Tv Cast

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

With no annotations, the description carries the full behavioral burden. It discloses one useful trait (automatic platform/content-ID parsing), but says nothing about whether casting interrupts current playback, what happens with an unsupported URL, or whether the TV must be powered on.

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 short sentences, front-loaded with the action. The second sentence ('Paste any streaming URL') partially restates the platform list already given in sentence one, a minor redundancy but not harmful.

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?

An output schema exists, so return values need not be described, and both parameters are covered by the schema. What is missing is prerequisite state (target TV selection, current playback impact) and differentiation from the many playback siblings, which matters for a mutation-style tool with no annotations.

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% and both parameters are documented in the schema (url formats, tv_name default). The description adds no syntax or format detail beyond restating that a streaming URL is accepted, so baseline 3 applies.

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 (cast) and resource (Netflix/YouTube/Spotify URL) plus the target (TV), so the action is unambiguous. It does not distinguish itself from close siblings like tv_play or tv_launch, which an agent would likely confuse this with.

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 instruction 'Paste any streaming URL' implies the trigger condition, but there is no explicit when-to-use guidance and no mention of alternatives such as tv_play or tv_launch. Usage must be inferred from the tool name and enum-free parameter.

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