tabs_create

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

No annotations are provided, so the description carries the burden of disclosing behavior. It states the action and return value, which covers the essential side effect of creating a tab, but it does not mention whether the new tab becomes active, what happens if the URL is omitted, or error behavior on invalid URLs.

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?

A single, well-structured sentence states the action, optional parameter, and return value with no wasted words. The essential information is front-loaded and immediately actionable.

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 simple tool with one optional parameter and no output schema, the description is nearly complete: it states the operation, the optional input, and the return value. Minor omissions like default behavior without a URL or focus/activation behavior are understandable gaps but not critical for basic 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 schema provides only the property name 'url' and type 'string' with 0% description coverage, so the description must compensate. It confirms that the URL is optional and clarifies its semantic role, but it does not explain default behavior when omitted or expected URL format. This adds some meaning but not comprehensive guidance.

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 uses a specific verb ('Open a new tab') and resource, clearly distinguishing it from sibling tools like tabs_activate, tabs_close, and navigate. It also states the key output ('Returns its tab id'), making the tool's purpose unambiguous.

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 clearly implies this tool is for creating a new tab, optionally with a URL, but it does not explicitly state when to prefer it over navigate, tabs_activate, or tabs_close. Usage context is present but exclusions and alternatives are left to inference.

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