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

With annotations declaring non-readOnly, non-destructive, non-idempotent, the description complements them well by disclosing link lifetimes (6 hours / 30 days), cost ('Free'), and the public-access implication ('anyone with the link can see the file until it expires'). It omits whether links can be revoked or how many can exist concurrently, which would round out the security picture.

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, zero filler, and the core behavior is front-loaded before the mode/lifetime detail. Every sentence contributes something an agent would otherwise have to guess.

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 two-parameter tool with no output schema, the description covers purpose, modes, lifetimes, cost, and access scope. The one gap is that it never says what comes back (presumably the generated URL or link object), which the missing output schema would otherwise need to cover.

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, but the description goes beyond the enum's 'link opens the file itself; showcase is a page' by attaching distinct expiry windows to each mode. That adds decision-relevant meaning the schema does not carry.

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 states a specific verb (makes a link) and a precisely scoped resource (one file of the library), plus the access condition (anyone with the link, no sign-in). No sibling tool competes for this behavior, so no differentiation is needed. An agent immediately knows this is a share-link generator, not a file lister or content creator.

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 effectively routes the choice between the two modes by giving the durability of each ('a link lasts 6 hours; a showcase page ... lasts 30 days'), which is exactly the tradeoff an agent needs to pick 'link' vs 'showcase'. It stops short of an explicit 'use this when...' clause or prerequisites for calling it.

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