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

Annotations already declare readOnlyHint/idempotentHint/openWorldHint=false, and the description adds genuinely new behavior: ranked-by-relevance output, the exact competition fields returned, and the cross-language matching rule (English queries match all EU languages, local-language terms improve recall). It does not cover no-match/empty-result behavior or pagination, which keeps it out of 5 territory.

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 compact sentences: pricing, input, output. The pricing note is front-loaded, the input example is parenthetical, and the return contract is spelled out. No sentence is filler.

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 output schema, the description carries the return-shape burden and does so (ranked tenders with named competition metrics), and annotations cover safety. Missing only edge-case behavior (no matches, result count behavior) for full completeness.

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 limit and countries are fully documented in the schema and the description adds nothing about them. It only reinforces the company_description matching hint that the schema already states, making this a baseline 3.

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 (match) and resource (company description -> open public tenders), plus the scope of matching (best match first) and the value-add payload (competition signals). It never names the obvious sibling search_tenders, so an agent cannot tell from the description alone how this differs from keyword tender search.

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 explains input style but gives no when-to-use / when-not-to-use guidance and no routing against siblings such as search_tenders or bid_intelligence. 'Free during beta' implies a cost motive for choosing it, but that is a hint, not a rule.

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