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

Annotations already cover readOnlyHint and openWorldHint, so the safety profile is known. The description adds that data is 'credential-free public Goodreads data' and 'normalized', which is genuine behavioral context (no auth needed, pre-normalized output). It stops short of describing pagination or rate limits, but with annotations carrying the safety load this is solid.

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?

Four short sentences, field list front-loaded, alternative tool named at the end. Efficient overall, though the id/example sentence duplicates the schema and is the one mildly redundant line.

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?

An output schema exists so return values need not be explained, yet the description still summarizes the payload. With one required param and safety annotations, an agent has everything needed to call this correctly.

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% and the sole 'id' parameter is documented in the schema, including the same '153394' example. The description repeats that example rather than adding syntax or format meaning beyond it, so baseline 3 is appropriate.

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 ('Returns') plus the exact resource ('normalized Goodreads author profile') and enumerates the fields returned (bio, dates, website, genres, photo, rating stats). It also names the sibling goodreads_author_books, so an agent can distinguish it without opening either schema.

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?

It routes the agent to goodreads_author_books for listing an author's books, giving a clear alternative. However it never states the inverse condition (this tool is for the profile of a known author id) nor any exclusion, so guidance is clear but not fully explicit.

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