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

With no annotations, the description carries the full behavioral burden. It usefully discloses the branching output behavior (single page returns JPG, multiple pages return a ZIP), which is real value beyond the schema, but says nothing about size/page limits, error behavior, or that file_url must be publicly reachable.

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?

Three tight lines with zero filler, front-loaded with the core conversion statement before the per-parameter notes. Every sentence earns its place.

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?

An output schema exists, so return-value detail is not required, yet the description still clarifies the JPG-vs-ZIP artifact. For a simple two-parameter, one-required tool this is nearly complete, with only error/limit behavior and auth requirements unaddressed.

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, and it does: file_url is explained as a public document URL (an important constraint) and dpi is given its valid values (72/150/300) plus the default. Both parameters are covered, though no format guidance for the URL itself.

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?

States a specific verb (converts) and resource (Word documents: DOC, DOCX, ODT, RTF) plus the output (JPG images). An agent can immediately distinguish this from word_to_pdf or pdf_to_jpg without opening the 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?

Format inputs are listed, so the applicable use case is implied, but there is no explicit when-to-use vs. siblings such as word_to_pdf or pdf_to_jpg, and no prerequisites or exclusions. Usage is inferred rather than stated.

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