Open in Browser

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

The description confirms the tool opens a URL in the default browser. Without annotations, it carries the full burden and could benefit from disclosing that it does not wait for the browser, potential for multiple tabs, or error behavior, but the basic behavior is 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?

Two succinct sentences: the first states the primary action, the second gives usage context. No unnecessary words, perfectly front-loaded.

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 simplicity (one parameter, no output schema, no nested objects), the description adequately covers purpose and typical usage. Minor omission: no mention of error handling or security implications, but acceptable for a straightforward tool.

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% with a single parameter 'url' that is well-described in the schema. The description does not add new semantic information beyond what the schema already provides, so a baseline score of 3 is appropriate.

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 ('Open a URL') and the resource ('in the user's default browser'). It unequivocally distinguishes this tool from siblings, as no other sibling tool opens a browser.

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?

Provides specific scenarios for use: after deploying to show the live app or after starting the dev server. Although it does not explicitly state when not to use it or mention alternatives, the context is clear and directive.

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