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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safe-read profile is covered. The description adds what a caller gets back (name, size, state, attachment, encryption, snapshots), which is useful, but it discloses nothing about pagination behavior, defaults, or rate limits.

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?

Compact and front-loaded: the resource and its per-zone scope lead, then the returned fields. The trailing 'GET /block-storage.' restates the obvious from the tool name and is mild filler.

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 no output schema, the description helpfully lists the fields returned and the zone scope, which is enough for a simple list tool whose parameters and safety profile are already covered by schema and annotations. Only pagination semantics and sibling routing are absent.

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 all four parameters (zone, limit, offset, instance_id) are fully documented in the schema, including defaults and the next_offset pattern. The description only restates the zone scoping and adds nothing about the other parameters, so the baseline 3 applies.

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?

States a specific verb ('List') and resource ('block storage volumes'), scoped to a zone, and enumerates the returned fields. It is clearly distinct from the singular exoscale_get_block_storage_volume, though the description never names that sibling explicitly, leaving differentiation to the natural read of the verb.

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, no statement of when this is preferable to exoscale_get_block_storage_volume, and no mention of prerequisites or pagination intent. The zone scoping is stated but purely as a fact, not as usage direction.

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