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

Annotations already declare readOnlyHint=true, so the description's main contribution is listing the returned fields. It adds useful context about what data is included, but does not disclose error/not-found behavior, date formats, or how far back 'recent click history' goes.

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?

The description is a single, tightly structured sentence: it fronts the resource ('one link') and then lists the returned details in a compact colon-separated enumeration. Every part earns its place.

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 simple read-only tool with one well-documented parameter, annotations, and sibling context, the description covers the essential return fields. It could be more precise about 'recent' history limits and date formats, but nothing critical is missing for invoking it.

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%; the input schema already defines the code parameter and its meaning. The tool description adds no additional parameter information, so the baseline 3 applies.

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 clearly identifies the resource (one link) and enumerates the returned details: destination, clicks, dates, last click, and click history. This distinguishes it from list_links (multiple links) and get_analytics (aggregate analytics), despite the verbless phrasing.

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?

The 'one link' phrasing implies use for retrieving a single link's details, which differentiates it from listing all links. However, it does not explicitly state when to prefer this tool over get_analytics or mention any exclusions, so usage guidance is implied rather than explicit.

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