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

Annotations already declare readOnly/idempotent/non-destructive, so the description's job is to add beyond that — and it does, by naming the three returned fields (destination, clicks, last click), which is the main unknown for a read tool with no output schema. "Free" hints at no credit/cost consumption, though it is left unexplained.

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?

Extremely tight and front-loaded — one sentence that lists the payload. The telegraphic style and the dangling "Free." cost a little clarity, but nothing is padded.

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 single-param read tool the description covers the essentials (input is a code, output is destination/clicks/last click). It leaves out what happens on an unknown code and whether clicks are total or unique, gaps that matter because there is no output schema.

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?

Only one parameter, and the schema already documents it fully at 100% coverage ("The code after cncto.co/, e.g. 'x7Kp2Qa'"). The description adds no additional meaning about the code, so 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?

States the resource and cardinality precisely ("One short link") and enumerates what comes back: destination, click count, last click time. The singular framing implicitly distinguishes it from links_list and links_shorten, though the verb itself is only carried by the name/title.

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?

There is no explicit statement of when to call this versus links_list, links_update or analytics_view_link, nor any prerequisite (e.g. that a code must already exist). The only guidance is the implicit singular-vs-plural distinction.

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