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

Annotations already declare read-only/idempotent/non-destructive, and the description adds genuinely non-obvious behavior: the result set is scoped to servers the caller can reach, and raw url links fail without an authenticated Termalin session even for the owner. It does not cover pagination, result limits, or what an empty response means.

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 sentences, front-loaded with the resource and its fields, then the practical instruction about open_url. The opening field enumeration is dense and slightly list-like, but every clause carries information.

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?

No output schema exists, and the description compensates by naming each returned field and explaining the open_url vs url distinction, which is the main thing an agent could get wrong. Missing only operational detail such as ordering, pagination, or behavior when no sites exist.

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?

Zero parameters, so there is nothing for the description to disambiguate; baseline is 4. The description instead spends its words on return-field semantics (who added the link, share count), which is a reasonable use of the space.

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?

It names the specific resource (internal sites in the owner's Termalin cabinet, restricted to reachable servers) and enumerates the returned fields, so an agent knows exactly what comes back. The listing verb is only implied by the phrasing and the annotation title rather than stated in the description, and siblings like web_link_create/web_link_delete are not referenced.

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 downstream usage advice — hand the user open_url rather than url — but never states when to call this versus web_link_create/web_link_delete, nor any prerequisites or exclusions. Usage is implied by the tool name and the field list rather than spelled out.

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