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vcenter-mcp

License: MIT PyPI Python 3.10+

Ask GitHub Copilot questions about your Broadcom VCF and VMware vCenter environment in plain English — clusters, datacenters, datastores, folders, hosts, networks, resource pools, VMs, guest details, appliance version and time, and more — directly from VS Code.

Supports Broadcom VCF vCenter Server Appliance and VMware vCenter Server Appliance — with per-vCenter credentials stored securely in your OS keyring (Windows Credential Manager / macOS Keychain / Linux Secret Service).

Requirements

Related MCP server: VMware-AIops

Quick start

# 1. Install
pip install vcenter-mcp

# 2. Create a folder for your inventory, navigate to it, and run the wizard
mkdir my-vcenter && cd my-vcenter
vcenter-mcp configure

The wizard will:

  • Verify Python 3.10+ is active

  • Install / update all dependencies

  • Register your vCenter Server Appliance instance(s) in inventory.yaml

  • Store credentials securely in the OS keyring — no plain-text passwords anywhere

  • Write .vscode/mcp.json pointing VS Code at the server (no credentials in this file)

# 3. Open the folder in VS Code
code .

In VS Code, open Copilot Chat, switch to Agent mode, and start asking questions.

Already set up? Re-run vcenter-mcp configure at any time to add new vCenter instances and to update credentials.

Configuration

Credential storage

Credentials are stored in the OS keyring under the service name vcenter-mcp. Key format:

Entity

Keyring key examples

vCenter (default)

vcenter.default.username, vcenter.default.password

vCenter (override)

vcenter.VCENTER-NAME.username, vcenter.VCENTER-NAME.password

Lookup falls back from named entry → vcenter.default.* → environment variables (VCENTER_USERNAME etc.) for compatibility and automation.

vCenter inventory — inventory.yaml

Register your instances here. Edit directly or re-run vcenter-mcp configure.

vcenters:
  - name: PROD-VCENTER-1
    fqdn: vcsa01.example.local
    ip_address: 192.168.1.10
    verify_ssl: false

  - name: PROD-VCENTER-2
    fqdn: vcsa02.example.local
    ip_address: 192.168.1.11
    verify_ssl: true
  • name — label used in prompts and tool parameters (vcenter_name)

  • fqdn or ip_address — at least one is required; if both are provided, fqdn is preferred

  • Single entry → selected automatically; multiple entries → specify the name in your prompt

VS Code — .vscode/mcp.json

Generated by vcenter-mcp configure. Contains no credentials:

{
  "servers": {
    "vcenter-mcp": {
      "type": "stdio",
      "command": "vcenter-mcp",
      "env": {
        "VCENTER_MCP_INVENTORY": "${workspaceFolder}/inventory.yaml"
      }
    }
  }
}

Usage

Switch Copilot Chat to Agent mode and ask in plain English:

List all VMs and their power state
Show me all clusters and datacenters
Which hosts are in the cluster and what version are they running?
List all datastores and their free capacity
Show me the networks in vCenter
Get guest identity details for VM <vm-id>
Show me the appliance version and time

Target a specific vCenter by name:

List all VMs from PROD-VCENTER-1
Show appliance version for PROD-VCENTER-1
List all datastores from PROD-VCENTER-2

Copilot calls list_vcenters automatically when needed to discover available entries.

Project structure

vcenter-mcp/
├── inventory.yaml              vCenter registry (user-generated)
├── pyproject.toml              Package metadata and dependencies
├── available_tools.md          Full tool reference
├── SECURITY_POSTURE.md         Security posture, cautions, and operational guidance
└── src/
    └── vcenter_mcp/
        ├── __init__.py
        ├── app.py              Shared FastMCP instance ("vcenter-mcp")
        ├── cli.py              Entry point — 'vcenter-mcp' and 'vcenter-mcp configure'
        ├── server.py           Thin wrapper delegating to cli.main()
        ├── credentials.py      OS keyring read/write helpers
        ├── registry.py         Inventory loading, host+credential resolver, JSON helper
        ├── client.py           HTTP client: session auth and policy-validated GET requests
        ├── security.py         Central security policy, limits, and startup config validation
        ├── vsphere_ws.py       vSphere Web Services helpers for ESXi host detail
        └── tools/
            ├── inventory.py            list_vcenters, get_vcenter_inventory
            ├── vcenter_inventory.py    list_clusters, get_cluster,
            │                           get_cluster_resource_utilization_ws,
            │                           get_cluster_cpu_memory_utilization_period_ws,
            │                           get_cluster_cpu_memory_daily_rollup_ws,
            │                           get_cluster_cpu_memory_utilization_window_ws,
            │                           list_datacenters, get_datacenter,
            │                           list_datastores, get_datastore,
            │                           list_folders,
            │                           list_hosts, get_host,
            │                           list_networks,
            │                           list_resource_pools, get_resource_pool,
            │                           list_vms, get_vm
            ├── vm_details.py           get_vm_guest_identity, list_vm_guest_local_filesystems,
            │                           list_vm_guest_network_interfaces, get_vm_hardware,
            │                           get_vm_boot, get_vm_cpu, get_vm_memory,
            │                           list_vm_disks, get_vm_disk,
            │                           list_vm_nics, get_vm_nic
            └── appliance.py            get_appliance_version, get_appliance_time

See available_tools.md for the full tool reference including parameters, return values, and source modules.

Notes

  • All tools are read-only — no changes are made to your vCenter environment

  • Uses the vCenter REST API at /api/* over HTTPS, typically port 443

  • Uses the vSphere Web Services API through vCenter for list_hosts and get_host, because REST host detail coverage is not available in vCenter API surface

  • Cluster window utilization tool behavior: supports 1-30 day windows and hour inputs only when they are multiples of 24 (for example 24 hours, 168 hours)

  • Historical utilization output depends on PerformanceManager retention in your vCenter; requested windows may return fewer samples if older data is not retained

  • Authentication uses POST /api/session and reuses the session token for tool calls

  • If multiple vCenters are configured, specify vcenter_name to target the correct instance

  • Transport is stdio — the server runs locally and is managed by VS Code

Security

See SECURITY_POSTURE.md for current security controls, hardening behavior, and operational cautions.

