bookshelf_update_book

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

The annotations already indicate readOnlyHint=false, so the description's 'WRITE: this modifies your Bookshelf instance' adds little beyond what is structured. It does not disclose what fields are updated, whether the body is merged or replaced, or any prerequisites, so it provides minimal additional transparency.

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 concise at two short sentences, but 'Update book' largely restates the tool name. The second sentence adds a side-effect warning, yet the overall text is so minimal that it feels under-specified rather than efficiently crafted.

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?

Despite having an output schema, the description omits essential context: what the body object should contain, how the update behaves, and when this tool should be selected over related update tools. The tool's complexity (nested body object, arbitrary properties) is not addressed, leaving the description incomplete.

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 0%, and the description provides no explanation of the 'id' or 'body' parameters. The agent is left to guess the meaning of 'body' (an arbitrary object with additionalProperties), so the description fails to compensate for the missing schema details.

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 'Update book', giving a clear verb and resource. It is distinguishable from siblings like create_book and delete_book, though it does not explicitly distinguish from bulk_update_book or update_books_monitored, so it falls short of a 5.

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 gives no guidance on when to use this tool versus alternatives. 'WRITE: this modifies your Bookshelf instance' is a warning about side effects, not usage context, and no exclusions or alternative tools are mentioned.

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