disconnect · Ib Async MCP: Risk & Policy

WHAT IT DOES

What disconnect does on Ib Async

AI agents invoke disconnect to trigger actions in Ib Async. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why disconnect needs a policy

Disconnecting from the TWS/Gateway terminates the active connection to the trading platform, which is an external operation with real consequences (halting all market data feeds, order monitoring, and trading capabilities). It is not a simple read, write, or deletion of data, but an execution of an external operation.

From the tool's definition Disconnect from TWS/Gateway

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

disconnect Rate-limited

disconnect stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "disconnect": {
      "limits": [
        {
          "counter": "disconnect_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about disconnect

What does the disconnect tool do? +

Disconnect from TWS/Gateway. It is categorised as a Execute tool in the Ib Async MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on disconnect? +

Register the Ib Async MCP server in PolicyLayer and add a rule for disconnect: 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 Ib Async. Nothing to install.

What risk level is disconnect? +

disconnect is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit disconnect? +

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

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

disconnect is provided by the Ib Async MCP server (nadavgb-atom/ib-async-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.