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

No annotations are provided, so the description carries the full burden and does disclose the return content (per-day game, next-stream instant) and that timezone rendering applies to every time. It does not state whether the schedule is static or refreshed, nor any auth/rate-limit behavior, which is a modest gap for an unannotated read tool.

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?

Three sentences, zero filler: purpose/payload first, then the answering use case, then the optional parameter's effect. Front-loaded and tight.

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 annotations, the description does the necessary work by explaining what is returned and how the single optional parameter changes the output. Minor omissions remain, notably the default timezone when omitted and any freshness guarantees.

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%, so the baseline is 3, but the description adds meaning beyond the schema by stating the effect of the timezone value: it renders 'every time in the caller's zone.' It still doesn't say what happens when the parameter is omitted, leaving the default behavior unstated.

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?

Names a specific verb ('Return') and resource ('weekly Taren Raider stream plan') and enumerates the payload: each day's game plus the exact ISO-8601 instant of the next stream. This clearly separates it from siblings like get_latest_vods, get_live_status, and get_site_info.

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?

Explicitly states the use case: 'Use this to answer when Taren streams next or what is planned for a given day.' That gives clear context, but it never names the alternative for adjacent questions (e.g., get_live_status for a current-stream check), so routing between siblings is left partly to inference.

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