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

Annotations already declare readOnlyHint=true, so the safety profile is covered; the description earns extra credit by disclosing what is returned (name, provider, region, provider-side bucket name, endpoint, status, error excerpt) and the security-relevant guarantee that key material is never returned. It still says nothing about pagination or ordering, so not a 5.

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 sentence, front-loaded with the scope constraint and the identity of the buckets, with the returned-field list and safety note as compact trailing clauses. No 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 usefully enumerates the returned fields and the key-material exclusion, and annotations cover read-only status. The only residual gap is result-set behaviour (pagination/limits) for an org-wide listing, which is unaddressed.

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 tool takes zero parameters, so the schema carries no semantics for the description to mirror; baseline 4 applies. Nothing in the description misrepresents or undercuts the empty parameter set.

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 (object storage buckets), and narrows scope to 'the organisation's ... buckets Ankra created on its provider credentials'. That scoping separates it cleanly from the sibling get_object_storage_bucket and from create/delete_object_storage_bucket.

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 'twin of `ankra bucket list`' parenthetical implies a read-oriented listing job, and the read-only framing makes the mode clear. But there is no explicit when-to-use guidance relative to get_object_storage_bucket (single bucket) or the create/delete siblings, so the agent must infer the choice.

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