Disclaimer

This is an independent, community-built project and is not an official Broadcom or VMware product. It is not affiliated with, endorsed by, or supported by Broadcom Inc. or VMware by Broadcom in any way. VMware, vSphere, vCenter, and VCF are trademarks of their respective owners.

Available Tools

33 tools
get_appliance_timeC

Get current appliance time settings.

ParametersJSON Schema
NameRequiredDescriptionDefault
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.7/5.0
Behavior2/5

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

No annotations exist, and the description only states 'Get current appliance time settings,' implying a read operation. It fails to disclose any additional behavioral traits such as authentication requirements, side effects, or constraints.

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

Conciseness3/5

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

The description is very concise (one sentence), but it omits critical details about parameters. While brevity is valued, it should not come at the expense of necessary information.

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?

Given the tool has an output schema, the description could be minimal, but it does not clarify what 'current appliance time settings' includes (e.g., time zone, NTP status, current time). The single optional parameter is not contextualized, leaving the agent uncertain about tool usage.

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?

With 0% schema description coverage and no explanation of the optional 'vcenter_name' parameter, the description adds no meaning beyond the schema. The agent cannot infer the role or expected values of this parameter.

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?

The description clearly states 'Get current appliance time settings' with a specific verb and resource. Among siblings, it uniquely identifies the tool for time settings, distinguishing it from other get_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 usage guidelines are provided. The description does not indicate when to use this tool, prerequisites, or alternatives among the many sibling tools.

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

get_appliance_versionC

Get appliance version information.

ParametersJSON Schema
NameRequiredDescriptionDefault
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.8/5.0
Behavior2/5

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

No annotations are provided, so the description must cover behavioral traits. It only states it gets version info, omitting details about authentication, rate limits, or behavior with null parameters.

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

Conciseness2/5

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

The description is a single sentence, but it is too brief to be useful. It lacks necessary detail and does not earn its place as a concise yet informative statement.

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?

Despite having an output schema, the description omits context about the optional parameter and does not clarify behavior when 'vcenter_name' is null, making it incomplete.

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?

The input schema has one optional parameter with 0% description coverage. The description adds no meaning to this parameter, leaving its purpose unexplained.

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?

The description clearly states the verb 'Get' and resource 'appliance version information', which is specific and distinguishes it from sibling tools like 'get_appliance_time'.

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

Usage Guidelines3/5

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

The description implies usage for retrieving version info but provides no guidance on when to use it versus alternatives or any exclusions.

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

get_clusterC

Get details for a specific cluster.

ParametersJSON Schema
NameRequiredDescriptionDefault
clusterYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.4/5.0
Behavior1/5

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

With no annotations provided, the description should disclose behavioral traits, but it only repeats the tool name. It fails to mention any required permissions, rate limits, or what 'details' encompasses.

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

Conciseness2/5

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

The description is extremely short but lacks essential information. While concise, it is under-specified and does not earn its place by providing value beyond the tool name.

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?

Despite having an output schema, the description does not hint at the nature of the returned details. It is insufficient for an agent to understand the tool's full scope or behavior.

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%, yet the description adds no explanation for the parameters 'cluster' and 'vcenter_name', leaving the agent without guidance on how to use them correctly.

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?

The description clearly states the action ('Get') and the resource ('details for a specific cluster'), distinguishing it from sibling tools like list_clusters which returns a list, and other get_* tools that focus on different resources.

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 is provided on when to use this tool versus alternatives such as list_clusters or other get_ tools. The description lacks explicit context for selection.

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

get_cluster_cpu_memory_daily_rollup_wsB

Get daily rollups for cluster CPU/memory utilization via Web Services (default 5 days).

ParametersJSON Schema
NameRequiredDescriptionDefault
clusterYes
daysNo
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

B3.1/5.0
Behavior2/5

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

No annotations are provided, so the description carries full burden. It only mentions a default parameter value (already in schema) and does not disclose read-only nature, output shape, or any constraints, which is insufficient for a tool with no annotations.

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 that is direct and front-loaded, but could be more structured with bullet points or parameter details without adding length.

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?

Despite an output schema existing, the description does not explain the output format, aggregation period, or any preconditions. It leaves many questions unanswered for an operation with 3 parameters.

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

Parameters3/5

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

Schema coverage is 0%, so description must compensate. It clarifies the 'days' parameter default but does not describe the 'vcenter_name' parameter at all. Partial improvement over schema, but one parameter remains undocumented.

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?

The description clearly states the tool retrieves daily rollups for cluster CPU/memory utilization, specifies a default of 5 days, and the name 'daily_rollup_ws' distinguishes it from sibling tools like period or window variants.

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 siblings like get_cluster_cpu_memory_utilization_period_ws or get_cluster_resource_utilization_ws. The user is left to infer from the name and description.

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

get_cluster_cpu_memory_utilization_period_wsC

Get time-bound cluster CPU and memory utilization via Web Services (default 5 days).

ParametersJSON Schema
NameRequiredDescriptionDefault
clusterYes
daysNo
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.6/5.0
Behavior2/5

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

No annotations are provided, so the description must fully disclose behavioral traits. It only states it 'Gets' utilization, implying a read operation, but does not mention authentication requirements, rate limits, data freshness, or any side effects. The description is too brief for a tool handling potentially sensitive monitoring data without annotation support.

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

Conciseness3/5

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

The description is a single sentence of 12 words, which is very concise. However, this conciseness sacrifices necessary detail, particularly regarding parameters and sibling differentiation. While front-loaded, it doesn't fully earn its place due to missing critical information.

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?

Given the tool has 3 parameters, no annotations, an output schema, and multiple closely related siblings, the description is insufficiently complete. It lacks parameter explanations, usage context, and behavioral details. The output schema exists but the description could still summarize return structure or error conditions.

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

Parameters2/5

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

The input schema has 0% description coverage, so the description must compensate. It only indirectly relates to the 'days' parameter by mentioning a default of 5 days. The 'cluster' and 'vcenter_name' parameters are not explained at all. The description adds minimal semantic value beyond the schema.

