timer_timer_start

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

Discloses that the tool can start or restart a stopwatch, implying it resets if already running. However, no further behavioral details are provided (e.g., impact on existing timers, error handling). With no annotations, more depth would be beneficial.

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?

Extremely concise: two sentences front-load the key action and return value. Every word contributes value with no redundancy.

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 simple one-parameter tool, the description covers the essential purpose and return format. It omits edge cases or error states, but the tool's complexity is low enough that this is acceptable.

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 single parameter 'name' has no schema description (0% coverage). The description merely calls it a 'named' stopwatch, which adds little meaning beyond the schema. No constraints or format hints are given.

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 tool's action ('Start (or restart) a named stopwatch') and explicitly mentions the return format. It effectively distinguishes itself from siblings like timer_timer_stop or timer_timer_lap.

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?

No guidance on when to use this tool versus alternatives such as timer_timer_reset or timer_timer_lap. Context within sibling tools is not leveraged to clarify use cases.

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