timers_create_timer

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

No annotations are provided, so the description carries the full burden. It states the basic action and the returned ID usage, but does not disclose any side effects, whether the timer starts immediately, or any prerequisites (e.g., child_id association). However, for a simple create operation, this is adequate; it does not contradict anything.

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 a single sentence with zero extraneous wording. It front-loads the primary action and includes the key piece of guidance (use the returned ID) without elaboration. Every word earns its place.

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 that an output schema exists (not shown, but present) and the parameter schema is fully described, the description sufficiently covers the tool's purpose and return usage. It does not explain every edge case but provides enough for an agent to call it correctly for its intended scenario.

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%, so both parameters (name and child_id) are already described with clear semantics. The tool description adds no additional parameter information beyond what the schema provides, so the baseline of 3 is appropriate. It does not enhance or clarify them further.

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 ('Start a new timer') and the resource (a timer). It also explains the purpose of the returned ID (for finishing feeding, sleep, pumping, or tummy time sessions), distinguishing it from timer listing/getting/updating siblings. This is specific and unambiguous.

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 this tool (starting a timer for a session type) and hints at the follow-up use of the returned ID. It does not explicitly mention alternatives (there are none for creation) or when not to use it, but the purpose is clear enough for an agent to select it appropriately.

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