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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and a closed world. Beyond those, the description usefully explains that marking items does not mutate server state but is encoded into a returned URL on drxinfra.ru/upgrade-checklist.html, which removes the apparent conflict between 'marks done items' and readOnly. It still does not say whether the checklist content itself is returned or only the link.

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, tightly front-loaded with the resource and the phase span before the optional marking behavior. The enumeration of phases is dense but every clause tells the agent what content to expect.

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?

With no output schema, the description carries the burden of describing returns, and it only covers the link — whether the 44 items and their text are returned (and in what shape) is left unstated. For a zero-required-parameter, five-parameter read tool it is otherwise adequate.

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% and each field is already documented ('Numbers of the items already done', '0 = all', 'for the link'). The description reinforces that done marks and version/window values are folded into the link rather than altering stored data, but adds no format or constraint detail beyond the schema.

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 concrete resource (a 44-item, 7-phase Directum RX upgrade checklist from drxinfra.ru) and its scope, so an agent can tell it apart from the site/article siblings. It never states the operation as a verb, though — 'returns a link' is mentioned only as a side effect, leaving what the primary call yields implicit.

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 content (upgrade planning, rollback preparation, rehearsal, cutover, post-window checks), and no alternative or sibling is named or excluded. There is no explicit 'use this when' statement, so routing relies on inference from the phase list.

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