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

Purpose4/5

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

The description clearly states the tool retrieves time-bound cluster CPU and memory utilization via Web Services with a default of 5 days. It identifies the specific verb and resource. However, it does not differentiate from similar sibling tools like get_cluster_cpu_memory_daily_rollup_ws or get_cluster_cpu_memory_utilization_window_ws, which could cause confusion as to which tool to use for a given time range.

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?

The description provides no guidance on when to use this tool versus its siblings or when not to use it. There are multiple similar tools for cluster CPU/memory utilization, yet no comparative context is given. The description lacks any usage conditions or exclusions.

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

get_cluster_cpu_memory_utilization_window_wsC

Get cluster CPU/memory utilization for windows like '24 hours' or '4 days', optionally as per-day averages.

ParametersJSON Schema
NameRequiredDescriptionDefault
clusterYes
windowNo24 hours
per_dayNo
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.8/5.0
Behavior2/5

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

With no annotations, the description must disclose behavioral traits. It indicates a read-only operation but lacks details on permissions, rate limits, data freshness, or sampling methodology. The window and per-day behavior is mentioned but insufficient given no annotation support.

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

Conciseness5/5

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

Single, well-structured sentence with no redundancy. Key information (purpose, window options, per-day flag) is front-loaded and concise.

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?

The tool has 4 parameters (cluster required), but only window and per_day are mentioned. No output schema is provided in the input, but context says it exists. Still, the description leaves gaps on parameter semantics and usage context, making it incomplete for an agent to use correctly.

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

Parameters2/5

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

Schema description coverage is 0%, so the description must compensate. It clarifies the 'window' parameter with examples and the 'per_day' boolean, but omits the required 'cluster' parameter and explains nothing about 'vcenter_name'. Partial coverage, leaving ambiguity.

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

Purpose4/5

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

The description clearly states it retrieves CPU/memory utilization for a cluster, specifying time windows and optional per-day averages. However, it does not differentiate from sibling tools like get_cluster_cpu_memory_daily_rollup_ws or get_cluster_cpu_memory_utilization_period_ws, which may cause confusion.

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 over alternatives. The description provides example window values but fails to mention prerequisites, exclusions, or scenarios where this tool is preferred.

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

get_cluster_resource_utilization_wsC

Get cluster CPU, memory, storage, and IOPS utilization via the vSphere Web Services API.

ParametersJSON Schema
NameRequiredDescriptionDefault
clusterYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.6/5.0
Behavior2/5

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

With no annotations, the description must carry full burden but only states it uses an API. No mention of read-only nature, permissions, rate limits, or side effects. The description is insufficient for behavioral understanding.

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

Conciseness2/5

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

Single sentence is concise but omits critical information like parameter descriptions. The structure lacks the detail necessary for effective tool selection and invocation.

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?

Despite having an output schema, the description is incomplete due to missing parameter details and behavioral context. The tool's purpose is clear but not sufficiently scoped for correct use among siblings.

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 the 'cluster' (required) or 'vcenter_name' (optional) parameters. The agent gets no guidance on what values to provide.

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?

The description clearly states the verb 'Get', the resource 'cluster utilization', and the specific metrics (CPU, memory, storage, IOPS), which differentiates it from sibling tools like get_cluster_cpu_memory_daily_rollup_ws that focus only on CPU and memory.

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 the several other cluster utilization tools (e.g., get_cluster_cpu_memory_utilization_period_ws). The description does not mention prerequisites, context, or alternatives.

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

get_datacenterC

Get datacenter details.

ParametersJSON Schema
NameRequiredDescriptionDefault
datacenterYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.6/5.0
Behavior2/5

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

No annotations are provided, so the description should disclose behavioral traits. It lacks details such as whether the operation is read-only, any prerequisites (e.g., vCenter connection), or the structure of the returned data. For a simple read operation, this is insufficient.

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

Conciseness3/5

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

The description is a single, short sentence, which is concise but at the expense of necessary detail. It does not waste words, but it is too minimal to be fully useful.

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?

Given the tool has an output schema and 2 parameters, the description is inadequate. It does not explain the returned data (even though an output schema exists) or how to use the optional vcenter_name parameter. For a simple tool, more completeness is expected.

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

Parameters2/5

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

Schema description coverage is 0%, meaning the description adds no explanation for parameters. The parameter names 'datacenter' and 'vcenter_name' are somewhat self-explanatory, but the description does not clarify their purpose, format, or constraints beyond the schema types.

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

Purpose4/5

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

The description 'Get datacenter details' clearly states the action (get) and resource (datacenter details), distinguishing it from sibling tools like 'list_datacenters' which returns a list. However, 'details' is vague and doesn't specify what information is included.

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 is provided on when to use this tool versus alternatives such as 'list_datacenters' or other get_* tools. The tool could be used to retrieve specific datacenter information, but this is not explicitly stated.

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

get_datastoreC

Get datastore details.

ParametersJSON Schema
NameRequiredDescriptionDefault
datastoreYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.6/5.0
Behavior2/5

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

Without annotations, the description fails to disclose behavioral traits such as read-only nature, authentication requirements, error handling for non-existent datastores, or rate limits. Merely stating 'Get datastore details' is insufficient for transparency.

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

Conciseness3/5

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

The description is extremely concise at one sentence, but this brevity sacrifices important details. It is front-loaded but lacks structure that could easily include parameter guidance or usage context without becoming verbose.

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 an output schema present, return values don't need description, but the tool still lacks context for input parameters, prerequisites, and precise purpose. The description is too minimal for a tool with 0% schema description coverage and no annotations.

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

Parameters2/5

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

Schema description coverage is 0%, yet the description adds no explanation for the parameters 'datastore' (string identifier) and 'vcenter_name' (optional). Parameter names are somewhat self-explanatory but incomplete without clarifying expected format or source.

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

Purpose4/5

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

The description 'Get datastore details' clearly indicates a retrieval operation for a datastore, distinguishing it from list_datastores which returns a list. However, it doesn't specify what 'details' entails, which could be more explicit.

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 list_datastores or other get_* tools. Lacks context about prerequisites (e.g., needing a datastore identifier from list_datastores).

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

get_hostC

Get details for a specific physical ESXi host via the vSphere Web Services API.

