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

With no annotations, the description carries the full burden. It mentions an optional snapshot but doesn't explain how it is triggered or what happens to the session (e.g., destructiveness, reversibility, side effects). This leaves important behavioral context undisclosed.

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 sentence with clear focus. It is front-loaded and avoids unnecessary words, earning its place.

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?

Low complexity (one param) but no output schema and no annotations. The description does not explain return values, side effects, or prerequisites, and the optional snapshot is not elaborated, leaving major gaps for a tool that likely has destructive impact.

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% (session_id described as 'Session UUID'), so the baseline is 3. The description adds no extra meaning to the parameter and even references an option not represented in the schema.

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 clearly states the action ('Close a session') and the resource, and the optional snapshot persistence adds specificity. It distinguishes itself from siblings like create_session and get_session_state.

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 implies when to use it (when you want to end a session) but provides no explicit exclusions or alternatives. The optional snapshot persistence hints at a decision point but doesn't say when to choose it.

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