metrics_metric_timer_stop

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

With no annotations, the description carries full burden. It explains the effect (stop and record), accumulated fields, and return value. However, it does not clarify whether the timer can be restarted or side effects of stopping a non-existent timer.

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 short and front-loaded with the main action. Each sentence adds value: action, accumulated stats, return value. No wasted words.

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 low complexity and presence of an output schema, the description covers purpose, effect, and return. It could mention that the timer must be running, but overall sufficient for this simple tool.

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 0% for the only parameter timer_id, and the description does not mention or explain timer_id. The agent must infer its meaning from context. Description should explicitly state that timer_id is the ID obtained from timer_start.

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 (stop a running timer) and resource (timer), distinguishes from sibling metrics_metric_timer_start via the opposite action, and lists accumulated metrics and return value.

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 the tool is used after starting a timer, but does not explicitly state prerequisites or alternatives. The sibling name 'timer_start' provides context, but more explicit guidance would improve clarity.

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