Close session

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

Annotations already declare destructiveHint=false, readOnlyHint=false, and openWorldHint=true, so safety framing is covered. The description adds that resources are freed, which hints at resource cleanup, but omits idempotency (what happens on a second close), the effect on in-flight requests, and behavior for an invalid session_id — all material for a lifecycle-mutating call.

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?

A single front-loaded sentence with zero filler. It is efficient, though its brevity reflects under-specification rather than disciplined compression.

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?

An output schema exists, so return values need no explanation. However, for a state-changing session-termination tool with annotations only carrying hint flags, the description should at least cover idempotency and error conditions to be complete; it covers neither.

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?

Only one parameter exists and the schema documents it at 100% coverage ('Session ID to close.'). The description adds no syntax, format, or origin information for session_id, so baseline 3 applies.

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?

States a specific verb and resource ('Close a session') plus a secondary effect ('free its resources'). It is distinguishable from siblings like open_request_session and list_sessions, but it never names which session types it applies to, so the boundary with browser sessions vs. request sessions is left implicit.

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 on when to close a session versus leaving it to expire, no prerequisites (e.g., that the session_id must come from open_request_session), and no mention of alternatives such as list_sessions for verifying what exists. The agent must infer the entire lifecycle context.

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