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

The annotations already declare destructiveHint=true and readOnlyHint=false, so safety is covered externally. The description adds useful scope by saying it clears all cookies for the current browser session, but it does not mention reversibility, auth requirements, or effects on active pages.

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, front-loaded sentence that states the action and its scope with no wasted words. It is appropriately sized for a simple browser operation.

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 low complexity, full schema coverage, and annotations that carry the destructive/open-world profile, the description is nearly sufficient for correct invocation. It could be strengthened by naming sibling alternatives, but nothing critical is missing.

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 description coverage is 100%, and the single session_id parameter is fully documented in the schema. The description adds no parameter detail beyond what the schema already provides, so the baseline 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 states a specific verb and resource: 'Clear all cookies for the current browser session.' It clearly differs from browser_get_cookies and browser_set_cookies, though it does not explicitly distinguish itself from the similarly named browser_clear_local_storage sibling.

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?

It gives no guidance about when to use this tool versus alternatives such as browser_get_cookies, browser_set_cookies, or browser_clear_local_storage. The intended use is implied only by the tool name and description text.

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