Close session

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

The description indicates that the session will be closed and freed, implying irreversible termination. However, without annotations, it does not specify side effects like resource cleanup or impact on pending operations.

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 extremely concise with a single phrase. It avoids redundancy, but could be slightly more structured to include parameter hints without losing brevity.

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, readOperation is false), the description is minimally adequate but lacks details about the parameter's origin, session state requirements, or return behavior.

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 input schema has one parameter 'session' with no description, and the tool description does not elaborate on its meaning, expected format, or valid values. With 0% schema description coverage, the description fails 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 clearly states the action ('Close and free a session') with a specific verb and resource. It distinguishes itself from sibling tools like browser_new_session (create) and browser_list_sessions (list) by focusing on termination.

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?

No guidance is provided on when to use this tool versus alternatives, such as browser_attach or browser_new_session. There is no mention of prerequisite conditions or exclusions.

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