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

Annotations already declare readOnly, idempotent, non-destructive and closed-world. The description adds real context beyond them: it returns closed offers rather than erroring, and it flags the closed state, which an agent could not infer from the annotations. The linking instruction is presentational rather than behavioral, so it isn't a full 5.

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?

Three sentences, all front-loaded around what comes back before the presentation tip. The quoted field names ("url", "official_url") are slightly clunky but every sentence carries information.

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?

An output schema exists, so return values need not be spelled out; the description nonetheless frames the payload and, more importantly, covers the closed-offer edge case that the schema and annotations cannot express. Nothing needed to invoke it correctly is missing.

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 'reference' parameter is thoroughly documented in the schema, including an example format and the alternative URL form. The description adds no parameter-level detail, so the baseline 3 applies.

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 resource (a single vacancy/open call) and enumerates the payload it returns: department, domains, attached files, notice text. It is distinguishable from list_vacancies by the singular framing, but it never names the sibling tools, so differentiation is inferred rather than stated.

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?

It gives one useful usage signal — it works for closed offers and reports the closed status — plus presentation guidance for linking. However, it never says when to pick this over list_vacancies or get_competition, so routing guidance is only implied.

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