block_storage_create

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

No annotations are present, so the description must carry the behavioral burden. It does disclose that it creates a persistent volume and describes size limits, optional block_type effects, and the presence of a context object. However, it fails to state billing/cost implications, permission requirements, idempotency, or that the created volume will initially be unattached.

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?

The description is efficiently formatted with a clear one-line purpose, then Args and Returns sections. Every sentence adds information about a parameter or result; no padding or repetition.

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?

With an output schema available, the returns summary is a bonus rather than a necessity. The main gaps are the lack of valid values for block_type and the lack of guidance about when it is required. The description is sufficient but not comprehensive enough for an agent to safely validate all invocation choices from free text alone.

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?

The input schema has 0% description coverage, but the description adds useful meaning for every schema parameter: region examples, size range (10-40000 GB), optional label recommendation, and block_type effect. It does not enumerate possible block_type values or region code options, but the coverage is robust compared to the schema alone.

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 opens with a specific verb and resource: 'Create a new block storage volume.' It is immediately distinct from siblings like block_storage_delete, block_storage_attach, and object_storage_create by naming the exact resource type and action.

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?

The description does not state when to use this tool versus alternatives, nor does it mention the follow-up lifecycle (e.g., attach to a server, then delete). It gives no guidance on when to choose block storage over object storage, and no prerequisites or exclusions.

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