hcloud_list_rds_datastores

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

Annotations already declare readOnlyHint=true, idempotentHint=true and openWorldHint=true, so the safety profile needs no restating. The description adds nothing beyond that baseline: it doesn't say the result is region-scoped, whether the list is exhaustive, or that results depend on the engine named in database_name.

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?

A single short, front-loaded sentence with zero filler. Nothing redundant or padded; the only criticism is that it is too sparse rather than too long.

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 two-parameter, read-only list tool with full schema coverage and complete annotations, this is adequate but thin. It omits which cloud the RDS service belongs to and how it relates to the other RDS listing siblings, leaving the agent to infer the surrounding workflow.

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%, and the schema itself already defines 'region' and 'database_name' (including the engine enum values), so the baseline applies. The description adds no extra meaning such as accepted region formats or whether database_name is case-sensitive or filter-only.

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 gives a clear verb and resource ('List ... RDS DB engine versions') and usefully disambiguates the opaque tool name 'datastores' into 'engine versions', which separates it from siblings like hcloud_list_rds_flavors and hcloud_list_rds_storage_types. It doesn't explicitly name those siblings, so it stops short of full differentiation.

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?

Usage is only implied: an agent can infer this is for discovering valid engine versions before provisioning an RDS instance. There is no explicit when-to-use/when-not, no mention of the region scoping, and no pointer to hcloud_list_rds_flavors or hcloud_list_gaussdb_datastores as related lookups.

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