stop_my_clock

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

Annotations already declare the mutation profile (readOnlyHint=false, destructiveHint=false, idempotentHint=true), so safety is covered structurally. The description adds only that the operation is scoped to the authenticated user; it does not explain behavior when no clock is running or what the idempotent no-op case looks like, so it adds modest value beyond annotations.

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 front-loaded sentence with no filler. Every word earns its place and the target scope is stated immediately.

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 zero-param mutation, the safety profile is carried by annotations and no output schema exists, so little is missing. Still, the description omits the no-clock-running case and any confirmation of what state results, leaving a small but real gap for an agent deciding whether the call is safe to issue.

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 tool takes zero parameters, so there is nothing for the description to clarify; baseline 4 applies. The description correctly reinforces that the target is implicit (authenticated user's running clock).

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 specific verb (stop) and resource (clock) scoped to the authenticated user, and 'currently running' implies it targets an active timer rather than an arbitrary one. It is distinguishable from start_my_clock and get_my_clock, though it never names them explicitly.

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 phrase 'currently running' implies the prerequisite that a clock must be active, which is useful implied usage guidance. However, there is no explicit when-to-use statement, no mention of what to do if no clock is running, and no routing guidance against the sibling start_my_clock.

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