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

With readOnlyHint=false declared, the agent knows this is a write operation; the description adds material behavioral context beyond annotations: notification cadence (3x/day), the fact that notify_url/notify_email are configured elsewhere, and the quota rule (1 INN = 1 daily request). It stops short of describing reversibility, duplicate handling, or return payload.

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?

Front-loaded with the purpose and event list, then a second sentence carrying operational facts (notifications, quota). Dense and informative, though the long enumeration of event types and the parenthetical config note make it heavier than strictly necessary.

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 write tool with no output schema, the description covers purpose, tracked events, notification delivery, the config sibling, and the quota cost — enough to invoke it correctly. The main remaining gap is what the subscription returns or how failures/duplicates behave.

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 100%, so the schema already documents all three parameters (including the event and xml_tags value lists). The description adds no syntax or format detail beyond the schema, so the baseline 3 is appropriate.

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?

States a specific verb ('Подписаться на мониторинг') plus the exact resource and enumerates the concrete event classes tracked (EGRUL/EGRIP extract changes, financial statements, FSSP proceedings, tax debts, etc.). It also names the configuration sibling monitoring_set_notify, so an agent can distinguish it from monitoring_list/unsubscribe without opening a schema.

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?

Implies the when-to-use context (ongoing change tracking) and explicitly routes notification setup to monitoring_set_notify, which is a useful alternative pointer. It does not state when to prefer this over monitoring_list or how it relates to monitoring_unsubscribe, so it stops short of full when/when-not guidance.

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