traffic_estimate

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

Annotations cover the safety profile (idempotent, non-destructive, open-world), and the description adds value beyond them: the 10-domain batching limit, the return shape (domains, not_found), and the sandbox behavior returning dummy data with no payment. Cost/payment implications are hinted at ('no payment' in sandbox) but credit consumption in production is never stated outright.

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 short sentences with zero waste: purpose and batch limit first, return shape second, environment caveat last. Front-loaded and appropriately sized for a three-parameter tool.

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 paid third-party API wrapper, the description covers scope, batch limit, response keys, and sandbox behavior — enough to call it correctly, with the full parameter detail carried by the schema. The remaining gap is what a production call costs or how long bulk estimation takes, which an agent budgeting requests would want.

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%, so domains, language_code, and location_code are already fully documented with examples, defaults, and validation rules. The description's only parameter-adjacent contribution is the 10-domain cap, which merely restates maxItems; it adds nothing about language_code or location_code semantics. Baseline 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/resource combination — estimated monthly organic and paid Google traffic for up to 10 domains — and names the upstream data source (DataForSEO Labs Bulk Traffic Estimation). It is clearly distinguishable from siblings like keyword_metrics or domain_overview by the traffic-estimation framing, though it never explicitly contrasts itself with those tools.

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 'up to 10 domains in one call' phrasing implies this is the bulk path, and the sandbox note tells the agent what to expect in development. But there is no explicit when-to-use framing, no mention of what to use instead for single-domain traffic or for other metrics, and no prerequisites stated.

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