browser_close

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

Annotations already indicate destructiveHint=true, so the description adds no new behavioral context. It does not disclose that closing a page may lose unsaved data, terminate the current session, or alter navigation history. With the destructive flag set, the description should provide more context but fails to.

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 one-line description is extremely concise, but it is under-specified rather than efficiently informative. It omits useful context like scope (current page) and consequences, making it short without earning its place through additional value.

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 destructive action with no output schema, the description should clarify what happens (closes the current tab or browser) and warn about potential data loss. This description provides none of that, leaving the agent with insufficient context to invoke the tool safely and correctly.

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 tool has zero parameters, so the schema is trivially complete. The description adds nothing about parameters, but none are needed, so a baseline score is appropriate since there is no gap to compensate.

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 'Close the page' uses a specific verb and resource, but it is vague about which page is closed (e.g., current tab) and doesn't explicitly distinguish itself from sibling tools like browser_navigate_back. It is not a tautology, but it lacks precision that would help an agent select it correctly.

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?

There is no guidance on when to use this tool versus alternatives. The description does not mention circumstances (e.g., when done with a page) or exclusions (e.g., use navigate_back to return instead). An agent must infer when closing a page is appropriate.

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