ParametersJSON Schema
NameRequiredDescriptionDefault
hostYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.7/5.0
Behavior2/5

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

No annotations are provided, so the description must convey behavioral traits. It only says 'get details' without mentioning authentication requirements, side effects (none expected), rate limits, or pagination. For a read operation, minimal transparency is offered.

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

Conciseness3/5

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

The description is a single concise sentence, but it omits crucial details about parameters and usage. Conciseness in this case leads to under-specification, not efficiency. A bit more structure with parameter guidance would improve it.

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?

Despite the presence of an output schema (which can explain return values), the description lacks parameter semantics and usage context. With two parameters (one required) and zero explanation, the tool is incomplete for an agent selecting and invoking it correctly.

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%. The description does not explain the two parameters ('host' and 'vcenter_name'). It fails to clarify acceptable formats, sources, or the role of the optional 'vcenter_name' parameter. With zero parameter info, the description is severely lacking.

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?

The description clearly states the action ('Get details'), the resource ('specific physical ESXi host'), and the method ('via the vSphere Web Services API'). It effectively distinguishes from sibling tools like 'list_hosts' and other 'get_*' tools that target different entities.

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?

The description provides no guidance on when to use this tool versus alternatives (e.g., 'list_hosts' for listing all hosts, or other 'get_*' tools for different resources). There are no explicit context or exclusion criteria.

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

get_resource_poolC

Get resource pool details.

ParametersJSON Schema
NameRequiredDescriptionDefault
resource_poolYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.4/5.0
Behavior2/5

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

No annotations are provided, and the description is too brief to disclose any behavioral traits (e.g., read-only, side effects, permissions). The description only says 'Get resource pool details' which implies read-only but offers no further context.

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

Conciseness2/5

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

The description is extremely short (3 words). While concise, it is under-specified and fails to provide essential information. It does not earn its place as it adds no value beyond the name.

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

Completeness3/5

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

Given there is an output schema (signal: has output schema=true), the description might rely on that for return value details. However, with two parameters and no description, the tool definition is incomplete for an agent to correctly invoke without additional knowledge.

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% (no descriptions for parameters), and the tool description does not explain the parameters (resource_pool, vcenter_name). Their meanings, formats, or required values are not clarified.

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

Purpose4/5

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

The description clearly states the action (Get) and resource (resource pool details). However, it does not differentiate from sibling tools like list_resource_pools, which might also provide details. A 4 is appropriate because it's clear but lacks specificity.

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 usage guidance is provided. The description does not indicate when to use this tool vs siblings (e.g., list_resource_pools for listing all, or get_resource_pool for a single one). No when-to-use or when-not-to-use context.

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

get_vcenter_inventoryC

Return configured inventory entries and guidance for using vCenter tools.

ParametersJSON Schema
NameRequiredDescriptionDefault
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.8/5.0
Behavior2/5

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

With no annotations, the description must disclose behavioral traits, but it only states the tool returns data. It does not mention side effects, authentication needs, or that it is read-only, which is a significant gap.

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

Conciseness5/5

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

The description is a single, front-loaded sentence with no redundant words. It efficiently conveys the core action and resource.

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

Completeness3/5

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

The description is minimal but may be sufficient given the output schema exists. However, it lacks context about what 'inventory entries' and 'guidance' entail, falling short of full completeness for a tool with no annotations.

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?

The schema has 0% description coverage for the single optional parameter 'vcenter_name,' and the description does not elaborate on its purpose or effect. The agent receives no semantic help beyond the schema type.

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

Purpose4/5

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

The description uses the verb 'return' and specifies the resource as 'configured inventory entries and guidance for using vCenter tools.' This distinguishes it from siblings that focus on specific resources like clusters or VMs, though 'guidance' is somewhat vague.

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 is provided on when to use this tool versus the many sibling tools. There is no mention of contexts, exclusions, or alternative tools, leaving the agent to infer usage.

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

get_vmB

Get VM summary details.

ParametersJSON Schema
NameRequiredDescriptionDefault
vmYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

B3/5.0
Behavior2/5

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

No annotations are provided, so the description must disclose behavioral traits. It does not mention authentication, response format, or what 'summary details' entail. The output schema exists but is not referenced in the description, leaving gaps.

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?

The description is very short and front-loaded, consisting of a single purposeful phrase. However, it could benefit from additional context without losing conciseness, such as mentioning that it returns a summary of key VM properties.

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?

Given the presence of an output schema, return values need not be explained, but the description still lacks completeness. It does not specify the scope of 'summary,' prerequisites, or any constraints. The absence of annotations exacerbates the gap.

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?

The description adds no meaning beyond the input schema. With 0% schema description coverage, both parameters (vm and vcenter_name) are left unexplained. The description does not clarify what values are expected or their purpose.

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?

The description clearly states 'Get VM summary details,' specifying a verb and resource. It effectively distinguishes from sibling tools like get_vm_cpu or get_vm_disk, which target specific aspects, whereas this tool provides an overview.

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

Usage Guidelines3/5

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

There is no explicit guidance on when to use this tool versus alternatives such as list_vms or specific get_vm_* tools. The phrase 'summary details' implies a broad overview, but without exclusion criteria or context, usage remains ambiguous.

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

get_vm_bootC

Get VM boot configuration.

ParametersJSON Schema
NameRequiredDescriptionDefault
vmYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.4/5.0
Behavior2/5

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

Without annotations, the description carries full behavioral burden. It only states 'Get,' implying a read operation, but offers no details on permissions, error behavior, or side effects. This is insufficient for an agent to understand the tool's implications.

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

Conciseness3/5

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

The description is a single short sentence, making it concise but lacking structure. Every word earns its place, but it is too minimal to be considered well-structured for an informative definition.

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?

Given the tool has two parameters and an output schema, the description fails to provide adequate context for usage. It does not explain what boot configuration entails, how parameters are used, or any relevant context, making it barely sufficient.

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 fails to explain any parameters. The agent cannot infer the meaning or constraints of 'vm' or 'vcenter_name' from the description alone, severely limiting correct invocation.

