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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds real value beyond that: result ordering (newest first) and the identity of each entry (fingerprint hash + id usable downstream). No pagination or size limits are mentioned.

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 sentences, no filler, and the most useful facts (what is listed, ordering, entry identity) come first, with the downstream linkage last.

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?

There is no output schema, so the description correctly carries the burden of describing the return shape: version entries with ids and spec hashes, ordered newest first. It omits any statement about result volume or truncation, which is the only meaningful gap for a small listing tool.

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 a single required 'tool' parameter whose description already gives examples (tool name, host, or URL). The description adds only the scoping notion of 'one API', which the schema's parameter description already conveys in substance; 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 and resource ('spec versions recorded for one API') and adds distinguishing behavior ('newest first, each fingerprinted by its spec hash'). It also explicitly connects to the sibling get_version_diff, so an agent can separate it from list_tools, get_divergences, etc. without opening schemas.

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 second sentence tells the agent what to do with the result ('The ids identify versions for get_version_diff'), which is clear usage context linking to a sibling. It stops short of explicit when-not-to-use guidance (e.g. when to prefer get_divergences instead).

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