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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds real value beyond them by disclosing what the result contains (behavioral claims diffed into changed/added/removed buckets) and by clarifying that it is not a textual spec diff, which sets expectations about output semantics.

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 compact sentence with the core concept front-loaded. It is efficient, though the parenthetical category list and the 'as opposed to' clause make it slightly denser than necessary given nothing is said about inputs.

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 sketches the return categories (changed/added/removed claims), which partly compensates. But for a 3-parameter tool with low schema coverage and a similarly named sibling (get_divergences), the definition leaves input semantics and sibling selection unexplained.

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 only 33%: only 'tool' is documented, while from_version and to_version are bare integers with no explanation. The description never mentions the parameters at all, so it does not compensate for the gap — it fails to say whether versions are numeric IDs, how to obtain them, or what happens with invalid/reversed ranges.

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 specific verb and resource: it diffs verified behavior claims between two spec versions and enumerates the claim categories (changed, added, removed). It also distinguishes itself from a raw spec-text diff, which is a useful contrast, though it never names a sibling like get_divergences or list_versions.

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 the phrase 'between two spec versions,' so an agent can infer this is the second-step tool after learning version identifiers. However, there is no explicit when-to-use statement, no prerequisites (e.g. do the versions need to exist / be discovered via list_versions first), and no routing to alternatives such as get_divergences or search_claims.

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