Annotate Isbn Google

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

With no annotations, the description carries the behavioral burden and discloses important operational traits: a small keyless quota, the GOOGLE_BOOKS_API_KEY environment variable, and HTTP 429 avoidance. It does not explicitly confirm read-only behavior, but it gives more rate-limit and auth context than typical descriptions.

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?

Two compact sentences front-load what the tool returns and then add the quota/auth caveat plus the alternative. Every sentence earns its place with no redundant restatement of the schema or title.

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?

The tool has a complete input schema, an output schema, and a clear description covering source, scope, rate-limit caveat, and alternative. An agent has enough information to select and invoke it correctly; return-value details are covered by the output schema.

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 single parameter is fully documented in the schema with ISBN-10/ISBN-13 format and hyphen allowance. The description adds only 'for one ISBN', so it does not go beyond the schema's own parameter documentation.

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 resource and source: 'Book metadata from Google Books for one ISBN.' It also names the sibling alternative (annotate_isbn_openlib), so an agent can distinguish this Google Books lookup from the OpenLibrary one 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 clearly indicates the context for using this tool and names an alternative: use annotate_isbn_openlib instead when the keyless quota is a problem. The guidance is conditional and practical, though it does not exhaustively state every when-not-to-use case beyond the quota/429 scenario.

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