tv_cast

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

Without annotations, the description carries the full burden. It adds 'stv parses the platform and content ID automatically,' which is useful behavioral context. However, it does not disclose error handling, limitations (e.g., supported platforms beyond Netflix/YouTube/Spotify), or side effects (e.g., disrupting current playback).

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 two sentences, front-loaded with the key action, and adds a concise second sentence for detail. No unnecessary words. Efficient and easy to parse.

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?

Given the low complexity and presence of an output schema, the description is adequate but lacks contextual completeness. It does not mention prerequisites (e.g., network connectivity, casting support), error scenarios, or runtime behavior. More detail would help an agent invoke the tool correctly.

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 description coverage is 100%, so the baseline is 3. The description adds extra context about auto-parsing for the url parameter, but this is a minor addition. For tv_name, it echoes the schema. Overall, marginal value beyond the schema.

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 states the action: 'Cast a Netflix/YouTube/Spotify URL to the TV.' It uses a specific verb ('Cast') and identifies the resource (streaming URLs) and target (TV). This distinguishes it from sibling tools like tv_play or tv_launch, which have different purposes.

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 implies usage (cast streaming URLs) but does not explicitly state when to use this tool over alternatives. It lacks guidance on prerequisites (e.g., TV on same network) or when not to use it. No comparison to sibling tools is provided.

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