Stop the active timer

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

Annotations indicate it's not read-only (mutating), not destructive, and idempotent. The description adds value by stating that it commits elapsed time and returns the timer state, which is beyond the annotations. No contradictions.

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 concise with zero wasted words, well-structured into sections (Args, Returns, Examples, Error Handling). Every sentence adds value.

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 only one optional parameter and no output schema, the description fully covers inputs, outputs, errors, and usage examples. It is complete for the tool's complexity.

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 100% with a clear description of response_format. The description adds meaning by noting that no arguments are needed (due to default) and provides an example, improving usability.

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 it stops the currently running timer and commits elapsed time, with a specific verb ('stop') and resource ('timer'). It distinguishes from siblings like everhour_start_timer and everhour_get_current_timer by focusing on the stopping action.

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 provides clear context for when to use (to stop a running timer) and includes error handling (404 if no timer running). It does not explicitly state when not to use or mention alternatives, but the context is sufficient for the straightforward action.

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