Close Session

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

No annotations are provided, so the description carries full responsibility for disclosing behavior. It states the action but does not mention that closing is irreversible, whether it fails on non-existent sessions, or what side effects it has on resources. For a state-changing operation, this lacks transparency.

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 sentence with zero wasted words. It is front-loaded with the action and resource, making it immediately understandable.

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?

While an output schema exists and the tool is simple, the description omits essential context such as safety profile (no annotations) and clear usage boundaries. It does not mention prerequisites, idempotency, or relationships to other session tools, leaving it incomplete for an agent deciding whether to invoke it.

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 no description for sessionId, and the tool description only repeats the parameter name ('by sessionId') without explaining its origin or format. It does not compensate for the 0% schema coverage by linking the sessionId to outputs of create_session or list_sessions.

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 explicitly identifies the input parameter ('by sessionId'). This clearly distinguishes it from sibling tools like create_session, get_session, and list_sessions.

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 versus alternatives, nor any warnings about side effects such as invalidating the session for resume_session. The only contextual clue is 'by sessionId', which implies it should be used when you have a specific session ID, but this is not explicit.

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