type

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

Discloses using Input.insertText and unicode safety, which is beyond schema. No annotations provided, so description carries the burden; adequate for a typing tool. Could be improved by mentioning if it replaces or appends text.

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?

Two concise sentences, front-loaded with main purpose. Every word earns its place without redundancy.

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?

Covers purpose, key behavior (unicode-safe, focusing), and parameters. Lacks mention of output (likely void) and potential errors, but is sufficient for a simple action tool without output schema.

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 100%, so baseline 3. Description adds marginal value by explaining selector behavior, but doesn't detail format or constraints beyond schema.

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?

Clearly states the action 'Type text into a renderer page', specifies the verb and resource, and adds context about optional focusing via selector. Distinguishes from sibling tools like click or evaluate_in_renderer.

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?

Explains when to use (typing text) and how selector works for focusing. Doesn't explicitly exclude other tools or state prerequisites, but provides sufficient context for typical use.

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