tcp_close

Close an open TCP session.

SERVERJshookmcp SOURCE@jshookmcp/jshook

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-vmoranv-jshookmcp/tcp-close.md

WHAT IT DOES

What tcp_close does on Jshookmcp

AI agents invoke tcp_close to trigger actions in Jshookmcp. 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.

RISK

Why tcp_close is rated High

Terminating a TCP session triggers an external network operation with connectivity side effects.

From the tool's definition Close an open TCP session

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs tcp_close safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Jshookmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For tcp_close, this is the rule to start with:

tcp_close Rate-limited

tcp_close 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": {
    "tcp_close": {
      "limits": [
        {
          "counter": "tcp_close_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Jshookmcp, apply this rule, and every tcp_close call is checked against it from then on.

FAQ

Questions about tcp_close

What does the tcp_close tool do? +

Close an open TCP session. It is categorised as a Execute tool in the Jshookmcp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on tcp_close? +

Register the Jshook MCP server in PolicyLayer and add a rule for tcp_close: 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 Jshookmcp. Nothing to install.

What risk level is tcp_close? +

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

Can I rate-limit tcp_close? +

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

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

tcp_close is provided by the Jshook MCP server (@jshookmcp/jshook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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