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

No annotations are provided, so the description carries the full burden of behavioral disclosure. 'Return metadata' implies a read operation, but it says nothing about authentication requirements, rate limits, what metadata is returned, or whether the call has side effects or caching implications.

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 tight sentence with no filler, and the resource is front-loaded before the contextual clause. Nothing is wasted, though there is little content to structure.

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 read tool with no output schema, the description minimally covers what the tool does. Without annotations or an output schema, it should say more about return contents and the read-only nature to fully equip an agent.

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% and the single 'channel' parameter is documented as 'Handle, name, or ID', so the schema already carries the meaning. The description adds no further guidance on accepted identifier formats or required resolution.

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?

States a specific verb and resource ('Return metadata for a YouTube channel'), which is clearly distinguishable from the sibling job-control tools like get_job_status or cancel_job. It does not explicitly name a sibling to contrast against, but the resource is 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?

'before starting a job' implies a pre-flight context and hints at a relationship with start_channel_job, but it never states when to prefer this over list_channel_videos or start_channel_job directly, nor any exclusions. Usage is implied rather than instructed.

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