timers_stop

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

With no annotations provided, the description carries full burden for behavioral disclosure. 'Stop a specific timer' implies a mutation operation (changing timer state), but doesn't specify whether this requires special permissions, what the expected outcome is (e.g., does it return the stopped time?), whether the action is reversible, or any side effects. For a mutation tool with zero annotation coverage, this is inadequate behavioral transparency.

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 extremely concise - a single four-word sentence that gets straight to the point. There's no wasted language or unnecessary elaboration. It's front-loaded with the essential information (stop + timer).

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 mutation tool with no annotations and no output schema, the description is insufficiently complete. It doesn't explain what 'stop' means operationally (does it pause the timer? reset it to zero? mark it as completed?), what happens after invocation, or what the user should expect. Given the context of timer management in what appears to be a presentation/media control system, more detail about the timer lifecycle would be helpful.

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 description coverage is 100% with a single parameter 'timerId' fully documented in the schema. The description doesn't add any parameter information beyond what's already in the schema (which states 'The ID of the timer to stop'). This meets the baseline of 3 when schema coverage is high, but doesn't provide additional context like where to find timer IDs or format requirements.

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 'Stop a specific timer' clearly states the action (stop) and resource (timer). It's specific enough to understand the basic function, but doesn't distinguish this tool from potential siblings like 'timers_pause' or 'timers_cancel' if they existed. Among the actual sibling tools listed, there are other timer-related tools (timers_get, timers_get_all, timers_get_current, timers_increment, timers_operate_all, timers_operation, timers_reset, timers_start), so the description could be more specific about how 'stop' differs from 'pause' or 'reset'.

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 no guidance on when to use this tool versus alternatives. There's no mention of prerequisites (e.g., a timer must be running), what happens after stopping (e.g., does it reset to zero?), or when to choose this over other timer operations like 'timers_pause' or 'timers_reset'. The agent must infer usage from the tool name alone.

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