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

No annotations exist, so the description carries the full burden and does disclose genuinely non-obvious behavior: pay-per-call pricing, the USDC/Base payment rail, and that unpaid calls return a 402 challenge. It also enumerates the returned fields. It falls short of stating result caps, pagination, or rate limits, which matter for a search endpoint.

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: scope first, then return shape, then cost/payment behavior. Every sentence contributes information an agent would otherwise have to guess at.

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 search with no output schema and no annotations, the description covers source, jurisdiction, date coverage, return fields, pricing model and the failure mode on non-payment. The main omission is result-set size/pagination, which an agent needs to plan multi-step retrieval.

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?

There is a single required parameter with 100% schema coverage, though the schema text is only the word 'required', so it describes nothing meaningful. The description adds no query syntax, boolean/phrase support, or court-filter guidance, so the baseline of 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 verb (Search) against a specific resource (UK court judgments), naming the underlying source (Find Case Law, The National Archives), covered courts and the 2001-present range. The UK jurisdiction scope implicitly separates it from caselaw_us and the search/list framing separates it from caselaw_fetch.

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?

By saying it returns case names, courts, dates and links, it hints that this is the discovery step before caselaw_fetch retrieves the full judgment, but that routing is never stated explicitly. No exclusions or prerequisites (e.g., minimum query length, jurisdiction limits) are given, leaving usage to inference.

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