fill_form

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

With no annotations provided, the description bears the full burden of behavioral disclosure. It only states 'Fill a form field with a value', which does not reveal effects like whether fields are appended or replaced, what happens if form_selector is omitted, or if the submit parameter triggers a navigation. This is insufficient for a safe mutation 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 a single sentence, which is concise but lacks structure. It front-loads the core action but omits critical details that would make the conciseness effective. Every word earns its place, but the content is too sparse to be maximally useful.

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 three parameters (including a nested object), no output schema, and no annotations, the description is severely incomplete. It does not explain how to specify multiple fields, how the form_selector is used, or what the return value is. The agent cannot use this tool reliably without additional documentation.

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 0%, and the description provides no parameter details. It does not explain the structure of the 'fields' object (e.g., keys as field names, values as inputs), the role of 'form_selector', or the behavior of 'submit'. The agent receives zero semantic help beyond parameter names.

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 the verb 'Fill' and the resource 'form field', indicating the tool's purpose. However, it is vague about handling multiple fields via the 'fields' object and does not distinguish it from sibling tools like 'select_option' or 'click', which also interact with form elements. A more specific description would improve clarity.

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 over alternatives such as 'click' for submitting or 'select_option' for dropdowns. The description does not mention prerequisites (e.g., needing a form selector) or appropriate contexts, leaving the agent without clear decision criteria.

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