get_user_book

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

No annotations are provided, so the description carries the burden of behavioral disclosure. It discloses that this is a relationship read and outlines the data fields returned, but it does not explain failure behaviors such as a nonexistent book ID or unauthenticated context.

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 clear sentence, front-loaded with the resource and relationship scope, then compactly enumerates the relevant data fields. There is no wasted text.

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 that this is a straightforward read operation with one well-documented parameter and no output schema, the description captures the essential context: what object is targeted, whose relationship, and what aspect of it. It lacks edge-case behavior but remains sufficiently complete for selecting and invoking the tool.

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% documentation coverage for the single parameter, book_id, described as a Hardcover book ID. The description adds no extra meaning to the parameter beyond the schema.

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 verb and resource: it gets the authenticated user's relationship with a specific book. It names the concrete fields returned (status, rating, review, read sessions), which clearly differentiates it from siblings like get_book_by_id or get_books_read_between.

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 implicitly communicates when to use this tool: when you need the authenticated user's personal book relationship rather than book metadata. However, it gives no explicit guidance about when not to use it or which sibling tool should be chosen instead.

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