pdf-reader

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 states the basic action but fails to cover critical aspects like error handling (e.g., invalid page numbers), performance implications (e.g., large PDFs), or output format (e.g., text extraction vs. raw data), leaving significant gaps.

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, direct sentence with no wasted words, front-loading the core functionality. It efficiently communicates the tool's purpose without unnecessary elaboration, making it easy to parse quickly.

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 complexity of a 4-parameter tool with no annotations, 0% schema coverage, and no output schema, the description is incomplete. It lacks details on parameter usage, error conditions, and return values, which are essential for an agent to invoke the tool correctly in varied contexts.

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%, so the description must compensate by explaining parameters. It mentions 'page or range of pages', hinting at 'page', 'startPage', and 'endPage', but doesn't clarify their relationships (e.g., that 'page' is for single pages, while 'startPage' and 'endPage' define ranges) or the 'path' parameter's role, failing to add sufficient meaning beyond the bare 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 clearly states the action ('Read') and resource ('a specific page or range of pages from a PDF file'), making the purpose immediately understandable. It doesn't explicitly distinguish from sibling tools like 'read_pdf' or 'search_pdf', which would be needed for a score of 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 provides no guidance on when to use this tool versus alternatives such as 'read_pdf' or 'search_pdf'. It lacks context about scenarios where reading specific pages is preferred over other operations, leaving the agent without usage direction.

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