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

Purpose4/5

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

The description clearly states the verb 'Get' and the resource 'VM boot configuration,' distinguishing it from sibling tools like 'get_vm_cpu' or 'get_vm_memory.' However, it lacks context on what boot configuration includes, which slightly reduces clarity.

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 is provided on when to use this tool versus alternatives. The description does not mention prerequisites, use cases, or exclusion conditions, leaving the agent without context for correct selection.

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

get_vm_cpuC

Get VM CPU configuration.

ParametersJSON Schema
NameRequiredDescriptionDefault
vmYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.6/5.0
Behavior2/5

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

No annotations exist, and the description only states the purpose without disclosing behavioral traits like authentication requirements, error behavior, or result format.

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

Conciseness3/5

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

The description is a single sentence, making it concise but under-specified; it lacks details that would earn each word's place.

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

Completeness1/5

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

With two parameters, no descriptive text, and no annotations, the description fails to provide sufficient context for an AI agent to use the tool correctly, despite the existence of an output schema.

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 coverage is 0%, and the description adds no meaning to the parameters 'vm' or 'vcenter_name'. The description does not compensate for the lack of schema documentation.

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?

The description 'Get VM CPU configuration' clearly states the action (get) and the specific resource (VM CPU configuration), distinguishing it from siblings like get_vm_memory or get_vm_disk.

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 is provided on when to use this tool versus alternatives such as get_vm_memory or list_vms. There are no context cues or exclusions.

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

get_vm_diskC

Get a virtual disk by disk identifier.

ParametersJSON Schema
NameRequiredDescriptionDefault
vmYes
diskYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.6/5.0
Behavior2/5

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

The description does not disclose behavioral traits such as whether the tool is read-only, what happens if the disk is not found, or any required permissions. With no annotations provided, the description fails to provide necessary context.

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?

The description is a single sentence, concise and front-loaded with the key action. However, it is too brief and lacks supporting details, making it less valuable.

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?

The tool has an output schema, which reduces the need to describe return values. However, with three parameters (two required) and no parameter descriptions or usage context, the description is insufficient for an agent to use the tool correctly.

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%, meaning the schema provides no descriptions for the three parameters. The description does not add any meaning beyond the parameter names (vm, disk, vcenter_name). This leaves agents to infer parameter usage from names alone.

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

Purpose4/5

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

The description clearly states the action: 'Get a virtual disk by disk identifier.' It implies fetching a single disk, which distinguishes it from the sibling tool 'list_vm_disks' that lists multiple disks. However, it does not explicitly differentiate itself from other get_* 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 is provided on when to use this tool versus alternatives (e.g., list_vm_disks for listing all disks). There are no prerequisites, caveats, or when-not-to-use instructions.

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

get_vm_guest_identityC

Get guest identity details for a VM.

ParametersJSON Schema
NameRequiredDescriptionDefault
vmYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.6/5.0
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure, but it only states a generic 'Get' operation. It does not mention whether the VM must be powered on, if guest tools are required, or any side effects. The agent cannot infer constraints or behaviors from the description alone.

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

Conciseness3/5

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

The description is a single sentence that front-loads the verb and resource. It is concise but at the expense of necessary detail. It is appropriately sized for a simple idea but lacks completeness for the tool's context.

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?

Given the presence of an output schema, the description need not detail return values, but it should still cover essential context. It fails to mention dependencies (e.g., guest tools), potential failure modes, or how this tool relates to sibling tools. The agent is left with an incomplete understanding.

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

Parameters2/5

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

Schema description coverage is 0%, so the description should compensate by explaining parameter meanings. However, it does not mention the 'vm' or 'vcenter_name' parameters at all. The agent must guess the format or purpose (e.g., whether 'vm' is an ID or name) from the schema's minimal type information.

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

Purpose4/5

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

The description 'Get guest identity details for a VM.' clearly states the verb ('Get') and the resource ('guest identity details for a VM'). It distinguishes from sibling tools like get_vm_cpu or get_vm_memory by focusing on identity details, though it does not specify what those details are (e.g., OS, hostname).

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?

There is no guidance on when to use this tool vs. alternatives. Among many get_vm_* and list_vm_* siblings, the description offers no context on prerequisites (e.g., guest tools), nor does it indicate what scenarios are appropriate for this tool.

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

get_vm_hardwareC

Get VM hardware summary.

ParametersJSON Schema
NameRequiredDescriptionDefault
vmYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.4/5.0
Behavior2/5

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

No annotations are provided, and the description does not disclose any behavioral traits (e.g., read-only, permissions required, rate limits). The minimal phrase 'get' implies a read operation, but it is not explicit.

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

Conciseness3/5

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

The description is a single short sentence, which is concise but underspecified. It is front-loaded but sacrifices clarity for 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?

Despite having an output schema, the description leaves significant gaps: no parameter details, no behavioral context, and no differentiation from numerous sibling tools. It is not complete enough for an agent to use effectively.

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

Parameters2/5

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

Schema description coverage is 0%, meaning the schema itself has no parameter descriptions. The tool description adds no information about what 'vm' or 'vcenter_name' should contain (e.g., ID, name). It fails to compensate for the schema gap.

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

Purpose3/5

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

The description states 'Get VM hardware summary,' which is a clear verb+resource but vague compared to siblings like get_vm_cpu or get_vm_memory. It does not distinguish what 'hardware summary' includes versus other VM-specific 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 guidelines on when to use this tool versus its many siblings (e.g., get_vm_cpu, get_vm_disk). The description provides no context for choosing this tool over alternatives.

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

get_vm_memoryC

Get VM memory configuration.

ParametersJSON Schema
NameRequiredDescriptionDefault
vmYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.6/5.0
Behavior2/5

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

No annotations are provided, and the description does not disclose any behavioral traits such as read-only nature, rate limits, or side effects. The minimal description fails to compensate for the lack of annotations.

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?

Description is very short at one sentence, which is concise. It is front-loaded with the action and resource, but may be overly terse.

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?

Given the tool has 2 parameters and an output schema, the description is incomplete. It does not explain what memory configuration entails or what the return value contains, leaving the agent without sufficient context.

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%, meaning the description does not explain the parameters (vm, vcenter_name) beyond what the schema provides. It adds no additional context about parameter meaning or usage.

