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arjungowdal4601

Read-Only vSphere MCP Server

vsphere_list_vms

Read-onlyIdempotent

Query vCenter for virtual machines filtered by names, folders, datacenters, hosts, clusters, resource pools, or power states.

Instructions

List visible virtual machines using the vSphere Automation REST API.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
vmsNo
hostsNo
namesNo
foldersNo
clustersNo
datacentersNo
power_statesNo
resource_poolsNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and non-destructive. Description adds no extra behavioral context beyond annotations, so minimal value.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Single sentence, very concise. However, it omits critical parameter information, so it's not optimally structured despite brevity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With 8 optional parameters and an output schema, the description fails to explain filtering capabilities or output details. Incomplete for a parameter-rich tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% and the description does not explain any of the 8 optional filter parameters (vms, hosts, names, etc.). The agent must guess their purpose from names alone, which is insufficient.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states 'List visible virtual machines' with a specific verb and resource. Distinguishes itself from sibling tools like vsphere_get_vm and other list tools.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool versus alternatives like vsphere_get_vm or when filtering is needed. Missing any usage context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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