close

Cierra el browser. Útil para liberar memoria entre runs largos.

SERVER4bis Relay Showcase SOURCEFourBis/4bis.relay-showcase

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/4bis-relay-showcase/close.md

WHAT IT DOES

What close does on 4bis Relay Showcase

AI agents invoke close to trigger actions in 4bis Relay Showcase. 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 close is rated High

Closes the browser process, triggering an external operation that terminates a running resource.

From the tool's definition Cierra el browser. Útil para liberar memoria

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs close safely

PolicyLayer is an MCP gateway: it sits between your AI agents and 4bis Relay Showcase, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For close, this is the rule to start with:

close Rate-limited

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": {
    "close": {
      "limits": [
        {
          "counter": "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 4bis Relay Showcase, apply this rule, and every close call is checked against it from then on.

FAQ

Questions about close

What does the close tool do? +

Cierra el browser. Útil para liberar memoria entre runs largos. It is categorised as a Execute tool in the 4bis Relay Showcase MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on close? +

Register the 4bis Relay Showcase MCP server in PolicyLayer and add a rule for 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 4bis Relay Showcase. Nothing to install.

What risk level is close? +

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

Can I rate-limit close? +

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

Set action: deny in the PolicyLayer policy for 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 close? +

close is provided by the 4bis Relay Showcase MCP server (FourBis/4bis.relay-showcase). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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Guides

Govern code and CI agents →Agent sandbox →Least privilege for MCP →