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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds the useful detail that the result is 'returned as a file', but says nothing about format, size, or whether a job_id with no prepared pack errors out.

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?

A single front-loaded sentence with no filler; the resource and its origin are stated immediately and every clause 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?

With no output schema, the description should explain the return shape, and 'returned as a file' is only partial — it does not say whether that is a URL, bytes, or an attachment. For a two-parameter read tool with annotations, this is adequate but leaves a real gap.

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 carry the burden. It loosely maps both parameters ('for one job' implies job_id, 'CV or cover letter' implies the document enum) but omits the enum values, the cv default, and the required/optional distinction.

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 resource (the tailored CV or cover letter PDF) and names the producing tool, prepare_external_application, which separates it from get_my_cv_pdf and get_sent_cv_pdf. It stops short of explicitly contrasting those siblings, so it falls just short of a 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?

Usage is only implied via the reference to prepare_external_application, suggesting this fetches that tool's output. There is no explicit when-to-use, no when-not guidance, and no naming of the sibling PDF tools the agent might otherwise pick.

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