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

With no annotations, the description carries the full burden and does so well: it discloses the upstream provider (Brave Search API), a 1-hour per-query cache, a shared monthly quota with a concrete failure mode ('quota-exhausted error until the window resets'), and the paid x402 price/chain. This is exactly the operational context an agent needs before committing a paid call.

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?

Front-loads the verb, the resource, and the return shape in the first clause before moving to operational details. Dense but nearly every sentence carries distinct information; the pricing/chain fragment ('eip155:8453') could be trimmed without loss.

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 responsibly states the returned fields (title, URL, snippet per result), covers caching, quota, pricing, and provider. It omits pagination/result-count behavior and any rate limit beyond the monthly quota, which keeps it short of fully complete for a paid external API.

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 the baseline is 3. The description adds only the return-field list and the phrase 'optional country bias' — and that phrase mildly conflicts with the schema, which marks country as required. The 'count' parameter is never addressed.

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) and resource (the web) and enumerates the return shape (title, URL, snippet). It is easily distinguished from other retrieval siblings such as dev_url_reader or live_wikipedia_summary, which fetch a single known page rather than performing open-ended query 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?

Offers implied usage context ('when an agent needs to search the web'), which is directionally useful, but names no alternatives and gives no when-not condition. It does not help an agent choose between this and live_wikipedia_summary, live_hacker_news, or dev_page_verify.

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