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

Annotations only provide a title, no read-only or destructive hints. The description adds 'free its resources' but does not disclose what exactly is destroyed, whether it is reversible, or if it invalidates the session ID permanently. It also does not mention any side effects or errors.

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, concise sentence that is front-loaded with the action. No wasted words, perfectly efficient.

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?

Given the absence of annotations, description carries full burden. The tool is simple but for a mutational operation like closing a session, it should disclose irreversibility, effects on child operations, or if it throws errors. There is no output schema, so description should hint at return value or success/failure behavior. It falls short.

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 only parameter session_id has a description 'Session ID' in the schema, and schema description coverage is 100%. The description does not add any extra meaning beyond the schema. Baseline 3 is appropriate.

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) and the resource (browser session) and its purpose (free resources). It distinguishes from siblings like session_create and session_state. Could be 5 but does not explicitly mention what happens to the session (e.g., invalidates the session ID).

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 done with a session) but does not provide explicit guidelines or alternatives. It does not say when not to use it or mention related tools like session_navigate, session_create. Minimal viable guidance.

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