guest_leave

SERVERYaver SOURCEyaver-cli

Medium RISK CLASS

Category Write

Parameters 20 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-kivanccakmak-yaver/guest-leave.md

WHAT IT DOES

What guest_leave does on Yaver

AI agents use guest_leave to create or update resources in Yaver, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Yaver environment.

Parameter	Type	Required	Description
`hostEmail`	string	—	Email address of the host whose shared machines you want to stop using. Provide either hostUserId or hostEmail.
`hostUserId`	string	—	Public Yaver user id of the host whose shared machines you want to stop using. Provide either hostUserId or hostEmail.

Parameters from the server's own tool schema.

RISK

Why guest_leave is rated Medium

This tool modifies access/permission state by removing the agent's guest access to a host's machines. It is explicitly described as reversible, so it does not qualify as Destructive. It is a Write operation (modifying an access relationship), not merely a Read. Misuse could disrupt ongoing work by severing infrastructure access, hence medium severity.

From the tool's definition Remove YOUR OWN access to SOMEONE ELSE'S machines... walks you out of a host's shared infra... Reversible — the host can share again and you can accept again with guest_accept.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs guest_leave safely

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

guest_leave Rate-limited

guest_leave stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "guest_leave": {
      "limits": [
        {
          "counter": "guest_leave_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about guest_leave

What does the guest_leave tool do? +

Remove YOUR OWN access to SOMEONE ELSE'S machines. You are the guest here: this walks you out of a host's shared infra, so you can no longer use their machines. It does not touch your own machines and does not remove anyone else. Reversible — the host can share again and you can accept again with guest_accept. Do NOT use this to kick a guest off your own machines — that is guest_revoke. Identify the host by their Yaver user id or their email; at least one is required. It is categorised as a Write tool in the Yaver MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does guest_leave accept? +

guest_leave accepts 2 parameters: hostEmail, hostUserId. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on guest_leave? +

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

What risk level is guest_leave? +

guest_leave is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit guest_leave? +

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

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

guest_leave is provided by the Yaver MCP server (yaver-cli). 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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The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →