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

Annotations already declare readOnlyHint=true, openWorldHint=false, and destructiveHint=false, so the safety profile is covered. The description adds genuine behavioral value by disclosing the return contents, including the metrics and the stats_url live dashboard the user can open, which the annotations cannot convey.

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 short sentences, front-loaded with the core purpose followed by the return-value highlight; the stats_url mention is a concrete, useful addition. No filler or redundancy.

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?

An output schema exists, so return values need not be explained, yet the description helpfully summarizes them. All required-parameter provenance is covered, leaving little missing for a read-only stats tool; only the absence of any pagination/time-window guidance holds it back from 5.

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%, so both required parameters (id, key) are already documented in the schema, including their provenance. The description adds no additional parameter meaning, format, or constraints, 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 a specific verb and resource ('See who opened one of your links') and enumerates the exact metrics returned (views, visitors, countries, devices, referrers, agent reads). This scope clearly separates it from siblings like create_upload_link, delete_link, and list_files, so an agent can identify it without opening the schema.

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?

Usage is implied by the purpose, and the description hints the id/key come 'from the tool that made the link,' but it never states when to call this versus alternatives, nor any prerequisites or preconditions. Adequate-but-minimal routing guidance.

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