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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds no further behavioral details such as return format, error handling, or pagination. It meets the baseline for a read operation but does not enrich beyond 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 sentence that is front-loaded with the verb and resource, and it contains no filler or redundant phrasing. Every word contributes to the meaning.

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, single-item read tool, the description plus the comprehensive schema and annotations cover the essential aspects. The lack of output schema and return-value description is mitigated by the simplicity of the operation and the clarity of 'content library item'. Some detail about what fields are returned would be useful, but the gap is minor.

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 100%, with each parameter including a description. The tool description's 'by ID' repeats the id parameter schema and adds no new semantic meaning; the team_id scope is already documented in the schema. 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?

The description 'Get a specific content library item by ID' uses a clear verb (Get), identifies the resource (content library item), and specifies the lookup key (ID). It clearly distinguishes the tool from listing (list_library) and mutating siblings (create/update/delete_library_item).

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 implies targeted retrieval by ID, and the team_id parameter explicitly instructs to use list_teams to obtain team IDs. However, it does not explicitly state when to prefer this over list_library or other alternatives, so it falls short of full alternative guidance.

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