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

With no annotations, the description carries the full behavioral disclosure burden and fully delivers: it reveals the one-payment model with no second charge, multi-provider failover so a dead upstream costs a retry rather than an answer, refund-as-credit for failed searches, and DSSE-signed receipts naming the serving provider. It also states the buyer holds no provider account or API key. This is exemplary transparency for a paid tool.

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?

The description is long but information-dense and well-structured: purpose is front-loaded in the first sentence, differentiators are organized as a numbered 'three things' list, and it closes with the account/key simplification. Every sentence earns its place given the unusual payment, failover, and receipt behaviors that must be disclosed; it is only slightly marketing-toned.

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?

Despite having no output schema and no annotations, the description compensates by specifying the return shape (normalised organic results, answer box, knowledge panel, related questions), the receipt, and the failure/refund and failover behaviors. The two-step payment flow (omit signature for terms, resend to run) is already documented in the input schema, so the description need not repeat it. Nothing an agent needs to call this correctly is missing.

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 and every parameter is already documented in the schema. The description adds useful context around payment_signature's role in the payment flow and explains why provider-selection parameters were removed, but it does not add per-parameter semantics beyond what the schema provides.

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?

The opening clause 'Search the web and get the results' states a specific verb and resource, and the description enumerates the exact return shape (organic hits with title/url/snippet, answer box, knowledge panel, related questions). The web-search scope is clearly distinct from the commerce-oriented sibling tools, so an agent can tell what this tool is for without opening the schema.

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 implies when this tool fits — an agent wanting web results without holding its own provider account or API key, under a single-payment model — and contrasts the tool with 'most paid search tools.' However, it never explicitly states when to choose this over a sibling (e.g., ghost_commerce_search) or when not to use it; routing is left to inference from names and context.

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