee

What does the apply_client_fee tool do? +

Apply a one-time fee/charge to a client profile. It is categorised as a Financial tool in the Mcp Mifosx MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on apply_client_fee? +

Register the Mcp Mifosx MCP server in PolicyLayer and add a rule for apply_client_fee: 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 Mifosx. Nothing to install.

What risk level is apply_client_fee? +

apply_client_fee is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit apply_client_fee? +

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

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

apply_client_fee is provided by the Mcp Mifosx MCP server (openmf/mcp-mifosx). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Mifosx tool call.

Start from Mcp Mifosx, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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