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

Annotations already declare that the tool is read-only, idempotent, closed-world, and non-destructive, so the safety profile is covered. The description adds that the response includes editorial notes and BD5D holdings, but it does not describe error behavior, missing-record handling, or any other behavioral trait beyond what annotations provide.

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 front-loaded sentence with no filler. It efficiently conveys the resource, included data, and identifier requirement.

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 simple read-only single-record retrieval with rich annotations and no output schema, the description covers the resource, the included data, and the identifier type. It could mention not-found behavior, but nothing essential to invoking the tool is missing.

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 0%, so the description must compensate for the single parameter. It does so by clarifying that the required 'id' is a numeric release ID, which adds semantic meaning beyond the bare integer/minimum schema and is sufficient for a one-parameter tool.

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 states a specific retrieval action ('One release') and names the included data ('editorial notes and BD5D holdings'), making the resource clear. It also contrasts implicitly with the sibling 'search_releases' by specifying retrieval by numeric release ID, though it does not explicitly name the alternative.

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 phrase 'by numeric release ID' implies the tool is used when a specific release ID is known, but it does not state when to prefer 'search_releases' or what to do when the ID is unknown. Usage is therefore implied rather than explicitly guided.

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