close_session

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

No annotations are provided, so the description carries the full burden of disclosing behavioral traits. It only states the action itself, omitting critical details such as whether the close operation is irreversible, what happens to unsaved state, or whether it affects other sessions. This is a significant gap for a destructive-looking operation.

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 clear action statement followed by a structured Args section. Every sentence earns its place, and there is no redundant or filler content.

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 and the presence of an output schema, the description could suffice, but it lacks usage guidelines and behavioral disclosure. The existence of sibling tools like 'close_all_sessions' creates a need for differentiation that is not addressed, making the description incomplete for safe and correct use.

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 schema provides only 'session_id' as a string. The description adds meaningful context by explaining that the session ID is 'returned when the session was created', which helps agents source the correct value. This goes beyond the schema's minimal type information.

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 action ('Close a persistent browser session') with a clear resource (the session). It doesn't explicitly distinguish from the sibling 'close_all_sessions', but the name 'close_session' and the singular resource make the intent clear enough.

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 like 'list_sessions' or 'close_all_sessions'. There are no stated prerequisites, exclusions, or context for choosing this tool.

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