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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds real value beyond that: the bounded change history (last 200 changes since watching started), the plan watch-limit disclosure, and the 'Free' cost signal, which is meaningful context for an agent deciding whether to call.

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; each clause (state fields, watch limits, 200 changes, Free) carries information. It is dense rather than bloated, though the parenthetical list makes it slightly long for one sentence.

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 input parameters and no output schema, the description carries the return-shape burden and does so: it names the entity, the status fields, the change window, and the cost. An agent knows enough to call it and interpret 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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; baseline 4 applies. Nothing in the text contradicts or misdescribes the empty 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?

States the specific resource (the watched companies for the organization) and enumerates what comes back: register status, debtor/VAT lists, plan watch limits, and the last 200 changes. It is unmistakably different from watch_company/unwatch_company or search_companies in substance, but it never names a sibling or explicitly distinguishes itself.

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 only implied by the content — an agent can infer this is for viewing the watchlist rather than modifying it. There is no explicit when-to-use/when-not-to-use guidance and no mention of alternatives such as search_companies or get_company for one-off lookups.

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