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

Annotations already declare readOnlyHint, openWorldHint=false, and idempotentHint=true, establishing safety and non-mutating behavior. The description adds context about per-category change counts and the version-filtering semantics, which goes beyond the annotations. It does not contradict the annotations.

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?

The description is a single, focused sentence that front-loads the core purpose and then explains the key filtering parameter. Every part contributes meaning, with no filler or redundancy.

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?

Given the presence of a rich schema, output schema, and annotations, the description is sufficient for the tool's moderate complexity. It explains the primary action and the important since_version behavior, though it omits explicit sibling differentiation, which prevents a perfect score.

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 input schema provides 100% coverage with detailed descriptions for all three parameters, including the since_version matching rule. The description echoes the since_version purpose ('the version you run') but adds no new information beyond what the schema already states, so the baseline of 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?

The description clearly identifies the tool as providing a product's newest releases with notes, which aligns with the title 'What changed in a product'. It does not use an explicit verb like 'Get' or 'List', and it doesn't directly distinguish itself from siblings, but the resource and intent are unambiguous.

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 description explains the main usage pattern: pass since_version to filter releases shipped after a specific version. However, it doesn't provide explicit guidance on when to use this tool versus the sibling tools list_products or search_releases, nor does it mention any exclusions or alternatives.

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