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

Annotations already declare readOnlyHint=true, so the read-only safety profile is covered. The description adds a useful behavioral constraint (plan caps on lookback: Free 30 days, Pro 365) but doesn't describe return formatting, pagination, or what happens if days exceeds the plan cap, so the added behavioral context is modest.

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 with no filler: the first names the resource and payload, the second states the plan constraint. The most decision-relevant info is front-loaded.

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-optional-parameter read-only analytics tool, the description covers scope, output components, and plan limitations, which is nearly complete for selecting and invoking it. The only gap is that it doesn't specify behavior when `days` exceeds the plan cap (clamping vs error), and there is no output schema to fall back on.

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?

The lone parameter `days` is fully documented in the input schema, including bounds and default, so the schema description coverage is 100%. The description's plan-cap note complements the parameter but adds no additional syntax or format semantics, 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 pairs the verb 'Get' with the resource 'click analytics' and enumerates the payload (totals, bots, daily series, top links), so an agent immediately knows what the tool returns. The whole-account scope further separates it from the sibling link-management tools like get_link and list_links.

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 states the tool is for account-wide click analytics and notes the plan-based lookback cap, giving an agent the context needed to decide when to call it. It does not explicitly name alternatives or exclusion rules, but among the link-management siblings its purpose is unambiguous.

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