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

With no annotations provided, the description carries the burden and discloses important behavior: it returns the most recent 100 historical filings ordered by date. It also warns never to invent MBS numbers or historical events, which is a meaningful data-integrity constraint. It does not mention permissions, rate limits, or behavior when the company is not found, so it falls short of full transparency.

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 three tight sentences with no filler. Purpose is front-loaded, and the operational rules are separated clearly at the end. Every sentence contributes either scope, return behavior, or a usage constraint.

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 one-parameter read tool with no annotations or output schema, the description is complete enough: it defines the source registry, the resource, the ordering, and the 100-record limit. An agent has what it needs to call the tool correctly and knows not to fabricate the MBS. The only minor gap is lack of sibling routing, which is more a usage-guidelines concern.

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 the single mbs parameter is documented in the schema. The description adds value by expanding MBS as Court Register Number and tying it to a specific Croatian company in the Sudski Registar. The rule to ask the user for the MBS rather than invent one further clarifies how the parameter must be sourced.

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 states a specific verb and resource: retrieve the chronological timeline of official legal and corporate changes from the Sudski Registar for a company identified by MBS. It clearly scopes the tool to historical filings, which distinguishes it from financial or ownership siblings by domain. However, it does not explicitly name or differentiate itself from siblings such as get_company_overview or get_company_by_id.

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 purpose: use this tool when historical legal/corporate changes are needed. The rule to ask the user for the MBS first gives a prerequisite but not a comparison to alternatives. There is no explicit guidance on when to choose this over get_company_overview or search_companies.

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