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

Purpose4/5

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

Description clearly states the verb 'Get' and resource 'VM memory configuration', which directly indicates the tool's purpose. It distinguishes from sibling tools like get_vm_cpu or get_vm_disk by focusing on memory.

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. The description does not specify prerequisites or context, leaving the agent to infer from the name alone.

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

get_vm_nicC

Get a single VM virtual NIC.

ParametersJSON Schema
NameRequiredDescriptionDefault
vmYes
nicYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.6/5.0
Behavior2/5

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

No annotations are provided, and the description gives no behavioral details such as authentication requirements, error conditions, or what happens if the NIC is not found. For a simple get operation, it could mention that it returns detailed NIC information.

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

Conciseness2/5

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

The description is extremely short but fails to include necessary information. Conciseness is not a virtue when it omits essential details.

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?

Given that an output schema exists, the description does not need to explain return values, but it still lacks context about when to use this tool and what it accomplishes beyond the name.

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 the purpose or format of any parameters (vm, nic, vcenter_name). The description adds no value beyond what the schema structure provides.

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?

The description 'Get a single VM virtual NIC' clearly states the verb (Get) and resource (VM virtual NIC), distinguishing it from sibling tools like list_vm_nics which lists all NICs.

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 is given on when to use this tool versus alternatives such as list_vm_nics. The description does not mention any exclusions or context.

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

list_clustersB

List vCenter clusters, optionally filtered by cluster IDs or datacenter IDs.

ParametersJSON Schema
NameRequiredDescriptionDefault
vcenter_nameNo
clustersNo
datacentersNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

B3.2/5.0
Behavior2/5

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

No annotations are provided, so the description must disclose behavioral traits. It implies a read operation ('list') but lacks details on side effects, authentication needs, or error behavior.

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, front-loaded with the verb and resource. Very concise, but at the cost of missing important details. Could include more without becoming verbose.

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 no annotations and an output schema present, the description should compensate. It fails to clarify parameter usage, pagination, or default behavior (e.g., listing all clusters if no filters). Incomplete for an agent to reliably invoke.

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

Parameters2/5

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

Schema coverage is 0%, so description must explain parameters. It only references two of three parameters (clusters, datacenters) and does not clarify value formats (e.g., comma-separated, wildcard). The 'vcenter_name' parameter is unmentioned.

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 the tool lists vCenter clusters with optional filtering by cluster or datacenter IDs. Differentiates from sibling 'get_cluster' (singular) 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 Guidelines3/5

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

Mentions optional filtering by cluster IDs or datacenter IDs, but does not explicitly state when to use this tool vs alternatives (e.g., get_cluster for a single cluster), nor provide prerequisites or exclusions.

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

list_datacentersC

List datacenters visible in vCenter.

ParametersJSON Schema
NameRequiredDescriptionDefault
vcenter_nameNo
datacentersNo
foldersNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.6/5.0
Behavior2/5

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

No annotations provided, so description carries full burden. It only states 'visible in vCenter' but does not disclose any behavioral traits like order, pagination, or permissions.

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?

The description is very short but covers the core purpose. It could benefit from adding parameter explanations without becoming verbose.

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?

Given three optional parameters and an output schema, the description lacks details on how to use the tool effectively. It does not explain filtering or output format.

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 coverage is 0%, and the description does not explain any of the three optional parameters (vcenter_name, datacenters, folders). The agent cannot infer their meaning from the description.

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

Purpose4/5

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

The description clearly states it lists datacenters visible in vCenter, which matches the tool name. However, it does not differentiate from sibling tools like 'list_clusters' or 'list_hosts' beyond the resource type.

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. Sibling tools exist for different resources, but the description provides no context about filtering or prerequisites.

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

list_datastoresB

List datastores with optional filters.

ParametersJSON Schema
NameRequiredDescriptionDefault
vcenter_nameNo
datastoresNo
namesNo
foldersNo
datacentersNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

B3.1/5.0
Behavior2/5

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

No annotations are provided, and the description does not disclose any behavioral traits such as authentication requirements, rate limits, or side effects. It only states the basic functionality without adding transparency beyond that.

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

Conciseness5/5

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

The description is extremely concise at 5 words, front-loaded with the verb, and contains no unnecessary information. Every word earns its place.

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?

The description is minimal for a tool with 5 parameters and no parameter documentation. Although there is an output schema, the description does not help the agent understand the filtering capability or the purpose of each parameter.

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

Parameters2/5

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

Schema description coverage is 0%, but the description only mentions 'optional filters' without explaining any of the five parameters. The parameter names (e.g., vcenter_name, datastores) are not elaborated, leaving the agent without meaningful guidance.

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?

The description 'List datastores with optional filters.' clearly states the action ('List'), the resource ('datastores'), and the capability (filters). It distinguishes from sibling tools like get_datastore which retrieves a single datastore.

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 is provided on when to use this tool versus alternatives such as get_datastore or list_clusters. The description lacks any context about use cases or exclusions.

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

list_foldersC

List folders with optional filters.

ParametersJSON Schema
NameRequiredDescriptionDefault
vcenter_nameNo
foldersNo
namesNo
typesNo
datacentersNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.4/5.0
Behavior2/5

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

No annotations are provided, and the description only mentions 'optional filters' without disclosing any behavioral traits such as pagination, limits, default behavior when no filters are applied, or whether the operation is read-only. This is a significant gap for a tool with five parameters.

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

Conciseness3/5

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

The description is a single sentence, which is concise, but it lacks structure or any additional details. While brevity is positive, it sacrifices necessary information.

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?

Given the five optional parameters and lack of annotations, the description is insufficient. It does not explain the return value format, even though an output schema exists. The tool is minimally viable but could benefit from clarifying scope and typical use cases.

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 provides no explanation of the parameters. The agent must infer from parameter names like vcenter_name, folders, names, types, and datacenters, but the description adds no value beyond listing them as 'optional filters'.

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

Purpose4/5

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

The description 'List folders with optional filters' clearly states the verb (list) and resource (folders), and hints at filtering. It differentiates from sibling tools like list_hosts or list_datacenters, but lacks specificity about what type of folders (e.g., VM folders, datastore folders) are being listed.

