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

Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description does add value by describing the shape of the returned content (intro, sections with diagrams/interactives marked inline, Q&A, link), which is useful given there is no output schema, but it says nothing about size, truncation, or missing-article behavior.

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 front-loaded sentence with no filler; the content enumeration is dense but informative. Slightly list-heavy phrasing, yet nothing is wasted.

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 one-parameter read-only fetch with no output schema, the description covers what the tool returns and its read-only character via annotations. Only error/edge-case behavior and the slug-source link are left to the 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?

Schema coverage is 100% for the single required slug parameter, including a regex pattern and an example, so the schema already carries the semantics. The description contributes nothing beyond that, which matches the baseline 3 for fully documented parameters.

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 the specific resource (a pandawed.ru blog article) and its scope ("целиком" — in full), enumerating what it contains: intro, sections, Q&A, link. It implicitly separates itself from list/search siblings by stressing full-content retrieval, though no sibling is named and the retrieval verb is only implied by the 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 when-to-use guidance, no statement of prerequisites, and no routing to alternatives such as list_articles or search_articles (the dependency on list_articles appears only in the schema's parameter description, not in the description). An agent must infer that this is the fetch-after-list step.

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