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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds real behavioral context beyond that: the result set is scoped to the watch's board, or to every monitored board when the watch was created without a url. It omits any note on freshness, pagination, or result size limits.

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?

Two sentences, front-loaded with the resource and its payload, then the use case. The scoping clause is dense but earns its place by explaining an otherwise surprising result boundary. No filler.

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?

With no output schema, the description does the necessary work of describing what comes back (status plus open matching jobs) and the scope rule that governs the job list. For a read-only lookup with a one-required-param schema, that is close to sufficient; only result volume or error behavior is unaddressed.

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 50%: client_token is documented in the schema, while watch_id (a uuid) is undocumented but largely self-evident from its name. The description adds no format or semantics for either parameter, though it does implicitly tie output scope to the watch's url configuration. Minimum viable, with the schema carrying the load.

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?

States a specific verb and resource ('Get a watch') and goes further by naming the payload: the watch's status plus the jobs currently open that match its filters. That is well beyond a tautology of the title. It does not, however, explicitly differentiate itself from sibling tools like list_watches or watch_jobs, leaving the agent to infer the singular/plural distinction.

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 second sentence gives a clear use case ('answer "what is open right now" without searching or fetching careers pages yourself'), which tells the agent when this is the right call. It stops short of naming an alternative tool or a when-not-to-use condition, so it is context without routing.

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