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

Without annotations, the description carries the full burden; it does convey that this is a query of current state and lists the data returned. However, it does not explicitly state that the call is read-only/non-mutating, and it omits caveats like what happens when a watch is not found or how 'recent events' is defined.

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?

One compact, front-loaded sentence with no filler. Each clause adds information about the returned state, and the length is appropriate for a tool that only requires watch_id.

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 one-parameter status query, the description names the main result groups (armed/tripped, last price, recent events, offer) and the resource, which is enough for an agent to select and invoke it. It is not quite a 5 because it leaves unstated the read-only guarantee and any error/edge-case behavior, but these are minor for this simple read tool.

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 provides only the property name watch_id with zero description coverage, so the description must compensate. It never names watch_id, but saying 'state of a watch' clarifies that the parameter identifies the watch to query; it does not explain the id format or how to obtain it.

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 identifies the resource as a watch and enumerates the returned state fields (armed/tripped, last price, recent events, best matching offer), making it easy to distinguish from sibling status tools like rental_status. It lacks an explicit verb such as 'Gets' or 'Returns,' so it is clear but not maximally explicit.

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 phrase 'current state' implies this tool is for reading watch status, but there is no explicit statement about when to prefer it over sibling tools or when not to use it. The watch-specific fields offer some context, but no alternatives or exclusions are named.

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