close_browser

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

No annotations are provided, so the description carries the full disclosure burden. 'Close' implies termination, but it doesn't state whether the session is destroyed permanently, whether cookies/state are lost, whether the call is idempotent, or what happens to in-flight work. This is a meaningful gap for an irreversible-feeling 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?

One front-loaded sentence with zero padding. It is arguably too terse given the lack of annotations, but nothing in it is wasted.

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?

The tool has one optional parameter (required=0), no annotations, and no output schema, yet the description says nothing about what omitting sessionId does or what is returned on success or failure. For a session-terminating tool, that leaves real behavioral questions unanswered.

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 coverage is 100% and the single sessionId parameter is fully described in the schema, so the baseline is 3. The description adds nothing beyond the schema, which is acceptable given the schema does the work.

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 clear verb ('Close') and resource ('browser session'), which is unambiguous and pairs naturally with the sibling open_browser. It does not explicitly differentiate itself from siblings, but the operation is specific enough that an agent can select it correctly.

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 guidance on when to close a session versus leaving it open, no mention of cleanup semantics, and no note about what happens if the session is reused. The agent must infer usage entirely from the name.

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