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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is fully covered by structured data. The description adds no behavioral context beyond that – nothing about pagination behavior, what 'publishing capabilities' concretely means, or scoping. With annotations carrying the load, the description contributes essentially nothing.

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 short sentence, front-loaded with the verb. There is no wasted text, though the brevity reflects under-specification rather than efficient editing.

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?

An output schema exists, so return values need not be explained, but the description still fails for a 3-parameter tool: the required brandId scope and the limit/cursor pagination contract are undocumented, and there is no routing guidance among the many related account/channel siblings.

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 0% and the description mentions no parameters at all. The required brandId, plus limit and cursor for pagination, are entirely unclarified by either the schema or the description, so the agent gets no guidance on scoping or paging.

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 verb 'List' plus resource 'connected destinations and publishing capabilities' communicates roughly what the tool returns. However, 'actual' is vague filler, and the description does nothing to distinguish it from siblings like list_ad_accounts, select_channel_accounts, or connect_channel, leaving the agent to infer which account-listing tool applies.

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?

No when-to-use guidance, no prerequisites, and no named alternatives. In a sibling set that contains connect_channel, get_channel_connection, list_ad_accounts, and select_channel_accounts, the absence of any routing hint is a real gap.

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