cast_youtube

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

The description adds no behavioral traits beyond what annotations already convey. Annotations indicate this is a non-read-only, non-idempotent, open-world operation. The verb 'Caste' merely confirms a state-changing action, but the description does not disclose side effects (e.g., stopping current playback, requiring a selected device), prerequisites, or response behavior.

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?

A single, concise sentence that front-loads the action and target. Every word contributes value: it names the operation, resource, destination, and accepted input forms. There is no padding or redundancy.

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?

For a simple one-parameter tool with no output schema, the description covers the core action and input. However, it omits any mention of prerequisites (e.g., TV must be on, a casting session must be active), side effects, or error conditions. Given the availability of sibling tools for device management, the description is adequate but not fully complete.

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 the parameter description already states accepted formats: 'URL YouTube (youtube.com/watch?v=xxx, youtu.be/xxx) ou ID de video'. The tool description repeats the 'URL or ID' idea without adding new meaning, so it meets the baseline but does not exceed it.

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: 'Caste une video YouTube sur la TV' (casts a YouTube video on the TV). It clearly distinguishes this from the sibling cast_url (which presumably handles generic URLs) by specifying 'YouTube'. The input formats (URL or ID) are also mentioned, making the tool's role unambiguous.

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?

Usage is implied: the description indicates this tool is for casting YouTube videos by URL or ID. However, it does not explicitly state when NOT to use it, nor does it reference alternatives like cast_url for non-YouTube content. The guidance is inferable but not explicit.

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