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

The readOnlyHint annotation already establishes that this is a safe read operation, and the description adds useful behavioral detail beyond that: it clarifies that time series are summarized as historyPoints counts, so an agent will not expect full underlying series that are available only via get_follower_history. This is especially valuable because there is no output schema.

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 front-loaded with the essential phrase 'Full cast of a season' and uses two efficient sentences that make it clear what is returned and when to use an alternative tool. There is no fluff or redundant explanation.

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 adequately inventories the core returned fields and explicitly flags that time series data is summarized. It could mention things like default ordering or response shape, but as a cast listing tool with well-documented parameters, the description is sufficiently complete for correct invocation.

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 with descriptions for all three parameters (show, search, status), so the tool description does not need to re-explain them. The description adds context about the returned data, but not additional meaning for the parameters themselves.

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 states a specific verb and resource: it returns the full cast of a season with concrete data fields such as per-platform follower counts, growth windows, elimination status, and Instagram milestone projections. It also differentiates itself from get_follower_history by noting that time series are merely summarized here.

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 clear context: use this tool for a season-wide cast overview with summarized metrics. It explicitly steers the agent to get_follower_history when the full time series is needed. However, it does not directly contrast with all nearby siblings like get_contestant or get_engagement, so the when-to-use guidance is good but not exhaustive.

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