iaas_enumerate_vsphere_regions_async

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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=true, so the safety profile is partly covered. However the description adds nothing beyond the endpoint path: it does not disclose that this is an asynchronous enumeration that reaches out to an external vSphere endpoint, nor what state is created server-side, which is the key behavior an agent needs to know for a POST enumeration call.

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

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

One front-loaded sentence plus the raw endpoint, with zero filler. It is efficient, though part of the brevity comes from omitting needed context rather than from tight editing.

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

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

For an async POST enumeration with a nested body, no output schema, and a sibling result-retrieval tool, the description is too thin: it never explains the async follow-up, the external endpoint dependency, or what the caller receives. An agent could easily call this expecting regions in the response.

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

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

Schema description coverage is 100%, so the body fields (cloudAccountId vs. hostName/username/password, dcid, certificateInfo) are already fully documented in the schema. The description only implies 'specified cloud account' and adds no insight into the either/or credential paths or the apiVersion requirement; baseline 3 is appropriate.

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

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

The description states a specific verb+resource: 'Get the available regions for specified vSphere cloud account', which pins down the provider (vSphere) and the object (regions). It doesn't explicitly distinguish itself from the many sibling enumerators (iaas_enumerate_aws_regions_async, iaas_enumerate_regions_async) or from iaas_get_regions, but the vSphere qualifier makes the target unambiguous.

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

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

There is no when-to-use guidance: nothing explains how this differs from iaas_get_regions, or when to enumerate versus list already-known regions. Critically, the tool is named '_async' and a sibling iaas_get_region_enumeration_result exists, yet the description never says results must be fetched separately or that credentials/endpoint access are prerequisites.

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