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

No annotations exist, so the description carries the full load. It usefully discloses the data source (CanadaBuys), that results are limited to 3, and the sort order (newest publication date) — meaningful behavior beyond the schema. It omits matching semantics (substring vs exact), whether results are cached, and any rate/access constraints behind 'FREE'.

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?

One sentence, front-loaded with the distinguishing 'FREE' and the result cap and ordering. No filler whatsoever.

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 simple one-parameter search with no annotations or output schema, the description covers source, result count, and ranking. It stops short of describing what a returned tender looks like or what happens on zero matches, which leaves the agent guessing about the response shape.

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?

With 0% schema description coverage, the description must compensate. It tells the agent the parameter is a keyword used for matching, which is the parameter's whole role, but adds nothing about matching behavior (case sensitivity, phrase handling, multiple words). Marginal compensation for a single obvious parameter.

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 (searches) and a specific resource (open federal tenders on CanadaBuys) filtered by keyword. The 'top 3 by newest publication date' clause implicitly distinguishes it from the sibling tender_search_full, though it never names the alternative.

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 'FREE' marker and the 'top 3' cap imply this is a quick/cheap lookup and that tender_search_full covers the broader case, but neither the when-to-use nor the when-not-to-use is stated explicitly. The agent must infer the routing from the sibling name and the result cap.

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