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

With no annotations provided, the description carries the behavioral disclosure burden. It usefully discloses credit costs, the free cache-hit behavior, and that empty results/failures are never charged. However, it does not mention auth requirements, rate limits, or explicitly state that the operation is read-only, which are relevant gaps for a tool with no annotation safety signals.

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?

The description is compact and front-loads the core purpose before moving to cost and caching details. The only structural weakness is minor ambiguity: 'isRecurring (0 credits when empty)' reads as if isRecurring itself relates to the zero-credit behavior rather than the overall empty-result billing.

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?

Despite having no output schema, the description names the returned fields and explains the important operational behaviors (cost, caching, failure billing). The parameter schema covers URL, cache, and limit semantics. The main missing piece is guidance on when to select this tool over related Twitch tools, but for a simple 3-parameter call the description is largely sufficient.

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 input schema already provides 100% coverage for all three parameters, so the description does not need to explain them in depth. It adds some value around cache semantics ('free 24h cache hit') and cost behavior, but these largely repeat or complement rather than extend the schema descriptions.

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 Twitch channel schedule and enumerates its key fields (startAt/endAt, title, game, isRecurring), which distinguishes it from sibling tools like twitch_clip, twitch_profile, and twitch_user_videos. However, it lacks an explicit verb like 'get' or 'fetch', so the purpose is clear but not stated as directly as it could be.

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 description gives practical context about credits and caching, including when to pass cache=true. It does not provide guidance on when to use this tool versus alternatives, nor does it mention exclusions or sibling tools, so an agent must infer selection purely from the resource name.

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