get_channel_metadata

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

The description discloses the return structure in detail and notes the uploads playlist ID for further actions. This adds substantial value beyond the readOnlyHint and openWorldHint annotations, with no contradiction.

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 well-structured sentences front-load the purpose, then detail returns and usage. Every sentence earns its place without 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?

Given the tool's complexity and numerous sibling tools, the description covers the key aspects: what it returns, how to invoke it, and how to chain with another tool. The presence of an output schema further ensures completeness.

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%, so baseline is 3. The description adds clarification that channel_ids is comma-separated and handle includes '@' or plain text, improving usability beyond the schema alone.

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 tool 'fetch channel profile, statistics, and content details' with specific fields (snippet, statistics, contentDetails). It distinguishes from sibling tools like get_video_metadata by targeting channels, not videos.

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?

It explicitly mentions how to use (by channel ID or handle) and even suggests pairing with list_playlist_items for browsing videos. However, it does not explicitly state when not to use or list alternatives, though the context is clear.

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