向输入框输入文本

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

With no annotations provided, the description carries the full behavioral disclosure burden. It does disclose meaningful behavior: finds by CSS selector, focuses, writes text, dispatches input/change events, and supports contenteditable. It could add error-handling or waiting behavior, but the core side effects are clearly stated.

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 compact sentence with no filler. Every clause adds useful information: selector targeting, focusing, text writing, event dispatch, and contenteditable compatibility.

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?

For a focused typing tool, the description is largely complete: the targeting mechanism, action, and event behavior are all disclosed, and the schema covers parameters. It omits explicit when-to-use guidance and return/error details, but these are not critical for correct invocation.

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 input schema already documents all four parameters with 100% coverage. The description restates the CSS selector and text concepts but does not add new parameter-specific meaning beyond what the schema provides, so the baseline of 3 applies.

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 identifies the action (write text), the target (input element or contenteditable), and the mechanism (CSS selector, focus, then dispatch events). It is clear about what the tool does, though it does not explicitly differentiate it from sibling tools like focus or click.

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 that this is for editable elements and contenteditable targets, but it does not explicitly state when to use type instead of focus, click, or hover. Usage context is inferable rather than directly guided.

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