wavexis_fill

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

Annotations indicate destructiveHint=true, and the description says 'replaces existing content', which is consistent. However, the description does not elaborate on other behavioral aspects such as what happens if the element is not found, whether it clears before filling, or if there are side effects. The annotations already convey the destructive nature, so the description adds minimal extra value.

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 very short and front-loaded with the core action. The additional Args and Returns sections are concise. However, the docstring-style formatting (Args, Returns) is non-standard for MCP, but still clear. No wasted words.

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 complexity of the input schema with 7 parameters and destructive behavior, the description is minimal. It does not explain important aspects like the meaning of backend, headless, or session_id. The return value is described simplistically without indicating error cases or structure. The tool is not fully documented for an AI agent to use effectively.

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% (no parameter descriptions in the tool description). The description only mentions 'input: Fill parameters (selector, value)', which is vague and does not explain other parameters like url, backend, headless, session_id, wait_timeout. The schema itself has a description only for 'value', so the description fails to compensate for the lack of parameter documentation.

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 clearly states the tool fills an input element with a value and replaces existing content. It uses a specific verb and resource, but does not explicitly distinguish from sibling tools like wavexis_type or wavexis_fill_form, which could fill or type into inputs.

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. It does not mention prerequisites, contexts, or when to avoid using it. The description only states the basic action without usage context.

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