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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds real context beyond that: the sort order ('most recent first'), the returned fields, and the underlying GET endpoint. Pagination mechanics are left to the schema rather than described, which keeps it at a 4.

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 short sentences, each carrying distinct information: what is listed, the returned fields and order, the downstream use, and the endpoint. Nothing is redundant and the core purpose is front-loaded.

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 usefully compensates by naming the returned fields and ordering. For a read-only, zero-required-parameter list tool this is nearly complete; only pagination behavior and any result-size caveats are omitted.

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 100%, so the offset, document_class and number_of_documents parameters are already fully documented. The description adds nothing about filtering or page size semantics, which is the correct baseline 3 when the schema does the work.

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 and resource ('List the documents uploaded to the account') and even enumerates the returned fields (id, name, class, pages). This clearly distinguishes it from the other list_* siblings such as click2mail_list_jobs_by_app_signature and click2mail_list_return_addresses.

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?

'Use a document id when creating a job' gives a concrete downstream use that routes the agent toward click2mail_create_job. There are no explicit when-not conditions or named alternative list tools, so it falls just short of a 5.

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