replace_order · Schwab MCP: Risk & Policy

WHAT IT DOES

What replace_order does on Schwab

AI agents use replace_order to commit financial operations through Schwab — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why replace_order needs a policy

In brokerage systems, 'replace_order' (also known as order amendment or modification) modifies an existing financial order — changing price, quantity, or order type. This directly affects financial transactions.

From the tool's definition Tool name 'replace_order' on a server described as connecting to 'Charles Schwab brokerage API' with 'secure order execution' capabilities, alongside sibling tools like 'cancel_order' and 'get_order' confirming a trading/brokerage context.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

replace_order Approval-gated

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

View as policy code

policy.json

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

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

FAQ

Questions about replace_order

What does the replace_order tool do? +

replace_order. It is categorised as a Financial tool in the Schwab MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on replace_order? +

Register the Schwab MCP server in PolicyLayer and add a rule for replace_order: 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 Schwab. Nothing to install.

What risk level is replace_order? +

replace_order 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 replace_order? +

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

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

replace_order is provided by the Schwab MCP server (k1xme/schwab-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.