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

No annotations are supplied, so the description carries the full behavioral burden. It does disclose one useful trait — that the allowed period is determined by the account's tariff — but says nothing about permissions, what happens if days exceeds the limit (clamping vs. error), or the shape of the response.

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?

A single compact sentence with no filler, and the scope constraint is front-loaded. Its brevity is efficient, though it borders on under-specification rather than padding.

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 two-parameter read tool with no output schema and no annotations, the description leaves the required slug and the days semantics unexplained, which is a real gap. It does at least establish that this returns view counts bounded by the plan, which is the minimum an agent needs to attempt a call.

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 0%, and the description does not compensate: 'slug' (the sole required parameter) is never mentioned, and 'days' is only obliquely hinted at via 'за период'. The agent has no idea what slug identifies or what unit or default days uses.

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 names a resource (site views) and a period scope, so the agent can tell it returns traffic statistics. However, it never mentions the required 'slug' parameter or how it differs from the analytics-flavored sibling vebhost_metrika, leaving the agent to guess which analytics tool to pick.

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 when-to-use guidance, no prerequisite for obtaining a slug, and no named alternative such as vebhost_metrika. The only context is the implicit constraint that the period is capped by the plan, which is a limitation rather than guidance on selecting this tool.

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