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

With no annotations, the description carries the full burden of behavioral disclosure. It reveals the payment requirement (x402) but omits other important traits such as caching behavior (only hinted by the idempotency key in schema), rate limits, or failure handling. The description is too brief to be transparent.

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 extremely concise (one sentence) and front-loaded with the key paid aspect. However, it is under-specified for a tool with 5 parameters and an output schema; a slightly longer description with critical details would be more helpful.

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?

Given the tool's complexity (5 params, payment payload, output schema) and lack of annotations, the description is insufficient. It does not cover the meaning of the output, how to construct the payment object, or practical usage context, leaving the agent with gaps.

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% with clear descriptions for all parameters, so the baseline is 3. The description adds no additional parameter context beyond what the schema provides, meaning it does not enhance understanding but also does not detract.

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 description states it's a paid web search for autonomous agents, clearly indicating the tool's function and its paid nature. It distinguishes from siblings like research_pack and extract_page, which serve different purposes, but lacks detail on the specific resource or result type.

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?

No guidance is provided on when to use this tool versus alternatives. The description implies it's for paid searches but does not specify scenarios or exclusions, leaving the agent without decision rules.

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