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

Annotations already flag this as a non-read-only, destructive write, and the description adds real context the annotations can't convey: the link 'holds no secret,' it 'replaces any link they had before' (explaining exactly what the destructive hint means), and it works 'even if you forget the line.' It doesn't say whether the link is shown only once or what the response looks like, leaving a small 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 sentences, front-loaded with what the link is for and followed by when to use it. The phrasing is slightly conversational ('for your human,' 'It holds no secret'), but every clause carries useful information about safety, replacement behavior, and triggering conditions.

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-optional-parameter tool with no output schema and annotations covering the safety profile, the description covers purpose, safety semantics, replacement behavior, and triggering conditions. Only the shape of the returned link and whether it is retrievable later is left implicit.

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 sole 'secret' parameter is already fully documented, including provenance from get_line and the warning not to repeat it. The description still contributes by implying the secret is optional ('even if you forget the line'), which reinforces the zero-required-parameter design. That is a modest but genuine value-add over the schema.

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 makes clear this produces a fresh management link for the human's directory listing and that it replaces any prior link. It implicitly distinguishes itself from alerts_link/routine_link by scoping the link to the directory listing, though it never names those siblings explicitly. The generating action is conveyed obliquely ('A fresh link') rather than with an explicit verb, which slightly weakens it.

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 concrete when-to-use conditions: 'Use it when they ask, or when they've lost theirs.' That covers the common triggering situations well. It does not name alternatives (e.g., disconnect_link) or state when not to use it, so it stops short of full routing guidance.

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