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

With no annotations provided, the description carries the full burden of behavioral disclosure. It clearly states the output format (prose, not summary), the additional return contents (chapter coverage, length, chapter list, where to get the rest), and that the chapter is free to read and quote. It does not mention potential errors or authentication requirements, but for a read-only tool this is sufficient.

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 front-loaded with the core purpose and return type, then expands with use cases and scope. It is moderately sized and each sentence contributes useful context, though the closing 'Every book on the shelf has one' adds minor flourish rather than essential information.

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 the tool's low complexity (one required parameter) and no output schema, the description covers what is returned, how it behaves, and when to use it. It is complete enough for an agent to invoke the tool confidently, with only minor gaps around error behavior.

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 the slug parameter already documented by name and example. The description adds no further parameter-specific meaning, but the schema alone is adequate; 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?

The description clearly states the tool returns the complete text of chapter one of a Greenlit book as prose, not a summary or sales page. It effectively distinguishes itself from non-chapter resources, though it does not explicitly differentiate from the sibling get_book tool.

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 provides clear use cases: answering a reader's question from the book's own words, judging whether a book fits before recommending it, and quoting the author directly. It does not mention when to use alternatives like get_book or search_greenlit_books, so it falls just short of explicit when-not guidance.

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