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 is provided on when to use this tool versus alternatives. For example, it does not clarify if this should be used to filter folders for a specific vCenter or datacenter context. The description offers no conditions, prerequisites, or exclusions.

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

list_hostsC

List ESXi hosts with optional filters via the vSphere Web Services API.

ParametersJSON Schema
NameRequiredDescriptionDefault
vcenter_nameNo
hostsNo
namesNo
clustersNo
datacentersNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.7/5.0
Behavior2/5

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

With no annotations, the description must disclose behavioral traits. It only mentions listing with optional filters, omitting details on side effects, authentication requirements, pagination, or result scope. This is insufficient for an AI agent to understand the tool's behavior.

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?

The description is a single concise sentence, which is appropriately front-loaded. However, its brevity sacrifices necessary detail, making it less effective than a slightly longer but more informative description.

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?

Given the tool's complexity (5 parameters, none explained) and the presence of an output schema, the description is incomplete. It does not cover parameter meaning, usage examples, or any constraints, leaving agents under-informed.

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

Parameters2/5

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

Schema description coverage is 0%, so the description bears full responsibility for explaining parameters. It only says 'optional filters' without mapping to the five parameters (vcenter_name, hosts, names, clusters, datacenters). The agent cannot infer what each filter does.

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

Purpose4/5

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

The description clearly states the tool lists ESXi hosts with optional filters, providing a specific verb and resource. However, it does not explicitly distinguish from sibling tools like get_host or list_vms, which limits its purpose clarity.

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 is provided on when to use this tool versus alternatives such as get_host for specific hosts or list_clusters for cluster-level information. The description lacks any context about typical use cases or prerequisites.

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

list_networksC

List networks and distributed port groups.

ParametersJSON Schema
NameRequiredDescriptionDefault
vcenter_nameNo
networksNo
namesNo
datacentersNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.4/5.0
Behavior2/5

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

With no annotations, the description carries the full burden of disclosing behavioral traits. It only states the basic action, omitting details like authentication requirements, read-only safety, pagination, or whether it performs a live query. The input schema hints at filtering, but this is not mentioned.

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

Conciseness3/5

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

The description is extremely concise at six words, which is efficient but insufficiently informative. It lacks any structural front-loading or additional detail, making it a borderline under-specification rather than effective conciseness.

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?

Given the presence of an output schema, the description does not need to explain return values. However, it fails to provide essential context such as the scope of listing (e.g., all networks, filtered by vcenter or datacenter) or any side effects. This leaves the agent with insufficient information to use the tool correctly.

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 tool description does not mention any parameters. The four parameters (vcenter_name, networks, names, datacenters) are ambiguous without further explanation, especially 'networks', which could be a filter or a list of network IDs.

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

Purpose4/5

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

The description clearly states the tool lists networks and distributed port groups, which is a specific verb and resource. However, it does not differentiate itself from other list tools among siblings, such as list_datacenters or list_clusters, which follow a similar pattern.

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 is provided on when to use this tool versus alternatives. There are no context cues about prerequisites, typical use cases, or scenarios where other tools would be more appropriate.

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

list_resource_poolsC

List resource pools with optional filters.

ParametersJSON Schema
NameRequiredDescriptionDefault
vcenter_nameNo
resource_poolsNo
namesNo
hostsNo
clustersNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.7/5.0
Behavior2/5

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

No annotations are provided, and the description fails to disclose behavioral traits such as pagination, result limits, authorization requirements, or side effects. The terseness leaves the agent uncertain about what 'list' entails.

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?

The description is a single, concise sentence. It covers the core purpose without excess verbiage, though it could benefit from a bit more context without sacrificing conciseness.

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?

Given the 5 optional parameters, lack of annotations, and existence of an output schema, the description is insufficient. It does not explain what filters do, what the output contains, or how to handle typical use cases, leaving significant gaps for the agent.

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

Parameters2/5

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 the parameters beyond their names. While names like 'vcenter_name' and 'clusters' offer some clues, the lack of detail on expected formats, filtering behavior, or default values leaves significant ambiguity.

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

Purpose4/5

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

The description clearly states the action ('list') and resource ('resource pools') and mentions optional filters. However, it does not differentiate from the sibling 'get_resource_pool' tool or specify what filters are available, leaving slight ambiguity.

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 is provided on when to use this tool versus alternatives like 'get_resource_pool'. There is no mention of context, prerequisites, or exclusion criteria, leaving the agent without direction.

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

list_vcentersA

List configured vCenter instances from inventory.yaml.

ParametersJSON Schema
NameRequiredDescriptionDefault

No parameters

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

A3.9/5.0
Behavior3/5

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

The description discloses the data source (inventory.yaml) but lacks additional behavioral details like whether it returns all instances or supports filtering, and there are no annotations to supplement.

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

Conciseness5/5

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

A single, front-loaded sentence with no fluff—every word earns its place.

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

Completeness5/5

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

For a parameterless tool with an output schema, the description is complete. It names the source and action, sufficient for an agent to invoke correctly.

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

Parameters4/5

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

The input schema has no parameters, so schema coverage is 100%. The description adds no param info, but none is needed; baseline 4 applies.

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?

The description clearly states the tool lists vCenter instances from inventory.yaml, with a specific verb and resource, distinct from siblings that list other entities like clusters or datastores.

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 such as list_clusters or get_vcenter_inventory. The description does not mention prerequisites or context.

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

list_vm_disksC

List virtual disks for a VM.

ParametersJSON Schema
NameRequiredDescriptionDefault
vmYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.7/5.0
Behavior2/5

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

No annotations provided. Description does not disclose behavioral traits (e.g., read-only, permissions, pagination). With annotations absent, the description carries the full burden and fails to add behavioral context.

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, could be structured slightly better by including parameter context, but for a simple list tool, it is acceptable.

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?

Given lack of parameter descriptions (0% coverage) and no behavioral info, the description is incomplete. Even with an output schema present, it does not describe the return value or list intent beyond the name.

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

Parameters2/5

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

Schema description coverage is 0%, yet the description only says 'List virtual disks for a VM.' It does not explain what 'vm' or 'vcenter_name' represent, nor their format or constraints.

