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

Annotations already cover safety and idempotency, but the description adds non-obvious behavior: every keyword must match (AND, not OR), return payload shape (IDs, titles, canonical URLs) and the handoff to fetch. It does not state a result cap or ordering, which keeps it short of a 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?

Four sentences, all load-bearing, with the core function front-loaded and the sibling routing placed after it. The empty-results sentence is slightly indirect but earns its place by preventing a misinterpretation an agent would otherwise make.

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 single-parameter, read-only search tool with an output schema, this covers call semantics, matching behavior, and the sibling boundary. Missing only ordering/limits, which the output schema may partly imply.

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 query field already documents keyword content with an example, so the description largely repeats it. The one addition, the AND-matching rule, is genuinely useful semantics the schema does not express, but it is not parameter-level detail beyond that.

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 and scoped resource (finds PadelTrue catalogue documents) and enumerates the keyword domain (brand, model, year, shape). It distinguishes itself from search_rackets, which is explicitly named as the home of budget/style filters.

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?

Explicitly routes budget and playing-characteristic filtering to search_rackets, describes the AND-match semantics, and warns that empty results are a catalogue-scope outcome rather than a market claim. That is when-to-use, when-not-to-use, and an expectation-setting caveat in four sentences.

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