close_browser_session

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

With no annotations, the description carries the burden of behavioral disclosure. It discloses the main side effect (closing the session and its tab) and adds the useful lifecycle fact about idle expiration. However, it does not mention behavior for invalid/expired session IDs, idempotency, or whether closing is irreversible, so the behavioral picture is only partially complete.

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 short and front-loaded: the primary action is stated first, and the expiration note follows in a second concise sentence. There is no wasted wording, though the second sentence could arguably be positioned as part of usage context rather than the main 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?

For a simple one-parameter tool with no output schema, the description covers the core action and an important lifecycle behavior. Still, it lacks guidance on prerequisites, error handling, and how the session ID is obtained, and it does not explicitly route the agent away from the sibling tool when appropriate.

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 0%, and the description does not explain what session_id represents beyond the implied 'browser session' resource. It does not say where the ID comes from, what format it has, or what happens if it is invalid. The description adds very little value beyond the schema's bare parameter name.

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 uses a specific verb ('Close') and resource ('browser session') and adds that the tab is closed too. It is clear enough to distinguish from the sibling run_browser_task, though it does not explicitly contrast itself with that tool.

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 explicit guidance on when to call this tool versus run_browser_task or when closing is unnecessary. The expiration note ('Sessions also expire after 5 minutes idle') hints that explicit closing may not always be required, but it does not give clear when-to-use or when-not-to-use guidance.

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