Close Session

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

The annotations already declare destructiveHint=true, so the description does not need to repeat that. It adds 'clean up resources,' which gives some context about what closing entails, but it does not specify the consequences (e.g., irreversible, invalidates session token) or prerequisites. This is adequate but not rich.

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, concise sentence that front-loads the key action ('Close the current browser session') and includes a brief supporting clause ('and clean up resources'). No wasted words.

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 zero-parameter, destructive cleanup tool, the description is complete. It states the action and the effect. Since an output schema exists, there is no need to describe return values. The simplicity of the tool means no additional context is required.

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?

With zero parameters, the schema fully covers the input. The description adds value by specifying 'current browser session,' clarifying the scope of what gets closed. Since no parameters exist to explain, the baseline of 4 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 tool's action: 'Close the current browser session' with a specific verb and resource. It is unambiguous and distinguishes itself from all sibling tools, which are about data retrieval or messaging, not session management.

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 provides no guidance on when to use this tool or when to avoid it. There are no alternatives mentioned, and no context about whether it should be called at the end of a workflow or as a cleanup step. This is a clear gap for a tool that is destructive.

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