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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the safety profile is covered; the description still adds real behavior beyond them, notably the 24-hour window (files older than that will not appear) and the fact that uploads, imports and results are all included. It does not describe pagination or what happens when the window contains more than 50 files, which is the remaining gap.

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?

Two compact sentences, with the scoping constraints (24 hours, newest first, source types) front-loaded before the use case. Dense but each clause carries information; no filler.

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 values need no explanation, and annotations cover the safety profile. With only two fully documented optional parameters, the description supplies what structured fields cannot: the recency window and the intended lookup workflow. Only pagination/truncation behavior is 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 coverage is 100%, so the baseline is 3. The description reinforces that the query is a name match ('by its name') but adds no syntax, matching rules, or guidance on limit beyond what the schema already states (default 10, max 50).

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 names the resource (files on FynePDF), the scope (last 24 hours), the ordering (newest first), and the sources folded in (upload box, other uploads/imports, results). That is enough for an agent to understand that this is a recent-activity listing, though the verb is implied rather than stated and no sibling (e.g. list_library_files) is named as the contrasting scope.

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?

It gives a concrete use case with a selecting condition: find the file_id of a file the person says they uploaded, matched by name. There is no explicit when-not guidance and the near-sibling list_library_files is never mentioned, so the agent gets a positive trigger but no routing rule against the alternatives.

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