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

Annotations cover read-only and closed-world, but the description adds genuinely important behavior the annotations cannot convey: the tool is behind a paid 'Studio Pro' tier, it returns pricing and subscribe instructions, and critically it does NOT return the peak-hours data itself. That last disclosure prevents a costly misinterpretation of the result. It loses a point for the unexplained 'go-live reminder' phrase, which leaves unclear whether calling it registers anything on the user's behalf.

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 that carry real information, but the first is a run-on with nested parentheticals ('what the tool does (every hour of the week by viewers per live streamer, in the user's time zone, with a go-live reminder), the price and how to subscribe') that forces re-reading. The most decision-relevant fact – that no hours are returned – is buried at the end rather than front-loaded.

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 only two optional params, no output schema, and read-only annotations, the tool is simple, and the description does cover the paywall and the non-return of data. But it never clarifies what 'how to subscribe' looks like in the response, nor what the 'go-live reminder' is or whether it has a side effect, leaving gaps for a tool whose whole purpose is a paywall hand-off.

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% with both parameters fully documented, including the enum and defaults, so the baseline is 3. The description only echoes the time-zone aspect ('in the user's time zone') and says nothing about the game parameter or when to choose gta6 versus gtav.

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 does state what is returned – a description of the Studio Pro tool, its price, and subscription instructions – but it is phrased obliquely ('returns what the tool does') and directly conflicts with what the name get_best_time_to_stream implies. An agent reading the name would expect hourly best-time data; only the closing clause ('It does not return the hours themselves') corrects that, and it does not differentiate this tool from any of the listed siblings.

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?

There is no explicit when-to-use guidance, no statement of prerequisites beyond the parenthetical '(paid)', and no named alternative for an agent that actually wants the streaming-hours data. The user must infer that this is a teaser/upsell call rather than the data call.

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