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

Discloses cost ($0.01/call), free tier (20/day), and type of PDF supported. However, with no annotations, it lacks details on error handling, rate limits beyond free tier, and output format. Adequate but not comprehensive.

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?

Single sentence with core purpose followed by pricing in parentheses. Front-loaded and efficient with no unnecessary words.

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?

Minimally adequate for a simple tool: explains purpose, type, and cost. Lacks details on output, error behavior, and page limit parameter. Average completeness given 2 parameters and no 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 description coverage is 50% (only 'url' has a generic description). The description adds no information about parameters beyond the schema, failing to compensate for the low coverage especially for 'max_pages'.

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?

Clearly states verb 'Extract' and resource 'PDF URL', with qualifier 'text-based PDFs' to distinguish from scanned PDFs. Differs from sibling 'extract_content' which targets web pages.

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?

No explicit guidance on when to use this tool versus alternatives like 'extract_content'. The qualifier 'text-based PDFs' implies limitations but does not address when not to use or mention other sibling tools.

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