page_diff

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

With no annotations, the description carries the full burden. It honestly discloses the core behavior: comparing cached vs. fresh content. It does not mention whether the tool updates the cache, performs a network fetch, or describes error/rate-limit behavior, but the primary behavioral pattern is clear.

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?

The description is short and front-loaded with the core concept. The parenthetical 'кэш vs свежее' and 'Паттерн change detection' are somewhat redundant but do not bloat the text.

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 two-param diff tool, the core semantics are conveyed. However, since there is no output schema, the description could usefully state the result format, what part of the page is compared, and how max_chars affects the response.

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%, so the description must compensate, but it does not mention the url parameter or the max_chars truncation limit. The parameter names are reasonably self-explanatory, yet no added meaning or edge-case guidance is provided.

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 clearly identifies that the tool compares a page's cached reading against freshly retrieved content and describes it as change detection. It is distinct from sibling fetch/crawl tools, though it is phrased as a noun rather than an explicit verb such as 'get' or 'compute.'

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?

The phrase 'мониторинг изменений, что поменялось' implies this tool is intended for monitoring page changes over time. However, it does not explicitly state when to prefer this tool over alternatives like fetch_page, snapshot, or table_extract, and gives no exclusion conditions.

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