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

Annotations already declare readOnlyHint=true, openWorldHint=false, destructiveHint=false, so safety is covered. The description adds genuinely useful context beyond them: what limits get returned (age gates, restricted targeting, pre-approval) and the caveat that policy changes without notice, making the answer guidance rather than authoritative.

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?

Three sentences, front-loaded with purpose, then parameter usage, then the reliability caveat. The long category list is the only bulk and it earns its place by enumerating the covered scope.

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 read-only lookup with no output schema and fully covered parameters, the description supplies scope, scoping behavior, and a reliability caveat. It does not describe the shape of the returned limits, but with annotations covering safety and no output schema, that gap is minor.

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 parameters are documented, but the description still adds value: it specifies the omit-channel behavior (returns all channels) and that the channel slug comes from list_channels, which the schema does not state. The state and category semantics largely duplicate the schema.

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 outcome: determining whether a restricted category (alcohol, cannabis/CBD, firearms, etc.) can run on a channel and under what limits. The scope is concrete and an agent can distinguish it from siblings like list_channels or list_categories without reading the schema.

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 clearly explains how to scope a check: pass a channel slug to check one, omit it to see every channel, add a state for state-level rules. It stops short of naming when-not-to-use or pointing at a specific alternative tool beyond referencing list_channels as the slug source.

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