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

The description reveals it fills fields and optionally submits, but misses behavioral details like whether it clears fields first, waits for elements, or handles hidden inputs. Annotations indicate a write operation (readOnlyHint=false), consistent with the description.

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, clear sentence that efficiently conveys the tool's purpose and input format with 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 tool's complexity (form filling with optional submit) and lack of output schema, the description is minimal. It omits details like what happens after submit (e.g., navigation) and how the submit button is targeted. It is adequate for basic use but incomplete for advanced scenarios.

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?

The description clarifies that 'fields' should be an array of objects with 'selector' and 'value' properties, which the schema (with empty properties) does not specify. This adds significant meaning. However, it does not specify the expected types (e.g., strings).

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's function: filling multiple form fields from a list of {selector, value} with optional submission. It distinguishes itself from sibling tools like playwright__type_text (single field) and playwright__click (clicking).

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 use for filling multiple fields but provides no explicit guidance on when to prefer this tool over alternatives (e.g., playwright__type_text for single fields) or when not to use it (e.g., dynamic fields).

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