volume_list

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

With no annotations provided, the description carries the full burden of disclosing behavior. It indicates a read-only list operation, but offers no additional details about authentication requirements, pagination, ordering, or the shape of the response. This is adequate for a simple list but lacks depth.

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 a single, clear, front-loaded sentence with no wasted words. It effectively conveys the core functionality in minimal space.

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 a simple list tool with one optional parameter and no output schema, the description is reasonably complete. However, it does not indicate what fields are returned for each volume (e.g., IDs, sizes, names), which could be ambiguous without an output schema. The absence of any caveats or return format details leaves a gap.

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 coverage is 100% with the region parameter described as 'Region name to filter by'. The description repeats this with 'optionally filtered by region', adding little beyond the schema. The optionality is communicated, but no additional nuance is provided.

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 clearly states a specific action (List) and resource (block storage volumes), with an optional region filter. It effectively distinguishes itself from siblings like volume_info (which likely retrieves details for a single volume) and volume_snapshot_list (which lists snapshots rather than volumes).

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 notes the region filter, implying when to use it (e.g., to narrow results by region), but provides no explicit guidance on when to use this tool versus alternatives like volume_info or volume_snapshot_list. Usage is inferred from the tool's name and sibling context rather than explicitly stated.

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