browser_fill

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

No annotations are provided, so the description carries the full burden. It does not disclose whether existing input is cleared, whether events are triggered, or how locator strategies interact (e.g., precedence, combination). The behavioral traits beyond 'type' are absent, making the tool's behavior opaque for an AI agent.

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, front-loaded sentence with no extraneous words. It directly states the action and hints at the key concept (locator strategies). However, it is so brief that it sacrifices clarity on parameter usage.

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 8 parameters with 0% schema description coverage and no annotations, the description is far too sparse. It does not explain how to properly use locator strategies, the expected behavior (e.g., clearing, events), or the structure of the output schema. A more complete description would include usage patterns and behavioral details.

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 adds no meaning to the 8 parameters. It mentions 'locator strategies' but does not explain the role of each parameter (css, name, role, etc.) or that exactly one locator should likely be provided. The required 'value' parameter's purpose is obvious, but the optional locators are left entirely to the schema 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 clearly states the action 'Type value into an input', using backticks for the value. It mentions 'locator strategies' which hints at the multiple element selection parameters. However, it does not explicitly differentiate from sibling tools like browser_click or browser_get_text, but the action of typing is distinct enough.

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 description implies usage for filling form inputs, but provides no explicit guidance on when to use this tool versus alternatives. No exclusions or prerequisites are mentioned, and the sibling tools are not referenced. The verb 'type' strongly suggests text input, but the lack of comparative guidance leaves some ambiguity.

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