close_session

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

With no annotations, the description carries the full burden. It discloses the decoder-dropping side effect, but does not mention whether the operation is destructive, irreversible, idempotent, or if it requires specific permissions. The agent is left unaware of potential data loss or error conditions.

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, compact sentence that states the core action and a key side effect. There is no filler or redundancy; every word contributes.

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 is simple, but the description is thin. It lacks context on when to close a session, what happens if the session does not exist, whether the action is reversible, and any error handling. Given the absence of an output schema and annotations, the description is not sufficient for an agent to use it safely and correctly.

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 has zero description coverage for session_id, and the description does not mention the parameter at all. No guidance is provided on the format, required context, or what constitutes a valid session ID. The description adds no value beyond 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 verb 'Close' and the resource 'a session', and adds the specific effect 'drop any decoder fitted on it', which distinguishes it from open_session and get_session_info. The purpose is unambiguous.

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 is given on when to close a session versus alternatives, nor any prerequisites or cleanup scenarios. The agent must infer that closing is a termination step, but the description offers no explicit context or exclusions.

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