get_channel_info

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

With no annotations, the description carries the burden. It communicates that this is a read operation ('Get') and discloses the output fields plus accepted input forms. It does not address auth, errors, rate limits, or side effects, but for a simple metadata getter the stated behavior is reasonably complete.

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 short sentences with no redundancy: the first sentence says what data is returned, the second says how to identify the channel. This is appropriately sized and front-loaded.

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 single-parameter tool with no output schema, the description is complete: it lists the main output fields and all accepted input forms. An agent can construct the call and interpret the result without further documentation. The only minor absence is explicit handling of invalid URLs or non-existence, which is not essential for this scope.

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 schema already describes the parameter as 'YouTube channel URL, @handle, or channel ID'. The description repeats this same information without adding new semantics about format, validation, or examples, so it stays at the baseline for fully covered parameters.

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, 'Get YouTube channel information', and enumerates the returned fields. This clearly distinguishes it from siblings like get_video_metadata and get_channel_videos by indicating it is about channel-level profile data rather than video-level or listing operations.

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 when to use this tool: whenever channel information such as title, subscriber counts, and thumbnails is needed. It does not explicitly mention alternatives or when not to use it, so an agent must infer the decision from the tool name and content among the many siblings.

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