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

Purpose4/5

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

The description 'List virtual disks for a VM.' clearly states the verb (list) and resource (virtual disks for a VM). It distinguishes from sibling like 'get_vm_disk' (singular) and 'get_vm' (VM details), though not explicitly.

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 vs alternatives like 'get_vm_disk' or 'get_vm'. No mention of prerequisites or exclusions.

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

list_vm_guest_local_filesystemsC

List guest local filesystems for a VM.

ParametersJSON Schema
NameRequiredDescriptionDefault
vmYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.7/5.0
Behavior2/5

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

With no annotations, the description bears full burden for behavioral disclosure. It only states the basic action, without detailing permissions, mutability, or constraints like what constitutes 'local' filesystems.

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

Conciseness3/5

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

The description is a single sentence with no redundancy, but it is too brief to be fully informative; it could be expanded slightly without losing conciseness.

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?

Although an output schema exists, the description does not mention what information is returned (e.g., mount points, capacity). Given the tool's specificity, more context is needed for complete understanding.

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%, but the description adds no explanation for the two parameters (vm, vcenter_name), leaving the agent to infer their meaning from names alone.

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?

The description 'List guest local filesystems for a VM.' uses a specific verb and resource, and clearly distinguishes from sibling tools like list_vm_disks and list_vm_guest_network_interfaces.

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 is provided on when to use this tool versus alternatives, nor any prerequisites or context for its use.

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

list_vm_guest_network_interfacesB

List guest network interfaces for a VM.

ParametersJSON Schema
NameRequiredDescriptionDefault
vmYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

B3.2/5.0
Behavior2/5

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

No annotations are provided, and the description only says 'List guest network interfaces' without disclosing behavioral traits like permission requirements, VM state dependencies, or response structure. Minimal transparency.

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

Conciseness5/5

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

Single sentence, efficiently front-loaded with verb and resource. No unnecessary words.

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

Completeness3/5

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

Given the output schema exists, the description is adequate for a basic listing tool, but lacks context about guest OS dependency (e.g., VMware Tools) or VM state. Could be more complete.

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

Parameters2/5

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

Schema coverage is 0%, and the description adds no meaning beyond parameter names. The 'vm' and 'vcenter_name' parameters are not elaborated, leaving ambiguity about format or constraints.

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?

The description clearly states the action (list) and resource (guest network interfaces for a VM), distinguishing it from siblings like list_vm_nics which lists virtual NICs.

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 (e.g., list_vm_nics). No context on prerequisites or typical use cases.

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

list_vm_nicsC

List VM virtual NICs.

ParametersJSON Schema
NameRequiredDescriptionDefault
vmYes
vcenter_nameNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.4/5.0
Behavior2/5

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

No annotations are provided, and the description only states it lists NICs. It does not disclose any behavioral traits such as required permissions, whether it lists all NICs, or any side effects.

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

Conciseness3/5

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

The description is very concise with one sentence, but it is appropriately sized given the tool's simplicity. However, it lacks any structural elements like bullet points or sections.

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?

Given the tool has 2 parameters and no schema descriptions, the description is incomplete. It misses parameter semantics, sibling differentiation, and behavioral context, leaving gaps for an AI agent to correctly invoke the 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?

With 0% schema description coverage, the description adds no meaning to the parameters 'vm' and 'vcenter_name'. It does not clarify what 'vm' refers to (e.g., ID or name) or how 'vcenter_name' is used.

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

Purpose4/5

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

The description uses a specific verb 'List' and resource 'VM virtual NICs', clearly indicating the tool's purpose. However, it does not differentiate from the sibling tool 'get_vm_nic', which likely returns similar information.

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?

The description provides no guidance on when to use this tool versus alternatives like 'get_vm_nic', nor does it mention prerequisites (e.g., VM must exist) or contextual scenarios.

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

list_vmsC

List VMs with optional inventory filters.

ParametersJSON Schema
NameRequiredDescriptionDefault
vcenter_nameNo
vmsNo
namesNo
power_statesNo
hostsNo
clustersNo
foldersNo
datacentersNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

C2.7/5.0
Behavior2/5

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

No annotations are present, and the description does not disclose behavioral traits such as read-only nature, pagination, rate limits, or required permissions. The description is too minimal to inform the agent about side effects or constraints.

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?

The description is a single short sentence, making it very concise. However, it omits important details that could be included without sacrificing conciseness, such as output behavior or filter specifics.

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 no schema descriptions, the description should provide more context on how filters work and what the output contains. The existence of an output schema helps, but the description lacks completeness for a listing tool with many filters.

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

Parameters2/5

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

Schema description coverage is 0%, but the description only says 'optional inventory filters' without explaining parameter formats, relationships, or behavior (e.g., whether parameters accept multiple values or wildcards). The titles in the schema are insufficient, and the description does not compensate.

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

Purpose4/5

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

The description clearly states the verb 'List' and the resource 'VMs', and mentions optional filters, which aligns with the schema. However, it does not differentiate from sibling tools that list specific sub-resources (e.g., list_vm_disks) or similar list operations.

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 is provided on when to use this tool versus alternatives like get_vm or list_hosts. The description does not specify prerequisites, context, or exclusions, leaving the agent without direction.

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

TDQS

B3/5.0
Disambiguation4/5

Most tools target distinct resources with clear prefixes (get_ vs list_), though the cluster CPU/memory tools have overlapping scopes (rollups, periods, windows) that could cause confusion despite different time dimensions.

Naming Consistency5/5

All tools follow a consistent verb_noun pattern (get_<resource>, list_<resources>), using snake_case throughout. Suffixes like _ws are used uniformly for web services endpoints, maintaining predictability.

Tool Count4/5

33 tools is slightly above the typical range for a focused server, but the vSphere domain has many resource types, making the count justifiable. Each tool appears necessary for comprehensive inventory coverage.

Completeness3/5

The tool set is entirely read-only (get/list), lacking any create, update, or delete operations. For an inventory or monitoring server this may be complete, but for full vCenter management, significant lifecycle operations are missing.

Maintenance

ActivityInactive
ResponsivenessSyncing

Resources

Unclaimed servers have limited discoverability.

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If you are the server author, to access and configure the admin panel.

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