nex_captcha_product_schema

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

Annotations only declare readOnlyHint=true; the description adds that the call is free, that examples are placeholders rather than literal data, that schema constraints must be preserved, and that certain workflow types depend on external prerequisites. These are material behavioral caveats an agent cannot infer from the annotation.

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?

Dense but front-loaded: identity and return contents come first, then the placeholder warning, then workflow branching and the paid-task blocker. Every clause carries information, though the final two sentences are compressed into run-on form and could be split for readability.

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 enumerates what is returned (adapter schema, example, integration/result contract, workflowGuide) and flags that example values are placeholders. Combined with the workflow prerequisite notes, an agent has everything needed to call it and interpret the result.

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 0% with a single bare string productCode, so the description carries the load: it names the authoritative source of valid values, specifies exact-match semantics, and rules out aliases or fallback resolution. It stops short of format/token examples, leaving a small gap.

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 and resource: read the online adapter schema, example, integration/result contract and workflowGuide for a single productCode. It anchors the input to a named sibling (nex_captcha_product_list) and is clearly distinguishable from action siblings like nex_captcha_buy or nex_captcha_query.

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?

Explicitly constrains usage: exact match only, no aliases, no offline fallback, and productCode must come from nex_captcha_product_list. It also routes onward by workflow type (HTTP_SUBMIT vs browser workflows vs page CAPTCHAs starting at nex_browser_captcha_prepare) and names the DOCUMENTATION_REQUIRED blocker for paid tasks.

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