list_managed_instances

SERVERMcp SOURCEhttps://compute.googleapis.com/mcp

Low RISK CLASS

Category Read

Parameters 53 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/com-googleapis-compute-mcp/list-managed-instances.md

WHAT IT DOES

What list_managed_instances does on Mcp

AI agents call list_managed_instances to retrieve information from Mcp without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`name`	string	Yes	Required. Identifier. The instance group manager name.
`zone`	string	Yes	Required. The zone of the instance group manager.
`project`	string	Yes	Required. Project ID for this request.
`pageSize`	integer	—	Optional. The maximum number of managed instances to return.
`pageToken`	string	—	Optional. A page token received from a previous call to list managed instances.

Parameters from the server's own tool schema.

RISK

Why list_managed_instances is rated Low

This tool retrieves and queries infrastructure metadata about managed instances within a specified managed instance group. It has no side effects, does not modify or delete any resources, and does not execute arbitrary code or commands. It is a pure data retrieval operation that returns existing instance information.

From the tool's definition Tool name is 'list_managed_instances' and description states it 'Lists managed instances' with details returned including id, instance URL, status, and action.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_managed_instances safely

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

list_managed_instances Allowed

list_managed_instances is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_managed_instances": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about list_managed_instances

What does the list_managed_instances tool do? +

Lists managed instances for a given managed instance group (MIG). For each instance, details include id, instance URL, instance status, and current action. Requires project, zone, and MIG name as input. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.

What parameters does list_managed_instances accept? +

list_managed_instances accepts 5 parameters: name, zone, project, pageSize, pageToken. Required: name, zone, project. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on list_managed_instances? +

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

What risk level is list_managed_instances? +

list_managed_instances is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_managed_instances? +

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

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

list_managed_instances is provided by the MCP server (https://compute.googleapis.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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