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

Annotations only provide basic safety hints, so the description adds value by explaining that the tool embeds fonts and color information and fails honestly rather than returning a non-conformant PDF/A. This is a useful behavioral guarantee beyond the structured fields and does not contradict the annotations.

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 four sentences and front-loaded with the purpose and target standard. The Ghostscript note and honest-failure behavior add useful context, though the title-like first phrase is slightly redundant with the description opener.

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?

For a one-parameter conversion tool with no output schema, the description covers purpose, target standard, use case, implementation, and failure behavior. It does not detail how the output file is returned, but that is a minor gap given the simplicity of the operation and the absence of an 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?

The schema description coverage is 100% for the single file parameter, so the schema already documents it adequately. The description does not add parameter-level details beyond the schema, so the baseline score of 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 opens with a specific verb and resource: "Convert a PDF to PDF/A-2b," the ISO archival profile. It clearly distinguishes this from sibling PDF tools by naming the exact target standard, the archival context, and the Ghostscript implementation.

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 gives clear when-to-use context: "required for long-term storage and by many legal, government and enterprise records systems." It does not explicitly name alternative tools or exclusions, stopping short of full routing guidance, but the use case is unambiguous.

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