timer_prepare

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

Annotations already declare that the operation is destructive, non-idempotent, and not read-only. The description adds only the phrase "bounded observation ticket" without explaining ticket lifetime, whether preparation can invalidate prior tickets, what side effects occur, or what "bounded" means in practice.

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 efficient sentence with the timing condition front-loaded. Its brevity is appropriate, though the undefined phrase "bounded observation ticket" reduces clarity rather than length.

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 destructive, non-idempotent tool with no output schema and an undocumented parameter, the description is too thin. It does not explain ticket lifecycle, side effects, error conditions, or how this preparation step relates to timer_attach, timer_status, or reading_start.

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?

There is one parameter, timer_id, and schema description coverage is 0%, so the description needs to explain its meaning and constraints. It only indirectly references a timer and provides no detail about the identifier's format, source, or relationship to the prepared ticket.

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 states a specific preparatory action and ties it to reading a timer through an external source. However, the core resource, "bounded observation ticket," is undefined jargon, so the tool's concrete purpose remains vague and not clearly distinguished from siblings such as timer_attach or reading_start.

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?

It gives timing guidance: use this before the caller reads a timer through an external source. It does not name alternatives, prerequisites, or when not to use it, and the relationship to adjacent timer/reading tools is left implicit.

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