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

The description discloses the HTTP endpoint (GET /group_channels), which aligns with the readOnlyHint=true annotation, and explicitly states the return shape { channels[], next }. This adds useful behavioral context about pagination and read-only semantics beyond the annotation alone.

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 sentences with no filler. It front-loads the primary purpose, then adds the API endpoint and return shape, each earning 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?

With no output schema, the description compensates by stating the return shape. All 11 parameters are fully covered by the schema, and the read-only annotation covers safety. The main gap is lack of routing guidance relative to sibling tools, but this is a separate concern and the core invocation details are present.

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%, so the input schema already documents all 11 parameters thoroughly. The description adds only a high-level grouping of filters (name, members, distinct/public/super mode), which does not meaningfully enhance the parameter understanding beyond what the schema provides.

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 action ('List group channels') and the resource ('in the application'), with a specific API endpoint. It mentions rich filtering options but does not explicitly distinguish it from the sibling sendbird_list_group_channels_by_user, so it is clear but lacks sibling differentiation.

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?

There is no guidance on when to use this tool versus alternatives such as sendbird_list_group_channels_by_user or sendbird_get_group_channel. The description only states what it does, not the conditions or context that should lead an agent to select it.

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