Get user stats

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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and reachability are covered. The description adds two useful facts beyond that: the data is 'precalculated' (i.e., cached/possibly stale rather than live-computed) and it is scoped to the authenticated user. It stops short of saying what the statistics contain or how fresh they are.

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?

A single short sentence with the key qualifiers ('authenticated', 'precalculated', 'watch statistics') front-loaded. No filler, nothing repeated from the title.

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 and no parameters, the description is the only place an agent can learn what comes back. 'Watch statistics' is not expanded (counts, hours, episodes, ratings?), so the agent knows the shape of the call but not the shape of the result. Adequate for invocation, thin for planning.

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 tool takes zero parameters and the description correctly implies no input is needed, matching the empty schema. Baseline 4 applies for a parameterless tool; nothing more was required.

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: retrieves the authenticated user's precalculated watch statistics. It clearly is not get_user (profile) or get_up_next (queue), but the description never names a sibling to sharpen the distinction. What counts as 'statistics' is also left generic.

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?

Usage is only implied by the phrase 'authenticated user's', which suggests it works without arguments on the calling user's own data. There is no when-to-use framing, no mention of alternatives such as get_user or get_last_activities, and no exclusions. An agent can guess but is not guided.

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