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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds that results carry automation/country/category/runtime facets, but says nothing about pagination defaults, result ordering, or response shape.

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?

Two compact sentences with the resource and its facets front-loaded and no wasted preamble. The trailing 'Served by r4ck (https://...)' line is attribution rather than actionable information, a minor deduction.

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 9-parameter, zero-coverage, no-output-schema list tool, the description is too thin: the agent cannot learn acceptable filter values, what 'has' and 'green' mean, or how limit/offset behave. Strong annotations partly compensate for safety but not for invocation semantics.

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 0% across 9 parameters, so the description must carry the burden. It names five filters (q, has, country, category, runtime) but gives no value semantics — notably 'has' is never explained as the automation-type filter — and leaves sort, green, limit and offset entirely undocumented.

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 names the specific resource (hosting providers) and enumerates the returned dimensions: automation types (api, cli, terraform, mcp), country, categories, runtimes. An agent can tell this is the catalog-listing entry point, though it never explicitly contrasts itself with siblings like r4ck_get_provider or r4ck_search_servers.

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 implied by 'Filter with has, country, category, runtime, q', which tells the agent how to narrow the listing. There is no explicit when-to-use versus when-to-use-an-alternative guidance, and no statement of prerequisites or exclusions.

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