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

The description adds useful behavioral context beyond annotations: it specifically states that the tool halts the current utterance and clears the queue, and it identifies the api_key source as signup. The 'discard' wording refers to runtime queue state, so it does not clearly contradict destructiveHint=false.

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 concise sentence plus a short parenthetical. The core behavior is front-loaded)Skip no filler and no redundant repetition of schema details.

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?

For a low-complexity control tool, the core behavior and auth requirement are covered, and annotations add idempotency and non-destructiveness. However, session_id is left underdocumentedasi and no response/error behavior is mentioned, making this only minimally complete.

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 only 50%: api_key has a schema descriptioncars, but session_id has none. The description reinforces the api_key requirement but does not explain what session_id refers to or that it must identify an active session. This leaves a significant parameter ambiguity.

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 concrete action: stop the currently-uttering sentence and discard remaining sentences in the queue. This clearly distinguishes it from siblings like speak and end_session by naming the exact resource and effect.

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 intended use is implied by the action described, but there is no explicit when-to-use guidance, no mention of alternatives, and no exclusion criteria. The only extra precondition mentioned is the api_key requirement.

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