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

With no annotations, the description carries the full burden; it usefully discloses result ordering ('newest first') and the billing model ('1 point per returned record'), which are real behavioral facts. However it says nothing about pagination behavior, auth requirements, or what an empty/no-match result looks like, so it is only partially transparent.

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 plus a short cost sentence, with no padding. Efficient, though the cost note could be structural rather than appended.

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 4-param read tool with no output schema, the description names the return fields and ordering, covering most of what an agent needs. It omits pagination semantics (20/page vs max_items) even though both parameters exist, leaving a minor gap.

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 list/company/max_items/start_page; baseline is 3. The description restates the announcements/documents enum meaning and the returned field set but adds no syntax or format 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?

States a specific verb (List) and resource (announcements Objave / document collection Zbirka isprava of one company in the Croatia Sudski registar), and enumerates the returned fields, so the agent knows exactly what it gets. It stops short of explicitly naming the sibling it contrasts with (run_hr_companies / run_hr_companies_search), which keeps it from a 5.

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 description constrains scope to 'one company' but gives no when-to-use, when-not-to-use, or alternative tool guidance. An agent cannot tell from the text whether this supersedes run_hr_companies_search or complements it.

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